I TM 11-5820-I 048-110DEPARTMENT OF THE ARMY

OPERATOR’S MANUAL

’ PMCS

l

OPERATION ’

RADIO SET AN/PRC-127(NSN 5820-01-266-5964)

1 JANUARY 1991’

Distribution authorized to the Department of Defense andDOD contractors only for official use or for administrativeor operational purposes. This determination was made on1 January 1891. Other requests for this document will bereferred to Commander, US Army Communications-ElectronicsCommand and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, FortMonmouth, NJ 0770345000.

DESTRUCTION NOTICE - Destroy by any method that willprevent disclosure of contents or reconstruction of thedocument .

Batteries can explode if exposed to extreme heat. Donot store battery packs with other hazardous materials.Store in a cool [less than 130°F (54°C)], dry, well-ventilated area to prevent injury to personnel ordamage to equipment.

Batteries contain corrosive material that can causeinjury to personnel. Do not crush, puncture, mutilate,or disassemble battery packs.

Do not dispose of alkaline batteries in fire. Do notrecharge batteries, put in backwards, or mix with usedor other battery types. Alkaline batteries may explode,leak, and cause injury to personnel or damage toequipment.

a / blank)

* T M 1 l - 5 8 2 0 - 1 0 4 8 - 1 0

TECHNICAL MANUAL Headquarters,

Department of the Army

NO. 11-5820-1048-10 Washington, DC, 1 January 1991

Operator’s ManualRADIO SET AN/PRC-127(NSN 5820-01-266-5964)

REPORTING ERRORS ANDRECOMMENDING IMPROVEMENTS

You can help improve this manual. If you findany mistakes or if you know of a way to improvethe procedures, please let us know. Mail yourletter or DA Form 2028 (Recommended Changesto Publications and Blank Forms) direct toC o m m a n d e r , U S A r m y Communications-Electronics Command and Fort Monmouth,ATTN: AMSEL-LC-LM-LT, Fort Monmouth, NewJersey 077034000. A reply will be furnished toyou .

*This manual supersedes TM 1 l -5820-1048-10,

dated 1 February 1990, which shall be destroyed in

accordance with applicable security regulations.

Page

HOW TO USE THIS MANUAL . . . . . . . . . vi

CHAPTER 1 INTRODUCTION

Section 1. General Information . . . . . . . . . . . . . . . . . . . 1 -1

1 - 1 S c o p e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1l-2 Maintenance Forms,

Records, and Reports . . . . . . . . . . . . 1 - 2l-3 Reporting Equipment

Improvement Recom-mendations (El Rs) . . . . . . . . . . . . . . . . . 1 - 2

1-4 Warranty Information . . . . . . . . . . . . . . . . . . 1 - 3l-5 Nomenclature Cross-

Reference List . , . . . . . . . . . . . . . . . . . . . . . . 1-3

Section II.,

Equipment Description . . . . . . l . . . . 1-4

1-6 Purpose and Use of RadioSet AN/PRC-127 . . . . . . . . . . . . . . . . . . . . 1 - 4

l-7 Location and Descriptionof Major Components . . . . . . . . . . . . 1 - 5

1-8 R/T Unit and BatteryPack Data . . . . . . . . . . . . . . . . . . . . . . . . . l . . . . 1 7

l - 9 Battery Charger Data . . . . . . . . . . . . . . . . . 1-8

Page

Section I

1-1

II .

0

l-111-121-131-14l-15l-16

CHAPTER 2 OPERATING INSTRUCTIONS

Section 1.

2-1 General ...................................... 2 12-2 Controls and Indicators .............. 2-1

Section II.

2-3 General .....................................2-8

2-4 PMCS Procedures l . . . . . . . . . . . . ...*2 - 9

Technical Principlesof Operation . . . . . . . . . . . ..a............. l - 9

Receiver/TransmitterRT/ 1594/PRC-127 ................. l - 9

Antenna AS-3960/PRC-127.. ..... l-1 0Battery Pack ............................... l - 1 0Speaker/Microphone.. ................ l-1 1Speaker/Microphone Cover.. ..... l-11R/T Holster ................................. l-11Battery Charger .......................... 1-12

Description and Use ofOperator’s Controlsand Indicators . . . . . . . . . . . . . . . . . . . . . . 2-1

Preventive MaintenanceChecks and Services . . . . . . . . . . . . . 2-8

Page

Section III. Operation Under UsualConditions I . . . . . . . . . . . 2-13

2 5-

2-6

2-7

2-8

2-9

2-10

2-112-12

Assembly and Preparationfor Use . . . . . . . . . . . . . . . . . . . . . . . ..*......... 2-13

Battery Pack Installation/Removal . . . . ..*.........*................ 2-14

Alkaline BatteriesInstallat ion/Removal . . . . . . . . . . . . . . 2-17

Speaker/MicrophoneInstallation/Removal . . . . . . . . . . . . . . 2-2 1

Antenna Installation/Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22

Door Cover Installation/Removal . . . . . . . . . ..a..............*...... 2-23

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . 2-25Battery Charger Operation . . . . . . . . . 2-26

Section IV. Operation Under UnusualConditions . . . . ..*....................... 2-28

IV

2-13 Operation at LowTemperature . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28

2-14 Operation at HighTemperatures . . . . . . . . . . . . . . . . . . . . . . . . 2-28

2-15 Operation in TropicalClimates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

2-16 Operation During Jamming . . . . . . . . 2-29

Page

CHAPTER 3 MAINTENANCE INSTRUCTIONS

Section I. Lubrication Instructions . . . . . . . . . . . . . . 3-1

II. TroubleshootingProcedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Ill. MaintenanceProcedures l . . . . . . . . . . . . * . . . . . . . . * . . . . * 3-1

APPENDIX A. REFERENCES. . . . . . . ..*................. A-lAPPENDIX B. COMPONENTS OF END

ITEM AND BASIC ISSUEITEMS LIST . . ..*.......*.............. B-1

APPENDIX C. ADDITIONAL AUTHORI-ZATION LIST (Not applicable)

APPENDIX D. EXPENDABLE/DURABLESUPPLIES AND MATERIALSLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-l

HOW TO USE THIS MANUAL

This is a quick reference manual that has beenwritten just for you. Become familiar with itscontents so that you will be able to find what youneed quickly.

This manual will show you how to:

o OPERATEo MAINTAIN

YOUR RADIO SET AN/PRC-127

It is small enough to fit in your pocket so you canalways have it ready for quick reference. Afteryou have had some time to use it, take a momentto let us know what you think about it.

CHAPTER 1INTRODUCTION

Section I.GENERAL INFORMATION

RADIO SET

AN/PRC-127

l-l : SCOPE

This manual tells the user how tooperate Radio Set AN/PRC-127.

1-2 MAINTENANCE FORMS, RECORDS, ANDR E P O R T S

a. Reports of Maintenance and UnsatisfactoryEquipment. Department of the Army forms andprocedures used for equipment maintenance will bethose prescribed by DA Pam 738-750, as contained inMaintenance Management Update.

b. Report of Item Packaging Discrepancies. Fillout and forward SF 364 [Report of Discrepancy (ROD)]a s p r e s c r i b e d i n A R 735-11-2/DLAR 414O.55/SECNAVINST 4355.18/AFR 400-54/MC04430.3J.

c . Transportation Discrepancy Report (TDR) (SF367). Fill out and forward Transportation DiscrepancyR e p o r t ( T D R ) ( S F 3 6 1 ) a s p r e s c r i b e d i n A R55-38/NAVSUPINST 4610.33C/AFR 75-1 8/MCOP4610.19D/DLAR 4500.15.

1-3 REPORTING EQUIPMENT IMPROVEMENTRECOMMENDATIONS (EIRs)

If your Radio Set AN/PRC-127 needs improvement,let us know. Send us an EIR. You, the user, are theonly one who can tell us what you don’t like about yourequipment. Let us know why you don’t like the designor performance. Put it on an SF 368 (Product QualityDeficiency Report). Mail it to: Commander, US Army

Communications-Electronics Command and FortMonmouth, ATTN: AMSEL-ED-WI, Fort Monmouth,

New Jersey, 07703-5000. We’ll send you a reply.

The Receiver/Transmitter R T - 1594/PRC-127 iswarranted by the King Radio Corporation for 24months from acceptance as evidenced by the signingof DD Form 250 by an authorized Governmentrepresentative of acceptance for the equipment or 12months after handoff to a field unit, whichever occursfirst. Report all defects in material or workmanship toyour supervisor, who will take appropriate actionthrough your unit maintenance shop.

1-5 NOMENCLATURE CROSS-REFERENCELIST

Common names will be used when following majorcomponents are mentioned in this manual.

Common Name Official Nomenclature

radio set Radio Set AN/PRC-127

R/T Receiver/TransmitterRT-1594/PRC-127

antenna Antenna AS-3960/PRC-127

13-

Section II.EQUIPMENT DESCRIPTION

1-6 PURPOSE AND USE OF RADIO SETAN/PRC-127

T h e r a d i o s e t i s a h a n d - h e l d , 14-channelreceiver/transmitter that provides two-way radiocommunications in the 136 to 160 MHz frequencyrange. DC power is provided by a detachable batterypack. The radio set consists of an R/T, an antenna,two rechargeable nickel-cadmium (Ni-Cd) batterypacks and one nonrechargeable alkaline battery pack,a speaker/microphone, a speaker/microphone cover,door microphone, a speaker/microphone cover, doorcover, an R/T holster, and a battery charger. Thesemajor components are described in paragraph 1-7

1-4

1 - 7 LOCATION AND DESCRIPTION OFMAJOR COMPONENTS

\The components shown make upRadio Set AN/PRC-127.

ANTENNA

AS-3960/PRC-127

I RECEIVER/TRANSMITTERRT-1594/PRC-127-

DOOR COVER

J (PROTECTS DISPLAYAND KEYPAD)

1 5m

iii

a

t--cc?

l-8. R/T UNIT AND BATTERY PACK DATA

Frequency ................................. 136.000 to 160.00 MHzPreset channels .......................................................... 14Preset channel spacing ........................... programmableModulation ............................ frequency modulation (fm)Range ......................................................... 3000 metersBattery operating time

Alkaline battery pack ...................................... 6 hoursNi-Cd battery pack ......................................... 6 hours

Power output ............................................................ 2 w

Physical

Weight (including battery andantenna, no handset) . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 lb (0.68 kg)

Size R/T unit including battery . . . . . . . . . . . . . . . . . 7.80 in.(198.1mm) x 2.50 in. (63.5 mm) x

1.52 in. (38.6 mm)

Environmental

Operating temperature I

range . . . . . . . . . . . . . . . . . . . . . . . . . . ..*.................. -11°F to +111°F(-24°C to +44°C)

Watertightness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .not immersible

17-

Input voltage . . . . . . . . . . . . . . . . . . 115 V ac/230 V ac (selectable)Input frequency . . . . . . . . . . . . . . . . . . . ............................ 50/60 HzInput power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15WCharge current

Slow Charge rateMinimum . ..............................................................60 mAMaximum. . . . . . . . . . . . . .................................... 140 mA

Fast charge rateminimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l . . . . . . . 700 mAmaximum. . . . ............................................... 1100 mA

Physical

Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.25 lb (1.47 kg)Size . . . . . . . . . . . . . . . . 6.75 in. (171.5 mm) x 3.25 in. (82.6 mm)

x 3.37 in. (85.6 mm)

Environmental

Operating temperaturerange . . . . . . . . . . . . . . . . . . . . . +32°F to +140°F (O°C to +60°C)

Humidity . . . . . . . . . . . . . . . . . . . . . 0 to 90% at ambient temperatureof +95°F (+35°F)

Section III.TECHNICAL PRINCIPLES OF OPERATION

l-l 0. RECEIVER/TRANSMITTER RT-1594/PRC-127

The R/T contains the circuitry to receive and transmitvoice signals over a distance of 3000 meters using anyone of up to 14 preset channels. Each of the 14channels is preset to a specific frequency. A volumecontrol is provided to adjust the receive signal to acomfortable listening level. A squelch control isprovided to inhibit noise and unwanted receiversignals. A push-to-talk control is provided to key thetransmitter. The control is pressed to talk and releasedto listen. A speaker/microphone is built into the R/T foruse without an external speaker/microphone.

NOTE

The R/T preset operational channels

are programmed as a maintenance

function by unit maintenance support

personnel.

l-1 1 l ANTENNA AS-3960/PRC-127

The antenna is used to interface the received andtransmitted signals with the R/T. This omnidirectional,flexible antenna attaches to the R/T via a connectorand can be detached for storage or shipment.

l-12. BATTERY PACK

The battery pack supplies dc operating power to theR/T. The battery pack attaches to the bottom of theR/T and is held in place by a spring clip and bracket onthe R/T and posts on the battery pack. The batterypack can be removed easily for replacement. Twotypes of battery packs are provided. One type is arechargeable Ni-Cd battery pack. The second typecontains nonrechargeable alkaline batteries. The Ni-Cd battery pack may be recharged while eitherattached or detached to/from the R/T.

1-10

The speaker/microphone clips securely to collar orlapel to provide communication without removing theR/T from the operator’s belt. A built-in feature on thespeaker/microphone allows the operator to speakdirectly into the microphone attached to the lapel whilekeying the transmitter using the push-to-talk control onthe R/T attached to the belt. The speaker/microphoneis attached to the R/T via connectors.

The speaker/microphone cover is a nylon cover usedto protect the speaker/microphone from theenvironment.

1-l 5. R/T HOLSTER

The R/T holster is a nylon cover used to carry andprotect the R/T, with battery pack attached, from theenvironment. An opening in the holster flap allows theantenna to be attached while the R/T is in the holster.Hardware is provided to attach the holster to theoperator’s belt.

l-11

1-l 6. BATTERY CHARGER

The battery charger is used to charge the Ni-Cd batterypacks. The battery charger provided is a desk-typecharger that charges to 90% of full charge in 1 hour.Once the charging function is complete, the unit willautomatically switch to a trickle rate to maintain thecharge without overheating the battery pack. The rateof charge in progress is indicated by lamps on thebattery charger. A green lamp indicates the minimumrate of charge or trickle rate. A red lamp indicates themaximum rate of charge is in progress up to 90% fullcharge. The battery charger operates on either 115 Vac or 230 V ac source voltage. A switch on theunderside of the battery charger must be set to theproper voltage before use. An adapter, suited togeographical location, is required for 230 V acoperation.

1-12

CHAPTER 2OPERATING INSTRUCTIONS

Section 1.DESCRIPTION AND USE OF

OPERATOR’S CONTROLS AND INDICATORS

2-l l GENERAL

You should not attempt to operate the radio set untilyou fully understand the operation and function of thecontrols and indicators. The normal operatingprocedures are given in Section III of this Chapter.

2-2. CONTROLS AND- INDICATORS

The following keyed illustrations and text serve toprovide the operator with basic understanding of theradio set controls and indicators.

21-

NOTE: DOOR COVER REMOVED FOR ACCESS TO

DISPLAY AND KEYPAD

2-2-I

KeyControl orIndicator

CG-SQcontrol

OFF-VOLcontrol

Channelselectcontrol

Speaker/microphone

Function

Provides CODE G U A R Doperation not available on theAN/PRC-127 and sets squelchthreshold level (cw) or off (fullccw) .

Turns radio set on (cw) or off(full ccw). Adjusts level ofsound heard from radio set orspeaker/microphone.

Selects one of 14 presetoperating channels.

Functions as built-in speaker(receive) and microphone(transmit) when externalspeaker/microphone is notconnected.

2 3.

NOTE: DOOR COVER REMOVED FOR ACCESS TO

DISPLAY AND KEYPAD

2-4

2-2. CONTROLS AND INDICATORS - CONT

KeyControl orIndicator

Display

Keypad

Push-to-talkcontrol

Speaker/microphoneaudioconnectors

Antennaconnector

Function

Five-digit liquid crystal display(LCD) used to indicateselected preset channel andmaintenance. For unitmaintenance only.

Sixteen-pushbutton keypad forunit maintenance level useonly .

Enables radio set to trans-mit when pressed.

Standard connectors for usewith external speaker/microphone

Connects antenna to radioset.

2 5I)

Key

1 0

11

1 2

Control orIndicator

LOWindicator

HIGHindicator

115/23OVswitch

Function

Green lamp lights to indicateslow charge (minimum rate).

Red lamp lights to indi-cate fast charge up to 90%charge (maximum rate).

Selects 115 or 230 V acoperation. For 230 V acoperation, depending ongeographical location, anadapter must be used.

2-7I

Section II.PREVENTIVE MAINTENANCE

CHECKS AND SERVICES

2-3. GENERAL

To ensure the radio set is always ready for operation, itmust be inspected as required so that defects may bediscovered and corrected before they cause seriousdamage or failure.

a. Before You Operate. Always keep in mind theCAUTIONS and WARNINGS. Perform the before (B)PMCS.

b. While You Operafe. Always keep in mind theCAUTIONS and WARNINGS. Perform the during (D)PMCS.

2-4. PMCS PROCEDURES

The Preventive Maintenance Checks and Services are.required to keep your radio set in operating condition.If the radio set does not perform as required, reportmalfunctions or failures on DA Form 2404 or refer toDA Pam 738-750. An explanation of columns found inthe PMCS chart is as follows:

2 8.

o Interval Column - This column tells you when to do acertain check or service.

o Items to be Inspected Column - This column tellsyou what item to check or service.

o Procedure Column - This column tells you how toperform a service or check.

o Equipment Not Ready/Available If Column - Thiscolumn tells you when and why the equipmentcannot be used.

2-9-

OPERATOR PREVENTIVEMAINTENANCE CHECKS AND SERVICES (PMCS)

B-Before D-During

INTER-VAL

ITEMN O. B

0

0

D

ITEMTO BE

INSPECTED

Antenna

Operatingcontrols

PROCEDURES FOR READINESSCHECK FOR AND REPORTINGHAVE REPAIRED EQUIPMENT

OR ADJUSTED NOT READY/AS NECESSARY AVAILABLE IF:

Not broken, Broken, loose, orfirmly secured. missing.

Not missing orloose, operatesmoothly withoutbinding.

Loose, missing, orbinding.

OPERATOR PREVENTIVEMAINTENANCE CHECKS AND SERVICES (PMCS) - CONT

B-Before D-During

INTER-VAL

ITEMN O.

3

4

B

0

D

0

ITEMTO BE

INSPECTED

Speaker/microphone

Basicoperation

PROCEDURES FOR READINESSCHECK FOR AND REPORTINGHAVE REPAIRED EQUIPMENT

OR ADJUSTED NOT READY/AS NECESSARY AVAILABLE IF:

Not broken,firmly secured.

Unit on, set toassigned channel,communicatewith distantstation.

Broken, loose, ormissing.

Distant station can-not hear you or youcannot hear distantstation. ’

B-Before D-During

ITEMN O.

OPERATOR PREVENTIVEMAINTENANCE CHECKS AND SERVICES (PMCS) - CONT

INTER-VAL

TiITEM

TO BEB D INSPECTED

0 Batterypack

0 Batterycharger

PROCEDURESCHECK FOR ANDHAVE REPAIREDOR ADJUSTED

AS NECESSARY

Unit on, nottransmitting.

Unit on, notcharging.

FOR READINESSREPORTINGEQUIPMENTNOT READY/

AVAILABLE IF:

Will not receiveor transmit.

HIGH or LOWlamps not lighted.

Section Ill.OPERATION UNDER USUAL CONDITIONS

2-5. ASSEMBLY AND PREPARATION FORU S E

T h i s r a d i o s e t w a s c a r e f u l l y i n s p e c t e d b o t hmechanically and electrically before shipment. Itshould be physically free of mars or scratches. Uponreceipt, inspect the radio set as follows:

a.

b .

c.

During unpacking, inspect the radio set forphysical damage that may have occurred duringshipment. If the equipment has been damaged,report the damage on SF 364, Report ofDiscrepancies (ROD).

Check the radio and supplied accessoriesagainst the packing slip to ensure the shipmentis complete.

Assemble radio set as required in accordancewith paragraphs 2-6 thru 2-10.

2-13

2-6. BATTERY PACK INSTALLATION/REMOVAL

WARNING

Batteries can explode if exposed toextreme heat. Do not store battery packswith other hazardous materials. Store ina cool [less than 130°F (54°C)], dry, well-ventilated area to prevent injury topersonnel or damage to equipment.

Batteries contain corrosive material thatcan cause injury to personnel. Do notcrush, puncture, mutilate, or disassemblebattery packs.

CAUTION

To prevent damage to R/T, only use batterypacks (item 1 or 2, Appx D) authorized forthis equipment.

2-14

a. Installation

(1) Locate center hub on R/T base and place itin recess of battery pack.

(2) Position battery pack at 30 degrees, seatingtwo metal studs in their recesses.

(3) Apply upward pressure to battery pack whiletwisting battery pack clockwise to its originalposition.

(4) The metal tab on side of R/T will click,locking battery pack into position.

i

a

2-15

b. Removal

(1) Ensure OFF-VOL control is set to OFF.

(2) Push metal tab on side of R/T upward whiletwisting battery pack counterclockwiseapproximately 30 degrees.

(3) Remove battery pack from R/T

(4) Check contacts on bottom of battery packfor dirt or corrosion. Dirt may prevent agood electrical contact with the batterycharger.

NOTE

Rechargeable battery packs can be chargedseparately or while attached to the R/T.

2-16

2-7. ALKALINE BATTERIES INSTALLATION/REMOVAL

WARNING

Do not dispose of alkaline batteries in fire.Do not recharge batteries, put in backwards,or mix with used or other battery types.Alkaline batteries may explode, leak, andcause injury to personnel or damage toequipment.

a. Battery Pack Cover Removal

(1) While holding battery pack, press down ontwo metal studs to release battery tray.

(2) Remove battery pack cover.

2-17

b. Alkaline Batteries Installation

CAUTION

To prevent damage to equipment, alkalinebatteries must be installed in the samedirection for each side of the battery tray.

(1) Lay ribbon flat and install five alkalinebatteries in direction shown in battery tray.

(2) Turn battery tray over and repeat step (1)for five remaining batteries.

2-18

c. Alkaline Batteries Removal

(1) While holding battery tray flat, slowly pull onribbon and remove five batteries.

(2) Turn battery tray over and repeat step (1).

2-19

d . Battery Pack Cover lnstallation

NOTE

There is a long and a short shoulder on thebattery tray. The long shoulder aligns withthe long shoulder of the battery pack cover.

(1) Install battery pack cover over battery tray.

(2) Push down on battery pack cover until itlocks in place on battery tray.

LONG SHOULDER -a

LONG SHOULDER -

2-20

2-8. SPEAKER/MICROPHONE INSTALLATION/REMOVAL

a. Installation

(1) Disengage cover from R/T speaker/microphone audio connectors.

(2) Mate speaker/microphone cable connectorto R/T speaker/microphone audioconnector.

(3) Secure speaker/microphone cableconnector to R/T with connector screw.

b. Remova l

(1) Loosen cable connector screw.

(2) Separate speaker/microphone cableconnector from R/T.

(3) Secure cover on R/T speaker/microphoneaudio connectors.

2-21

a. Installation

(1) Mate antenna connector with antennaconnector on radio set.

(2) Rotate antenna connector clockwise untilsecure (hand tight).

b. Removal

(1) Grasp antenna where connectors mate.

(2) Rotate antenna connector counterclockwiseuntil connectors separate.

2-10. DOOR COVERINSTALLATION/REMOVAL

CAUTION

To prevent damage to door cover, avoidrough handling. When attempting to install,ensure edges of door cover are properlyaligned with mounting grooves. Do notforce door covers onto R/T.

a. Installation

(1)

(2)

(3)

(4)

Remove battery pack from R/T as describedin paragraph 2-6.

Locate mounting tab on door cover.

With mounting tab down, aline door coverwith mounting grooves on R/T and slidedoor cover upward until stopped bymounting tab against bottom edge of R/T.

Lift up gently on bottom edge of door coverand slide door cover upward until stoppedagainst top edge of display.

2-23

(5) Release door cover and gently press downand upward to seat mounting tab intodepression on R/T.

6. Removal

(1) Remove battery pack from R/T as describedin paragraph 2-6.

(2) On R/T, gently lift up on bottom edge ofdoor cover to clear mounting tab.

(3) While continuing to lift up on door cover,slide door cover downward to clearmounting grooves.

2-24

2-l 1. NORMAL OPERATION

a .

b .

c .

d .

e.

Turn power on by rotating OFF-VOL controlclockwise past OFF detent.

Select appropriate channel 1 thru 14 usingchannel select control.

Rotate CG-SQ control clockwise past CG detentuntil rushing noise is heard.

Adjust OFF-VOL control for comfortable level.

Rotate CG-SQ control counterclockwise untilrushing noise stops. This is called squelchthreshold setting.

NOTE

Warning beep will sound if transmitting on achannel that is not programmed with a validfrequency.

f . Press push-to-talk control and speak into built-inspeaker/microphone to transmit.

g . Release push-to-talk control to listen.

h. To turn off radio set, rotate OFF-VOL controlfully counterclockwise.

2-25

2-12. BATTERY CHARGER OPERATION

CAUTION

o To prevent damage to battery charger, donot attempt to charge an alkaline batterypack. Only a Ni-Cd battery pack can berecharged.

o To prevent damage to battery charger, donot connect battery charger to 230 V acwith 1 lW23OV switch set to 115V.

For 230 V ac operation, depending ongeographical location, an adapter must beused.

a. Set 115W23OV switch on bottom of batterycharger to applicable position.

b. Connect battery charger to electrical outlet forselected voltage.

2=26

c . Place R/T with attached battery pack or batterypack alone into battery charger cradle.

The battery charger is fully automatic andprovides the proper charge rate and chargerate indication.

d . Observe LOW and HIGH indicators on batterycharger. If battery pack charge is extremely low,HIGH (red) indicator on battery charger will lightto indicate maximum charge rate in progress.After battery pack reaches 90% charge, LOW(green) indicator on battery charger will light toindicate minimum rate of charge (trickle charge)in progress.

2-27

Section IV.OPERATION UNDER UNUSUAL CONDITIONS

2-13. OPERATION AT LOW TEMPERATURES

The radio set can operate to -11 OF (-24OC). However,you must keep the operating controls and connectorsfree of ice. The same holds true for the antenna as iceon the antenna will reduce or distort the signal. Thebattery should be kept as warm as possible.

2-14. OPERATION AT HlGli TEMPERATURES

This radio set can operate to +ll l°F (+44OC).However; in hot, dry climates, the connectors ahdoperating controls are subject to damage from dustand dirt. When not in use, keep the connectorscovered with the plug cover. Keep the operatingcontrols as dust-free and dirt-free as possible.Constant exposure to the sun could cause damage, sotry to keep the equipment out of the sun as much aspossible.

2-15. OPERATION IN TROPICAL CLIMATES

In warm, damp climates, the equipment is subject todamage from moisture and fungi. Wipe all moistureand fungi from the equipment with a dry, lint-free cloth.

2-l 6. OPERATION DURING JAMMING

A common jamming procedure is the transmission of astrong or annoying signal on your operating channel,making it difficult or impossible for you to maintaincommunications. Sometimes this signal may be from afriendly station. It is also possible that the unusualnoise or interference may be due to a bad radio set.To check it out, do the following:

a. Disconnect the antenna in accordance withparagraph 2-9.

Do not key transmitter with antennaconnector shorted out to prevent damage toequipment.

b. Short out the antenna connector with availablematerial.

2-29

c. If you still have noise or interferences, you havea bad radio set. If the noise or interferencegoes away, you are being jammed. Reportjamming as soon as possible to officer inc h a r g e . O n e o r m o r e o f t h e f o l l o w i n gantijamming procedures may allow you tocontinue operating the radio set.

(1)

(2)

(3)

(4)

Try to use a nearby obstruction as a screen.Position yourself so that the obstruction actsas a screen between the radio and thepossible source of interference.

Point your radio in the direction of thedistant station you are communicating with.Try several positions.

Change the setting of the VOL control. Thismay raise the level of the desired signalenough to be heard over the jammingsignal.

If none of the above works, get permissionto change to another channel.

2-30

CHAPTER 3MAINTENANCE INSTRUCTIONS

Section I.LUBRICATION INSTRUCTIONS

The radio set does not require any lubrication.

Section II.TROUBLESHOOTING PROCEDURES

Other than replacing a suspected defective batterypack (paragraph 2-6) or replacing alkaline batteries(paragraph 2-7), no operator troubleshooting isauthorized for the radio set. Any trouble detected byyou is to be reported to unit maintenance personnel.

Section Ill.MAINTENANCE PROCEDURES

Operator maintenance of the radio set and batterycharger is limited to keeping it as clean as possible atall times. Use clean, lint-free cloth (item 3, Appx D) todo this.

3-l/(3-2 blank)

APPENDIX AREFERENCES

A-l m SCOPE

This appendix lists all forms, technical manuals, andmiscellaneous publications that are referenced in thismanual or that contain information applicable to theoperation and maintenance of the radio set.

A-2. FORMS

Recommended Changes toEquipment Technical Manuals . . . . . . .

Equipment Inspection andMaintenance Worksheet . . . . . . . . . . .

Transportation DiscrepancyReport (TDR) . . . . . . . . . . . . . . . . . . . . . .

Report of Discrepancy (ROD) . . . . . . .

Product QualityDeficiency Report. . . . . . . . . . . . . . . . . .

DA Form 2028-2

DA Form 2404

Form SF 361

Form SF 364

Form SF 368

A-l

Procedure for Destruction of Elec-tronics Materiel to PreventEnemy Use (Electronics Command) . . . . . . ..TM 750-244-2

Unit, Direct and General

Support Maintenance Manual(Including Repair Parts andSpecial Tools List). . . . . . . . . . . . . . . . . . . TM 1 1-5820-l 048-24&P

A-4. MISCELLANEOUS

Consolidated Index of ArmyPublications and Blank Forms . . . . . . . . . . . . . . . . DA Pam 2530

The Army Maintenance Manage-ment System (TAMMS) . . . . . . . . . . . . . . . . . . . . . . . DA Pam 738-750

Warranty Program forRadio Set AN/PRC-1267Receiver/TransmitterRT-1594/PRC-127 . . . . . . . . . . . . . . . . . . . . . . TB 1 1-5820-l 048-X

A 2m

APPENDIX BCOMPONENTS OF END ITEM

AND BASIC ISSUE ITEMS LIST

Section I.INTRODUCTION

B-l l SCOPE

This appendix lists components of end item and basicissue items for the radio set to help you inventory itemsrequired for safe and efficient operation.

B-2. GENERAL

The Components of End Item and Basic issue ItemsLists are divided into the following sections:

a. Section Il. Components of End Item. This listingis for informational purposes only, and is not authorityto requisition replacements. These items are part ofthe end item, but are removed and separatelypackaged for transportation or shipment. As part of theend item, these items must be with the end itemwhenever it is issued or transferred between propertyaccounts. Illustrations are furnished to assist you inidentifying the items.

Bl.

b. Section 111. Basic Issue Items. These are theminimum essential items required to place the radio setin operation, to operate it, and to perform emergencyrepairs.

B-3. EXPLANATION OF COLUMNS

The following provides an explanation of columnsfound in the tabular listings:

a. Column (I) - Illustration Number (Illus No.). Thiscolumn indicates the reference number of the item asshown on the illustration.

6. Column (2) - National Stock Number. Indicatesthe National stock number assigned to the item and willbe used for requisitioning purposes.

c . Column (3) - Description. Indicates the Nationalitem name and, if required, a minimum description toidentify and locate the item. The last line for each itemindicates the CAGE (in parentheses) followed by thepart number.

d . Column (4) - Unit of Measure (U/M). Indicatesthe measure used in performing the actualoperation/maintenance function. This measure isexpressed by a two-character alphabeticalabbreviation; e.g., ea, in., pr.

e. Column (5) - Quantity Required (Qty Reqd).Indicates the quantity of the item authorized to be usedwith/on the equipment.

B-3

(1)ILLUSN O.

(2) NATIONALSTOCK

NUMBER

5985-01-274-5051

6130-01-274-0839

6135-01-274-5015

(3) DESCRIPTIONCAGE AND PART

NUMBER

Antenna AS-3960/PRC-127(80058) 071-l 299-30

Battery Charger(22373) 062-0103-05

Battery Pack,Alkaline(22373) 071-0056-02

(4)UflVl

EA

EA

EA

(5)QTY

REQD

Section II. COMPONENTS OF END ITEM - CONT

(1)ILLUSN O .

4

5

(2) NATIONAL (3) DESCRIPTIONSTOCK CAGE AND PART

N U M B E R N U M B E R

6140-01-274-0835

8105-01-276-4810

5820-01-274-5063

Battery Pack, Ni-Cd(22373) 200-3224-07

R/T Holster(22373) 071-0059-00

ReceiverflransmitterRT-1594fPRC-127(80058) 062-0118-00

(4)U / M

E A

E A

E A

(5)Q-w

REQD

Section II. COMPONENTS OF END ITEM - CONT

(1) (2) NATIONAL (3) DESCRIPTION (5)ILLUS S T O C K CAGE AND PART (4) Q T YN O . NUMBER NUMBER U/M REQD

6 5965-01-274-5016 Speaker/Microphone E A 1(22373) 071-3012-I 0

7 5965-01-292-8307 Speaker/Microphone E A 1C o v e r

ado SectCon III. BASIC ISSUE ITEMS

I

(1) (2) NATIONAL (3) DESCRIPTION (5)ILLUS STOCK CAGE AND PART (4) QTYN O . N U M B E R N U M B E R U / M REQD

NA 5826-01-2166-5966 Technical Manual E A 1TM 11-5820-l 048-l 0. .

APPENDIX DEXPENDABLE/DURABLE SUPPLIES

AND MATERIALS LIST

Section I.INTRODUCTION

D-l l SCOPE

This appendix lists expendable supplies and materialsyou will need to operate and maintain the radio set.These items are authorized to you by CTA-50-970,Expendable Items (Except Medical, Class V, RepairParts, and Heraldic Items).

D-2. EXPLANATION OF COLUMNS

a. Column (7) - /tern Number. This number isassigned to the entry in the listing and is referenced inthe narrative instructions to identify the material; e.g.,“Use lint-free cloth, item 3, Appx D.”

b . Column (2) - Level. This column identifies thelowest level of maintenance that requires the listeditem.

C - Operator/Crew0 - Unit Maintenance

D-l

c . Column (3) - National Stock Number. This is theNational stock number assigned to the item; use it torequest or requisition the item.

d. Column (4) - Description. Indicates the Federalitem name and, if required, a description to identify theitem. The last line for each item indicates theCommercial and Government Entity (CAGE) code inparentheses followed by the part number.

e. Column (5) - Unit of Measure (U/M). Indicatesmeasure used in performing the actual maintenancefunction. This measure is expressed by a two-character alphabetical abbreviation; e.g., ea, in., pr. Ifthe unit of measure differs from the unit of issue,requisition the lowest unit of issue that will satify yourrequirements.

D 2I

0ITEM

NUMBER

1

2

3

(2)LEVEL

0

0

0

(3)NATIONAL

S T O C KNUMBER

~~

6135-01-274-5015

6140-01-274-0835

7920-00-965-4960

(4) (5)DESCRIPTION U/M

Battery Pack, Alkaline(22373) 071-0056-02

Battery Pack, Ni-Cd(22373) 200-3224-07

Cloth, Lint-Free(81348) CCC-C-444

E A

E A

Y D

By Order of the Secretary of the Army:

CARL E. VUONOGeneral, United States Army

Chief of StaffOfficial:

PATRICIA P. HICKERSONColonel, United States Army

The Adjutant General

DISTRIBUTION:To be distributed in accordance with DA Form

12-36-E, block 8803, Operator Maintenancerequirements for TM 1 l-5820-1048-10.

'U.S.Gavernment Printing Office: 1991 - 512-085'40107