ARMY MODEL UH-1H/V HELICOPTERS. OPERATOR’S MANUAL (1988)

55-1520-210-10

Controls and Functions of Instrument Panel AN/ASN-175 System Components

CONTROL/INDICATOR

FUNCTION

1. GPS FILL Ports

Two independent ports that are used to load data into the

AN/ASN-175 system as follows:

DATA Receptacle

Provides connection for Precision Lightweight GPS

Receiver (PLGR) AN/PSN-11 to load GPS time and

Space Vehicle (SV) data into the AN/ASN-175 system.

KYK Connector

Provides connection for Electronic Transfer Device KYK-

13/TSEC to load classified variables (cryptokeys) into the

AN/ASN-175 system.

2. GPS ZEROIZE Switch

Enables pilot or copilot to zeroize (erase) all data that has

been loaded into the AN/ASN-175 system via the GPS

FILL ports (DATA and KYK). Also resets pre-

programmed aircraft requirement settings to factory

default. It is used only in an emergency situation to

prevent potential enemy compromise of classified

information. The switch is protected with a guard to

prevent inadvertent actuation.

*3. DME IND (Indicator) Switch

Two position toggle switch that selects distance data

from either the AN/ARN-124 DME system (VORTAC

position) or the AN/ASN-175 system (GPS position) for

display on the DME indicator.

4. CDI SEL (Select) VOR/GPS

Two switch-indicator assemblies that provide both

Switches/DME IND Indicators

DME indications and remote switching control for Course

Deviation Indicator (CDI) display as follows:

VOR/DME

When pressed, activates Remote Switch Assembly to

select VOR navigation (course deviation) signal for

display on the CDI. Also provides DME cue to alert pilot

that distance data is supplied from the AN/ARN-124

(VORTAC) Distance Measuring Equipment (DME) system

(if installed), as selected by DME IND switch.

GPS/DME

When pressed, activates Remote Switch Assembly to

select GPS navigation (course deviation) signal for

display on the CDI. Also provides DME cue to alert pilot

that distance data is supplied from the AN/ASN-175

(GPS) system, as selected by DME IND switch.

3-32.8

Change 18

TM 55-1520-210-10

Controls and Functions of Instrument Panel AN/ASN-175 System Components (Cont)

CONTROL/INDICATOR

FUNCTION

5. GPS Annunciators

Two dual annunciator assemblies that display the oper-

ational status of the AN/ASN-175 system as follows:

WPT (Waypoint)

Indicates that active waypoint is being approached.

The time between illumination of indicator and arrival at

active waypoint may be selected by the operator. The

same WPT status information is displayed on the WPT

annunciator on the receiver/display unit

HLD (Hold)

Indicates that active flight plan has been suspended at

current active waypoint. The same HLD status infor-

mation is displayed on the HLD annunciator on the

receiver/display unit.

MSG (Message)

Indicates that one or more of the messages in the

queue is unread. When indication is steady, indicates

presence of one or more messages in the queue

requiring operator action. When indication is not

present, indicates that there are no messages in the

queue other than CDI scaling message. The same MSG

status information is displayed on the MSG annunciator

on the receiver/display unit.

APR (Approach)

Indicates that aircraft is at or within two nautical miles

of final approach fix and that all approach requirements

have been met. The same APR status information is dis-

played on the APR annunciator on the receiver/display

unit.

6. NO. 2 BRG PTR (Bearing

Two position toggle switch that selects either GPS

Pointer) Switch

bearing (GPS position) or VOR bearing (VOR position) for

display by pointer No. 2 on both the pilot’s and

copilot’s Radio Magnetic Indicator (RMI).

* Applicable to aircraft with AN/ARN-124 DME system installed only.

Change 18 3-32.9

TM 55-1520-210-10

c. Operation

- Satellite Signets Navigation Set

indicator assembly lighting operation with PILOT

AN/ASN-175.

lighting rheostat on the INST LTS panel located on

the overhead console as follows:

CAUTION

1. PILOT lighting rheostat - OFF,

Observe that GPS and DME indicator lights are at

•

The AN/ASN-175 shall not be used as

full brightness level and that pilot’s instrument

a substitute for the VOR or ADF.

lights are off.

When AN/ASN-175 is used for IMC

flight, either the VOR or ADF shall be

2. PILOT lighting rheostat - Turn

clockwise from OFF to on position at minimum

onboard and operational.

setting. Observe that GPS and DME indicator

lights and the pilot’s instrument lights are at low

• During navigation with the AN/ASN-

brightness level.

175 system, avoid operation of the

3. PILOT lighting rheostat -

(VHF) Radio on the following

Slowly turn clockwise from minimum to maximum

frequencies: 121.150 MHz, 121.175

setting.

Observe that GPS and DME indicator

MHZ, 121.200 MHz,

131.250 MHz,

lights and the pilot’s instrument lights change

131.275 MHz, and 131.300MHz

incrementally from low to full brightness.

(d) Adjust instrument lights for best

• During navigation with the AN/ASN-

viewing or, if desired, turn them off.

175 system, avoid operating the

AN/ARC-164 radio at 225.100 MHz.

NOTE

The operational procedures that follow

NOTE

in steps (2) through (7) ensure that the

AN/ASN-175 system is functional and

The second VOR system (ARN-82)

has the current cryptokeys, valid GPS

shall not be operated in an aircraft

time and Space Vehicle (SV) data,

with the AN/ASN-175 installed.

defined mission duration, and the anti-

spoof safety enable required to operate

using the P(Y) code. These procedures

(1) Preoperational

and

AN/ASN-175

are then followed by operational

System Instrument Panel Lighting Checks.

procedures

RAIM/GPS Status

Determination

and Preparation for

AN/ASN-175 Departure in steps (8) and

(a) GPS ASN-175 circuit breaker -

(9),

respectively.

Finally,

Special

Engaged.

Operating Functions and AN/ASN-175

System Shutdown are provided in steps

(b) On. .pilot’s side of instrument

(10) and (11), respectively.

panel, set GPS/DME, controls as follows:

(2) AN/ASN-175 System Power - ON.

1. NO. 2 BRG PTR switch - GPS.

NOTE

2. CDI SEL GPS switch/DME

• Ensure a current Navigation Database

Card is installed in GPS Navigation Set

indicator assembly

- Press. Observe that GPS

Receiver/Display Unit (RDU). Although

indicator light in CDI SEL GPS switch/DME

the following operations can be

indicator assembly comes on.

performed with an expired card, this

condition will be reported by the RDU

NOTE

during test.

Perform step

3 on aircraft with

•

When the RDU is turned on, a BIT check

Distance Measuring Equipment (DME)

automatically performed in the

AN/ARN-124 system installed only.

AN/ASN-175 system. During this time,

do not press any of the keys on the RDU

DME IND switch

GPS.

until

the power on

sequence

Observe that DME indicator light in CDI SEL GPS

switch/DME indicator assembly comes on.

completed. If any key is pressed during

power on sequence, the RDU disregards

the key press.

3-32.10

Change 18

55-1520-210-10

NOTE

(a) Power switch - Turn clockwise to

ON position. Several introductory system displays

will appear briefly on the RDU and then BIT cycles

In the following display, the second

to a five second lamp self-test.

line will scroll across continuously.

The full line is NO KEYS NEED

(b) Observe the five second lamp self-

INITIALIZE:

test. All lamps for the annunciators and keys on

the RDU and for the GPS annunciators (WPT/HLD

A-S SAFETY OK

indicators and MSG/APR indicators) on the pilot’s

side of instrument panel come on for

approximately five seconds.

NO KEYS

NEED INITIALIZE

observe BlT result lines that scroll up on display.

NOTE

The following display appears one line at a time

on RDU when BIT passes:

If display is as shown and GPS

time/space

vehicle

data

and

cryptokeys are to be loaded into

NAV Computer

AN/ASN-175 system, proceed to step

AUX IO Computer

-OK

(4). If display is not as shown and

GPS Computer

-OK

GPS time/space vehicle data and

GPS Antenna

-OK

Servo Amp

cryptokeys are to be loaded into

-OK

Memory Battery

AN/ASN-175 system, proceed to step

Database

-OK

(5). If GPS time/space vehicle data

and cryptokeys are not going to be

loaded into AN/ASN-175 system,

NOTE

proceed as follows:

If BIT fails, the applicable test result

(b) Observe that ENT key on RDU is

line(s) displays a FAIL. If a current

flashing.

Navigation Database Card is not

installed or a card is missing, the

Database result line displays EXPIRED

selector knob of MENU control counterclockwise

or N/A, respectively. When a FAIL,

until DISABLE

EXPIRED, or N/A is displayed, the

MSG annunciator on the RDU will

(d) Outer selector knob of MENU

flash. This cues the user to press the

control - Turn counterclockwise until DISABLE is

MSG key on the RDU to display an

displayed and the D in DISABLE is flashing.

error message that relates to the

failure mode of the AN/ASN-175

(e) ENT key

- Press to accept

system. If more than one failure

ENABLED setting.

occurs, as indicated by the flashing

MSG annunciator, press MSG key for

(f) Proceed to step (7).

each error message. Read each error

message in turn and take the

(4)

Cryptokey Loading Initialization For No

appropriate action.

Keys Display.

(3) Anti-Spoof/Cryptokey Status

(a) Observe that ENT key on RDU is

Determination.

flashing.

(a) Observe RDU display until ANTI-

(b) ENT key - Press. Observe that A-S

SPOOF/ CRYPTOKEY status screen appears.

SAFETY: ENABLED is displayed and the E in

ENABLED is flashing.

Change 18

3-32.11

55-1520-210-10

(7) Setting Mission Duration.

(8) RAIM/GPS Status Determination.

(a) Outer selector knob of MENU

(a) Observe RAIM annunciator, If

control : Turn until the following display appears:

RAIM annunciator is illuminated, indicates that

AN/ASN-175 cannot provide required integrity for

flight and that problem should be referred to

SET MISSION?

AVUM. In the event that this problem occurs

during flight, any navigation using the AN/ASN-

(ENT)

175 must be crossed checked for position using

other approved sources.

(b) ENT key - Press. Observe that the

following START DATE display appears with the

(b) Observe GPS annunciator. If GPS

first character of date field selected:

annunciator is illuminated, proceed to step (c). if

not, proceed to step (d).

a 3-D position solution and is not ready for the

mission. Wait two minutes and observe GPS

annunciator.

If GPS annunciator

remains

control - Turn until desired character is displayed

illuminated after two minutes, repeat procedures

in that character of date field.

starting from step (5) if operating in a suspected

spoofed environment.

If GPS annunciator still

(d) Outer selector knob of MENU

remains illuminated after repeating procedures,

control - Turn to select the next character of date

refer problem to AVUM. If operating in a known

field.

spoof free environment and GPS annunciator still

remains illuminated, refer problem to AVUM for

(e) Repeat steps (c) and (d) until

resetting the RDU. When reset, the RDU must be

entire start date has been entered.

reprogrammed to the required aircraft settings.

(f) Outer selector knob of MENU

(d) The AN/ASN-175 is providing a 3-

control - Turn until first digit of mission duration

D position solution and is ready for the mission.

field is selected.

To determine the accuracy and Figure of Merit

(FOM) of solution, proceed as follows:

(g) Inner selector knob of MENU

control - Turn until desired digit is displayed in

NOTE

that digit of duration field.

The AN/ASN-175 is now calculating

(h) Outer selector knob of MENU

position and the display will now show

control - Turn to select next digit of duration field.

the present position.

(i) Repeat steps (g) and (h) until

1. AUX key - Press and hold for

duration has been completely entered.

one second until SYSTEM STATUS mode is

selected and PRESENT POSITION display appears:

(j) ENT key - Press to set mission

duration.

POSITION EPE:

XXm

LL XX°XX ^.xxx XXXX° xx ^.xxx x

(k) After mission duration is set,

SETTING MISSION STANDBY will be displayed.

wait until display changes to COMMAND

COMPLETE and then proceed to step (8).

3-32.14

Change 18

TM 55-1520-210-10

2. AUX key - Press until SENSOR

key - Press a second

STATUS mode is selected and the GPS STATUS

time to join leg and activate flight plan.

display appears:

flight

plan includes a

GPS: 3D/PRS

RAIM

Standard Instrument Departure (SID) when ready

MODE: TERM

1.6

to depart, depart in accordance with the

applicable procedures in step (b) below and then

NOTE

fly the flight plan following the prompts from the

AN/ASN-175.

If flight plan does not include a

FOM is an integer between 1 and g

SID, depart in accordance with published

and is determined from the RDU

procedures and then fly the flight plan following

position error.

the prompts from the AN/ASN-175.

The FOM values and its

(b) Fly Standard Instrument Departure

meaning as determined from the RDU position

(SID) Using GPS.

error are as follows:

NOTE

FOM Value

Meaning

<25m

Proceed to step 1 to fly direct to the

>25m, <50m

first waypoint in SID and fly the entire

>50m,

<75m

procedure, step 6 to join any specific

>75m, <100m

leg in SID and fly the rest of

>100m,

<200m

procedure, or step 11 to fly direct to

>200m,

<500m

any waypoint In SID and fly the rest of

>500m,

<1000m

procedure.

>1000m,

<5000m

>5000m

1. Select desired SID.

4. Outer selector knob of MENU

2. -D key- Press

control - Turn until the flowing display appears:

3 .. Inner selector knob of MENU

ESTIMATED ACCURACY:

control - Turn to change course to/from waypoint,

GPS:

9m FOM:

if desired.

(9)

Preparation

For

AN/ASN-175

key - Press a second

Departure.

time to make first waypoint active waypoint and

(a) Flight Plan Loading and Activation.

to activate SID.

1. FPL key

- Press to select

5. Fly SID following prompts

STORED FLIGHT PLANS display.

from AN/ASN-175.

2. Inner selector knob of MENU

6. Select desired SID.

control - Turn to select desired flight plan.

7. Turn outer selector knob of

3. FPL key - Press. The FPL key

MENU control to select desired leg of SID.

will now be flashing.

8. Press

key.

4. Inner selector knob of MENU

control - Turn to select desired leg of flight plan.

9. Press

key a second time

to join leg and to activate SID.

key - Press and note

leg’s course.

Change 18

3-32.15

55-1520-210-10

key - Press a second

10. Fly SID following prompts

time to make waypoint the active waypoint.

from AN/ASN-175.

5. The

AN/ASN-175

11. Select desired SID.

automatically switches to NAV mode and displays

the PRIMARY NAVIGATION page as follows:

12. Outer selector knob of MENU

control - Turn to select desired leg of SID.

13.

key - Press.

^TO LAX A 120° 143: 0:34

14. Outer selector knob of MENU

control

- Turncounterclockwise to select first

waypoint of leg. Outer selector knob of MENU

6. For reference, set Course

control - Turn clockwise to select second

Deviation (CDI) or Horizontal Situation Indicator

waypoint of leg.

(HSI) to displayed course.

15. Inner selector knob of MENU

7. When

ready,

depart

control

- Turn to change course to/from

accordance with published procedures and follow

waypoint, if desired.

prompts from AN/ASN-175 to fly to waypoint.

16.

- Press key a second

(10) Special Operating Functions.

time to fly direct to waypoint and to activate SID.

(a) Zeroizing the Cryptokeys.

17. Fly SID following prompts

from AN/ASN-175.

NOTE

The procedures that follow provide

instructions to zeroize the cryptokeys,

NOTE

if previously loaded, in the RDU.

Normally, the cryptokeys should be

You may fly direct to any waypoint in

zeroized after every mission. If the

the database.

Select the waypoint

cryptokeys are not zeroized after

from the WPT, NRST, NAV or FPL

completion of a mission, it will not be

mode.

Flying direct to a waypoint

possible to set a new mission

selected from the FPL mode will

duration. The cryptokeys, however,

activate the flight plan starting at the

will automatically zeroize when the

selected waypoint.

mission duration expires.

1. Select desired waypoint.

1. AUX key - Press until USER

SETUP mode appears on display.

key - Press. Observe

the following display:

2. Inner selector knob of MENU

control

- Turn until SECURITY MODULE page

appears as follows:

A-S SAFETY OK

VALID KEYS

3. Inner selector knob of MENU

control

- Turn to change course to/from

waypoint, if desired.

3-32.16

Change 18

55-1520-210-10

3. Outer selector knob of MENU

(b) Zeroizing All Variables.

control - Turn until the following display appears:

NOTE

The procedures that follow provide

instructions to zeroize all mission

variables. These variables should be

zeroized whenever the RDU is

4. ENT key - Press to initiate the

removed for maintenance or for any

keys zeroizing function. Observe that AUX key is

other purpose.

flashing and that the following display appears:

1. AUX key - Press until USER

SETUP mode appears on display.

2. Inner selector knob of MENU

control

- Turn until SECURITY MODULE page

appears as follows:

NOTE

Press any key other than the AUX

key to abort the zeroize keys

3. Outer selector knob of MENU

function.

control - Turn until the following display appears:

5. AUX key - Press to complete

the zeroize keys function. Observe that display

changes to the STANDBY mode as follows:

ZEROIZING KEYS

4. ENT key - Press to initiate the

STANDBY

zeroize all function. Observe that AUX key is

flashing and that the following display appears:

6. After a few seconds, observe

that the following display appears:

NOTE

Press any key other than the AUX key

to abort the zeroize all function.

5. AUX key - Press to complete

the zeroize keys function. Observe that the

following display appears briefly and then the

AN/ASN-175 will reset itself.

Change 10

3-32.17

TM 55-1520-210-10

RDU

Auxiliary

3. ENT key - Observe that it

Input/Output Ports.

is flashing.

NOTE

4. ENT key - Press.

Actuation of the GPS ZEROIZE switch

5. Outer selector knob of

on the instrument panel will erase all

MENU control

- Turn counterclockwise until

variables stored in the RDU and will

DISABLE is displayed and the D in DISABLE is

reset the auxiliary input/output (I/O)

flashing.

ports of the RDU to factory default. As

a result, the GPS ZEROIZE switch

6. ENT key - Press to accept

should be normally used when it is

the DISABLE setting.

absolutely necessary to verify that it is

functional or for emergency situations.

7. AUX key

- Press until

In the event that the GPS ZEROIZE

INSTALL SETUP mode appears on display.

switch is actuated, the RDU will have

to be reprogrammed to satisfy the

8. Inner selector knob of

aircraft requirements. Instructions for

MENU control - Turn until AUX l/O SETUP

actuating the GPS ZEROIZE switch and

display appears as follows:

reprogramming the RDU are as follows:

1. Locate GPS ZEROIZE switch

on center section of instrument panel.

2. GPS ZEROIZE switch - Raise

cover and toggle switch to the up position to

initiate the zeroize. Observe that RDU resets,

displays a ZEROIZE IS SUCCESSFUL message,

and then cycles through the power on/BIT checks

until the ANTI-SPOOF/CRYPTOKEY status screen

appears as follows:

3-32.18

Change 18

55-1520-210-10

Table 3-1. RDU Auxiliary Input/Output Port Settings.

CHOICE SETTlNGS

AIRCRAFT SETTINGS

* None

XYZ Magnetic-Synchro

XYZ TRUE-Synchro

PRESSURE ALTITUDE

Serial-RS-422/RS-232

Parallel

INPUT

* Parallel

OLEO INPUT

* None

None

Air

Ground

SYNCHRO OUTPUT #1

* Off

** BRG-HDG + 180°

HDG

----

SYNCHRO

HDG

----

DTK

----

TDTK

----

BRG

-----

TBRG

----

TKE

----

---

----m----

TKE-DA

------

---------

DA-TKE

-----

BRG-HDG

-------

--------------

+0.00

+180

-------------

-----------------------

SYNCHRO

SIN/COS

SYNCHRO OUTPUT #2

Same as SYNCHRO OUTPUT #1

* * BRG-HDG + 180° SYNCHRO

SYNCHRO OUTPUT #3

Same as SYNCHRO OUTPUT #1

Off

DIGlTAL OUTPUT X3

ARINC 561

*ARlNC 568

*Indicates factory default setting.

**To select BRG-HDG

+ 180° SYNCHRO setting after obtaining the BRG-HDG +000° SYNCHRO display,

proceed as follows:

1. Outer selector knob of MENU control - Turn clockwise one detent position and observe that + sign in

BRG-HDG +000° SYNCHRO display flashes.

2. Inner selector knob of MENU control - Turn clockwise one detent position to obtain BRG-HDG + 180°

SYNCHRO setting display.

Change 18

3-32.19

TM 55-1520-210-10

NOTE

1. AUX key - Press until INSTALL

SETUP mode is selected.

There are seven auxiliary I/O port

categories (HEADING INPUT, PRESSURE

2. Inner selector knob of MENU

ALTITUDE

INPUT,

OLEO

INPUT,

control - Turn until SELECT USER UNIT, TURN

SYNCHRO OUTPUT #1, SYNCHRO

OUTER KNOB is displayed.

OUTPUT # 2, SYNCHRO OUTPUT # 3,

and DIGITAL OUTPUT # 3) that must be

3. Outer selector knob of MENU

selected and programmed internally to

control

- Turn until desired unit/parameter is

satisfy the aircraft requirements.

displayed as follows:.

9. Outer selector knob of

User Unit/Parameter

Display

MENU control - Turn until the first I/O port

ETA

ETA TIME DISPLAY

category (HEADING INPUT) display appears.

Distance Units

DISTANCE DISPLAY

(Refer to table 3-1.)

Speed Units

SPEED DISPLAY

Barometric Units

SELECT BARO UNITS

10. ENT key - Press to allow

Temperature Units

TEMP DISPLAY

configuration of the port.

Fuel Computation

Units

FUEL COMPUTATION

11. Inner selector knob of

MENU control -Turn to select the choice

4. ENT key - Press to change

setting (XYZ Magnetic-Synchro) for aircraft.

setting if displayed setting is incorrect.

12. ENT key - Press to save

5. Inner selector knob of MENU

the selection. -

control - Turn to select desired display setting

for applicable unit/parameter as follows:

13. Repeat steps 9 through 12

until all I/O port settings are programmed into

User Unit/Parameter

Display Selection

the aircraft as specified in table 3-1.

ETA

LOCAL or ZULU time

Distance Units

Nautical miles, kilo-

(d) Verifying and Programming

meters, or statue

User Units/Parameters.

miles

Speed Units

Knots, kilometers per

NOTE

hour, or miles per

hour

The

following

procedures

provide

Barometric Units

Inches or millibars

instructions for verifying the user

Temperature Units

Centigrade or

unit/parameter settings of the aircraft

Fahrenheit

and, if necessary, reprogramming the

Fuel Computation

RDU to obtain the desired setting(s).

Units

Gallons, imperial

The user unit/ parameter settings

gallons, kilograms

include:

Audio Level, Audio Tone

(avgas, jet-A or

Frequency, CDI Sensitivity, Estimated

JP-4), liters, or

Time

of Arrival (ETA), Position

pounds (avgas,

Coordinate System, Position Datum,

jet-A or JP-4)

Distance Units, Speed Units, Elevation

Units,

Barometric

Setting

Units,

6. ENT key

- Press to save

Temperature Units, Fuel Consumption

selected settings.

Units, Track Error Graphic, Display Light

Intensity for night vision goggles (NVG)

7. Inner selector knob of MENU

and Magnetic Variation (MAGVAR).

control

- Turn until SET AUDIO LEVEL is

displayed.

Unless otherwise specified, all control

settings are performed on the RDU.

3-32.20

Change 18

55-1620-210-10

8. Connect headset to pilot’s or

21. ENT key - Press to change

copilot’s ICS connector.

setting if display setting is incorrect,.

9. AUX switch on ICS - Set to

22. Inner selector knob of MENU

control - Turn to select

5.0,

2.5,

1.0,

0.3, or

0.1

nautical miles.

10. NAV VOL switch on VOR

control unit (AN/ARN-123 system)

- Deselect

23. ENT key - Press to save the

from OFF position.

display selection,

11. ENT key - Press and observe

24. Inner selector knob of MENU

that the following display appears:

control - Turn until SELECT USER UNITS, TURN

LARGE KNOB is displayed.

25. Outer selector knob of MENU

control - Turn until POSITION DISPLAY 1 display

appears.

12. Inner selector knob of MENU

26. If display setting is correct,

control - Turn to set comfortable audio level.

proceed to step 30.

13. Outer selector knob of MENU

27. ENT key - Press to change

control - Turn to set desired audio tone frequency.

coordinate system setting if display setting is

incorrect.

14. ENT key

- Press to save

s e t t i n g ( s ) .

NOTE

15. Inner selector knob of MENU

Coordinate systems available for

control - Turn until the following display appears:

selection are: latitude/longitude (L/L

(DDDMM.MMM)), latitude/ longitude

(L/L (DDMMSS.SW, Military Grid

Reference System (MGRS), Universal

Transverse Mercator/Universal Polar

Stereographic (UTM/UPS), British

National Grid (BNG), Irish Transverse

16. Outer selector knob of MENU

Mercator (ITM), and User Definable

control - Turn until INTERNAL CDI ADJUST

Coordinate (UDC).

display appears.

28. inner selector knob of MENU

17. ENT key - Press to change

control - Turn to select desired coordinate system.

setting if display setting is incorrect.

29. ENT key

- Press to save

18. Inner selector knob of MENU

position display 1 coordinate system selection.

control - Turn to select 5.0,

2.5,

1.0,

0.3, or

0.1

nautical miles.

30. Outer selector knob of MENU

control - Turn until POSITION DISPLAY 2 display

19. ENT key - Press to save the

appears.

display selection.

20. Outer selector knob of MENU

control

- Turn-until EXTERNAL CDI ADJUST

display appears.

Change 18

3-32.21

55-1520-210-10

NOTE

41. Outer selector knob of MENU

control - Turn until ELEVATION display appears as

The POSITION DISPLAY 2 selects a

follows:

secondary coordinate system that may

be displayed. If NONE is selected for

POSITION DISPLAY 2, then there will

be no secondary coordinate system

available for display.

42. ENT key - Press to change

setting if display setting is incorrect.

31. ENT key - Press to change

setting if display setting Is incorrect.

43. Outer selector knob of MENU

control - Turn to select ELEVATION field.

32. Inner selector knob of MENU

control - Turn to select NONE or the desired

44. Inner selector knob of MENU

coordinate system.

control - Turn to select feet or meters.

33. ENT key

- Press to save

45. Outer selector knob of MENU

position display 2 coordinate system selection.

control - Turn to select REFERENCE field.

34. Inner selector knob of MENU

46. Inner selector knob of MENU

control - Turn until SELECT USER UNITS, TURN

control

- Turn to select MN SEA LV (mean sea

LARGE KNOB is displayed.

level) or GEOD HT (geodetic height).

35. Outer selector knob of MENU

47. ENT key

- Press to save

control

- Turn until POSITION DATUM display

elevation units selection.

appears.

48. Inner selector knob of MENU

NOTE

control

- Turn until TRACK ERROR GRAPHIC

display appears:

Default datum is world datum WGS-

84. If another datum Is selected,

POSITION DATUM message appears

for approximately 5 seconds during

system power on sequence.

49. ENT key -

Press to change

selection if incorrect.

36. ENT key - Press to change

setting if display setting is Incorrect.

50. Inner selector knob of MENU

control - Turn to select YES or NO.

37. Outer selector knob of MENU

control - Turn to select datum symbol field or the

51. ENT key - Press to save

datum name field.

selection.

38. Inner selector knob of MENU

52. Inner selector knob of MENU

control - Turn to select desired datum.

control - Turn until SET DISPLAY INTENSITY

LEVEL display appears.

39. ENT key

- Press to save

position datum selection.

NOTE

40. Inner selector knob of MENU

Pressing ENT key will cause display to

control - Turn until SELECT USER UNITS, TURN

go to previously stored or lowest

LARGE KNOB is displayed.

intensity settings for NVG ENABLED

intensity settings.

3-32.22

Change 18

TM 55-1620-210-10

53. ENT key - Press and observe

59. ENT key - Press to change

that display changes as follows:

selection if display is incorrect.

60. Inner selector knob of MENU

control

- Turn to select AUTO, DEGREES, or

DEG + MIN.

NOTE

54. Inner selector knob of MENU

When the AN/ASN-175 is set to

control

- Turn counterclockwise until intensity of

MAGVAR: AUTO, it will auto-

key back-lighting is at a minimum.

matically enter the estimated magnetic

variation.

55. Outer selector knob of MENU

control - Turn counterclockwise until intensity of

61. Outer and inner selector knobs

display is at a minimum.

of MENU control - Turn to enter desired values if

DEGREES or DEG + MIN is selected.

56. Inner and outer selector knobs

of MENU control Turn to adjust key backlighting

62. ELT key

- Press to save

and display Intensity for optimum NVG levels.

selection.

57. ENT key

- Press to save

(11) AN/ASN-175 System Shutdown.

selection.

NOTE

58. Inner selector knob of MENU

The AN/ASN-175 system may be

control - Turn until MAGVAR display appears.

shutdown at any time without any risk

of damage.

(12) RDU power switch - Turn full counter-

clockwise to off position.

Change 18 3-32.23

TM 55-1529-210-10

Section IV. TRANSPONDER AND RADAR

3-25. Transponder Set AN/APX-72.

(4) MASTER control - NORM or LOW as

required.

a. Description. The AN/APX-72 provides radar

identification capability. Five independent coding

(5) IDENT - As required.

modes are available. The first three modes may

be used independently or in combination. Mode 1

(6) STOPPING procedure. MASTER control

provides 32 possible code combinations, any one

- OFF.

of which may be selected in flight. Mode

provides 4,096 possible code combinations but

d. Emergency Operation. MASTER control

only one is available since the selection dial is not

EMER.

available in flight and must be preset before flight.

Mode 3/A provides 4,096 possible codes, any of

3-26. Transponder Set AN/APX-100.

which may be selected In flight. Mode C is used

with the AAU-32/A Encoding Altimeter (AIMS).

a. Description.

The

transponder

set

Mode 4, which 6 connected to an external

AN/APX-100 enables the helicopter to identify itself

computer, can be programmed prior to flight to

automatically when properly challenged by friendly

display any one of many classified operational

surface and airborne radar equipment. The control

codes for security identification. The effective

panel enables the set to operate in modes 1, 2, 3A,

range depends on the capability of interrogation

4 and test. Mode 4 is operational when computer

radar and line of sight. The transponder control

KIT 1A (-1C)/ TSEC (classified) is installed, properly

set is mounted on the center pedestal. The IFF

coded, keyed, and IFF caution advisory light is not

CODE HOLD switch on the instrument panel

on. The range of the receiver-transmitter is limited

interfaces with MODE 4 (fig 2-4). This allows the

to line of sight transmission since its frequency of

crew to hold the classified operational code that

operation is in the UHF band making range dependent

has been programmed.

on altitude.

b. Controls and functions - Transponder Set.

b. Controls and Functions. Refer to figure 3-24.

Refer to figure 3-25.

c. Operation.

c. Operation - Transponder Set.

(1) MASTER control

- STBY. Allow

(1) MASTER control

- STBY. Allow

approximately 2 minutes for warmup.

(2) MODE and CODE - Select as required.

(2) MODE and CODE - As required.

(3) TEST M-1, 2, 3/A and C as required.

(3) MASTER control - NORM.

3-32.24

Change 18

(4) TEST - As required.

(5) ANT - As desired.

(2) If the REPLY light does not Illuminate

(6) IDENT - As required.

and/or the audio tone is heard, select the opposite code

(7) Stopping procedure. MASTER control -

(A or B) and repeat check.

OFF.

NOTE

Emergency Operation

Transponder Set

Further testing to check for correct coding

MASTER control - EMERG.

responses is done with ground test

equipment by moving the MASTER switch to

3-27.

Mode 4 Operation (APX-72 and APX-100).

NORMAL. either transponder does not

a. Before Exterior Check

respond to ground test interrogation the IFF

(1) IFF CODE HOLD switch (on the instrument

caution light should illuminate.

panel) - HOLD and check that the IFF CODE HOLD

indicator lamp is on.

e. Zeroizing MODE 4 codes may be accomplished

NOTE

in any one of the following methods:

If the IFF CODE HOLD switch is OFF and the MASTER

(1) CODE switch - ZERO.

switch is in any position other than OFF, MODE 4 codes

(2) MASTER switch - OFF.

will zeroize when the battery switch is turned off during

NOTE

the BEFORE EXTERIOR check.

If the switch is returned to NORMAL within 5

seconds, zeroizing may not occur.

*b. Aircraft Runup - Test: (APX-100 only)

(1) MASTER switch - STBY FOR 2 minutes.

(3) Aircraft electrical power - OFF.

(2) CODE switch - A.

NOTE

(3) Mode 4 or MODE 4 TEST switch ON.

If the IFF CODE HOLD switch (on the

(4) MODE

4 AUDIO/LIGHT/OUT switch

instrument panel) is at HOLD and the CODE

AUDIO.

switch has been moved to HOLD prior to

(5) MODE 4 TEST/ON/OUT switch (APX- 100)

removing electrical power, zeroizing will not

TEST momentarily.

occur.

c. AP,Y-72 --Test Response.

(4) Deleted.

(1) REPLY light should go on.

MODE 4 codes retained after engine shutdown.

(2) Audio tone should be heard.

(1) IFF CODE HOLD switch - ON and IFF code

(3) If the above indications do not occur, select

HOLD indicator lamp is on.

the opposite code (A or B) and repeat the check.

(2) CODE switch

- HOLD momentarily and

d. APX-100 - Test response

then release.

(1) REPLY light should go on.

(3) MASTER switch - OFF.

Change 17 3-37

TM 55-1520-210-10

(2) Abnormal Operation.

3-28. Altitude Encoder/Pneumatic Altimeter

(a) If the altimeters internal vibrator becomes

AAU-32/A.

inoperative due to internal failure or dc power failure, the

a. Description The AAU-32/A pneumatic counter-

pointer and drum may momentarily hang up when

drum-pointer altimeter is a self-contained unit which

passing from 9 through 0 (climbing) or from 0 thorough

consists of a precision pressure altimeter combined with

9 (descending). This hang-up will cause lag, the

an altitude encoder (fig 3-26). The display indicates and

magnitude of which will depend on the vertical velocity of

the encoder transmits. simultaneously, pressure altitude

the aircraft and the friction in the altimeter. Pilots should

reporting Altitude is displayed on the altimeter by a

be especially watchful for this type failure when the

10.000 foot counter, a 1,000 foot counter and a 100 foot

minimum approach altitude lies within the 8-1 part of the

drum. A single pointer indicates hundreds of feet on a

scale (800 to 1100, 1800 to 2100, etc).

circular scale, with 50 foot center markings. Below an

(b) If the CODE OFF flag is visible, the dc power is

altitude of 10,000 foot a diagonal warning system will

not available, the circuit breaker is not in, or there is an

appear on the

10.000 foot counter. A barometric

internal altimeter encoder failure.

pressure setting knob Is provided to insert the desired

altimeter setting In inches of Hg. A dc powered vibrator

within 70 feet of the field elevation (with proper local

operates inside the altimeter whenever the aircraft power

barometric setting) the altimeter needs rezeroing or there

is on. If dc power to the altitude encoder is lost, a

has been an internal failure.

warning flag placarded CODE OFF will appear in the

(d) If the baroset knob binds or sticks. abnormal

upper left portion of the instrument face indicating that

force should not be used to make the setting as this may

the altitude encoder is inoperative and that the system is

cause internal gear failure resulting in altitude errors.

not reporting altitude to ground stations. The CODE

Settings can sometimes be made by backing off and

OFF flag monitors only the encoder function of the

turning at a slower rate.

altimeter. It does not indicate transponder condition.

The AIMS altitude reporting function may be inoperative

3-29.

Proximity Warning System YG-1054.

without the AAU-32/A CODE OFF flag showing, In

a. Description The proximity warning transponder,

case of transponder failure or improper control settings

control panel located at the forward left side of the

It is also possible to get a ’good’ MODE C test on the

pedestal, operates at frequency 5.08 GHz. The system

transponder control with the CODE OFF flag showing.

provides audio and visual intruder indications of similarly

Display of the CODE OFF flag only indicates an encoder

equipped aircraft within 5,000 feet laterally and 300 feet

power failure or a CODE OFF flag failure. In this event.

vertically. Vertical operation is influenced by barometric

check that dc power Is available and that the circuit

pressure from the helicopters pitot static tube.

breakers are in. If the flag is still visible, radio contact

b. Controls and Functions. Refer to figure 3-28.

should be made with a ground radar site to determine

c. Operation.

whether the AIMS altitude reporting function is operative,

(1) POWER switch - ON

and the remainder of the flight should be conducted

(2) Test - CONFIDENCE TEST.

accordingly.

(3) RANGE SELECT - As desired.

b. Operation.

(4) LIGHT INTENSITY - As desired.

(1) Normal Operation. The AIMS altimeter circuit

(5) AUDIO Adjust.

breaker should be closed prior to flight, the Mode C

(6) POWER - OFF

switch (M-C) on the transponder control should be

switched to ON for altitude reporting during flight. The

AAU-32.’A altimeter indicates pneumatic altitude

reference to the barometric pressure level as selected by

the pilot. At ambient pressure, altimeters should agree

with ±70 feet of the field elevation when the proper

barometric pressure setting is set in the altimeter. A red

flag marked CODE OFF is located in the upper left

portion of the altimeters face In order to supply Mode C

information to the IFF transponder, the CODE OFF flag

must not be visible. A vibrator, powered by the dc

essential bus, is contained In the altimeter and requires a

minimum of one minute warmup prior to checking or

setting the altimeter

3-38 Change 17

TM 55-1520-210-10

3-30. Radar Warning Set.

a Description The radar warning set AN/APR-39

provides the pilot with visual and audible warning when a

hostile fire-control threat is encountered. The equipment

responds to hostile fire-control radars but nonthreat

radars are generally excluded. The equipment also

receives missile guidance radar signals and, when the

signals are time-coincident with a radar tracking signal,

the equipment identifies the combination as an activated

hostile surface to air (SAM) radar system. The visual

and aural displays warn the pilot of potential threat so

that evasive maneuvers can be initiated.

To prevent damage to the receiver detector crystals,

assure that the AN/APR-39V-1 antennas are at least 60

meters from active ground radar antennas or 6 meters

from active airborne radar antennas. Allow an extra

margin for new, unusual or high power emitters.

PWR switch - ON, allow I-minute for warmup.

BRIL and filter controls - Adjust as desired.

AUDIO control - Adjust volume as desired.

DSCRM switch - Set for mission requirement.

Stopping Procedure - PWR switch - OFF.

Change 17 3-41

TM 55-1520-210-10

3-31. V Radar Altimeter - AN/APN-209.

altitude warning bug to 80 feet by turning LO SET control

a. Description. The radar altimeter set is a high

knob clockwise. Set the high altitude warning bug to 800

resolution pulse radar that provides an medication of

feet by turning the HI SET control knob clockwise. The

absolute clearance over all types of terrain. The set

indicators should display a track condition within two

consists of the following:

a panel mounted height

minutes from the time indicator was turned on. The OFF

indicator receiver transmitter (located on copilot

flag should disappear from view; the pointer read 0 to 3

instrument panel); a panel mounted remote height

feet; the digital display -0 to +3 feet; and the LO warning

indicator (located on pilot instrument panel), and two

lamp illuminate. Press and hold the HI SET control knob

flush mounted antennas on the underside of the

(push to test operation). The indicator pointer and digital

helicopter. The controls and displays of the height

display should read 1000 +100 feet; the LO warning lamp

indicator receive-transmitter (IRT) and the remote height

should be off and the HI warning lamp on.

indicator (RI) are identical (see Figure 3-27). Absolute

altitude is displayed by a pointer and a digital readout.

NOTE

The pointer operates against a fixed dial and indicates

When using an unmodified indicator

tens of feet between 0 to 200 feet, and hundreds of feet

during NVG flight, turn the HI/LO and

between 200 to 1500 feet. Above 1500 feet the pointer is

DIGITAL switch to OFF. Use the height

driven behind a mask. The digital display has a four digit

needle lite by the eyebrow light The

readout. The readout is displayed in one foot increments

modified indicator will work as advertised.

up to 255 feet. At 256 feet the display is rounded up to

260 feet. Between 260 and 1500 feet the readout is

(2) Normal Operation Adjust LO SET control

displayed in tens of feet. The LO SET control knob

knob to desired setting for low altitude warning bug. The

functions as the on-off switch and is the low altitude trip

LO warming lamp will illuminate when indicated altitude

point adjustment. Clockwise rotation turns the set on.

drops below this setting. Adjust HI SET control knob to

Continuing a clockwise rotation provides for the setting of

desired setting for high altitude warning bug. The HI

the low altitude bug. The HI SET control knob provides

warning lamp will illuminate when indicated altitude goes

for the setting of the high altitude bug. Depressing the HI

above the high altitude warning bug setting. For daylight

SET control knob places the altimeter set m the self-test

operations, set the pilot instrument lighting control

mode. The IRT sends a simulated signal of 1000 feet to

(overhead console) to OFF. This setting provides

both mediators. The indicators display the information

lighting at full brightness to the warning lamps and digital

via the pointer and digital readout. Whenever the

displays on both indicators. Turning the instrument

indicated altitude drops below the low altitude bug setting

lighting controls (pilot and copilot) controls clockwise

the LO altitude warning lamp is activated. Whenever the

dims the indicator lighting. In the event of loss of track

indicated altitude goes above the high altitude bug

due to helicopter attitude (30 degrees pitch or 45 roll) or

setting, the HI altitude warning lamp is activated. When

to operation beyond the range of the altimeter, the

the LO SET control knob is turned to OFF, or during

altitude pointer swings behind the no-track mask and the

periods of unreliable operation, the OFF flag comes into

digital readout is totally blanked. In addition, the OFF

view.

flag comes into view.

b. Operation The following procedures apply to

(3) Stopping Procedure Turn LO SET control

both indicators (IRT on copilot instrument panel, and RI

knob (on each indicator) fully counterclockwise.

on pilot instrument panel). Accomplish procedures using

controls on each indicator.

(1) Initial Operation Turn the IRT and RI on by

Turing the LO SET control knob clockwise. Set the low

3-42 Change 17

TM 55-1520-210-10

3-32. Receiver-Transmitter Radio, RT-1167/ARC-

3-33. Receiver-Transmitter

Radio,

RT-1167C/

164(V).

ARC-164(V).

Receiver-Transmitter Radio RT-1167/ARC-164(V)

(figure

3-3.1) is an airborne, ultra-high frequency

Receiver-Transmitter Radio RT-1167C/ARC-164(V)

(UHF), amplitude-modulated (AM), radio transmitting-

has the same functions and capabilities as the RT-

receiving (transceiver) set. It contains a multichannel,

1167/ARC-164(V) plus a HAVE QUICK mode of

electronically-tunable transceiver and a fixed-tuned

operation. HAVE QUICK is an antijamming mode

guard receiver. The transceiver operates on any one

which uses a frequency hopping scheme to change

of 7,000 channels spaced in 0.025 MHz units in the

channels many times per second. Because the HAVE

225.000 to

399.750 MHz UHF military band. The

QUICK mode depends on a precise time of day, both

guard receiver is tunable in the 238.000 to

248.000

HAVE QUICK radios must have synchronized clocks.

MHz frequency range with crystal replacement and

realignment (usually

243.000 MHz). The radio set

A-3-2-T Knob (HAVE QUICK ONLY)

primarily is used for voice communication. An addition-

al radio set capability, although not functional is ADF.

A- Selects AJ mode.

Power to operate the ARC-164(V) radio is from the 28

3- Allows manual selection of frequencies.

vdc emergency bus through a circuit breaker marked

2- Allows manual selection of frequencies.

UHF-AM on the pilot overhead circuit breaker panel.

T - Momentary position which enables the radio

to accept a new TOD for up to 60 seconds after selec-

tion. Also used in conjunction with the emergency

startup of the TOD clock when TOD is not available

from a external source.

TONE Button (Have Quick) - Depressing the TONE

button in normal or AJ modes interrupts reception and

transmits a tone signal and TOD on the selected fre-

quency. Simultaneously pressing the TONE button in

conjunction with the A-3-2-T knob in the T position

starts the emergency startup of the TOD clock.

HAVE QUICK System - The HAVE QUICK (HQ)

system provides a jam resistant capability through a

frequency hopping technique. Frequency hopping is a

technique in which the frequency being used for a

given channel is automatically changed at some rate

common to the transmitter and receiver. The jam

resistance of the system is due to the automatic fre-

quency changing and the pseudorandom pattern of

frequencies used. In order to defeat this communica-

tions system, the jammer must find the frequency

being used, jam it and then predictor find the next fre-

quency. The HAVE QUICK modification adds the fre-

quency hopping capability, yet it does not remove any

of the previous capabilities of the radio. The HAVE

QUICK modified radios retain the standard, single fre-

quency UHF voice mode of operations. This is

referred to as the normal mode, while frequency hop-

ping operation is called the anti-jam (AJ) mode.

Several ingredients are necessary for successful sys-

tem operations. These are:

1. Common frequency

2. Time synchronization.

3. Common hopping pattern and rate.

Figure

3-29.1. Receiver-Transmitter Radio,

4. Common net number.

RT-1167/ARC-164(V)

3-44

Change

TM 55-1520-210-10

The common frequencies have been programmed into

back to the A position. A TOD update (time tick) can

all HAVE QUICK radios. Time synchronization is

be received on the selected AJ net.

provided via UHF radio and/or hardware by external

time distribution system. A time-of-day (TOD) signal

Net Numbers - After WOD and TOD are entered,

must be received from the time distribution system for

any valid AJ net number can be selected by using the

each time the radio is turned on. The hopping pattern

manual frequency knob.

and hopping rate are determined by the operator in-

serted word-ofday (WOD). The WOD is a multi-digit

Anti-Jamming Mode Operation - A tone is heard in

code, common worldwide to all HAVE QUICK users.

the headset if an invalid AJ net is selected, it TOD was

In the AJ mode, a communications channel is defined

not initially received, or if WOD was not entered. If the

by a net number instead of a signal frequency as in

function knob is set to both and the AJ mode is

the normal mode. Before operating in the AJ mode,

selected, any transmission on the guard channel takes

the radio must be primed. This consists of setting the

precedence over the AJ mode.

WOD, TOD, and net number. The AJ mode is then

selected by placing the A-3-2-T knob to A.

Operational Procedures - Radio Set AN/ARC-164(V)

WORD OF DAY (WOD) - The WOD entry is nor-

1. Transfer WOD IAW “WOD TRANSFER” para-

mally entered before flight, but it is possible to enter it

graph.

in flight. WOD is entered by using one or more of the

2. Setup RT to receive TOD:

six preset channels which are 20-15. For a new WOD

a. With external TOD equipment:

entry, start at channel 20 use the same method as in

(1)

Select manual mode on MODE switch.

entering preset frequencies in the normal mode with

(2)

Set TOD frequency in manual frequen-

the frequency knobs and the PRESENT button. After

cy windows.

each entry, a single beep is heard until channel

(3) Set A-3-2-T to A, after TOD beep is

entry; a double bee is heard indicating that the radio

has accepted all six WOD entries.

heard. If tone is heard with the A-3-2-T

in the A position, reinitialize radio IAW

WOD TRANSFER - Select the preset mode and,

steps in “TOD TRANSMISSION” para-

starting with present channel 20, rotate the preset

graph.

knob CCW. At channel 20, a single beep is heard. A

b. Without external TOD equipment:

single beep indicates that channel

20 data has been

Emergency start-up of TOD clock:

transferred and accepted. After the single beep is

(1) Set and hold A-3-2-T switch to T.

heard, select remaining channels

(19-15) in the same

(2) Press the TONE button.

manner until a double beep is heard indicating the

WOD transfer is complete.

NOTE

TIME-OF-DAY (TOD)

- Transmission

- The TOD

entry is normally entered before flight, but it is possible

When using this method, the flight com-

to enter it in flight. It is possible to transmit timing infor-

mander or lead aircraft should emergency-

mation in both normal and AJ modes by momentarily

start his TOD clock. Lead aircraft would

pressing the TONE button. In the normal mode, a

then transfer TOD to other aircraft in flight.

complete TOD message is transmitted, while in the AJ

Aircraft using this method will not be able to

mode, only an abbreviated time update is transmitted.

communicate with valid TOD signal in the

A mode time transmission allows a time update if one

AF mode. A valid TOD signal must be

radio has drifted out of synchronization.

transferred to all aircraft that have invalid

TOD time before effective AJ communica-

TIME-OF-DAY Reception - Reception is possible in

tions can be achieved.

both normal and AJ modes. The radio automatically

accepts the first TOD message after the radio is

turned on and WOD transferred. Subsequent mes-

HAVE QUICK Checklist ARC-164. Loading Word-

sages are ignored unless the T position is selected

of-Day (WOD).

with the A-3-2-T knob. The radio then accepts the next

TOD update in either normal or AJ mode, provided the

1. “T, 2,3, A'' switch - Not in A position.

TOD update arrives within 60 seconds of the time the

2. Functional selector switch - Both.

T position has been selected. To receive time in the

3. Manual, preset, guard switch

- Preset.

normal mode, rotate the A-3-2-T knob to the T position

4. Manual frequency display

- Set WOD

15.

and return to a normal channel in either the manual or

5. Preset channel select- Set to

15.

preset mode. To receive a time update in AJ mode,

6. Preset button (under frequency cover) - Press

rotate the A-3-2-T knob to the T position and then

7. Manual frequency display - Set WOD 16.

Change

3-45

TM 55-1520-210-10

8. Preset channel select-Set to

16.

CONTROL

FUNCTION

9. Preset button

- Press.

10. Repeat steps 7 thru 9 to store WOD 17, 18,

Frequency selector

Selects 10’s digit of

19.

switch

frequency (0 through 9) in

11. Manual frequency display - Set

300.050.

MHz.

12. Preset channel select - Set to

20.

Frequency selector

Selects units digit of

13. Preset button

- Press.

switch

frequency (0 through 9) in

14. Rotate preset select down

19,

18,

17,

16,

15,

MHz.

(hear 1 beep 20-16, 2 beeps on 15).

Frequency selector

Selects tenths digit of

Receiving Time from Net Control Aircraft.

switch

frequency (0 through 9) in

1. Manual, preset, guard switch - Manual.

MHz.

2. Set to internal frequency to receive the time.

3. Hear net control aircraft state: “Standby for

Frequency selector

Select hundredths and

time.”

switch

thousandths digits of fre-

4. Rotate “T, 2,3, A“ switch to ”T'' and return to

quency

(00,25,50, or

75) in

established manual frequency, hear.

MHz.

5. Hear net control aircraft state: “Go active

point one.”

Preset channel

Selects one of 20 preset

selector switch

channels.

6. Set A00.100 in manual window and complete

commo check; if loud tone is heard, repeat

MANUAL-PRESET-

Selects method of frequency

timing.

GUARD selector

selection.

Sending Time (Net Control Aircraft)

MANUAL

Any of 7,000 frequencies is

1. Manual, preset, guard switch - Manual.

manually selected using the

2. Set to internal frequency.

five frequency selector

3. Rotate “T, 2,3, A“ switch to “T’' and hold.

switches.

4. Press tone button and hold (hear no tone).

5. “T, 2,3, A'' to internal frequency (.25 second

PRESET

A frequency is selected

beep, then tone).

using the preset channel

6. Call other aircraft to send time.

selector switch for selecting

7. Press tone button to send time.

any one of 20 preset

channels as indicated on the

CHAN indicator.

NOTE

GUARD

The main receiver and

Recall today’s WOD by reselecting presets

transmitter are

20 down thru 15, and hear beeps.

automatically tuned to the

guard frequency. Blocks

3-34. Antenna.

out any frequency set either

manually or preset.

The UHF-AM antenna (figure 3-1) is located on the

SQUELCH ON-OFF

Turns squelch of main

bottom center fuselage area and is mounted directly

switch

receiver on or off.

aft of the doppler fairing.

VOL control

Adjusts volume.

3-35. Controls and Functions (RT-1167).

TONE switch

Enables transmission and

Controls for the ARC-164(V) are on the front panel

headset monitoring of a

of the unit (figure 3-29.1). The function of each control

1.020-Hz tone on selected

is as follows:

frequency for maintenance

check only.

CONTROL

FUNCTION

Frequency selector

Selects 100’s digit of fre-

switch 1

quency (either 2 or 3) in

MHz.

3-46

Change 7

TM 55-1520-210-10

CONTROL

FUNCTION

(2) Set

MANUAL-PRESET-GUARD selector

switch to MANUAL for manual frequency selection or

Mode selector switch

Selects operating mode:

to PRESET for preset channel selection.

OFF

Turns power off.

(3) To manually select a frequency, rotate the five

MHz selector switches until desired frequency is dis-

played in indicator window.

MAIN

Enables the transceiver.

BOTH

Enables transceiver and

NOTE

guard receiver.

Clockwise rotation of the MHz selector

switches increases frequency.

ADF

Not operational.

(4) To select a preset channel, rotate preset chan-

3-36. Controls and Functions (RT-1167C).

nel selector switch until desired channel is displayed

in preset CHAN indicator window.

The controls and functions of the RT-1167C/ARC-

164(V) are identical to the RT-1167/ARC-164(V) with

NOTE

the exception of the following:

Clockwise rotation of preset channel selec-

CONTROL

FUNCTION

tor switch will increase the

desired channel

number (1 to 20).

Frequency selector

Selects 100’s digit of fre-

switch 1 (T-2-3-A)

quency (either 2 or 3) in

c. Transmit/Receive/Guard

Monitor (BOTH)

MHz. The A position selects

Mode.

the HAVE QUICK mode.

The T position (spring-

Ioaded) allows the radio to

(1) Set OFF-MAIN-BOTH-ADF

selector switch to

receive a new time of day.

BOTH.

3-37. Modes of Operation.

NOTE

The BOTH position turns on the transceiver

Depending on the settings of the operating controls,

and the guard receiver. The guard receiver

the radio set can be used for these modes of opera-

will remain turned to 243 MHz regardless of

tion:

manual or preset frequencies selected.

a. Control (Mode) Settings.

(2) Select desired manual frequency or preset

channel (paragraph 3-37b (3) and

(4)).

(1) MAN mode: two-way voice communications.

NOTE

(2) BOTH mode: utilizing the transceiver constant

monitoring of guard receiver without losing the use of

If reception on the selected frequency inter-

the transceiver.

feres with guard reception; detune the set

by selecting an open frequency or place

(3) Transmission of

1,020 Hz TONE signal.

MANUAL-PRESET-GUARD selector switch

to GUARD.

b. Transmit/Receive (MAIN) mode.

1020 Hz TONE Signal Transmission (MAIN)

(1) Set OFF-MAIN-BOTH-ADF selector switch to

mode.

MAIN.

(1)

Set OFF-MAIN-BOTH-ADF selector switch to

MAIN.

Change 7

3-47

TM 55-1520-210-10

(2) Select a desired frequency for TONE trans-

(5) Press and release PRESET switch. Preset fre-

mission. Refer to steps 3-37b (3) and (4).

quency is now loaded into memory.

(3) Push the TONE switch to transmit the 1020 Hz

3-39. VOICE SECURITY SYSTEM TSEC/KY-58.

signal.

The TSEC KY-58 provides secure voice (ciphony)

NOTE

on the pilot’s VHF FM radio. The pilot uses the KY-58

remote control unit (RCU) located in his right-hand

Tone-modulated signal may be used to

console to operate the TSEC/KY-58, which in turn

check out the radio set and isolate faulty

controls the AN/ARC-186(V) (FM No.1) radio set (also

microphone circuitry.

located in the right-hand console). Power to operate

the TSEC/KY-58 comes from the

28-vdc emergency

bus through a circuit breaker labeled KY-58 on the

e. HAVE QUICK mode (RT-1167C only).

pilot overhead circuit breaker panel. Two operating

modes are available: PLAIN mode for in-the-clear

The HAVE QUICK mode can be activated in one of

voice transmission or reception, and C/RAD

1 (cipher

two ways:

mode for secure radio transmission or reception.

(1) Set MANUAL-PRESET-GUARD switch to

NOTE

MANUAL and set frequency selector switch 1 to A.

The TSEC/KY-58 POWER switch must be

(2) Set MANUAL-PRESET-GUARD switch to

set to ON and the KY-58 circuit breaker

PRESET and set preset channel selector switch to

must be closed before VHF No. 1 radio

channel

20.

communication (plain or ciphered) is pos-

sible.

3-38. Operational Procedures Radio Set AN/ARC-

164.

3-40. Controls and Functions.

a. Guard (Emergency) Operation.

Voice security system controls that require adjust-

ment by the pilot include those on Z-AHQ Power Inter-

(1) Set

MANUAL-PRESET-GUARD selector

face Adapter (located in the aft avionics bay), the

switch to GUARD.

Z-AHP KY-58 Remote Control Unit (located in the

pilot’s right-hand console), and the TSEC/KY-58 (also

NOTE

located in the pilot’s right-hand console). Each of

these devices is shown in figure 3-14. The function of

Transmission on guard frequency will also

each control and indicator is as follows:

occur with transceiver manual frequency or

preset channel tuned to the guard frequen-

Z-AHQ POWER INTERFACE ADAPTER

cy.

CONTROL OR INDICATOR

FUNCTION

b. Loading Preset Channels.

BBV, DPV, BBN, DPN

Set according to type of

4-position

switch

radio being secured. Set

(1) Use the manual frequency selector switches

to BBV for pilot’s VHF

to select the frequency to be placed into memory.

FM radio.

(2) Set

MANUAL-PRESET-GUARD selector

PTT button

Clears crypto alarm that

switch to PRESET.

(push-to-talk)

occurs upon power up.

Alarm can also be

(3) Turn preset channel selector switch to the

cleared by pressing any

desired channel number.

push-to-talk switch in

the pilot compartment.

(4) Raise switching unit cover.

3-48

Change 7

TM 55-1520-210-10

Z-AHQ POWER INTERFACE ADAPTER (cont)

Z-AHP REMOTE CONTROL UNIT

CONTROL OR INDICATOR

FUNCTION

CONTROL OR INDICATOR

FUNCTION

FILTER lN/OUT

Prevents adjacent

MODE Switch

Set to OP (operate) to

Selector

channel interference

use pilot’s VHF radio in

when using radios with

either the Ciphered or

channel spacing of 25

Plain mode. Set to LD

kHz. Must be set to IN

(load) when installing

for pilot’s AN/ARC-

crypto-net variables

186(V) VHF-FM radio.

(CNV) in the TSEC/

KY-58 (TM

11-5810-262-

Z-AHP REMOTE CONTROL UNIT

12&P). Set to RV

(receive variable)

CONTROL OR INDICATOR

FUNCTION

during manual remote

keying (TM

11-5810-262-

REM/LOC Switch

Sets the Z-AHQ to the

12&P).

local mode. Switch

returns to REM (remote)

POWER

Turns KY-58 on and off.

position upon release,

Switch must be on (up) for

but equipment remains

operation in either plain

in local mode until any

or cipher mode.

PTT is keyed.

FILL switch

Selects desired crypto-net

ZEROIZE switch (two-

Use in an emergency to

variable (CNV).

position toggle switch

delete all crypto-net

housed under a spring-

variables (CNVs) from

TSEC/KY-58

Ioaded cover)

KY-58 registers. Ren-

ders KY-58 unusable

CONTROL OR INDICATOR

FUNCTION

until new variables are

loaded.

VOLUME control

Sets audio level of pilot’s

VHF-FM radio.

DELAY Switch

Introduces time delay

that is necessary when

MODE switch

Set to P (Plain) to operate

secure signal from

pilot’s VHF-FM radio in

pilot’s VHF-FM radio is

the clear. Set to C

to be retransmitted by

(Cipher) to operate pilot’s

receiving station.

VHF-FM radio in the

Switch is normally in

ciphered (secure speech)

the down (off) position.

mode. Set to LD (load)

when installing crypto-

C/RAD 1/PLAIN switch

Set switch to C/RAD 1

net variables (CNV) in

(cipher radio 1) to use

the TSEC/KY-58 (TM 11-

secure voice. Set switch

5810-262-12&P). Set to

to PLAIN when

RV (receive variable)

operating radio in the

during manual remote

clear.

keying (TM

11-5810-262-

12&P).

Switch guard

Rotate to the left to

prevent C/RAD 1/

FILL connector

Used to load crypto-net

PLAIN switch from

variables (CNV’S) into the

accidentally being set to

TSEC/KY-58 registers

PLAIN.

(TM

11-5810-262-12&P).

Change

3-49

TM 55-1520-210-10

TSEC/KY-58 (cont)

(6) Set the Z-AHQ Power Interface Adapter FIL-

TER selector to IN.

CONTROL OR INDICATOR

FUNCTION

(7) Place the DELAY switch on the Z-AHP

FILL switch

Pull knob and set to Z1-5

Remote Control Unit (RCU) in the down (off) position.

to zeroize (delete) crypto-

net variables (CNV’s) in

(8) Set the C/RAD 1 -PLAIN switch on the Z-AHP

TSEC/KY-58 registers

Remote Control Unit (RCU) to the C/RAD 1 position.

5.Set to 1, 2, 3, 4 or 5 to

select desired CNV. Pull

(9) Set the MODE switch on the Z-AHP Remote

knob and set to Z-ALL to

Control Unit (RCU) to the OP position.

zeroize (delete) crypto-net

variables (CNV’s) in all

(10) Set the FILL switch on the Z-AHP Remote

TSEC/KY-58 registers.

Control Unit (RCU) to the proper crypto-net variable

Zeroizing all registers

(CNV).

renders TSEC/KY-58

unusable.

(11) Set the POWER switch on the Z-AHP

Power switch

Set to OFF to turn off both

Remote Control Unit (RCU) to the ON position.

the TSEC/KY-58 and the

pilot’s VHF-FM radio.

NOTE

Set to ON to operate the

TSEC/KY-58 and pilot’s

At this time you should hear and intermit-

VHF-FM radio. Set to TD

tent tone and backg0round noise. The back-

(time delay) when secure

ground noise is normal. The tone is a

voice from pilot’s VHF-FM

crypto alarm that must be cleared before

radio is to be retransmitted.

the radio can be used. If step 12 does not

clear the intermittent tone, double check

3-41. Operation.

steps 1 through 11. If necessary, refer to

11-5810-262-OP.

Preliminary Operation.

(12) Press and release the ICS switch on the pilot

NOTE

cyclic stick or the pilot’s push-to-talk floor switch. This

should clear the crypto alarm.

Before the pilot’s VHF-FM radio may be

operated in ciphered (secured voice) mode,

b. Cipher Mode.

it must be loaded with one or more crypto-

net variables (CNV’s). Refer to TM

11-

(1) After steps 1 through 12 (above) are complete,

5810-262-12&P for complete details on

the radio is ready to transmit and receive secure

loading these variables.

speech in ciphered mode.

(1) Set the TSEC/KY-58 Power switch to ON.

(2) To transmit, press any push-to-talk switch. You

may begin speaking following the beep.

(2) Set the TSEC/KY-58 MODE switch to C

(cipher).

c. Plain Mode.

(3) Set the TSEC/KY-58 VOLUME control to a

(1) To transmit and receive in the clear, set the

comfortable listening level.

C/RAD 1/PLAIN switch on the Z-AHP Remote Control

Unit to PLAIN.

(4) Set the TSEC/KY-58 FILL switch to any one of

the numbered storage register positions

(1-6).

(2) To transmit, press any push-to-talk switch. You

may begin speaking immediately.

(5) Set the Z-AHQ

Power Interface Adapter 4-

position switch to BBV.

3-50

Change 7

55-1520-210-10

d. Automatic Remote Keying (AK).

you to set your RCU FILL switch to position 6, and

stand by while the MK operation is repeated.

NOTE

3-42. Voice security System TSEC/KY-28.

Automatic Remote Keying (AK) causes an

old crypto-net variable in one of the

Not installed.

TSEC/KY-58 registers to be replaced by a

new one, or an empty register to be filled.

Your net controller simply transmits the new

CNV to your TSEC/KY-58

(1) Your net controller will contact you by using a

secure voice channel, and tell you to wait for an AK

transmission. You must not transmit during this peroid.

(2) You will hear one or two beeps in your headset

when the AK occurs.

e. Manual Remote Keying (MK).

NOTE

Manual Remote Keying (MK) requires you

to use the Z-AHP Remote Control Unit to

change crypto-net variables (CNV’s).

(1) The net controller will contact you by using a

secure voice channel. He will tell you to stand by for a

new or replacement CNV and that you will use an MK

action.

(2) Set the Z-AHP RCU FILL switch to position

Notify the net controller by radio when you have done

this and stand by.

(3) The net controller will tell you to set the Z-AHP

RCU MODE switch by RV (receive variable). Notify

the net controller when you have done this and stand

by.

(4) When notified by the net controller, set the Z-

AHP RCU FILL switch to the storage position selected

to receive the CNV. Notify the net controller when you

have done this, and stand by.

(5) The net controller will ask you to listen for a

beep, wait two seconds, and set the Z-AHP RCU

MODE switch to OP (operate).

(6) If the MK operation was successful, the net

controller will contact you via the new CNV. If the MK

operation was not successful, the net controller will

contact you by a clear voice (plain) transmission, tell

Change 7

3-51

TM 55-1520-210-10

3-43.

#2 VHF-FM-COMM AN/ARC-201.

(3) The

#2 VHF-FM Comm AN/ARC-201 consists

of a Receiver-Transmitter Radio, Panel Mounted (RT-

a. Description. The #2 VHF-FM Comm AN/ARC-

1476).

201 provides VHF-FM radio communications of voice

data, secure or plain text, in single channel (25 KHz)

3-44. HF-SSB RADIO SET AN/ARC-199.

and the SINOGARS ECCM mode of operation. The

frequency range is

30 to

87.975 MHz channelized in

a. Description. The AN/ARC-199 is a high fre-

tuning increments of 25 KHz.

quency, single-side band radio set. It operates in

2.0

29.999 MHz frequency range using

280,000 chan-

(1) In addition, a frequency offset tuning capability

nels separated by 100 Hz steps. The AN/ARC-199 is

of -10 KHz, -5 KHz +5 KHz and +10 KHz is provided

capable of for retransmission of data or voice. The

in both receive and transmit mode. This capability is

system is capable of scanning any or all channels

not used in the ECCM mode. Ninety-nine percent of

once they have been programmed on the scanned list.

the emitted spectrum of analog and digitized voice

(16

Kbs;) and data is contained within a 25 Khz channel.

b. Display Fields, Control Knobs and Functions.

Refer to Figure 3-29.2.

(2) The #2 VHF-FM Comm AN/ARC-201 will pro-

vide independent FM Communications only. It will be

interfaced with

#1 VHF-FM Comm/Homing AN/ARC-

201 for operation in the retransmit mode.

Figure 3-29.2 Control-Display Panel Layout

3-52

Change

TM 55-1520-210-10

Field/Functioning of Control-Display Panel

CONTROL/

INDICATOR

FUNCTION

Channel - This field appears in inverse video to indicate that current channel

information has not been stored.

Active channel number:

0-20.

Modulation Mode: USB, LSB, AM, CW. CW represents MCW and may be used

in conjunction with the mic key to transmit code.

Receive frequency in kilohertz.

Transmit frequency in kilohertz.

Squelch Level - Display MIN, 1,2,3

13, 14, MAX in conjunction with squelch

knob in control panel.

Receive Selective Address.

Transmit Selective Address. In the sample display shown above, ON indicates

that SELADR mode is operational for RX. If SELADR is operational for TX, ON

is annunciated on the line with TX.

Transmitter Output Power - LOW, MED, or HI.

10.

Modulation Source: The displays are:

DATA

Indicates 600 ohm data input.

CIPHER Indicates input form KY 75 input.

CLR-VC Indicates non-encrypted KY

75 input.

11.

Fault Field: Display fault messages, NOT TUNED, DATA NOT SAVED, and AUDIO

VOLUME LEVEL: VOL MIN

1,2,3

14, MAX.

12.

S: Indicates that the currently displayed channel is on the scan list.

13.

Indicates are: XMIT, TEST, SCAN, TUNE.

XMIT - transmitter is keyed & channel is tuned.

TEST - Built-in-test mode is active.

SCAN - Scan mode is active.

TUNE - Tuning for one or all channels - blank if not one of the above.

Change

3-53

TM 55-1520-210-10

Field/Functioning of Control-Display Panel (Cont)

CONTROL/

INDICATOR

FUNCTION

14.

K- Indicates KEY has been pressed, and the functions above the keys are active.

M - Indicates MODE has been pressed, and USB, LSB, AM, or CW should be

selected next. Indicates slewing may be used, or scan flag may be set or

cleared.

CONTROL PANEL KNOBS

15.

Function Select - Power ON/OFF, CRT brightness, audio volume and channel

number selection.

16.

Function - Control - Single-step, detent-type switch, with continuous rotation in

either direction. Clockwise rotation increases, and counterclockwise rotation

decreases the CRT brightness, audio volume, or channel number. In cases of

CRT brightness and audio volume, knob has no effect once limit of that particular

function has been reached. In channel select mode, function control knob is

continuously active. That is, channel 20 is always one position counterclockwise

from channel

17.

Squelch Control - Continuous rotation in either direction; squelch level is

annunciated in field #6. Once upper or lower limit of squelch has been reached,

further rotation of knob in same direction has no effort.

c. Operating Modes/Functions.

(4) Audio Volume. Set Function Select Knob to

VOL, rotate the function Control Knob in the desired

(1) Power ON/OFF. On function Select Knob .Ref-

direction to increase or decrease audio volume. Audio

erence no. 15 on control panel la.out..

volume is not a stored parameter. Audio volume level

is annunciated briefly in the fault area of the display

when the level is being changed. The display levels

(2) Ready indication. When the radio is initially

are: MIN, 1,

14. MAX. A secondary HF audio

powered on, a system ready message will be dis-

volume control is located in the lower left console. See

played for a few seconds. The channel

0 information

figure

3-11.2. This is provided for audio level com-

will then be displayed.

patibility with the KY-75. Preset the CDU VOL level to

the max. position and adjust the secondary volume

(3) CRT brightness. Set Function Select Knob to

control for the desired level.

BRT. Rotate the Function Control Knob in the desired

direction to increase or decrease brightness.

3-54

Change

TM 55-1520-210-10

(5) Channel Number. Channel number may be

(10) Transmit Selective Address. A

4-letter code

changed using the Function Select and Function Con-

programmed by pressing .HE KEY + SEL TX + a 4-let-

trol Knobs or by using a combination of keystrokes.

ter code + ENT. Transmit selective address mode is

activated with key sequence, KEY + SEL RX + ON +

(6) Modulation Mode. Four modes are available:

ENT, or by activating SELADR RX and keying the mic.

USB, LSB, AM (AME), and CW (MCW). To change

from one mode to another, press MODE

+ desed

(11) Receiver Selective Address. A

4-letter code

mode key + ENT.

programmed by pressing KEY

+ SEL RX + 4-letter

code + ENT. Receive selective address mode is ac-

(7) Receive Frequency.

2.0

29.9999 MHz,

tivated by using key sequence: KEY+ SEL RX + ON +

programmable in 100 Hz steps. To change frequen-

ENT.

cies press KEY + FRQ RX+ desired frequency + ENT.

(12) Output Power Level. Three output power

(8) Transmit Frequency.

2.0

29.9999 MHz,

levels are selectable from the keyboard; LO, MED, or

programmable in 100 Hz steps. To change frequen-

HI. The key sequence used in KEY+ LO, MED, or HI

cies press KEY + FRQ TX + desired frequency + ENT.

+ ENT.

(9) Squelch Level. Single step, detent-type con-

trol; squelch level is annunciated on the display and

varies from MIN, 1,

14, MAX. The squelch

level is not a stored parameter.

Figure

3-29.3 HF Volume Control

Change

3-55

TM 55-1520-210-10

(13) Modulation Source. Audio sources available

(18) CW Keying. To utilize the CW keying func-

are CLR-VC (clear voice), DATA, or encrypted audio

tion, first place the radio in CW mode. This is ac-

when used with voice security equipment. CIPHER is

complished by pressing the following key sequence:

displayed when the KY

75 is in the secure voice

MODE + CW + ENT. Now either the KEY key on the

mode. DATA and CLR-VC modes are selectable from

control panel, or any external key switch (a mic key)

control panel, when KY

75 is in non-secure mode,

may be used to transmit CW.

using key sequence: KEY + (SV-DATA or CLR-VC) +

ENT. The modulation source is not a stored

d. Detailed operation.

parameter.

(1) Channel Selection. Any one of

3 procedures

(14) Tune. By using appropriate key sequence,

may be used to select a channel.

either currently displayed channel or all 20 channels

may be turned to the antenna. The tuning information

(a) Using Function Control Knob.

is stored for future use with no tuning necessary. Cur-

rent channel may be tuned by pressing KEY + TUNE

+ ENT. All 20 channels may be tuned by pressing KEY

+ TUNE

+ SCAN

+ ENT.

(15) TEST. Built-in-Test (BITE) feature allows

operator to test both receiving and transmitting

capabilities at several frequencies. Any failure to meet

predetermined performance levels results in a failure

message being displayed. This identifies the faulty

unit and provides a maintenance code. The test is in-

itiated by pressing KEY + TEST + ENT.

(16) STORE. ENT key, used to terminate mode

changes, does not automatically store channel infor-

mation; therefore, a store sequence is provided. The

key sequence is: KEY + STO + ENT.

Figure

3-29.4 Channel Selection

(17) SCAN. Displayed channels may be placed

on scan list by pressing SCAN + ON + ENT. It can be

removed from scan list by pressing SCAN + OFF +

1. Set Function Select Knob to CHAN; rotate

ENT. To automatically scan those channels which

Function Control Knob to increment channel number,

have been placed on scan list, press the SCAN key,

or CCW to decrement channel number. If channels

the ENT key.

are changed quickly, (approximately

2 channels per

second or faster), only word CHANNEL, and an in-

(18) CW Keying. To utilize the CW keying func-

verse video channel number will be displayed on

tion, first place the radio in CW mode. This is ac-

screen until desired channel is reached.

complished by pressing the following key sequence:

MODE + CW + ENT. Now either the KEY key on the

control panel, or any external key switch (a mic key)

may be used to transmit CW.

3-56

Change

TM 55-1520-210-10

(b) Channel Slewing.

1. Begin by pressing CH, but rather than using

arrow keys, use the numbered keys to directly enter

desired channel number. After first digit is pressed,

display will be blanked except for the word CHANNEL,

and inverse video channel number. Press ENT to dis-

play the information associated with the newly

selected channel.

NOTE

In procedures (b) and (c), if CLR is pressed

before ENT, the information displayed will

be that which was displayed prior to initia-

tion of channel charge.

NOTE

Procedures (b) and (c) provide a con-

Figure

3-29.5. Channel Slewing

venient method of selecting channels,

should the function control knob be

damaged or otherwise become inoperable.

1. Begin by pressing CH key, and note that up

and down arrows appear in the lower right corner,

(2) Frequency Select.

(field 14). The up-arrow key increments the channel

number by one for each keystroke. The down-arrow

(a) Frequency Select (RX or TX).

key decrements the channel number by one for each

keystroke. When the first keystroke using an arrow is

made, display will be blanked except for arrows, in-

verse video channel number, and the work CHANNEL.

Once desired channel has been selected, press ENT,

and desired channel information will be displayed

(See the following Notes).

Figure

3-29.7. Frequency Select

Figure

3-29.6. Numbered Keys

Change 7

3-57

TM 55-1520-210-10

1. To initially program, or change, the receive fre-

quency for displayed channel, begin by pressing first

KEY and FRQ RX keys. Next, enter desired operating

frequency with the decimal point; for example,

12345.0. When new frequency has been correctly

entered, press ENT key, and new receive frequency

becomes operational.

2. Several changes occur on the display during

frequency change and these are as follows. A “K'' is

annunciated in lower right corner when KEY is

pressed (see Notes). The “K” is replaced by arrows

when FRQ RX is pressed, and receive frequency

digits field goes to inverse video mode. When the first

new frequency digit is entered, the previous receive

frequency is cleared. After the complete new frequen-

cy has been entered and ENT key is pressed, the dis-

Figure 3-29.8. Frequency Slewing (RX only)

play returns to normal.

3. When entering the frequency, a minimum of

1. Frequency slewing is in 100 Hz increments and

digits must be entered before the decimal point is

is accomplished using the up or down arrow keys.

entered. Otherwise an entry error will result and an

Each keystroke of an arrow key changes the frequen-

ENTRY ERROR message will be annunciated in the

cy by 100 Hz in the direction indicated by the arrow.

fault field. The operator must then press the CLR key

To use the frequency slewing feature, first KEY, then

and reenter an allowed frequency.

FRQ RX is pressed. Then either the up or down ar-

rows, and finally ENT when the desired frequency has

been reached. After FRQ RX is pressed, arrows will

4. The transmit frequency is changed in the same

be annunciated in the lower right corner, (field #14).

manner, but with the FRQ RX key replaced by FRQ

This cues the operator that slewing mode is available,

TX. The transmit frequency field (#5) will go to inverse

and the frequency digits field will be in inverse video.

video.

When ENT is pressed the display will return to normal.

(b) Frequency Slewing (RX only).

2. Slewing of the transmit frequency is not al-

lowed. Any attempt to do so will result in an error mes-

sage being annunciated in the fault field.

3-58

Change

TM 55-1520-210-10

(3) Power Level Select.

(4) Modulation Source Selection.

Figure

3-29.9. Power Level Select

Figure

3-29.10 Modulation Mode Source

(a) If high power lock is in effect, and HI is

selected, MED will be displayed.

(a) The key sequence shown above can select

the 600 ohm data input to the radio using the SV-

(b) Display field 9 goes to inverse video when X is

DATA key. Or it can select 150 ohm compressed audio

pressed and until ENT is pressed. “K” is cleared once

input, using the CLR-VC key. Display field

#10 ap-

“ENT’ is pressed.

pears in inverse video when CLR-VC and SV-DATA is

pressed. It returns to normal when ENT is pressed.

NOTE

(b) If voice security equipment indicates that its

There is a switch on the front of the AM-

output is encrypted, CIPHER will be annunciated on

7201/U which can inhibit the high output

the display. Otherwise, pressing CLR-VC displays

power mode.

CLR-VC, and pressing SV-DATA displays DATA.

Change

3-59

TM 55-1520-210-10

(5) Modulation Mode.

(a) If new channel data is entered and not sub-

sequently saved, “DATA NOT SAVED” will be annun-

ciated in the fault field. The word CHANNEL will

appear in inverse video. Fault messages would have

priority over the message. The key sequence above

may be used to save new channel information. The

“K'' will be cleared from field 14 once ENT is pressed.

(7) Selective Address

(a) Selective Receive Address.

Figure

3-29.11. Modulation Mode

(a) Field

3 appears in inverse video after X is

pressed and until ENT is pressed. “M'' appears in field

14 to indicate mode is being changed. “M” is cleared

once ENT is pressed.

(6) Store.

Figure

3-29.13. Selective Receive Address

1. Selective receive address is entered by press-

ing KEY, SEL RX, then the 4 different letters of the ad-

dress, and finally ENT.

2. When SEL RX is pressed, the receive address

field (#7) goes to inverse video. After the address has

been entered and ENT has been pressed, the display

returns to normal.

Figure

3-29.12. Store

3-60

Change

TM 55-1520-210-10

(b) Selective Transmit Address.

(8) SELADR ON/OFF.

Figure

3-29.14. Selective Transmit Address

1. Selective transmit address is entered by press-

ing KEY, the SEL TX, then 4-letter address, and finally

Figure

3-29.15. Seladr On/Off

ENT.

2. When SEL TX is pressed, the transmit address

(a) Seladr RX. To enable Seladr RX, use the key

field (#8) goes to inverse video. After the address has

sequence KEY + SEL RX + ON + ENT. With Seladr

been entered and ENT has been pressed, the display

enabled, receiver is fully squelched until correct

returns to normal.

Seladr tones are received, and Seladr squelch over-

rides squelch control. To receive Seladr tones, radio

NOTE

must be tuned to frequency on which Seladr tones,

radio must be turned to frequency on which Seladr

Four different letters must be used in the

tones are to be transmitted, or be scanning for that

code, and the arrangement of letters is ir-

frequency. Reception of a matching,

4 tone Seladr

relevant. The code ABCD is identical to the

code causes the following events to occur. Seladr RX

code BADC, and the letters will be dis-

will be deactivated. An audio tone will alert the

played in alphabetical order.

operator that he is being called. If the unit was pre-

viously scanning, scanning will cease. Squelch will

automatically be set to minimum.

NOTE

The operator can take the radio out of the

Seladr RX mode either by using the key se-

quence shown above, or by keying the mic.

Change 7

3-61

55-1520-210-10

(b) Seldar TX. Seladr TX may be activated with

1. Upon initiation of Built-In-Test (BITE) sequence

either the key sequence shown above, or, when

using keystrokes shown, CRT will first display a

Seladr RX is active, with the mic key. When the key-

checkerboard pattern for a few seconds. Then, an in-

board is used, ON is annunciated in the Seladr TX

verse checkerboard pattern to test the individual char-

field. XMIT appears in display field 13, and the 4-letter

acter spaces on the CRT. TEST will be displayed in

code is automatically transmitted for a predetermined

field 13 with the rest of CRT blank for remainder of

length of time. When mic keying is used, code will be

test.

transmitted for predetermined time period. Or it can be

as long as mic is keyed, which ever is longer. Seladr

2. If BITE must be haulted prior to completion,

TX is deactivated by any keystroke, however, it is

any keystroke will abort the test. However, for consis-

recommended that the CLR key be used.

tency, it is recommended that CLR be used as the ter-

minating keystroke.

(9) Test Mode Display.

3. Once BITE is completed and failed/passed dis-

(a) Test Mode.

play is annunciated, CLR must be used to return to

normal operating conditions.

(b) Failed Test Display.

Figure

3-29.17. Failed Test Display

Figure

3-29.16.Test Mode Display

1. First Row: Test Fail Message.

2. Third, fourth & fifth Rows: Unit(s) which failed

and failure code(s) for maintenance.

3. Seventh & eighth Rows: Test exit instruction.

3-62

Change

TM 55-1520-210-10

(b) All Channels.

Figure

3-29.18. Passed Test Display

Figure

3-29.20. Tune Mode-All Channels

(10) Tune Mode.

1. This sequence will tune all channels which

have been programmed with frequency information.

(a) Single Channel.

Any keystroke will be capable of ending either of the

tune operations. It is recommended that CLR be used.

The “K'' cleared once ENT is pressed. TUNE in-

dicator appears in field

13 when the TUNE key is

pressed and until tuning is complete.

2. If the mic is keyed, and a channel needs

tuning, “NOT TUNED” will be displayed in the fault

field.

(11) Scan Mode.

(a) Programming Scan.

Figure

3-29.19. Tune Mode-Single Channel

1. This sequence will tune only the channel cur-

rently displayed. Tune indicator appears in field

when TUNE is pressed and until tuning is complete.

The “K''s cleared once ENT is pressed.

Figure

3-29.21. Scan Mode

Change 7

3-63

TM 55-1520-210-10

1. To place a channel on, or remove a channel

1. To scan channels which have been stored onto

from scan list, begin by pressing SCAN key. At this

scan list, press SCAN key and ENT key. When ENT is

point SCAN will be annunciated in field 13. Arrows will

pressed, the display, except for the channel number,

be annunciated in field 14. The up-arrow key sets the

the word CHANNEL, and SCAN in field

13, will be

scan flag for the displayed channel. The down-arrow

blanked. The channel number will change as scanning

key clears the scan flag for the displayed channel.

takes place.

2. Once the flag has been set or cleared, press

2. To terminate scanning, it is recommended that

ENT The arrows and SCAN will be cleared from the

the CLR key be used, although any keystroke is

display. If the scan flag was set, and “S will be annun-

capable of ending scanning. Normal radio operation

ciated in the lower left comer of the display. This indi-

will be restored for that channel which was being

cates that the dislayed channel is on the scan list.

scanned when scanning was terminated.

NOTE

e. Example Programming One or More Channels.

The following procedure may be used to initially pro-

The scan flag must be stored after being

gram a single channel with all the necessary operating

entered in order for the channel to be

parameters. To program additional channels, simply

placed on the scan list.

change the active channel number and duplicate the

procedure. Insert the operating information for the

channel.

(b) Executing Scan.

(1) Power

on. Turn the Function Select Knob

clockwise one

position to BRT. When the radio has

warmed up, a “system ready” message will be dis-

played for a few seconds. The channel

0 information

previously stored will be displayed.

(2) Set CRT Brightness. Adjust the Function Con-

trol Knob until the display has the desired brightness.

(3) Set Audio Volume. Set the function select

knob to the VOL position. Set the CDU VOL knob to

the max. position. Adjust the HF volume control to the

desired volume.

Figure

3-29.22. Executing Scan

3-64

Change 7

TM 55-1520-210-10

(4) Set Squelch. With no reception of RF, use the

NOTE

Squelch Knob to adjust the audio to the point where

backg0round noise is muted.

The store function stores only the currently

displayed channel information. Therefore,

(5) Channel Select. Turn Function Select Knob to

the store function must be implemented for

CHAN and adjust the Function Control Knob to the

each individual channel before selecting a

desired channel.

new channel.

(6) Operating Parameters. Use procedures in

(8) Tune. After all the desired channels have been

Detailed Operation to select modulation mode, receive

programmed, initiate the tune sequence for all chan-

and transmit frequencies, receive and transmit selec-

nels.

tive address, power level and modulation source.

Place the channel on the scan list if desired. Place in

(9) Test. If a test of the AN/ARC-199 system is

retransmission mode if desired.

desired, initiate the test sequence. The system may

be performed at any time after the system is powered

(7) Store. The information that has just been

on. The radio is now ready to receive or transmit on

programmed is now operational but is not yet per-

frequencies being displayed.

manently stored. If desired to permanently Store this

information for the displayed channel, use the store

procedure.

Figure 3-29.23. HF Volume Control

Change 7

3-65

TM 55-1520-210-10

Controls and Functions of LF/ADF Control Panel C-7932/ARN-89

CONTROL

FUNCTION

Mode selector switch

Audible tone for tuning to CW station, SS

OFF

Turns power off.

COMP

Provides operation as an ADF.

ATN

Provides for operation as an AM

receiver using sense antenna

LOOP

Provides for receiver operation as a

manual direction finder using loop only.

LOOP L-R control

Provides manual left and right control

of loop when operating mode selector in

LOOP position. It is spring loaded to

return to center.

AUDIO

Adjusts volume.

100 Kilohertz

Tunes receiver in 100-KHz steps as

coarse-tune

indicated by first two digits of KILO-

control knob

CYCLES indicator.

CW (COMP mode)

Enables tone oscillator to provide

audible tone for tuning to CW station,

when mode function switch is at COMP,.

CW (ANT or LOOP

Enables beat frequency oscillator to

mode)

permit tuning to CW station, when mode

function switch is at ANT or LOOP.

VOICE

Permits low frequency receiver to

operate as a receiver with mode switch

in any position.

TEST (COMP mode)

Provides slewing of loop through 180°

to check operation of receiver in COMP

mode. (Switch position is inoperative

in LOOP and ANT modes.)

TUNE Meter

Indicates relative signal strength

while tuning receiver to a specific

radio signal.

KILOCYCLES

Indicates operating frequency to which

receiver is tuned.

Change 7

3-67

TM 55-1520-210-10

Operation

(b) HSVVSI MODE SEL BRG 2 switch - ADF.

(1) Starting Procedure.

1 bearing

pointer displays the magnetic bearing to the ground

(a) ICS NAV receiver selector - ON.

station from the helicopter. It is read against the

compass card when ADF is selected on the MODE SEL

(b) Mode selector - COMP, ANT, or LOOP.

BRG I switch.

(d) ICS NAV switch - ON

(d) CW, VOICE, TEST switch - CW or VOICE as al

(e) To test the ADF, when required.

propiate.

(e) ICS NAV switch - ON.

CW, VOICE, TEST switch - Test to see that No

(f)

Fine tune control - adjust for maximum upward ir

1 bearing pointer changes about.

diction on TUNE meter.

2. CW, VOICE, TEST switch - release.

(g) AUDIO control - adjust as desired.

(4) LOOP Mode Operation Manual direction finding

(2) ANT Mode Operation.

uses the LOOP mode.

(a) Mode selector - ANT.

(a) Mode selector switch - LOOP

(b) ICS NAV switch - ON.

obtain an audio null and a tune In null. Watch HSI No. 1

(3) COMP Mode Operation.

bearing pointer for a display of magnetic bearing to or

from ground station against the compass card. In this

(a) Mode selector - COMP.

mode of operation two null positions 1800 apart as

possible

Stopping Procedure. Mode selector - OFF.

3-68 Change16

ARMY MODEL UH-1H/V HELICOPTERS. OPERATOR’S MANUAL (1988) - page 3