TECHNICAL MANUAL MAINTENANCE MANUAL FOR ARMY CH-47D HELICOPTER (1992)

TM 55-1520-240-10

-10 kHz, -5kHz, + lkHz is provided in both receive and

3-14. Controls and Functions VHF/FM Radio Set.

transmit mode; this frequency is not used in the ECCM

(fig. 3-6)

mode.

CONTROLS/

d. Homing.

INDICATOR

FUNCTION

(1) Mode select switch - HOM.

Function Selector

(2) Operating frequency - Set.

OFF

Primary power OFF.

Memory battery power

NOTE

ON.

Any strong single channel signal within the

TEST

RT and ECCM modules

frequency range of the radio set can be used

are tested. Results;

for homing.

GOOD or FAIL.

SQ ON

RT on with squelch.

(3) FM button on HSI MODE SELECT PANEL

- press. Check that SEL lamp is lit.

SQ OFF

RT with no squelch.,

RXMT

RT in RECEIVE mode.

(4) Homing procedures. The course deviation

Used as a radio relay link.

bar on the HSI provides the primary navigation indica-

tion when the set is in homing mode. The bar only

Keyboard loading of pre-

provides information on whether the helicopter is left,

set frequencies.

right, on a heading to the signal source, or over the

LD-V

TRANSEC variable load-

signal source. The TO-FROM ambiguity arrows will not

ing is enabled.

function and the selective course feature is not avail-

Z-A

Not an operational posi-

able. Ambiguity is solved using either of the following

tion. Used to clear the

methods:

TRANSEC variable.

(a) Directional method. When the helicopter

STOW

All power removed. Used

is heading inbound to the signal source with the bar

during extended storage.

centered, the indications are directional in that a change

in heading to the right will cause the bar to drift to the

Mode Selector

left. Conversely, a change in heading to the left will

HOM

Homing antennas are ac-

cause the bar to drift to the right. When the helicopter

tive; communication an-

is heading outbound from the signal source with the

tenna is disconnected.

vertical pointer centered, the indications are nondirec-

Provides pilot with steer-

tional in terms of steering. A change in heading to the

ing, station approach, and

right will cause the bar to drift to the right. A change in

signal strength indicators.

heading to the left will cause the bar to drift left.

(b) Build and fade method. If the signal

Single channel mode of

source is transmitting a 150-Hz tone-modulated signal

operation. Operating fre-

and the helicopter is inbound to the signal source, the

quency selected by PRE-

tone will increase in intensity. The tone will decrease in

SET selector or keyboard

intensity on an outbound heading.

entry.

(5) Additional homing characteristics. The fol-

Frequency hopping mode

lowing additional characteristics may be observed when

selected. PRESET selec-

homing. The glideslope deviation pointer will rise from

tor positions 1-6 select

the horizontal mark when the aircraft is inbound (in-

frequency hopping net

creasing signal strength) to a transmitter. The pointer

parameters.

will fall to the horizontal mark when outbound. The

FM-M

Frequency hopping-master

glideslope failure and navigation failure warning flags

position selects control

will be in view if there is inadequate homing signal

station as the time stan-

strength. A dip in the horizontal pointer may or may not

dard for communicating

occur when passing over the station, depending on the

equipment.

signal source, helicopter speed, and altitude.

Preset Selector

MAN

Used in single mode to

select any operating fre-

quency in 25 kHz incre-

ments.

3-10

TM 55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

SEND/OFST

Modify a single channel

POS. 1-6

In single channel mode,

operating frequency, man-

preset frequencies are

selected or loaded. In FH

ually select or preset, to

or FM-M mode, fre-

inclue offsets of ±5 or

±10 kHz. It has a second

quency hopping nets are

function on initiating an

selected.

ERF Transmission if a

CUE

Used by a non-ECCM

Hopset or Lockout

radio to signal to CUE or

ECCM radio.

Set is in the holding mem-

ory and the Mode Switch

IFM RF Selector

is in the FH-M position.

TIME

Used to display or change

OFF

(Bypass) - 10 watts.

the time setting maim

(Low power) - 2.5 watts,

tained within each RT.

(Normal) - 10 watts.

FILL

Used to fill ECCM pa-

NORM

rameters from an external

(High power) - 40 watts.

fill device. Entry of

ECCM parameters is initi-

ated by the H-LD button

The display generally op-

Display

erates in conjunction with

on the keyboard with the

the keyboard. Other dis-

FUNCTION switch in LD

plays may be selected by

or LD-V.

the FUNCTION and

MODE selectors.

Keyboard

A 15-button array of

switches in a 4 x 4 matrix,

used to insert data or se-

lect data for display. The

keyboard is comprised of

10 numerical buttons,

three special functions,

and two command but-

tons.

Switches 1-9

Used to key in frequen-

cies, load time informat-

ion, or offsets.

CLR

Used to zeroize the dis-

play or to clear erroneous

entries.

0 (H-LD)

Used to enter zeroes. Sec-

ond function (hold) ini-

tiates transfer of ECCM

Figure 3-6. VHF/FM Radio Set (AN/ARC-201)

parameters.

3-15. HF Radio Set (AN/ARC-HF-SSB 199).

STO/ENT

Initiate entry of all data

by keyboard entry. Its sec-

The HF radio set (AN/ARC-199) provides communica-

ond function is to store a

tion in a 28 MHz high frequency band between 2.0 to

received Hopset or Lock-

29.999 MHz. Transmit and receive frequencies are

out Set held in holding

programmable in 100 Hz steps on 20 preselectable

channels, for a total of 280,000 possible frequencies.

The operating modes of the HF radio set are Upper and

FREQ

Display the current oper-

lower sideband (USB, LSB), amplitude modulation

ating frequency during

equivalent (AME), and modulated carrier wave (MCW).

single channel (manual or

The data may be transmitted or received in LSB, USB,

preset) operation.

or AME modes. DC power to operate the HF radio set

is supplied by the No. 2 DC bus through the COMM

ARC-199 HF and PWR circuit breakers on the No. 2

PDP.

3-11

TM 55-1520-240-10

3-16. Display Fields, Controls and Function, HF

CONTROLS/

Radio Set (AN/ARC-199). (fig. 3-7)

INDICATOR

FUNCTION

CONTROLS/

VOL MIN 1, 2, 3, through

INDICATOR

FUNCTION

14, MAX.

Display Field

NOTE

Field 1

Channel - This field ap-

AUDIO VOLUME LEVEL should normally be

pears in inverse video to

set at 14. Adjust HF volume using external vol-

indicate that current

ume control on console.

channel information has

Field

S (SCAN) - Indicates

not been stored.

that the currently dis-

Field 2

Active channel number:

played channel is on

through 20

the scan list.

Field

Modulation on Mode:

Field

Indications are: XMIT,

USB, LSB, AM, CW. CW

TEST, SCAN, or

represents MCW and may

TUNE.

be used in conjunction

XMIT

Transmitter is keyed

with the mic key to trans-

and channel is tuned.

mit code.

TEST

Built-in-test (BIT)

Field 4

Receive frequency in kilo-

mode is active.

hertz

SCAN

Scan mode is active.

Field

Transmit frequency in ki-

TUNE

Tuning for one or all

lohertz,

channel - blank if not

Field 6

Squelch Level - Display

one of the above keys

MIN, 1, 2, 3, through 14,

are active.

MAX in conjunction with

Field

K (Key) - Indicates

squelch knob in control

KEY has been pressed,

panel.

and the functions above

Field 7

Receive Selective Ad-

the keys are active.

dress.

M (MODE) - Indicates

Field 8

Transmit Selective Ad-

MODE has been

dress. In the sample dis-

pressed, and USB,

play shown above, ON

LSB, AM, or CW

indicates that SELADR

should be selected next.

mode is operational for

Indicates slewing may

RX. If SELADR is opera-

be used, or scan flag

tional for TX, ON is an-

may be set or cleared.

nunciated on the line with

Controls

TX.

Function Select

Power ON/OFF, CRT

Field 9

Transmitter Output Power

brightness, audio vol-

- LOW, MED, or HI.

ume and channel num-

Field

Modulation Source. The

ber selection.

field displays are:

Function Control

Single-step, detent-type

DATA

Indicates 600 ohm data

switch, with continuous

input.

rotation in either direc-

CIPHER

Indicates input from

tion. Clockwise rotation

KY-75 input. (If in-

increases and counter-

stalled).

clockwise rotation de-

creases the CRT

CLR-VC

Indicates non-encrypted

brightness, audio vol-

KY-75 input. (If in-

ume, or channel num-

stalled).

ber. In cases of CRT

Field 11

Fault Field. Displayed

brightness and audio

fault messages are: NOT

volume, knob has no

TUNED, DATA NOT

effect once limit of that

SAVED, and AUDIO

particular function has

VOLUME LEVEL:

been reached. In

3-12

TM 55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

channel select mode,

volume control for the

function control knob is

desired level.

continuously active. That

Channel Number

Channel number may be

is, channel 20 is always

changed using the Func-

one position counterclock-

tion Select and Function

wise from channel 0.

Control Knob or by using

Squelch Control

Continuous rotation in

a combination of key-

either direction; squelch

strokes.

level is annunciated in

Modulation Mode

Four modes are available:

field #6. Once upper or

USB, LSB, AM (AME),

lower limit of squelch has

and CW (MCW). To

been reached, further op-

change from one mode to

eration of knob in same

another, press MODE +

direction has no effect.

desired mode key + ENT.

Receive Frequency

2.0-29.9999 MHz, pro-

3-17. Operating Modes/Functions, HF Radio Set

grammable in 100 Hz

(AN/ARC-199). (fig. 3-7)

steps. To change frequen-

cies press KEY + FRQ

CONTROLS/

RX + desired frequency

INDICATOR

FUNCTION

+ ENT.

Power ON/OFF

On Function Select Knob.

Transmit Frequency

2.0-29.9999 MHz pro-

Ready Indication

When the radio is initially

grammable in 100 Hz

powered on, a system

steps. To change frequen-

ready message will be dis-

cies press KEY +FRQ

played for a few seconds.

TX + desired frequency

+ ENT.

The channel 0 informa-

tion will then be dis-

Squelch Level

Single step, detent-type

played.

control; squelch level is

annunciated on the dis-

CRT Brightness

Set Function Select Knob

to BRT. Rotate the Func-

play and varies from MIN,

tion Control Knob in the

1, 2, 3 through 14, MAX.

desired direction to in-

The squelch level is not a

crease or decrease bright-

stored parameter.

ness.

Transmit Selective

A 4-letter code pro-

Address

grammed by pressing HE

Audio Volume

Set Function Knob to

VOL, rotate the Function

KEY+ SELTX + a

4-letter code + ENT, or

Control Knob in the de-

by activating SELADR

sired direction to increase

or decrease audio volume.

RX and keying the mic.

Audio volume is not a

stored parameter. Audio

Receiver Selective

A 4-letter code pro-

volume level is annunci-

Address

grammed by pressing

ated briefly in the fault

KEY + SEL RX + a

area of the display when

4-letter code + ENT. Re-

the level is being changed.

ceive selective address

The display levels are:

mode is activated by using

MIN, 1, 2, 3 through 14,

key sequence: KEY +

MAX. A secondary HF

SEL RX + ON + ENT.

audio volume control is

located in the console.

Output Power Level

Three ouptut power levels

This is provided for audio

are selectable from the

keyboard; LO, MED, or

level compatibility with

HI. The key sequence

the KY-75 (if installed).

Preset the CDU VOL

used is KEY + LO,

MED, or HI + ENT.

level to the max. position

and adjust the secondary

3-13

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

Modulation Source

Audio sources available

SCAN

Displayed channels may

are CLR-VC (clear voice),

be placed on scan list by

DATA, or encrypted au-

pressing SCAN + ON +

dio when used with voice

ENT. It can be removed

security equipment. CI-

from scan list by pressing

PHER is displayed when

SCAN + OFF + ENT.

the KY-75 is in the secure

To automatically scan

voice mode. DATA and

those channels which have

CLR-VC modes are se-

been placed on scan list,

lectable from control

press the SCAN key, then

panel, when KY-75 is in

ENT key.

non-secure mode, using

CW Keying

To utilize the CW keying

key sequence: KEY +

function, first place the

(SV-DATA or CLR-VC)

radio in CW mode. This is

+ ENT. The modulation

accomplished by pressing

source is not a stored pa-

the following key se-

rameter.

quence : MODE + CW +

Tune

By using appropriate key

ENT. Now either the

sequence, either currently

KEY key on the control

displayed channel or all

panel, or any external key

20 channels may be tuned

switch (a mic key) may be

to the antenna. The tun-

used to transmit CW.

ing information is stored

for future use with no

tuning necessary. Current

channel may be tuned by

pressing KEY + TUNE +

ENT. All 20 channels may

be tuned by pressing KEY

+ TUNE + SCAN +

ENT.

TEST

Built-in-Test (BIT) fea-

ture allows operator to

test both receiving and

transmitting capabilities at

several frequencies. Any

failure to meet predeter-

mined performance levels

results in a failure mes-

sage being

displayed. This identifies

the faulty unit and pro-

vides a maintenance code.

The test is initiated by

pressing KEY + TEST +

ENT.

STORE

ENT key, used to termi-

nate mode changes, does

not automatically store

channel information;

therefore, a store se-

quence is provided. The

key sequence is: KEY +

Figure 3-7. Control/Display Panel, HF Radio Set

STO + ENT.

(AN/ARC-HF-SSB 199)

3-18. Voice Security Equipment TSEC/KY-58.

The voice security equipment is used with the FM band

of the No. 1 VHF AM/FM radio to provide secure

3-14

TM 55-1520-240-10

two-way communication. The equipment is controlled

by the remote control unit (RCU) Z-AHP mounted on

the right side of the console. The POWER switch must

be at ON, regardless of the mode of operation, when-

ever the equipment is installed. Power to operate the

voice security system is supplied by the No. 2 DC bus

through the COMM KY-28 circuit breaker on the No. 2

PDP.

3-19. Controls and Function. (fig. 3-8)

CONTROLS/

INDICATOR

FUNCTION

Figure 3-8. Remote Control Unit TSEC/KY-58

ZEROIZE Switch

Momentary contact toggle

(Z-AHP)

(under spring-loaded

switch used to clear (ZE-

cover)

ROIZE) any crypto-net

NOTE

variables stored in the

To talk in secure voice, the KY-58 must be

TSEC/KY-58.

loaded with any number of desired variables.

DELAY Switch

Two position toggle

switch; DELAY position

(1)

Set the MODE switch to OP.

used when received signal

(2)

Set the FILL switch to the storage register

is to be retransmitted.

which contains the required CNV.

PLAIN/C/RAD1 Switch

Two position rotary switch

used to select TSEC/

(3)

Pull out and lift up the POWER switch to

KY-58 operating mode. A

ON. A beeping tone and backg0round noise

third position (C/RAD 2)

will be heard in the headset. Before the set

is covered and locked out.

can be used, the tone must be cleared by

momentarily keying the No. 1 VHF AM/FM

PLAIN

Permits normal (unse-

radio with the PTT switch.

cured) communications on

associated FM radio set.

(4)

Set the PLAIN C/RAD1 switch to C/RADl.

C/RADl

Permits secured communi-

(5)

If the signal is to be retransmitted, pull out

cations on associated FM

and lift up the DELAY switch to (ON).

radio set.

(6) Clear voice procedures: To operate in clear

FILL Switch

Six position, rotary switch,

voice (plain text) simply:

used to select any of six

storage registers for stor-

(a) Set the PLAIN-C/RAD switch to PLAIN.

age of crypto-net variable

(b) Operate the equipment.

(CNV).

Zeroizing procedures.

MODE Switch

Three position rotary

switch used to select the

NOTE

operating/loading mode of

Instructions should originate from the net

the TSEC/KY-58.

controller or commander as to when to

Allows normal operation

zeroize the equipment.

of KY-58.

Allows normal loading of

(1)

Lift the red ZEROIZE switch cover.

CNV.

(2)

Push the spring-loaded ZEROIZE switch up.

Allows remote loading of

This will zeroize positions 1-6.

CNN.

(3) Close the red cover. The equipment is now.

POWER ON

Two position toggle switch

zeroized and secure voice communications

Switch Position

used to apply power to

are no longer possible.

TSEC/KY-58.

c. Automatic remote keying procedures.

NOTE

3-20. Normal Operation.

Automatic remote keying (AK) causes an

old CNV to be replaced by a new CNV. Net

a. Operating procedures for secure voice.

controller simply transmits the new CNV

over the air to your KY-58.

3-15

TM 55-1520-240-10

(1)

The net controller will use a secure voice

applied to the KY-58 or when the KY-58 is zeroized.

channel, with directions to stand by for an

This beeping is part of normal KY-58 operation but

AK transmission. Calls should not be made

must be cleared by momentarily keying the No. 1 VHF

during this stand-by action.

AM/FM Radio before communications can be achieved.

(2)

Several beeps will be heard in the headset.

(2) Background noise indicates that the KY-58 is

This means that the old CNV is being re-

working properly. This noise should occur at power on

placed by a new CNV.

of the KY-58 and when the KY-58 is generating a

cryptovariable. If the backg0round noise is not heard at

(3)

Using this new CNV, the net controller will

power on, the equipment must be checked out by

ask for a radio check.

maintenance personnel.

(4) After the radio check is completed, the net

(3) Continuous tone should indicate a parity

controller instructions will be to resume nor-

alarm. This will occur whenever an empty storage

mal communications. No action should be

taken until the net controller requests a radio

This tone can mean any of three conditions:

check.

(a) Selection of an empty storage register.

d. Manual remote keying procedures. The net con-

troller will make contact on a secure voice channel with

(b) A bad cryptovariable is present.

instructions to stand by for a new CNV by a manual

remote keying (MK) action. Upon instructions from the

this tone, follow the loading procedures in TM 11-5810-

net controller:

262-0P. If this tone continues, have the equipment

(1)

Set the FILL switch to position 6. Notify the

checked out by maintenance personnel.

net controller by radio and stand by.

(4) Continuous tone could also indicate a crypto

(2)

When notified by the net controller, set the

alarm. If this tone occurs at any time other than in (3)

MODE switch to RV (receive variable). No-

above, equipment failure may have occurred. To clear

tify the net controller and stand by.

this tone, repeat the loading procedures in TM 11-5810-

262-0P. If this tone continues, have the equipment

(3) When notified by the net controller, set the

checked out by maintenance personnel.

FILL switch to any storage position selected

to receive the new CNV (may be unused or

(5) Single beep, when DELAY switch is down,

may contain the variable being replaced).

(not selected), can indicate any of three normal condi-

Notify the net controller and stand by.

tions:

(a) Each time the PTT button is pressed

NOTE

when the KY-58 is in C (cipher) and a filled storage

When performing step (3), the storage posi-

tion (1 through 6) selected to receive the new

(speaking) of the KY-58 is possible.

CNV may be unused or it may contain the

variable which is being replaced.

(b) When the KY-58 has successfully received

a cryptovariable, this tone indicates that a good crypto-

variable is present in the selected register.

(4)

Upon instructions from the net controller:

(a)

Listen for a beep on your headset.

sion, this tone indicates that the received signal is in

(b)

Wait two seconds.

secure voice.

(c)

Set the MODE switch to OP.

(6) A single beep, when the DELAY switch is up

(time delay) occurring after the preamble is sent, indi-

(d) Confirm.

cates that you may begin speaking.

(5)

If the MK operation was successful, the net

(7) A single beep, followed by a burst of noise

controller will now contact you via the new

and a seemingly dead condition, indicates that your

CNV.

receiver is on a different variable than the distant

(6)

If the MK operation was not successful, the

transmitter. If this tone occurs when in C/RADl: Turn

net controller will contact you via clear voice

FILL switch to the CNV, Plain-Cipher switch to PLAIN,

(plain) transmission, with instructions to set

and contact the transmitter in clear text and agree to

your FILL selector switch to position 6 and

meet on a particular variable.

stand by while the MK operation is repeated.

3-21. Voice Security Equipment TSEC/KY-75.

e. It isimportant to be familiar with certain KY-58

Voice security equipment (TSEC/KY-75), whenever

audio tones; Some tones indicate normal operation

installed, provides two-way clear or secure voice com-

while others indicate equipment malfunction. These

munication for the HF radio system (AN/ARC-199).

tones are heard only in the cipher mode and are:

Power to operate the voice security equipment is sup-

(1) Continuous beeping, with backg0round noise,

plied by the No. 2 DC bus through the KY-75 circuit

is a crypto alarm. This occurs when power is first

breaker located on the No. 2 PDP.

3-16

55-1520-240-10

3-22. Controls and Function, Voice Security

Equipment (TSEC/KY-75).

(Refer to TM 11-5810-281-OP).

3-23. Normal Operations, Voice Security Equip-

CONTROLS/

ment (TSEC/KY-75).

INDICATOR

FUNCTION

(Refer to TM 11-5810-281-OP).

Line-select (3)

Pushbutton switches to select

3-23.1. HF Radio Set (AN/ARC-220).

options displayed to left of

each switch.

The HF radio set (AN/ARC-220) provides

Brightness

(4)

Pushbutton switches to vary

communication in a 28MHz high frequency band

display brightness.

between 2.0 and 29.9999 MHz.

Channels are spaced at

100-Hz increments, giving 280,000 possible frequencies.

Channel/Net

Seven-position rotary switch

Preset channels can be manually programmed or

Selector (5)

used to select programmed

preprogrammed as part of the communications mission

operating channels or nets.

load information.

A total of 72 channels can be

Data Connector (6)

Interfaces ARC-220 system to

programmed: 20 manual simplex or half-duplex,

data transfer device for

programmable simplex or half-duplex, 20 programmable

datafill.

ALE scan lists, and 12 programmable ECCM hop-sets

Key Connector (7)

Interfaces ARC-220 system to

(with ALE capability).

Operating modes of the HF radio

data transfer device for

set using either simplex or half-duplex operation are

keyfill.

Upper and Lower sideband (USB, LSB), amplitude

modulation equivalent (AME), and continuous wave

Mode Switch (8)

Five-position rotary switch

(CW).

Data may be transmitted or received in USB or

selects mode of operation.

LSB modes. Both standard and advanced narrow-band

Selects HF conventional

digital voice terminal (ANDVT) are supported. DC

communications. Operating

power to operate the HF radio set is supplied by the No.

frequency and emission mode

2 DC bus through the COMM ARC-220 HF circuit

are selected manually.

breaker on the No. 2 PDP.

Selected information can be

stored in preset channels for

future recall.

3-23.2. Controls and Function, HF Radio Set

PRE

Selects conventional HF

(AN/ARC-220). (fig. 3-7.1)

communications. Channel/net

CONTROLS/

selector is used to select a

INDICATOR

FUNCTION

preprogrammed preset

channel. Frequency and

Cursor (1)

Four pushbutton switches

emission mode cannot be

position the cursor vertically

changed during preset

or horizontally.

operation.

Display

(2)

NVG compatible, contains six

ALE

Selects automatic link

lines. Each line holds up to 20

establishment mode of

characters. 15 characters are

operation.

left justified for

ECCM

Selects electronic counter-

communications, advisory,

countermeasure mode of

and status information.

operation.

characters are right justified

for control selection.

EMER

Used during emergency to

place a distress call. The

mode, frequency, net, etc.., is

determined by the datafill.

SQL (9)

Two pushbutton switches

which controls squelch and

audio muting.

Change

3-16.1

22-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

Fill Type

Character display (KEY,

VOL

(10)

Eight-position rotary switch

DATA) having a display

varies the receive audio output

Format - TYPE: xxxx x.

level.

Default is DATA.

Function Switch (11)

Five-position rotary switch

Contention Control

Character display (ON, OFF)

selects system operation

having a display format of -

function.

LBC: xxx. Default is OFF.

OFF

Turns the ARC-220 off.

Line 3

STBY

Selects the standby function

Receive Frequency

Numeric display (2.0 to

where built-in test (BIT),

29.9999 MHz) with a display

setup, or fill operations can be

format of: RCV xx.xxxx.

performed.

ECCM Station Type

Character display (MEMBER,

SILENT

Used in ALE or ALE ECCM

ALTERNATE, MASTER,

modes to prevent the ARC-220

NET ENTRY, ALT NET

from automatically responding

ENT). Default is MEMBER.

to incoming calls.

Lines

3,4

Character display of emission

T/R

Allows the ARC-220 to

mode (USB, LSB, AME, CW)

transmit and receive in the

one space to right of

selected mode of operation.

frequency. Default is USB.

ZERO

Erases all data (including

Line 4

datafill and keyfill) which has

Transmit Frequency

Numeric display (2.0 to

been loaded into the system

29.9999 MHz) with a format

Value

(12)

Two pushbutton switches

of: XMT xx.xxxx.

increments a field value or

Time

Numeric display (00:00:00 to

single character value,

23:59:59) with a format of -

depending on cursor position.

Hour:Minute:Second.

Line 5

3-23.3. Display Lines, HF Radio Set

(AN/ARC-220).

Link Protection Character display (OFF, ON) with a

format of - LINK PROT: xxx.

The information displayed on each line is dependent upon

Default is ON (OFF if no link

the operation being performed. This section specifies

protection datafill).

what information can be displayed on each particular

Date

Alphanumeric display (01 JAN

line.

00 to 31 DEC 99) with format

of - dd MMM yy.

CONTROLS/

Antenna Type

Character display (T/R, RCV)

INDICATOR

FUNCTION

with format of - ANT: x xx.

Line 1

Alpha-numeric display of 15

Default is T/R.

characters maximum

Line 6

containing channel title (call

Power Level

Character display (LOW,

sign). Default value -

MED, HIGH) with format of -

Mode:channel#.

PWR: xxxx, Default is

Line 2

HIGH.

ALE Address

Alpha-numeric display of 15

Squelch

Alpha-numeric display

characters maximum

(TONE, 0 to 5) with format of

containing the Call To

- SQ: xxx.

(ADRS: xxx) or Self (SELF:

xxx) Address. (ADRS:) and

Volume

Numeric display (1 to 8) with

(SELF:) labels are removed

format of - VOL: x.

for addresses greater than 10

Listen Before Talk

Character display (ON, OFF)

characters in length.

with format of - LBT: xxx.

Noise Reduction

Character display (ON, OFF)

Default value is OFF.

having a display format of -

NOISE REDUCE: xxx.

Default value is ON.

3-16.2

Change 13

55-1520-240-10

3-23.4. Operating Modes/Functions, HF Radio

CONTROLS/

Set (AN/ARC-220). (fig. 3-7.1)

INDICATOR

FUNCTION

the CURSOR

switches to

CONTROLS/

position cursor under the

INDICATOR

FUNCTION

appropriate frequency. Use

the VALUE

switches to

Power ON/OFF

On Function Switch

change frequency. (Note:

System Turn-On

Turning the Function Switch

The XMT frequency will

clock-wise from Off to STBY

automatically change with the

rns system on and selects

RCV frequency, but the

standby function.

SYSTEM

reverse is not true).

TESTING

is displayed while

Squelch Level/

Two pushbutton switches

power-up BIT (P-BIT) is in

Audio Muting

- SQL

+, when pressed

process. SYSTEM-GO

will

displays the squelch status on

be displayed if all tests good,

line 6 of display for 5 sec-

SYSTEM-NOGQ

if not.

nds. Settings are TONE

CRT Brightness

Two pushbutton switches used

and

0 through

5. TONE

to vary brightness. The

- (up

provides no muting and no

arrow) increases intensity

squelch. Position

0 provides

while the Ø (down arrow)

muting but no squelch.

decreases intensity.

Positions

1 through

5 provide

Audio Volume

Eight-position rotary switch

muting and increasing levels

varies output level. Setting is

of squelch. Muting is

displayed on line 6 (bottom) of

normally enabled during ALE

display for 5 seconds when

and ALE ECCM operation.

system first turned on or when

Output Power Level

Three output levels are

VOL

setting is changed. The

selectable for the display

display level are 1, 2, 3 thru

screen by using the

EDIT

line-

select switch, which brings up

Channel Selection

Channel number may be

the edit mode, moving the

changed using the Channel

cursor under the power

Selector seven-position rotary

character field and using the

switch. The + position of the

VALUE

switches to change

greater to be selected using the

the field. Depress the RTN

VALUE

switch.

line-select switch which stores

the change and returns to

Modulation Mode

Four modes are available:

normal operating mode. There

USB, LSB, AME, and CW.

are two Built-in-Test (BIT)

To change modes, depress the

features which concerns the

EDIT

line select switch.

operator, P-BIT and C-BIT.

While in the Edit screen use

The Power-Up Bit (P-Bit) tests

the CURSOR

switches to

the ARC-220 when initially

position cursor under the

turned on. P-Bit exercise

appropriate emission mode

basic radio control functions

(RCV or XMT). Use the

which must be operational

VALUE

switches to change

prior to entering a system

mode. (Note: The XMT

operational mode. A GO/NO-

mode will automatically

GO status appears on the

change with the RCV mode,

display and defaults to stand-

but the reverse is not true).

by mode upon completion.

Depress RTN

line select

When NO-GO status appears,

switch to enter the edited data

depressing the INOP

line-

and return to operational

select switch displays

INOP

mode.

MODES

so an operator can

Receive/Transmit

2.0 - 29.9999 MHz, program-

see if limited capability exists.

Frequency

mable in 100 Hz steps. To

The Continuous Bit (C-BIT)

change frequencies, depress

the EDIT

line select switch.

While in the Edit screen use

Change 13

3-16.3

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

automatically performed

connector on radio set control

during system operation

front panel. Use the VALUE

without any operator

right arrow switch to select

intervention. Critical system

key number

(1 through

6) to

functions are monitored. Any

be loaded. Initiate key-fill

failures cause a NO-GO

from DTD.

advisory, accompanied by the

displayed during keyfill,

portion of system which

LOAD COMPLETE

failed, to appear on line 5 of

successful, LOAD FAIL

the display. C-Bit failures are

may cause interference to

stored in nonvolatile memory.

other stations. Default is ON.

LBT: (listed before talk) -

STORE

RTN line-select key, used to

This field is used for manual,

terminate edit mode,

preset, or conventional (non-

automatically stores any

ALE) ECCM operation and

change(s) made.

turns LBT

ON or OFF.

DataFill

Contains preset frequencies,

When

OFF, transmission is

scan lists, addresses, data

accomplished without regard

messages and ALE and/or

to traffic and may cause

ECCM parameters. With

interference to other stations.

system in STBY,

press the

Default is OFF.

FILL

line-select switch. Use

ANT:

(antenna) - Useful if

VALUE

switches to select

system uses both receive-only

DATA

in the fill TYPE:

field

and transmit/receive antennas.

(line 2). Connect data transfer

When

T/R is selected, the

device (DTD) of

DATA

system transmits and receives

connector on radio set control

on same antenna. When

RCV

front panel and initiate fill

is selected, the system

from the DTD.

transmits on one and receives

displayed during datafill.

on the other antenna. Default

LOAD COMPLETE

is T/R.

displayed for a successful fill,

LINK PROT:

(link

LOAD FAIL

displayed if fill

protection) - This field turns

cannot be completed. (NOTE:

ALE link protection

ON or

using an AN/CYZ-10 DTD,

OFF. Default is ON (OFF

the radio set control displays

no link protection datafill).

DTD DETECTED

when

Press RTN

line-select switch

DTD is detected). A copy of

when setup edit is complete to

loaded datafill can be sent to

enter all data and return to

DTD by pressing

COPY

line-

STBY

screen.

select switch. COPYING

General Editing

Select desired channel and

displayed during operation,

press the EDIT

line-select

COPY COMPLETE

switch. Use the

CURSOR

displayed if successful, COPY

switches to position cursor

FAIL if copy cannot be

under character position or

completed. Press

RTN

line-

data field to be edited. Use

select switch to return to

VALUE

switches to change

STBY

screen when datafill is

the character or data field to

complete. Disconnect the

desired value. If available,

DTD.

the data setup can be modified

KeyFill

Loads secure keys. From

by pressing the DATA

line-

STBY

screen, press FILL

select switch in the EDIT

line-select switch. Use

screen, using the VALUE

VALUE

switches to select

switches to scroll through the

KEY

in fillTYPE:

field.

list of modem set

Connect DTD to

KEY

configurations. Press the

3-16.4

Change 13

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

CONTROLS/

INDICATOR

FUNCTION

be performed. If ALE data is

not loaded for the selected

RTN

line-select switch when

scan list, a CHANNEL INOP

all changes are complete to

advisory is displayed). Use -

store the changes and return to

SQL+

switch to set squelch to

normal operation mode.

TONE.

Adjust VOL

for

Transmit Position

Set function switch to

T/R

comfortable listening level.

Report

and mode switch to proper

Use -SQL+

switch to set

mode. Press the

POSN

line

squelch to

0. Headset is muted

select switch. (NOTE:

until a link is established. If

POSN

line-select is available

channel is noisy, set squelch to

only if configuration data

1. CONTROLS/

indicates GPS is installed).

Higher squelch levels are not

Manual Operation

Set function switch to

T/R and

recommended for ALE mode

mode switch to

MAN.

Use -

of operation.

SQL switch to set squelch to

Normal ALE

When ALE call is received

0. Adjust VOL

control to a

Communication

INCOMING CALL

is displ

comfortable listening level.

Receiving

ayed with the address field

Use SQL

+ switch to set

displaying caller’s ALE

squelch to

1, the optimum for

address. LINKED

is displayed

manual mode. If radio breaks

and a short gong tone sounds

in and out of squelch, increase

when an ALE link is

as required. Set to desired

established. Communication

channel. Press microphone

can now begin. Proper

PTT switch, wait until tune

protocol is for calling station

tone stops and begin

to make first transmission.

communications. When PTT

Normal ALE

Select ALE address to be

switch is pressed, the XMT

Communication

called by doing a, b, or c:

frequency is displayed.

Transmitting

a. Set channel/net switch to

Preset Operation

Set function switch to

T/R and

desired preprogrammed net.

mode switch to

PRE. Use -

b. Use VALUE

switch to

SQL switch to set squelch to

scroll through and select

0. Adjust VOL

control for

preprogrammed address.

comfortable listening level.

c. Press EDIT

line-select

Use SQL

+ switch to set

switch, then use CURSOR

squelch to position

1, the

and VALUE

switches to

optimum setting for preset

manually select an address

mode. If radio breaks in and

character-by-character.

out of squelch, increase as

(NOTE:

NET INOP

advisory

required. Set to desired

is displayed if a selected

channel. Press microphone

channel or net contains: no

PTT switch, wait until tune

data or corrupted data; or

tone stops and begin

hardware cannot support the

communications. When PTT

selected mode). Press

switch is pressed, the XMT

microphone PTT switch.

frequency is displayed.

CALLING

is displayed.

Normal ALE

Set function switch to

T/R

LINKED

is displayed with a

Communication

and mode switch to

ALE.

short gong tone and headset

(NOTE: If the selected net is

audio is restored when link

configured for link protection

established. Start

but does not have accurate

transmission. The system

time, SYNC

instead of POSN

terminates the link and returns

will appear on display, line 2

to ALE scanning after a period

right side along with an

of inactivity (30 seconds typi-

UNSYNC

advisory at bottom

cal). GPS position can also be

of screen. An ALE link

protection time sync needs to

Change

3-16.5

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

ECCM Operation -

RCVING PREAMBLE

Receiving Calls

and/or INCOMING CALL

transmitted by using the steps

displayed.

above plus the Transmit

Position Report steps.

ECCM Operation -

Press microphone PTT

Transmitting

switch. Wait for preamble

ALE Link Protection

Press PTT switch or

SYNC

Time Sync

line-select switch. System

tones to cease then begin

communications. If an

returns to scan and the net

ALE/ECCM channel is used,

default address if sync

successful, but if unsuccessful

CALLING

is displayed while

call is in process. LINKED

press ABORT

line-select

displayed and a short gong

switch to return to ALE

tone sounds, and headset audio

screen.

restored when link established.

ECCM Net

Set function switch to

T/R

(NOTE: Press

ABRT

line-

Initialization

and mode switch to

ECCM.

select switch to abort calling

(NOTE: If ECCM data or

process). Call

keys are not loaded for net

initiator should make first

selected, a CHANNEL INOP

transmission. The system

advisory is displayed). Set

terminates link and returns to

channel/net switch to desired

scan after a period of inactivi-

net. If selected channel is an

ty (30 seconds typical).

ALE/ECCM channel, the

GPS position can also be

address of station being called

transmitted by using the steps

is displayed on line two.

above plus the Transmit

(NOTE:

NET INOP

advisory

Position Report steps.

is displayed if selected channel

Data Messages

The ARC-220 radio set can

or net contains: no or

corrupted data; or hardware

store up to 10 transmit and 10

cannot support selected mode.

received data messages up to

500 characters long each.

If screen displays UNTUNED

or UNSYNC

advisories

Received data messages are

proceed with system

stored in memory and can be

Tune/Sync operation, other

retransmitted. An advisory

wise proceed with ECCM

alerts when a data message is

received. Data can be

operation.

transmitted or received in any

ECCM Tune/Sync

Press either the TUNE

line-

mode (manual, ALE, or

Operation

select switch or microphone

ECCM). Procedure to

PTT switch to initiate

send/receive (recall) messages

combined tune and sync.

is the same for all modes,

TUNING

followed by

except in manual mode when

SYNCING

is displayed during

an ALE link is not established.

process. System will return to

Data Messages -

Received messages are stored

ECCM screen without

Received

in MSG location 1. MSG 10

UNTUNED

and/or UNSYNC

is the oldest message and is

advisories if successful.

deleted from memory upon

ECCM Operation

Use -SQL switch to set

receipt of an incoming

squelch to TONE.

Adjust

message. Received messages

VOL

control for comfortable

can be read and/or forwarded,

listening level. Use SQL+

but not edited. A CHECK

switch to set squelch to

0. If

MSG

advisor is displayed

channel is noisy, set to

when data message received.

Higher settings are not

To recall data messages,

recommended for ECCM

perform the following:

operation.

3-16.6

Change 13

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

Program/Edit

Press the MSG line-select

1. Press MSG

line-select

Data Messages

switch to go to MESSAGE

switch to view message. If

operator desires to check

screen, then press PGRM

line-select switch. NO

messages even though a

MESSAGES

is displayed if

CHECK MSG

advisory was

none exists. Use the

not displayed, press MSG

CURSOR

up/down arrows to

line-select switch, then RCVD

line-select switch to view

position the cursor, then use

VALUE

switches to enter

messages. NO MESSAGES

desired data (if a previously

advisory appears if no

programmed message is to be

messages exist.

edited, use CURSOR

and

2. Use the CURSOR

up/

down arrows to view message

VALUE

switches to obtain

one line at a time and left/right

appropriate message and line

as described earlier). To

arrows to move cursor to left

delete a character in cursor

margin. Use

VALUE

position and to shift remaining

switches to page up or down.

3. To view additional

characters one position to left,

press DEL

line-select switch.

messages, use

CURSOR

A built-in word dictionary is

switches to position cursor

under the MSG number the

available (either default or

use

filled). To access word

dictionary, press WORD

line-

VALUE

switches to scroll to

select switch to obtain

next consecutive message

INSERT

screen. Use

number.

CURSOR

and VALUE

4. To retain messages in

memory, press the

RTN

line-

switches to scroll dictionary.

Place cursor under desired

select switch.

word and press

SELCT

line-

5. To delete messages,

select switch to insert a blank

position cursor under message

number to delete, press the

and the selected word at

DEL

line-select switch until

cursor position of message

edit screen or if no word

NO MESSAGES

is displayed.

found, press CANCL

line-

Press RTN

line-select switch

to return to operational mode.

select switch to return to edit

CONTROLS/screen. When

Data Messages -

Press SEND

line-select switch

complete, press

RTN

line-

Transmit

to transmit last selected

select switch to load message

address in ALE or ECCM

into memory and to return to

mode, or to transmit message

top-level screen. Shutdown

using current mode and

Procedures Set function switch

frequency in manual mode. In

to OFF. Gently pull and turn

ALE or ECCM modes

function switch to zeroize

advisories are displayed during

(ZERO)

position to erase

tuning, synching and linking

preprogrammed information,

which is done automatically.

including all fills. Zeroize

SENDING DATA

is dis-

function is operational

played while message is

regardless if system is on or

transmitted.

off.

Change 13

3-16.7

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

Ciphertext mode. Allows

Emergency

The mode used during emer-

transmission of encrypted

Communication

gencies is determined by the

voice or data and reception of

datafill. The equipment

encrypted or unencrypted

operates normally for mode

voice or data, and non-

selected. Set mode switch to

cooperative terminal rekeying.

EMER.

Press the PTT switch

Remote Keying mode.

to transmit. If in ALE mode,

Permits KY-100 to perform

an ALE call is placed to the

automatic and manual rekey

selected address.

operations.

OFFLINE

Disables communications and

gives access to the system of

menus used to select mode

settings, self-test features, and

filling the KY-100 with

crypto-variables.

Z ALL

Zeroize mode. Erases all

(PULL)

cryptographic data stored in

the KY-100 except the

Emergency Back-up Key.

CIK Receptacle

Interfaces with a

Cryptographic Ignition Key

which is needed to enable all

secure voice and data

communications.

This

function is currently

disabled.

DSPL/OFF BRT Two-function rotary switch

Figure 3-7.1. Control/Display Panel, HF Radio Set

Control

which controls the on/off

(AN/ARC-220)

status and backlight intensity

of the LCD display.

PNL/OFF BRT

Two-function rotary switch

3-23.5. Voice Security Equipment

Control

which controls the on/off

TSEC/KY-100.

status and backlight intensity

Voice security equipment (TSEC/KY-100), when in-

for the overall front panel.

stalled, provides two-way clear or secure half-duplex

PRESET Switch

Rotary selector switch which

voice/data communication for the HF radio system

controls unit operating power

(AN/ARC-220). Power to operate the TSEC/KY-100 is

and settings which are stored

supplied by the No. 2 DC bus through the HF KY-100

in memory.

circuit breaker located on the No. 2 PDP.

OFF

Removes power from KY-100.

3-23.6. Controls, Indicators, Connectors and

MAN

Manual position which allows

Function (TSEC/KY-100, Z-AVH).

operating modes to be selected

(fig 3-8.1)

using both OFFLINE and on-

CONTROLS/

line menu system,

INDICATOR

FUNCTION

1 thru 6

Six separate preset modes

MODE Switch

Six position rotary switch used

which can only be set up in the

to select one of the operational

OFFLINE mode.

modes.

FILL Connector

Used to load cryptographic

Plaintext mode. Allows

keys through the use of a

reception or transmission of

common fill device such as

unencrypted analog voice.

KYK-13/TSEC Electronic

Transfer Device, KYX-

Emergency Back-up mode.

15/TSEC Net Control Device,

Uses the emergency back-up

AN/CYZ-10 Data Transfer

key to encrypt voice for

transmission or reception.

3-16.8

Change 13

TM 55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

CONTROLS/

INDICATOR

FUNCTION

Eb Annunciator (5)

Displayed when MODE

control switch is in the

Device (DTD), or the KOI-

Emergency Backup (EB)

18/TSEC General Purpose

position.

Tape Reader.

Alphanumeric

Provides prompts, messages,

Three Button

Momentary pushbutton

Display (6)

and mode indications.

Keypad

switches active in both

OFFLINE and on-line modes.

PT Annunciator (7)

Displayed when KY-100 is

Used to enter and exit

processing plaintext voice.

submenus, activate the

Key Symbol (8)

Displayed when menu system

selected mode, select fields,

is locked.

and to scroll through menus

D Annunciator (9)

Displayed when in Data mode.

and options.

V Annunciator (10)

Displayed when in Voice

INIT

Initiate switch. In the

mode.

OFFLINE mode it activates

the displayed menu mode and

Rate Display (12)3-character display indicates voice or

provides entry into submenus.

data rate.

In on-line modes (CT, RK,

EB, PT), it selects the display

3-23.8. Turn-On Procedures.

field to be changed.

When the KY-100 is turned on, tests are automatically

up Arrow

(-)

In the OFFLINE mode, it is

performed to determine the equipment’s operating status.

Switch

used to scroll through menus

The results of these tests will be presented on the

from top to bottom. In on-line

display. Also, a CLd START

message will be

modes (CT, RK, EB, PT), it

displayed.

is used to scroll through

available options for the

a. Cold start turn-on. (Initiated if no traffic

display field being changed.

encryption key (TEK) is contained in the KY-100).

Right Arrow

(Æ) In the OFFLINE mode, it is

(1) Turn on the KY-100 by turning the PRESET

Switch

used to scroll through menus

switch to the MAN position.

from bottom to top. In the on-

line modes (CT, RK, EB, PT)

(2) The KY-100 will initiate a self-test. The display

it is used to select the display

reads CLd STRT

and then PSH INIT.

field to be changed.

Simultaneous

(-Æ)

Used to exit a submenu.

(3) Connect a fill device to the KY-100 fill

Display, LCD

Back-lighted Liquid Crystal

connector using a fill cable.

Select the fill position

Display (LCD) indicates

containing the valid key and turn it on.

operational status, operator

prompts and messages

(4) Press the INIT pushbutton (PUSH INIT).

(5) The KY-100 displays

KEY 1 01, PASS,

3-23.7. Display Annunciators/Fields

WORKING, LOCKED, READY.

(TSEC/KY-100, Z-AVH).

(fig 3-8.1)

CONTROLS/

NOTE

INDICATOR

FUNCTION

If a fill device is not connected to the KY-100

when the INIT pushbutton is pressed, a dEV

TX Annunciator (1)

Displayed when KY-100 is

ERR (Device Error) message will be displayed.

transmitting.

When this occurs, the only available

RX Annunciator (2)

Displayed when KY-100 is

communication mode will be PT (Plaintext).

receiving.

Wb Annunciator (3)

Displayed when KY-100 is in

(6) If a FAIL message is displayed, notify the next

the Wideband (VINSON)

level of maintenance.

configuration.

(7) To load additional keys (up to a total of 6),

Nb Annunciator (4)

Displayed when KY-100 is in

proceed to Key Loading Section.

the Narrowband (ANDVT)

configuration.

Change 13

3-16.9

55-1520-240-10

NOTE

b. Normal turn-on.

DO NOT

press the INITIATE pushbutton (or

pull tape through tape reader) on fill device.

(1) Set the front panel MODE control to the

OFFLINE position.

j. Press the INIT button. (When using a KOI-18 pull

tape through tape reader at a steady rate after the

(2) Rotate the DSPL and PNL switches clockwise,

terminal INIT button is pressed).

Upon completion of a

out of the OFF detent positions and adjust the display and

successful load, a pass tone will be heard and the display

panel lighting for comfortable viewing.

will momentarily indicate

KEY N,

where N is the key

location loaded.

(3) Set the PRESET switch to the MAN (manual)

position to apply power to the KY-100 electronics.

k. The display will again show

LOAD N

with N

Power-on tests will automatically be run when primary

flashing. To load additional keys, repeat steps g.

power is applied.

through j. until all desired key locations have been

loaded.

(4) Upon successful completion of the power-on

tests, the test results should appear in the display. If

1. Turn off and disconnect the fill device from the

PASS is displayed, continue with the turn-on procedures.

KY-100.

However, if a FAIL message appears in the display,

notify the next level of maintenance.

If PUSH INIT

m. Rotate MODE switch out of OFFLINE to exit Key

displayed, perform the cold start procedures as described

Load.

above in paragraph a.

3-23.10. Zeroize Procedures.

3-23.9. Key Loading Procedures.

a. Zeroize ALL keys. This procedure is active even

Key loading may be accomplished using a KYX-15,

if primary Power is removed from the KY-100.

All key

KYK-13 or a KOI-18. One Key Encryption Key (KEK),

locations within the KY-100 will be zeroized.

Once

up to six Traffic Encryption Keys (TEKs), and one

zeroized, only PT voice communications are possible

Emergency Backup (EB) key can be loaded in the KY-

until a new Traffic Encryption Key (TEK) is loaded.

100. A Fill Cable (ON190191) is required when using

one of these devices.

Proceed with the following generic

(1) Pull the MODE switch and rotate it to the

Key Loading procedures:

Z ALL position.

All keys stored in locations 1-6 and U

will be erased.

a. Place the KY-100 MODE switch in OFFLINE

position.

(2) If the KY-100 is on when this procedure is

performed, ZEROED

will be displayed, and a tone will

b. If the KY-100 is not on, turn PRESET switch to

be heard.

MAN position.

(3) If the KY-100 power is on when the MODE

c. Connect a fill device to the KY-100 fill connector.

switch is rotated out of the Z ALL position, PUSH INIT

will be displayed. Follow the COLD START

d. Push the

- (up arrow) or Æ (right arrow) button

procedures.

until KEY OPS

is displayed.

b. Zeroize SPECIFIC key locations.

e. Push the INIT button.

LOAD KEY

will be

displayed.

(1) Place the KY-100 MODE switch to the

OFFLINE position.

f. Push the INIT button.

LOAD N

with a flashing N

will be displayed. The flashing N indicates the currently

(2) If the KY-100 is not on, turn PRESET switch to

selected key location.

MAN position.

g. Press the - (up arrow) or Æ (right arrow) button

(3) Push the

- (up arrow) or (right arrow) button

until the required location (1, 2, 3, 4, 5, 6, or U) is

until KEY OPS

is displayed.

displayed.

(4) Push the INIT button.

LOAD KEY

will be

h. Press the INIT button. The entire LOAD N

displayed.

message will now be flashing.

(5) Push the

- (up arrow) or Æ (right arrow) button

i. Turn on fill device and select key to be loaded.

until ZERO

is displayed.

3-16.10

Change 13

55-1520-240-10

3-22. Controls and Function, Voice Security

Equipment (TSEC/KY-75).

(Refer to TM 11-5810-281-OP).

3-23. Normal Operations, Voice Security Equip-

CONTROLS/

ment (TSC/KY-75).

INDICATOR

FUNCTION

(Refer to TM 11-5810-281-OP).

Line-select

(3) Pushbutton switches to select

3-23.2. HF Radio Set (AN/ARC-220).

options displayed to left of

each switch.

The HF radio set (AN/ARC-220) provides

Brightness

(4)

Pushbutton switches to vary

communication in a 28MHz high frequency band

display brightness.

between 2.0 and 29.9999 MHz. Channels are spaced at

100-Hz increments, giving

280,000 posChannel/NetencieSeven-position rotary switch

Preset channels can be manually progrSelector

(5)

used to select programmed

preprogrammed as part of the communications mission

operating channels or nets.

load information. A total of 72 chaDataelConnecto

r (6Interfaces ARC-220 system to

programmed: 20 manual simplex or half-duplex, 20

data transfer device for

programmable simplex or half-duplex, 20 programmable

datafill,

ALE scan lists, and 12 programmable ECCM hop-sets

Key

Connector

(7)Interfaces ARC-220 system to

(with ALE capability). Operating modes of the HF radio

data transfer device for

set using either simplex or half-duplex operation are

keyfill.

Upper and Lower sideband (USB, LSB), amplitude

modulation equivalent (AME), and conMode Switche(8)

Five-position rotary switch

(CW). Data may be transmitted or received in USB or

selects mode of operation.

LSB modes. Both standard and advancedMANrrow-band

Selects HF conventional

digital voice terminal (ANDVT) are supported. DC

communications. Operating

power to operate the HF radio set is supplied by thefreq

uency and emission mode

2 DC bus through the COMM ARC-220 HF circuit

are selected manually.

breaker on the No. 2 PDP.

Selected information can be

stored in preset channels for

future recall.

3-23.3. Controls and Function, HF Radio Set

PRE

Selects conventional HF

(AN/ARC-220). (fig. 3-7.1)

communications. Channel/net

CONTROLS/

selector is used to select a

INDICATOR

FUNCTION

preprogrammed preset

channel. Frequency and

Cursor (1)

Four pushbutton switches

emission mode cannot be

position the cursor vertically

changed during preset

or horizontally.

operation.

Display (2)

NVG compatible, contaiALE six

Selects automatic link

lines. Each line holds up to

establishment mode of

20 characters.

15 characters

operation.

are left justified for

ECCM

Selects electronic counter-

communications, advisory,

countermeasure mode of

and status information. 5

operation.

characters are right justified

for control selection.EMER

Used during emergency to

place a distress call. The

mode, frequency, net, etc..,

determined by the datatill.

SQL

(9)

Two pushbutton switches

which controls squelch and

audio muting.

Change 12

3-17

TM 55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

VOL

(10)

Eight-position rotary switch

Fill Type

Character display (KEY,

varies the receive audio output

DATA) having a display

level.

Format - TYPE: xxxx x.

Function Switch

Five-position rotary switch

Default is DATA.

selects system operatioC

ontention ContCharacter display (ON, OFF)

function.

having a display format of -

OFF

Turns the ARC-220 off.

LBC: xxx. Default is OFF.

STBY

Selects the standby fLine 3

where built-in test (BIT),

Receive FrequenNumeric display (2.0 to

setup, or fill operations can be

29.9999 MHz) with a display

performed.

format of: RCV xx.xxxx.

SILENT

Used in ALE or ALE ECCM

ECCM Station TCharacter display (MEMBER,

modes to prevent the ARC-

ALTERNATE, MASTER,

220 from automatically

NET ENTRY, ALT NET

responding to incoming calls.

ENT). Default is MEMBER.

T/R

Allows the ARC-220 to

Lines 3,4

Character display of emissio

transmit and receive in the

mode (USB, LSB, AME,

selected mode of operation.

CW) one space to right of

ZERO

Erases all data (including

frequency. Default is USB.

datafill and keyfill) which has

Line 4

been loaded into the system

Transmit FrequeNumeric display (2.0 to

Value

(12)

Two pushbutton switches

29.9999 MHz) with a format

increments a field value or

of: XMT xx.xxxx.

single character value,

Time

Numeric display (00:00:00 to

depending on cursor position.

23:59:59) with a format of

Hour:Minute:Second.

3-23.4. Display Lines, HF Radio Set

(AN/ARC-220).

Line 5

Link Protection Character display (OFF, ON

The information displayed on each line is dependent

format of - LINK PROT: xxx

upon the operation being performed. This section

Default is ON (OFF if no li

specifies what information can be displayed on each

protection datafill).

particular line.

Date

Alphanumeric display (01

JAN 00 to 31 DEC 99) with

CONTROLS/

format of - dd MMM yy.

INDICATOR

FUNCTION

Antenna Type

Character display (T/R, RCV)

Line 1

Alpha-numeric display of 15

with format of - ANT: x xx

characters maximum

Default is T/R.

containing channel title (call

Line 6

sign). Default value -

Mode:channel#.

Power Level

Character display (LOW,

MED, HIGH) with format of

Line 2

PWR: xxxx. Default is

ALE Address

Alpha-numeric display of 15

HIGH.

characters maximum

containing the Call To

Squelch

Alpha-numeric display

(ADRS: xxx) or Self (SELF:

(TONE, 0 to 5) with format

xxx) Address. (ADRS:) and

- SQ: xxx.

(SELF:) labels are removed

Volume

Numeric display (1 to 8) wi

for addresses greater than 10

format of - VOL: x.

characters in length.

Listen Before

Character display (ON, OFF)

Noise ReductionCharacter display (ON, OFF)

with format of - LBT: xxx.

having a display format of -

Default value is OFF.

NOISE REDUCE: xxx.

Default value is ON.

3-17.1

Change

55-1520-240-10

3-23.5. Operating Modes/Functions, HF Radio

CONTROLS/

Set (AN/ARC-220). (fig

3-7.1)

INDICATOR

FUNCTION

theCURSOR

switches to

CONTROLS/

position cursor under the

INDICATOR

FUNCTION

appropriate frequency. Use

VALUE

switches to

Power ON/OFF

On Function Switch

change

frequency. (Note:

System Turn-On

Turning the Function Switch

The XMT frequency will

clock-wise from Off to STBY

automatically change with the

ms system on and selects

RCV frequency, but the

standby fu

SYSTEM

reverse is not true).

TESTING

is displayed while

Level/

Two pushbutton switches

power-up BIT (P-BIT)Squelch

Audio Muting

-SQL

+, when pressed

proce

SYSTEM-GO

will

displays the squelch status o

be displayed if all tests good,

line 6 of display for 5 sec-

SYSTEM-NOGO

if not.

nds. Setti

TONE

CRT Brightness

Two pushbutton switches used

and O throu

. TONE

to vary bright

- (up

provides no muting and no

arrow) increases intensity

squelch. P

0 provides

while

Ø (down arrow)

muting but

no squelch.

decreases intensity.

Posit

1 throu5provide

Audio Volume

Eight-position rotary switch

muting and increasing levels

varies output level. Setting is

of squelch. Muting is

displayed on line 6 (bottom) of

normally enabled during ALE

display for 5 seconds when

and ALE ECCM operation.

system first turned oOutput Power Le

Three output levels are

VOL

setting is changed. The

selectable for the display

display level are 1, 2, 3 thru

screen by usEDIT

line-select switch, which

Channel SelectionChannel number may be

brings up the edit mode,

changed using the Channel

moving the cursor under the

Selector seven-position rotary

power character field and

switch. The + position of the

using

ALUE

switches to

greater to be selected using the

change the field. Depress th

VALUE

switch.

RTN

line-select switch which

stores the change and returns

Modulation Mode Four modes are available:

to normal operating

USB, LSB, AME, and CW.

mode. There are two Built-in-

To change modes, depress the

Test (BIT) features which

EDIT

line select switch.

concerns the operator, P-BIT

While in the Edit screen use

and C-BIT. The Power-Up

theCURSOR

switches to

Bit (P-Bit) tests the ARC-22

position cursor under the

when initially turned on. P

appropriate emission mode

Bit exercise basic radio con

(RCV or XMT). Use the

trol functions which must be

VALUE

switches to change

operational prior to enterin

mode. (Note: The XMT

system operational mode. A

mode will automatically

GO/NO-GO status appears on

change with the RCV mode,

the display and defaults to

but the reverse is not true).

stand-by mode upon

Depre

RTN

line select

completion. When NO-GO

switch to enter the edited data

status appears, depressing the

and return to operational

INOP

line-select switch

mode.

displ

INOP MODES

so an

Receive/Transmit 2.0 - 29.9999 MHz, program-

operator can see if limited

Frequency

mable in 100 Hz steps. To

capability exists. The

change frequencies, depress

Continuous Bit (C-BIT) is

the EDIT line select switch.

While in the Edit screen use

Change 12

3-17.2

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

automatically performed

connector on radio set contr

during system operation

front panel.

ALUE

without any operator

right arrow switch to select

intervention. Critical system

key number (1 through 6) to

functions are monitored. Any

be loaded. Initiate keyfill

failures cause a NO-GO

from D

advisory, accompanied by the

displayed during key fill,

portion of system which

LOAD COMPLETE

failed, to appear on line 5 of

successLOAD FAIL

the display. C-Bit failures are

may cause interference to

stored in nonvolatile memory.

other stations.

LBT:

(listed before talk) -

STORE

RTN line-select key, used to

This field is used for manua

terminate edit mode,

preset, or conventional (non

automatically stores any

ALE) ECCM operation and

change(s) made.

turns

or OFF.

DataFill

Contains preset frequencies,

WhenOFF, transmission is

scan lists, addresses, data

accomplished without regard

messages and ALE and/or

to traffic and may cause

ECCM parameters. With

interference to other station

system

TBY,

press the

Defaul

OFF.

FILL

line-select switch. Use

ANT:

(antenna) - Useful if

VALUE

switches to select

system uses both receive-only

DATA

in the

PE:

field

and transmit/receive antennas

(line 2). Connect data transfer

WhenT/R is selected, the

device (DT

ATA

system transmits and receives

connector on radio set control

on same antennaRCV

front panel and initiate fill

is selected, the system

from the

OADING

transmits on one and receives

displayed

during datafill.

on the other antenna. Defaul

LOAD COMPLETE

T/R.

displayed for a successful fill,

LINK PROT:

(link

LOAD FAIL

displayed if fill

protection) - This field tur

cannot be completed.

ALE link pr

(NOTE: using an AN/CYZ-

OFF.

Defaul

ON (OFF

10 DTD, the radio set control

no link protection datafill

displ

DTD DETECTED

Pre

RTN

line-select switch

when DTD is detected). A

when setup edit is complete t

copy of loaded datafill can be

enter all data and return to

sent to DTD by pressing

STBY

screen.

COPY

line-select switch.

General Editing Select desired channel and

COPYING

is displayed

press

DIT

line-select

during ope

COPY

switch. U

CURSOR

COMPLETE

displayed if

switches to position cursor

successCOPY FAIL

under character position or

copy cannot be completed.

data field to be edited. Use

pre

RTN

line-select switch

VALUE

switches to change

to retuSTBY

screen

the character or data field

when datafill is complete.

desired value. If available

Disconnect the DTD.

the data setup can be modifie

KeyFill

Loads secure keys. From

by pressi

DATA

line-

STBY

screen,

FILL

select switch in the EDIT

line-select

switch. Use

screen, us

VALUE

switches to select

switches to scroll through t

KEY

TYPE:

field.

list of modem set

Connect DT

configurations. Press the

3-17.3

Change

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

CONTROLS/

INDICATOR

FUNCTION

be performed. If ALE data i

not loaded for the selected

RTN

line-select switch when

scan l

CHANNEL INOP

all changes are complete to

advisory is displayed). Use

store the changes and return to

SQL+

switch to set squelch

normal operation mode.

toONE.

AdjuVOL

for

Transmit PositioSet function

T/R

comfortable listening level.

Report

and mode switch to proper

Use -SQL+ switch to set

mode. presPOSN

line

squelch

. Headset is muted

select switch. (NOTE:

until a link is established

POSN

line-select is available

channel is noisy, set squelch

only if configuration data

to1. CONTROLS/

indicates GPS is installed).

Higher squelch levels are not

Manual Operation

Set function

T/R and

recommended for ALE mode

mode swit

MAN.

Use -

of operation.

SQL

switch to set squelch to

Normal ALE

When ALE call is received

0. AdjuVOL

control to a

Communication

INCOMING CALL

is displ

comfortable listening level.

Receiving

ayed with the address field

UseSQL

+ switch to set

displaying caller’s ALE

squelch,the optimum for

addre

LINKED

manual mode. If radio breaks

displayed and a short gong

in and out of squelch, increase

tone sounds when an ALE link

as required. Set to desired

is established. Communication

channel. Press microphone

can now begin. Proper

PTT switch, wait until tune

protocol is for calling stat

tone stops and begin

to make first transmission.

communications. When PTT

Normal ALE

Select ALE address to be

switch is pre

XMT

Communication

called by doing a, b, or c:

frequency is

displayed.

Transmitting

a. Set channel/net switch to

Preset OperationSet function

T/R and

desired preprogrammed net.

mode swit

PRE.

Use -

b. U

VALUE

switch to

SQL

switch to set squelch to

scroll through and select

0. AdjuVOL

control for

preprogrammed address.

comfortable listening level.

c. PrEDIT

line-select

UseSQL

+ switch to set

switch, th

CURSOR

squelch to

1, the

andVALUE

switches to

optimum setting for preset

manually select an address

mode. If radio breaks in and

character-by-character.

out of squelch. increase as

(NOTEN ET INOP

advisory

required. Set to desired

is displayed if a selected

channel. Press microphone

channel or net contains: no

PTT switch, wait until tune

data or corrupted data; or

tone stops and begin

hardware cannot support the

communications. When PTlT

selected mode). Press

switch is pre

XMT

microph

PTT

switch.

frequency is

displayed.

CALLING

is displayed.

Normal ALE

Set function

T/R

LINKED

is displayed with a

Communication

and mode swi

LE.

short gong tone and headset

(NOTE: If the selected net is

audio is restored when link

configured for link protection

established. Start

but does not have accurate

transmission. The system

tim

SYNC

instea

POSN

terminates the link and retur

will appear on display, line 2

to ALE scanning after a

right side along with an

period of inactivity (30

UNSYNC

advisory at bottom

seconds typical). GPS

of screen. An ALE link

position can also be

protection time sync needs to

Change

3-17.4

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

CONTROLS/

INDICATOR

FUNCTION

ECCM Operation -

RCVING PREAMBLE

Receiving Calls and/

INCOMING CALL

transmitted by using the steps

is displayed.

above plus the Transmit

Position Report steps.

ECCM Operation -

Press microphone PTT

Transmitting

switch. Wait for preamble

ALE Link ProtecPress PTT switch or SYNC

tones to cease then begin

Time Sync

line-select switch. System

communications. If an

returns to scan and the net

ALE/ECCM channel is used,

default address if sync

CALLING

is displayed while

successful, but if unsuccessful

call is in

LINKED

presABORT

line-select

displayed and a short gong

switch to return to ALE

tone sounds, and headset audi

screen.

restored when link establish

ECCM Net

Set function

T/R

(NOTE: P

ABRT

line-

Initialization

and mode swi

CCM.

select switch to abort calli

(NOTE: If ECCM data or

process). Call

keys are not loaded for net

initiator should make first

selecte

CHANNEL INOP

transmission. The system

advisory is displayed). Set

terminates link and returns

channel/net switch to desired

scan after a period of inact

net. If selected channel is an

ty (30 seconds typical).

ALE/ECCM channel, the

GPS position can also be

address of station being called

transmitted by using the ste

is displayed on line two.

above plus the Transmit

(NOTEN ET INOP

advisory

Position Report steps.

is displayed if selected channel

Data Messages

The ARC-220 radio set can

or net contains: no or

store up to 10 transmit and

corrupted data; or hardware

received data messages up to

cannot support selected mode.

500 characters long each.

If screen displays

Received data messages are

UNTUNED

orUNSYNC

stored in memory and can be

advisories proceed with

retransmitted. An advisory

system Tune/Sync operation,

alerts when a data message is

other wise proceed with

received. Data can be

ECCM operation.

transmitted or received in a

ECCM Tune/Sync

Press eit

TUNE

line-

mode (manual, ALE. or

Operation

select switch

or microphone

ECCM). Procedure to

PTT switch to initiate

send/receive (recall) message

combined tune and sync.

is the same for all modes,

TUNING

followed by

except in manual mode when

SYNCING

is displayed during

an ALE link is not establish

process. System will return to

Data Messages - Received messages are stored

ECCM screen without

Received

in MSG location 1. MSG 10

UNTUNED

and/

UNSYNC

is the oldest message and is

advisories if successful.

deleted from memory upon

ECCM Operation UseSQL

switch to set

receipt of an incoming

squelch

ONE.

Adjust

message. Received messages

VOL

control for comfortable

can be read and/or forwarded

listening l

SQL+

but not ed

CHECK

switch to set

0. If

MSG

advisor is displayed

channel is no

when data message received.

Higher settings are not

To recall data messages,

recommended for ECCM

perform the following:

operation.

3-17.5

Change 12

55-1520-240-10

INDICATOR

FUNCTION

CONTROLS/

Program/Edit

Press

MSG

line-select

INDICATOR

FUNCTION

Data Messages

switch to

ESSAGE

1. Pr

MSG

line-select

screen, then

GRM

switch to view message. If

line-select

MESSAGES

is displayed if

operator desires to check

none exists. Use the

messages even though a

CHECK MSG

advisory was

CURSOR

up/down arrows to

position the cursor, then use

not displaye

MSG

VALUE

switches to enter

line-select swRCVD

desired data (if a previously

line-select switch to view

programmed message is to be

messageNO MESSAGES

edited,

URSOR

and

advisory appears if no

VALUE

switches to obtain

messages exist.

appropriate message and line

2. Use

CURSOR

up/

as described earlier). To

down arrows to view message

delete a character in cursor

one line at a time and

position and to shift remainin

left/right arrows to move

characters one position to left

cursor to left margin. Use

pre

DEL

line-select switch.

VALUE

switches to page up

A built-in word dictionary i

or down.

available (either default or

3. To view additional

filled). To access word

messages,

CURSOR

switches to position cursor

dictionary,

line-

select switch to obtain

under the MSG number the

INSERT

screen. Use

use

VALUE

switches to scroll to

CURSOR

andVALUE

switches to scroll dictionary.

consecutive message

Place cursor under desired

number.

word and

SELCT

line-

4. To retain messages in

select switch to insert a blank

memory, pre

RTN

line-

and the selected word at

select switch.

cursor position of message

5. To delete messages,

edit screen or if no word

position cursor under message

found,

CANCL

line-

number to delete, press the

select switch to return to edi

DEL

line-select switch until

CONTROLS/screen. When

NO MESSAGES

is displayed.

complete,

RTN

line-

Pre

RTN

line-select switch

select switch to load message

to return to operational mode.

into memory and to return to

Data Messages -

Pres

SEND

line-select switch

top-level screen. Shutdown

Transmit

to transmit last selected

Procedures Set function switch

address in ALE or ECCM

Gently pull and turn

mode, or to transmit message

function switch to zeroize

using current mode and

(ZERO)

position to erase

frequency in manual mode. In

preprogrammed information,

ALE or ECCM modes

including all fills. Zeroize

advisories are displayed

function is operational

during tuning, synching and

regardless if system is on or

linking which is done

off.

automati

SENDING

DATA

is dis-played while

message is transmitted.

CONTROLS/

Change

3-17.6

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

Ciphertext mode. Allows

Emergency

The mode used during emer-

transmission of encrypted

Communication

gencies is determined by the

voice or data and reception

datafill. The equipment

encrypted or unencrypted

operates normally for mode

voice or data, and non-

selected. Set mode switch to

cooperative terminal rekeyin

EMER.

Press the PTT switch

Remote Keying mode.

to transmit. If in ALE mode,

Permits KY-100 to perform

an ALE call is placed to the

automatic and manual rekey

selected address.

operations.

OFFLINE

Disables communications and

gives access to the system of

menus used to select mode

settings, self-test features,

filling the KY-100 with

crypto-variables.

Z ALL

Zeroize mode. Erases all

(PULL)

cryptographic data stored in

the KY - 100 except the

Emergency Back-up Key.

CIK Receptacle

Interfaces with a

Cryptographic Ignition Key

which is needed to enable all

secure voice and data

communicati

his

function is currently

disabled.

DSPL/OFF BRT

Two-function rotary switch

Figure 3-7.1.

Control/Display Panel, HF Radio Set

Control

which controls the on/off

(AN/ARC-220)

status and backlight intensit

of the LCD display.

Two-function rotary switch

PNL/OFF BRT

3-23.6. Voice Security Equipment

Control

which controls the on/off

TSEC/KY-100.

status and backlight intensit

Voice security equipment (TSEC/KY-100), when in-

for the overall front panel.

stalled, provides two-way clear or secure half-duplex

PRESET Switch

Rotary selector switch which

voice/data communication for the HF radio system

controls unit operating powe

(AN/ARC-220). Power to operate the TSEC/KY-100 is

and settings which are stored

supplied by the No. 2 DC bus through the HF KY- 100

in memory.

circuit breaker located on the No. 2 PDP.

OFF

Removes power from KY-

100.

3-23.7. Controls, Indicators, Connectors and

Function (TSEC/KY-100, Z-AVH).

MAN

Manual position which allows

(fig 3-8.1)

operating modes to be selected

using both OFFLINE and on-

CONTROLS/

line menu system.

INDICATOR

FUNCTION

Six separate preset modes

MODE Switch

Six position rotary sw1 thru 6d

which can only be set up in

to select one of the operational

modes.

the OFFLINE mode.

Plaintext mode. AlloFILL Connector Used to load cryptographic

keys through the use of a

reception or transmission of

common fill device such as

unencrypted analog voice.

KYK-13/TSEC Electronic

Emergency Back-up mode.

Transfer Device, KYX-

Uses the emergency back-up

15/TSEC Net Control Device,

key to encrypt voice for

AN/CYZ-10 Data Transfer

transmission or reception.

3-17.7

Change 12

55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

CONTROLS/

INDICATOR

FUNCTION

Eb Annunciator Displayed when MODE

control switch is in the

Device (DTD), or the KOI-

Emergency Backup (EB)

18/TSEC General Purpose

position.

Tape Reader.

Alphanumeric

Provides prompts, messages,

Three Button

Momentary pushbutton

Display (6)

and mode indications.

Keypad

switches active in both

OFFLINE and on-line PT Annunciator Displayed when KY-100 is

Used to enter and exit

processing plaintext voice.

submenus. activate the

Key Symbol (8)

Displayed when menu system

selected mode, select fields,

is locked.

and to scroll through menus

D Annunciator (Displayed when in Data mode.

and options.

V Annunciator (Displayed when in Voice

INIT

Initiate switch. In the

mode.

OFFLINE mode it activates

the displayed menu modRatedisplay (12)3-character display indicate

provides entry into submenus.

data rate.

In on-line modes (CT, RK,

EB. PT), it selects t3-23.9.Turn-OnProcedures.

field to be changed.

When the KY-100 is turned on, tests are auto

Up Arrow (t) In the OFFLINE mode,performed to determine the equipment’s operati

Switch

used to scroll throughThe results of these tests will be presented o

from top to bottom.display. AC

Ldso, a

message will be

modes (CT, RK, EB, Pdisplayed.

is used to scroll through

available options for a.

Cold start turn-on. (Initiated if no

display field being cencryption key (TEK) is contained in the KY-

Right Arrow (+)In the OFFLINE mode, it is

(1) Turn on the KY-100 by turning the PRE

Switch

used to scroll through menus

switch to the MAN position.

from bottom to top. In the

on-line modes (CT, RK, EB,

(2) The KY-100 will initiate a self-tes

PT) it is used to select the

display reads CM STRT and then PSH INIT.

display field to be changed.

Simullan

(-Æ)

Used to exit a submenu.

(3) Connect a fill device to the KY-100

tor using a fill cable. Select the fil

Display, LCD

Back-lighted Liquid connec

ntaining the valid key and turn it on.

Display (LCD) indicaco

operational status, operator

(4) Press the INIT pushbutton (PUSH INIT)

prompts and messages

(5) The KY-100

KEY

01, PASS,

3-23.8. Display Annunciators/Fields

WORKING, LOCKED, READY.

(TSEC/KY-100, Z-AVH). (fig 3-8.2)

NOTE

CONTROLS/

INDICATOR

FUNCTION

If a fill device is not connected to the

when the INIT pushbutton is pressed, a dEV

TX AnnunciatorDisplayed when KY-100 is

ERR (Device Error) message will be display

transmitting.

When this occurs, the only available

RX Annunciator Displayed when KY-100 icommunication mode will be PT (Plaintext)

receiving.

If a FAIL message is displayed, notif

Wb Annunciator

Displayed when KY-100 i(6)

level of maintenance.

the Wideband (VINSON)

configuration.

(7) To load additional keys (up to a tota

Nb Annunciator

Displayed when KY-100 is in

proceed to Key Loading Section.

the Narrowband (ANDVT)

configuration.

Change

3-17.8

TM 55-1520-240-10

NOTE

b. Normal turn-on.

DO NOT press the INITIATE pushbutton (or

pull tape through tape reader) on fill de

(1) Set the front panel MODE control to the

OFFLINE position.

j. Press the INIT button. (When using a

tape through tape reader at a steady rate afte

(2) Rotate the DSPL and PNL switcterminal INIT,button is pressed). Upon comp

out of the OFF detent positions and asuccessful load, a

pass tone will be heard an

and panel lighting for comfortable play will momenta

KEY N,

where N is the

key location loaded.

(3) Set the PRESET switch to the MAN (manual)

position to apply power to the KY-100k. The display wil

OAD N

with N

Power-on tests will automatically beflashing. To load

additional keys, repeat s

power is applied.

through j. until all desired key locations h

loaded.

(4) Upon successful completion of the power-on

tests, the test results should appear1. Turn off and disconnect the till device

PASS

is displayed, continue with theKY-100.

procedures. However, if a FAIL message appears in the

display, notify the next lev

PUSH

m. Rotate MODE switch out of OFFLINE to

INIT

is displayed, perform the cold sLoad.procedures as

described above in paragraph a.

3-23.11. Zeroize Procedures.

3-23.10. Key Loading Procedures.

a. Zeroize ALL keys. This procedure is a

Key loading may be accomplished usinif primary

Power is removed from the KY-1

KYK-13 or a KOI-18. One Key Encryplocations within the KY-100 will be zeroize

up to six Traffic Encryption Keys (Tzeroized, only PT voice communications are

Emergency Backup (EB) key can be loauntil a new Traffic Encryption Key (TEK)

100. A Fill Cable (ON190191) is required when using

one of these devices. Proceed with the(1) Pull the MODE

switch and rotate it to

Key Loading procedures:

Z ALL position. All keys stored in locati

will be erased.

a. Place the KY-100 MODE switch in OFFLINE

position.

(2) If the KY-100 is on when this proced

perform

EROED

will be displayed, and a tone

b. If the KY-100 is not on, turn PRbe heard.ch to

MAN position.

(3) If the KY-100 power is on when the M

c. Connect a fill device to the KYswitch is rotated out of the Z ALL positi

will be displayed. Follow the COLD START

d. Push

(up arro

Æ (right arrow) buprocedures.

KEY OPS

is displayed.

b. Zeroize SPECIFIC key locations.

e. Push the IN

LOAD KEY

will be

displayed.

(1) Place the KY-100 MODE switch to the

OFFLINE position.

f. Push the INLOAD N

with a flashing N

will be displayed. The flashing N indic(2) If the KY-100ys not on, turn PRESET

selected key location.

to MAN position.

g. Press(up arroÆ)(right arrow) butto(3) Push(up arrow) or (right arrow) bu

until the required location (1, 2, 3,EY OPS 5,is displayed

unt

displayed.

(4) Push the INLOAD KEY

will be

h. Press the INIT button. The entdisplayed.

message will now be flashing.

(5) Push(up arroÆ)(right arrow)

i. Turn on fill device and select

button

ERO

is displayed.

3-17.9

Change

55-1520-240-10

i. PresÆ

(right arrow) button. The Key fi

(6) Push the IN

ERO N

with a flaswill

be flashing.

N will be displayed. The flashing N indicates the

currently selected key location to bej. Pres- (up

arrow) button until the desired

location (1, 2, 3, 4, 5, or 6) is flashing

(7) Pres

- (up arroÆ)(right arrow)

button until the required location (1, 2, 3, 4(right arrow)

k. PressÆ

button. The Data Ra

is displayed.

field will be flashing.

(8) Press the INIT but

ZERO N

1. Press

(up arrow) button until the desired

message will now be flashing.

Rate (300, 600, 1.2K, or 2.4K) is flashing.

(9) Press the INIT button. The dism. After all fields have been set properly:

while the key zeroize process is beiINIT button to save the settings and return

completion of a successful key zeroiOperations.s tone

will be heard and the display will briefly indicate

ZEROED N,

where N is the key location

3-23.13. Cipher/Plain Text Level Modification.

The following procedures are used to modify

(10) To zeroize additional keys,Cipher Text Level Receive Plain Text Level,

display in

ZERO N

(with N flashing), tCT/PT or Cipher Text Only menus.

steps 7 through 9.

a. Place the KY-100 MODE switch to the CT

(11) Rotate MODE switch out of OFFLINE to exit

b. Rotate the KY-100 PRESET switch to the

Key Load.

position.

c. To modify the Receive Ciphertext Volume,

3-23.12. Online Mode Selection Menu.

This

step d, to modify the CT/PT or Ciphertext On

procedure is used to modify the Online MODE configu-

go to step i, and to modify the Receive Plai

ration.

Volume, go to step n.

a. Place the KY-100 MODE switch to the CT

position.

d. Push

(up arro

Æ (right arrow) button

unt

XCTV N

(where N represents the current re

b. Rotate the KY-100 PRESET switch to the MAN

level) is displayed.

position. If the PRESET switch is in position 1, 2, 3, 4,

5, or 6, the MODE selections cannot be modified. Refer

e. Push the INIT button. The N in RXCTV

to the section on changing PRESET settings to modify

begin to flash.

the PRESET ‘configuration.

f. Push

(up arro

Æ (right arrow) button

c. Press the INIT button. The WB (Wide Band) or

until the desired receive level is displayed

NB (Narrow Band) (which ever mode is active)

enunciator will begin flashing.

g. Push the INIT button. The N in RXCTV

NOTE

stop flashing.

The KY-100 will be operated in Narrow Band

h. Push

(up arro

Æ (right arrow) button

mode only with the ARC-220 Radio Set.

until the Operating Mode is displayed. This

the Receive Ciphertext Volume adjustment.

d. Press(up arrow) button until the desired

enunciator (WB or NB) is flashing.

i. Push

(up arro

Æ (right arrow) button

CT or CT ONLY

is displayed.

e. Pres

Æ (right arrow) button. The Mode field

will be flashing.

j. Push the INIT button. The CT or CT ON

begin to flash.

f. Pres- (up arrow) button until the desired Mode

setting (CT or PT) is flashing.

k. Push

(up arro

Æ (right arrow) button

until CT (Ciphertext and Plaintext operation

g. PressÆ

(right arrow) button. The Modem

LY (Ciphertext only operation) is displayed.

field will be flashing.

1. Push the INlT button. The CT or CT ON

stop flashing.

h. PressÆ(up arrow) button until the desired

Modem setting (HF, LOS, or bd) is flashing.

Change

3-17.10

55-1520-240-10

f. Pull the MODE switch and rotate it to t

m. Push

(up arroÆ)

right arrow) bposition.

until the Operating Mode is displayed. This completes

the CT/PT or CT Only setting.

g. Follow the COLD START Procedures.

n. Push

(up arro

Æ (right arrow) butth.

If the KY-100 does not display a FAIL mes

unt

XPTV N

(where N represents the curafter self test: Return to normal operation.

level) is displayed.

i. If the KY-100 does display a FAIL message

o. Push the INIT button. The N inself test: Notify maintenance.

begin to flash.

3-23.16. Off-Line Tests.

The off line TEST menu

p. Push

(up arro

Æ (right arrow) buconsist of automatic (AUTO) tests, user-selecta

ests and software version (VERSION) c

until the desired receive level is d(USER) t

procedures.

q. Push the INIT button. The N in a. Preliminary.

stop flashing.

r. Push(up arroÆ)

right arrow) butt(1) Set the KY-100 MODE control to the OF

until the Operating Mode is displayeposition.completes

the Receive Plaintext Volume adjustment.

(2) The display

TEST

which is the

3-23.14. Standard Operation,

These procedures

first OFFLINE menu.

describe normal transmit/receive operation for cipher

text and plaintext voice messages.

(3) Press the INIT pushbutton to access the

submenus.

a. Rotate the KY-100 PRESET switch to MAN (for

manual selection) or the desir

b. For

(4) Pres

- (up arro

Æ (right arrow)

ciphertext operation: Place the MODE switch in CT.

ton until the desired sub-menu option

Ciphertext messages can now be transmipushbut

yed.

received. If the CT, CT ONLY menu USER) is displa

plaintext messages can also be received. When

raph b, c or d as applic

transmitting in ciphertext, the TX and(5) Proceed to parag

be lit. When receiving a ciphertext message, the RX and

V enunciators will be lit. When receb. Automatic (AUTO) Tests.

message, the PT enunciator will be lit.

(1) With AUTO displayed, press the INIT

t the automatic tests.

c. For plaintext operation: Place tpushbutton to star

PT. The CT, CT ONLY menu must be set for CT to

usion of the automatic test

be able to transmit or receive plaintex(2) At the concl

ed in the display.

transmitting in plaintext. the TX eresults will be present

When receiving a plaintext message, the RX and PT

(3) If the automatic tes

ASS

will

enunciators will be lit.

be displayed and a pass tone will be heard. N

y will

SER

which is the next sub-menu.

3-23.15. Troubleshooting.

Follow these procdispla

rm the USER tests, proceed to paragra

if the KY-100 displays a FAIL messagTo perfo

equipment configuration or operation.

exit. rotate the MODE control switch out of t

LINE position.

a. Rotate the KY-100 PRESET switch to the PWR

OFF position.

(4) If a failure is detected during the au

tests, a FAIL message will be displayed.

b. Place the MODE switch in the OFFLINE position.

c. User Tests.

c. Rotate the PRESET switch to MAN.

(1) WUSER

displayed, press the INIT

d. If the KY-100 does not display a FAIL message

pushbutton to start the user tests.

after self test: Return to normal operation.

e. If the KY-100 does display a FAIL message after

self test: Rotate the PRESET to the PWR OFF position.

3-17.11

Change 12

55-1520-240-10

(2PT LOOP

will be momentarily display(14)oSet the MODE control switch to RK.

indicate that a plaintext loopback tdisplayed.e performed.

Next,

prompt is displayed.

(15) Set the MODE control switch to OFFL

(3) Depress and hold the PTT switEbhis displayed

TALK

prompt displayed, speak into the microphone.

Looped back plaintext voice will be hea(16) Set the MODE controlRESET

receiver.

will be momentarily displayed, followed by

(4) Release the PTT switch.

(17) Set the PRESET switch to MAN. A ‘

CT LOOP

will be momentarily dispdisplayed.

indicating that the KY-100 is in the cipher text loopback

mode. Ne

PTIT

operator prompt is displaye(18) Set the PRESET switch to 1. A ‘2’

displayed.

(6) Press and hold the PTT switch and, with a

TALK

prompt displayed, speak into the m(19) Set

the PRESET switch to 2. A ‘3’

until

ALK

prompt disappears (approximdisplayed.

seconds).

(20) Set the PRESET sA ‘4’ is

(7) Release the PTT

LISTEN

prompt

displayed.

is displayed. Listen to synthesized speech at the

receiver. Upon completion of the speech(21) Set the PRESET sA ‘5’ is

observe

PANEL

is displayed.

displayed.

NOTE

(22) Set the PRESET switch to 5. A ‘6’

displayed.

To exit and skip remaining USER tests, press

- (up arro

Æ (right arrow) pushbutton

(23) Set the PRESET switch to 6. A pass t

switch within 5 seconds.

be heard indicating that the panel test was c

successfully.

(8) Within 5 seconds after completion of the CT

loopback test, observe that all liquid crystal display

(24) Upon completion of the USER tests, t

(LCD) segments are on. At completion of the display

will sequence to

Exit the user test mode at

test a mom

INIT operator prompt is displayed

this time by rotating the MODE control switc

indicating the start of front panel switch test.

OFFLINE position.

NOTE

Failure to perform any of the panel pushbutton

and switch prompts within 30 seconds will

result in a fail tone and the display will indicate

FAIL FP

(Front Panel).

(9) Press the INIT push

A Æ (right

arrow) is displayed.

(10) PresÆ

(right arrow) pushbutton switch.

An (up arrow) is displayed.

(11) Pres(

up arrow) pushbutPT

Figure 3-8.1. Remote Control Unit TSEC/KY-100

is displayed.

(Z-AVH)

(12) Set the MODE controlT is

displayed.

(13) Set the MODE controlK

displayed.

Change 12

3-17.12

55-1520-240-10

SECTION III NAVIGATION EQUIPMENT

3-24. VHF NAVIGATION AND INSTRUMENT

NOTE

LANDING SYSTEM (AN/ARN-123).

This test requires an external VOR R

generated by a ground station. or ramp

The VHF navigation and instrument landing system (AN/

Set the course indicator OBS contr

ARN-123) is an integrated navigation ra.eiver consisting of

315 degrees indication under the cour

a 160-channel VOR receiver, a 48-channel localizer receiver,

l unit VOR/MB switc

40-channel glideslope receiver, andb. Move the contro

receiver. Each receiver operates indthe test position (down).

consists of a control panel on the conc. The CDI deviation needle should

avionics shelf, and three antennas ocenter ±2 dots. The set

includes VOR and marker beacon self-tesd. The VOR/LOC flag should be burle

a. VOR/LocaRecerive,: V

OR/localizer

e.The RMI should point to the 315 d

receiver processes signals in the fradial (±5 deg

r108.00

through

117.95 MHz. The VOR/localizerf.The marker beacon lamp(s) should i

presented on the course deviation barnate.he HSI on the pilot’s

and copilot’s instrument panels. VOR bearing information is

25. Controls and Function, VHF Navigation and

displayed on the No. 2 pointer of the indicator. If the received

Instrument Landing System Set.

(fig. 3-9)

signal is weak or the set malfunctions, a red NAV flag will

appear on the indicator. The VOR/lCONTROLS/ntenna is on the

bottom of the helicopter at sta. 79INDICATOR

FUNCTION

b. Glideslope Receiver The glidNAV VOLreceiver sec-

Provides power to set whe

tion of the AN/ARN-123 processes signals in the fturned f

rom OFF Turning

range of 329.15 through 335.00 MHz. Glideslope iknob clockwise Increases

tion is displayed on the HSI. The set will also cavolume.ed GS

warning flag to appear on the indicVOR/MB TESThe rSwitch spring-loaded from

nal is unreliable or the glideslope receiver malfTEST position. At TEST,

glideslope antenna is on the forward pylon above the MKR BCN lights Illumi

shield.

nate.

Megahertz SelecLeft frequency select kno

c. Marker Beacon Receiver. The marker beacon

sets second and third dig

receiver is a fixed-frequency receiver

(75 MHz) which

of frequency in one mega-

receives signals from a ground marker beacon transmitter to

hertz steps.

determine helicopter position. The audio output of the marker

Kilohertz SelecSelects last two digits o

beacon receiver is applied through the interphone system to

quency in 50-kilohertz

the headsets as a direct input (no interphone cincrements

switch setting necessary). Three marker beacon lights are on

MB VOL

Adjusts audio output leve

each HSI MODE SELECT panel. The lights are labeled MKR

of marker beacon receiver

BCN and indicate marker beacon passage. Also. specific

Provides power to the

tones will be heard over the interphone while flyimarker beac

on when turned

beacon. Table 3-2 presents the indication as eachfrom OFF.

passed. The lights are tested by moMB SENSly pressLabeled HI

and LO LO

of three lights. The marker beacon antenna is undesensitivity

is used for p

lage forward of the forward cargo hook. Power to otive identification of ma

set is from the DC essential bus through the NAV VORbeaconit

passage HI is use

breaker on the No. 1 PDP. Power is supplied by the 2for station passage ident

instrument bus through the NAV VOR circuit breakercation.at the outer marke

enroute.

1 PDP.

Marker Beacon IThreet

lights marked O.M.

Table 3-2.

Marker Beacon Indicator

Lights

and I on both HSI MODE

SELECT panels. Lights ill

BEACON

LIGHT COLOR TONE (HERTZ)

minate when passing over

Outer (O)

Blue/Green

400

beacons.

Middle (M)

Blue/Green

1300

3-26. Normal Operation - VHF Navigation and

Inner (I) Blue/Green

3000

Instrument Landing System.

The following para-

graphs provide navigation radio set oper

a. Starting.

3-24.1 OPERATIONAL CHECK/SELF-TEST

(1) Interphone AUX switch - ON.

3-18

Change

TM 55-1520-240-10

3-28. Controls and Function, Direction Finder Set

(AN/ARN-89). (fig. 3-10)

CONTROLS/

INDICATOR

FUNCTION

Mode Switch OFF

OFF position deenergizes

the direction finder set.

COMP

COMP position selects

automatic direction find-

ing.

ANT

ANT position permits re-

ception for radio naviga-

tion or as a broadcast re-

Figure 3-9. VHF Navigation and Instrument Land-

ceiver.

ing System Control (ANIARN-123)

LOOP

LOOP position, used m

conjunction with LOOP

(2) NAV VOL switch - ON.

switch, permits aural null

b. VOR/Localizer/ILS Operation.

homing and manual direc-

tion finding.

(1)

Megahertz and kilohertz selector - Set fre-

quency of facility.

AUDIO Control

Adjusts audio level in

COMP position. Used as

(2)

VOR SEL switch on HSI MODE SELECT

RF gain control in LOOP

panel - Press. Check SEL light lit.

or ANT position.

(3)

VOR ADF switch on HSI MODE SELECT

LOOP Switch

When function switch is

panel - Press, if VOR segment is not lit.

set to LOOP, LOOP

(4)

Volume control -

Adjust. Identify facility.

switch enables manual

rotation of ADF loop an-

(5) HSIs - Check for correct indications.

tenna and bearing indica-

c. Marker Beacon Operation.

tor pointer left or right

for manual direction find-

(1) MB VOL switch - ON.

ing, or when homing to a

(2) MB SENS

- HI for enroute. LO for ap-

radio station. Returning

proach.

LOOP switch to center

position stops rotation of

(3) MKR BKN lamps on HSI MODE SELECT

bearing indicator pointer

panels - Check lit at corresponding station

at any desired position.

passage.

d. Stopping

- NAV VOL and MB VOL switches -

OFF.

3-27. Direction Finder Set (AN/ARN-89).

Direction finder set (AN/ARN-89) is an airborne auto-

matic direction finder (ADF) operating within the

frequency range of 100 to 3,000 kHz. The equipment

provides visual and aural facilities for ADF homing and

position fixing. It is used as a navigational radio aid to

continuously and visually indicate the magnetic bearing

of a radio station while providing aural reception. The

bearing of a radio station is displayed on the No.

bearing pointer on the HSI. Power to operate the

direction-finder set is supplied by the No. 1 DC bus and

the AC instrument bus through the NAV ADF circuit

breakers on No. 1 PDP.

Figure 3-10. Direction Finder Control

3-19

TM 55-1520-240-10

CONTROLS/

d. Aural Null.

INDICATOR

FUNCTION

(1)

CW-VOICE-TEST switch - CW.

Coarse Tune Control

Tunes receiver in 100 kHz

(2)

Function switch - LOOP.

steps as indicated by first

two digits of KILO-

(3) LOOP switch

- Rotate for audio and tune

HERTZ indicator.

indicator null. Release switch. Observe bear-

ing to station on indicators. Two null posi-

Fine Tune Control

Provides selection of 10

tions, 180° apart, may be obtained.

kHz digits (continuous

tuning) as indicated by

last two digits of KILO

3-30. Gyromagnetic Compass Set (AN/ASN-43).

HERTZ indicator.

The gyromagnetic compass set (fig. 3-11) is a direction

KILOHERTZ Indicator

Displays operating fre-

sensing system which provides a visual indication of the

quency to which receiver

heading of the helicopter with respect to the earth’s

is tuned.

magnetic field or referenced to a free directional gyro.

TUNE Meter

Provides indication of rel-

Heading information is displayed on both HSIS. The

ative signal strength while

display is used in navigation to maintain flight path

tuning receiver to specific

direction. Also, any heading selected with the heading

radio signal.

bug on either HSI can be automatically maintained by

CW-VOICE-TEST Switch

Three position toggle

the AFCS. Power to operate the system is supplied by

switch. Spring loaded

the No. 1 AC bus and the AC instrument bus through

from TEST.

the NAV CMPS circuit breakers on the No. 1 PDP.

Enables the beat fre-

3-31. Controls and Function, Gyromagnetic Com-

quency oscillator (BFO)

to permit tuning to con-

pass Set (AN/ASN-43). (fig. 3-11 and 3-12)

tinuous wave stations.

CONTROLS/

VOICE

Enables the set to operate

INDICATOR

FUNCTION

as an AM receiver.

LATITUDE Switch

Two-position switch on

TEST

Rotates the bearing indi-

the directional gyro lo-

cator approximately 180°

cated on the avionics

to check operation of the

shelf. This switch is used

set. The TEST switch

to correct for gyro preces-

functions when the func-

sion for the hemisphere of

tion switch is at COMP

operation: N for northern

only.

hemisphere and S for

southern hemisphere.

3-29. Normal Operation - Direction Finder Set.

The following paragraphs discuss ADF set operation.

LATITUDE Control

Rotary control on direc-

Switch

tional gyro labeled 0 to

Starting.

90. It is used to set the

(1) Interphone control panel - Receivers NAV

local latitude into the di-

switch - ON.

rectional gyro for free

gyro operation.

(2) Mode switch - COMP.

SLAVED-FREE Switch

On compass control

(3) CW-VOICE-TEST - CW or VOICE.

panel. When switch is at

(4) Tune controls -

Set frequency. Tune for

SLAVED, the compass

maximum signal strength on the tuning meter.

cards on both HSIs are

slaved to the output of

(5) AUDIO control - Adjust.

the remote compass and-

ADF Operation.

stabilized by the direc-

tional gyro. At FREE, the

(1) VOR ADF switch on HSI MODE SELECT

cards are referenced to

panel

- Press, if ADF segment is not lit,

the directional gyro only

(2) Check for the correct bearing indication, on

and act as turn indicators.

HSI No. 2 bearing pointer.

FREE is used primarily in

polar regions where mag-

c. Radio Receiver Operation.

netic indications may be

(1) Function switch - ANT.

unreliable.

(2) Tune control -

Set frequency; then tune for

maximum signal strength on the tuning meter.

3-20

TM 55-1520-240-10

CONTROLS/

NOTE

INDICATOR

FUNCTION

If synchronizing becomes necessary in

flight with the AFCS on, position the

Annunciator

Indicates misalignment between

SWIVEL switch to UNLOCK. After

compass cards and gyro-

synchronization is complete, position the

compass when pointer is not

SWIVEL switch to LOCK This prevents

centered.

unwanted yaw axis inputs.

PUSH TO SET synchro-Rotated in (- ) or (+)

nizing knob

direction

as indicated by

annunciator pointer to align

c. Manual Synchronization. If power has been

compass cards with gyro-

applied to the system with the compass slaving switch at

compass.

FREE or if the system has been operated in the free

HDG Flag

A red flag on both HSIs

directional gyro mode for a period of time, the compass

indicates

failure

the

cards will not be aligned with the magnetic heading of the

gyromagnetic compass system

helicopter. The system can be reset to the correct

when displayed.

magnetic heading by pushing and turning the PUSH TO

SET knob in the direction of the symbol indicated by the

3-32.

Operating Procedures - Gyromagnetic

annunciator pointer until the pointer is centered. If the

Compass Set. (fig. 3-11)

slaving switch is then set to SLAVED. the compass

cards will maintain correct magnetic heading.

a. Slaved Gyro Operation. With compass slaving

switch at SLAVED, the system operates in the slaved

mode and the directional gyro precesses to align the

compass cards on the HSIs with the magnetic heading of

the helicopter. During the first 2 minutes after power is

applied, the system operates in a fast slave mode while

the gyro attains its speed. After this initial alignment

period is complete, the gyromagnetic compass will return

to the normal slaved mode. During this mode of

operation, the compass cards will remain aligned with

the magnetic heading of the helicopter. The annunciator

pointer will occasionally point to a dot (a ) or a plus sign

(+) indicating that corrections are automatically being

made.

b. Free Directional Gyro Operation. If the compass

slaving switch is at FREE, the system operates in the

free directional mode. In this mode, the compass cards

car be set to any heading by pressing the PUSH TO SET

knob and turning it until the cards reach the selected

setting. Normally, the free directional gyro mode is

employed only in polar regions of the earth where

magnetic references are unreliable. However, it can be

useful if the slaving system malfunctions. For proper

operation, the latitude controls on the directional gyro

(fig. 3-12) must be set to the local latitude.

Figure 3-12. Directional Gyro (CN-998/ASN-43)

Figure 3-11. Gyromagnetic Compass Set Control

Panel

Change 6 3-21

TM 55-1520-240-10

3-33.

Doppler Navigation Set (AN/ASN-128).

navigation, with position readout available in both

universal transverse mercator (grid) (UTM) and latitude

NOTE

and longitude (lat/long). Navigation and steering is done

When the Airborne Navigation Set

using lat/long coordinates, and bilateral UTM-lat/long

ANIASN-149

(Global

Positioning

conversion routine is provided for UTM operation.

System, GPS) is installed, the Doppler

NavigationSetAN/ASN-128is controlled

b. The system in conjunction with heading data

by the GPS CDU. For a description of

from the gyro compass, and pitch and roll data from the

the Airborne Navigation Set and Doppler

copilot’s attitude gyro, provides velocity, position, and

Navigation Set, refer to paragraph 3-65.

steering information from ground level to 10, 000 feet.

a. The doppler navigation set (fig 3-13) is a self-

c. The computer-display unit (CDU) is on the

contained navigation system that does not require any

canted console, between the pilot and copilot positions.

ground-based aids. The system provides worldwide

Course

Figure 3-13. Doppler Navigation Set Control (AN/ASN- 128)

3-22 Change 6

TM 55-1520-240-10

deviation, bearing, distance to destination, and NAV

CONTROLS/

GO/NO GO are also presented on the HSI. Built in test

INDICATOR

FUNCTION

equipment (BITE) continuously monitors system oper-

ation. If a failure occurs, a malfunction indicator lamp

SEL on the HSI MODE

will light and coded data, indicating the failed compo-

SELECT panel is pressed.

nent, will be displayed on the CDU when the MODE

(Right Display)

Track angle error (TKE)

switch is set to TEST. Power to operate the set is

in degrees and right or

supplied by the No. 2 DC bus through the NAV

left of present helicopter

DOPPLER circuit breaker on the No. 2 PDP, and the

heading.

No. 1 AC instrument bus through the NAV DOPPLER

GS/TK

circuit breaker on the No. 1 PDP.

(Left Display)

Ground speed (GS) in

km/hr.

3-34. Controls and Function - Doppler Naviga-

tion Set. (fig. 3-13 and table 3-3)

(Right Display)

Track angle in degrees

relative to true north.

CONTROLS/

PP with mode

INDICATOR

FUNCTION

switch set to UTM

MODE Selector

Selects doppler navigation

(Center

Present position UTM

mode of operation as fol-

Display)

zone.

lows:

(Left Display)

Present position UTM

OFF

Turns set off. Pull knob

square designator and

out to move from, or to

casting in km to nearest

this position.

10 meters.

LAMP TEST

Checks operation of all

(Right Display)

Present position UTM

lamps and lamp segments.

northing in km to nearest

TEST

Initiates (BIT) for set.

10 meters.

System reverts to backup

PP with MODE switch

navigation operation dur-

set to LAT/LONG

ing this mode.

(Left Display)

Present latitude position

UTM

Selects universal trans-

in degrees, minutes, and

verse mercator coordinate

tenths of minutes.

system for display and

(Right Display)

Present longitude position

insertion of information.

in degrees, minutes, and

LAT/LONG

Select latitude/longitude

tenths of minutes.

coordinate system for dis-

DIST/BRG/TIME

play and insertion of in-

(Center

Time to the destination

Display)

set on FLY-TO DEST

BACKUP

Places set in remembered

thumbwheel in minutes

velocity mode of opera-

and tenths of minutes.

tion.

(Left Display)

Distance to the destina-

DISPLAY

SelectorSelects navigation data for

tion set on FLY-TO

display as follows:

DEST thumbwheel in km

WIND SP/DIR

Used only with BACKUP

and tenths of a km.

mode.

(Right Display)

Bearing to the destination

(Left Display)

Windspeed kilometer(s)

set on FLY-TO DEST

per hour.

thumbwheel in degrees.

(Right Display)

Direction (degrees) rela-

Bearing is also indicated

tive to true north.

by the No. 1 bearing

pointer on both HSIs.

XTK/TKE

DEST/TGT

(Left Display)

Distance crosstrack error

(XTK) in km and tenths

(Center

UTM zone of destination

of a km left or right of

Display)

set on DEST DISP thum-

helicopter. Track error

bwheel.

will also be displayed by

the course deviation indi

-cator (CDI) on the HSI

when DOP

Change 6 3-23

TM 55-1520-240-10

CONTROLS/

INDICATOR

FUNCTION

INDICATOR

FUNCTION

(Left Display)

UTM square designator

(present position) and Hr

and casting or latitude (N

(home).

84° to S 80° approx) of

Keyboard

Used to enter data into

destination set on DEST

system. Keys set up data

DISP thumbwheel.

on display. All resulting

SPH/VAR

actions are initiated upon

release of the key.

(Left Display)

Spheroid code of destina-

tion set on DEST DISP

FLY-TO-DEST Thumb-

Selects destination to

thumbwheel.

wheel Switch

which steering informa-

(Right Display)

Magnetic variation (in

tion is desired. Destina-

degrees and tenths of de-

tions are 0 through 9, P

(present position) and H

grees) of destination set

(home).

on DEST DISP thumb-

wheel.

ENT Key

Enters data set upon key-

MAL Indicator Lamp

Lights when set malfunc-

board into memory when

tions. In case of an inter-

pressed.

mittent malfunction, sys-

CLR Key

Clears last entered char-

tem may operate

acter when pressed once.

correctly, but must be cy-

Clears entire display panel

cled to OFF and then to

under keyboard control

on to put MAL light off.

when pressed twice.

MEM Indicator Lamp

Lights when radar portion

of set is not tracking. May

3-35. Display and Keyboard Operation.

occur over smooth water.

In LAT/LONG coordinates, the two fields of control

DIM Control

Controls light intensity of

are the left and right displays. In UTM coordinates, the

display characters.

first field of control is the center display and the second

Left, Right, and Center

Alphanumeric and nu-

field is the combination of the left and right displays.

Display Lamp

meric characters that dis-

When pressing the KYBD pushbutton, one or other of

play data as determined

the fields described above is under control. If it is not

by setting of DISPLAY

desired to change the information in the field under

control, the pilot can advance to the next field of the

switch, mode switch, and

keyboard.

display panel by pressing the KYBD pushbutton again.

Target Storage Indicator

Displays destination num-

3-36. Data Entry.

ber (memory location) in

which present position

To enter a number, press the corresponding key. To

will be stored when TGT

enter a letter, first press the key corresponding to the

STR pushbutton is

desired letter. Then press a key in the LEFT, MID, or

pressed.

RIGHT column corresponding to the position of the

TGT STR Pushbutton

Stores present position

letter on the pushbutton.

data when pressed.

Example: To enter an L, first press L, then either 3, 6,

KYBD Pushbutton

Used in conjunction with

or 9 in the RIGHT column. The computer program is

keyboard to allow data

designed to reject unacceptable data (for example, a

entry. KYBD pushbutton

UTM area of WI does not exist, and will be rejected). If

is always lighted when

the operator attempts to insert unacceptable data, the

system is on.

display will be blank after ENT is pressed.

DEST DISP Thumbwheel

Destination display thum-

3-37. Starting Procedure.

Switch

bwheel switch is used

along with DEST/TGT

a. MODE selector

- LAMP TEST. All lights and

and SPH/VAR positions

lamp segments should be lit.

of DISPLAY switch to

select destination whose

(1) Left, right, center and target storage indica-

coordinates or magnetic

tor - Lit (fig. 3-13). All other lights should be on,

variation to be displayed

(2) Turn DIM control fully clockwise, then fully

or entered. Destinations

counterclockwise, and return to full clockwise; all seg-

are 0 through 9, P

ments of the display should alternately glow brightly, go

off, and then glow brightly.

3-24

TM 55-1520-240-10

Table 3-3. Computer-Display Unit Data displays

CENTER DISPLAY

LEFT DISPLAY

RIGHT DISPIAY

RANGE

DATA

RANGE

DATA

RANGE

SWITCH POSITION

DATA

WIND SP/DIR

Windspeed

999 km/h

Wind Direction

359°

XTK/TKE

Crosstrack Dis-

L/R 999.9 km

Track Angle

R/L 180°

tance Error

Error

GS/TK

Groundspeed

999 km/h

Track

359°

PP UTM

UTM Zone

Note 2

Area/Easting

WV9999

Northing

9999

LAT/LONG

Latitude

N84°00.0"

Longitude

E/W 180°00.0”

S 80°00.0"

DIST/BRG/TIME

Time

99.9 Min.

Distance to Go

999.9 km

Bearing

359°

DEST/TGT UTM

UTM Zone

Note 2

Area/Easting

WV9999

Northing

9999

Note 3

LAT/LONG

Latitude

N 84°00.0"

Longitude

E/W 180°00.0"

S 80°00.0"

SPH/VAR

Spheroid

Note 1

Variation

E/w 180°

Note 4

NOTES

1. See table 3-4 for spheroid data codes and covered areas.

2. Numeric 01-60.

Alpha: C-X, except I and O.

3. Typical 100 km Designaton

Column Designation A-Z, except I and O.

Row Designator A-V, except I and O.

4. Variation displayed is for destination indicated by DEST DISP thumbwheel.

b. MODE selector -

TEST. After about 15 seconds,

DISPLAY

left display should display GO. Ignore the random

LEFT

RIGHT

REMARKS

display of alpha and numeric characters which occurs

If right display is P, then

during the first 15 seconds. Also ignore test velocity and

angle data displayed after the display has frozen. After

pitch or roll data is missing or

in error. In this case, pitch

about 15 seconds, one of the following five displays will

be observed in the first two character positions in the

and roll in the computer are

left display.

both set to zero and naviga-

tion is degraded. Problem

NOTE

may be in the vertical gyro-

If the MAL lamp lights during any mode of

scope or helicopter wiring.

operation

except LAMP TEST, the

C, R, S,

A failure has occurred and

computer-display unit MODE switch should

or H fol-

the system has automatically

be set to OFF, and then to TEST, to verify

lowed by

switched to a BACKUP mode

the failure. If the MAL lamp remains on at

a numeric

of operation using last re-

TEST, notify maintenance.

code

membered velocities for navi-

If the TEST mode display is MN or NG, the

gation. The operator can, as

MODE switch should be recycled through

an option, enter his best esti-

OFF to verify that the failure is not a mo-

mate of ground speed and

mentary one. If the TEST mode display is

track angle.

MN, the data entry may be made in the

C, R, S,

A failure has occurred and

UTM or LAT/LONG mode, but any naviga-

or H fol-

the BACKUP mode used for

tion must be carried on with the system in

the BACKUP mode.

lowed by

manual navigation (MN) is

a numeric

the only means of valid navi-

DISPLAY

code

gation. The operator may use

the computer as a dead reck-

LEFT

RIGHT

REMARKS

oning device by entering

Display

System is operating satisfacto-

ground speed and track data.

blanks

rily.

3-25

TM 55-1520-240-10

DISPLAY

b. DISPLAY selector - SPH-VAR.

LEFT

RIGHT

REMARKS

c. DEST DISP thumbwheel - P, numeral, or H as

desired.

The operator should update

present position as soon as

d. KYBD pushbutton

- Press. Observe display

possible, because it is possible

freezes and TGT STR indicator blanks. Press KYBD

significant navigation errors

pushbutton again and observe left display blanks. If no

spheroid data is to be entered, KYBD pushbutton-

may have accumulated.

- Press again, go to step g.

C, R, S,

A failure has occurred in the

e. Spheroid data (table 3-4) - Entry. (Example: INO).

or H fol-

system and the operator

Press keys 3, 3, 5, 5 and 0. Left display should indicate

lowed by

should not use the system.

INO.

a numeric

code

f. ENT key -

Press if no variation data are to be

entered.

The 9V battery has failed.

The system will still operate

g. KYBD pushbutton

- Press, if variation data is to

but all stored data will be lost

be entered, and note right display blanks.

when set is turned off. Data

h. Variation data -

Enter. (Example: E001.2, press

must be recentered.

keyboard keys 2, 2, 0, 0, 1 and 2. Press ENT key. the

Random Random

A failure occurred and the

entire display will blank and TGT STR number will

reappear, display should indicate INO E001.2.)

display

operator should not use the

system.

If operation is to occur in a region with

relatively constant variation, the operator

3-38. Entering Data.

enters variation only for present position,

This initial data is inserted before navigating with the

and the computer will use this value through-

doppler.

out the flight.

a. Spheroid of operation, when using UTM coordi-

Table 3-4. Spheroid Data Codes

nates.

b. UTM or LAT/LONG coordinates of present posi-

SPHEROID

CODE

AREA COVERED

tion.

CLARKE

1866

United States north

c. Magnetic Variation (MAG VAR) of present posi-

tion.

through North Pole

CLARKE

1880

Africa west through

d. Coordinates of desired destination -

0 through 5

Algeria

and H: (6 through 9 are normally used for target store

INTERNATIONAL

All of Europe, Saudi

locations; but may also be used for destinations.) It is

not necessary to enter all destinations in the same

Arabia, Greenland,

coordinate system.

South America, In-

dian Ocean, Pacific

NOTE

Ocean, and Atlantic

It is not necessary to enter destinations

Ocean

unless steering information is required, un-

BESSEL

Indonesia, Manchu-

less it is desired to update present position

ria, to Eastern Rus-

by overflying a destination, or unless a

sia

present position MAG VAR computation is

EVEREST

Mt. Everest, India,

desired. If a present position MAG VAR

and Pakistan

running update is desired, destination MAG

AUSTRALIAN

Australia

VAR must be entered. The operator may

NATIONAL

enter one or more destination variations to

effect the variation update; it is not neces-

sary for all destinations to have associated

MAG VAR entered.

3-40. Entering Present Position or Destination in

UTM.

e. Variations of destinations.

The variation of a destination must be entered after the

associated destination coordinates are entered, since

3-39. Entering Spheroid and/or Variation.

each time a destination is entered its associated varia-

a. MODE

selector

- UTM, LAT/LONG or

tion is deleted. The order of entry for present position is

BACKUP.

irrelevant.

3-26

TECHNICAL MANUAL MAINTENANCE MANUAL FOR ARMY CH-47D HELICOPTER (1992) - page 5