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i n t e r a c t i v e
Radio Set,AN /PRC-112
System Overview
Functional Data
PMCS
Radio Operation
Begin Program
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Begin System Description
Begin Equipment Description
System Description
Equipment Description
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System DescriptionThe Personnel Locator System AN/AYD-1
(PLS) consists of the airborne Radio-Set Person-nel Locator AN/ARS-6(V) (hereinafter referredto as the AN/ARS-6(V) and the ground-basedRadio Set AN/PRC-112. Using a predeterminedSurvivor ID Code, the AN/ARS-6(V) is designedto selectively locate and home-on a particularRadio Set. The Radio Set is capable of beinglocated with minimum action required from theoperator. The Radio Set is also capable of normaltwo-way communications. A Program Loader isused for pre-flight programming (consisting ofthe Survivor ID Code and two predeterminedfrequencies) of the Radio Set.
The AN/PRC-112 Radio Set functions as asurvival radio/transponder which receives aninterrogation on an assigned UHF frequency(225.00 to 299.975 MHz), and transmits a returnmessage on the same frequency. The Radio Setalso functions as a two-way radio for voice
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transmissions over Line-of-Sight paths. TheRadio Set transmits amplitude modulated (AM)voice on 121.5 MHz, 243.0 MHz, 282.8 MHz,Channel A (predetermined programmed fre-quency), or Channel B (predetermined pro-grammed frequency) as selected by the Radio SetChannel/Mode selector.
Mission success is dependent only upon theproper functioning of the operator's equipmentand the equipment on the rescue aircraft. Duringmost of the mission, the avionics equipmentfunctions as a transponder in response to interro-gation requests. This concept enhances thesystem's covertness and maximizes the operator'sRadio Set battery life. The avionics systeminterrogates the operator's Radio Set, therebyobtaining the range and direction to the operator.The pilot/copilot updates the avionics system byusing interrogations as the approach to theoperator is made. When the Search and Rescue(SAR) aircraft is within 1-3 nautical miles of theoperator, the pilot/copilot may put the avionicssystem in the continuous interrogation mode. The
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End System Description
Begin Equipment Description
operator(s) can then communicate with therescue aircraft providing they are not in a highthreat environment. If the operator is in a highthreat environment, silence should be maintaineduntil absolutely necessary.
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Equipment Description
ON/OFF/VOL ControlClockwise rotation of control turns the radio
set on and increases volume.
DME IndicatorUsed to indicate when receiver ID being
successfully interogated by a PLS avionicssystem.
Antenna Retaining SnapsUsed to secure antenna when not in use.
Speaker/MicrophoneUsed as a microphone while transmitting, and
as a speaker while receiving in voice mode. Inbeacon mode ( BCN ) it is a speaker only.
Battery LatchUsed to secure battery to radio set.
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Earphone ConnectorsProvides connector for earphone quiet opera-
tion in voice/beacon mode by disabling speakerwhen earphone is connected. Microphone inter-face is unchanged.
Channel/Mode SelectorPermits the operator to select the desired
frequency/channel mode indicated on the chan-nel/mode selector.Note
The control on the top of radio with indicatorarrow must be depressed when rotating channel/mode selector to beacon mode.
Push to Talk SwitchWhen pressed and held, permits operator to
talk on frequency selected. Cannot be used inbeacon mode.
End Equipment Description
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Begin Functional Description
Begin Modes Description
Functional Description
Modes of Operation
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Signal in/out
Power in
Audio out
Survivor IDcode and twopredeterminedfrequencies in
Functional DescriptionThe Radio Set functions as a survival radio/
transponder which receives an interrogation on apredetermined UHF frequency (225.000 to299.975 MHz in 25 kHz steps), and transmits aresponse message on the same frequency. Theinterrogation and response data are of a similarmodulation format. Data is transmitted usingboth amplitude and phase modulation.
A functional block diagram of the Radio Setis provided in the figure on the left. Duringoperation a modulated signal is received/trans-mitted through the antenna to/from the receiver/transmitter. Signal processing occurs within thereceiver/transmitter. Audio is output eitherthrough the speaker/microphone, or through theearphone if attached. Audio input is alwaysthrough the speaker/microphone. A replaceablebattery pack (not supplied) provides power to thereceiver/transmitter. The detachable ProgramLoader programs the receiver/transmitter with
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End Functional Description
Begin Modes of Operation
two predetermined frequencies and Survivor IDCode prior to Radio Set deployment.
Battery life for voice communications isapproximately 15 hours at 25° C ( 77° F ) with90% of radio usage spent receivingand 10%transmitting. While in beacon mode the batterywill provide approximately 5 hours of radiousage at the same temperatures listed for voicecommunications.
Signal in/out
Power in
Audio out
Survivor IDcode and twopredeterminedfrequencies in
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Modes of OperationTransponder Mode
The Radio Set functions as a transponder,detecting the interrogated ID code. If the ID codeis identical to that programmed into the RadioSet memory (Survivor ID Code), the Radio Setresponds by keying the Radio Set transmitter andtransmitting ranging modulation. The DMEindicator indicates the presence of a properlydecoded interrogation/response.
Emergency Beacon ModeThe Radio Set functions as a survival location
transmitter by transmitting an emergency beaconcompatible with conventional UHF AutomaticDirection Finding (ADF) equipment and the AN/ARS-6(V).
Voice Communications ModeThe Radio Set functions as a conventional
two-way radio by providing for voice transmis-
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sions over Line-Of-Sight paths. The operator cantransmit/receive voice on 121.5, 243.0 and 282.8MHz, or one of two predetermined frequencies inthe 225.000 to 299.975 MHz range.
End Modes of Operation
Back to Functional Description
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Begin PMCS General Information
Begin PMCS Procedures
General Information
PMCS Procedures
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General InformationOperator's Preventive Maintenance Checks
and Services (PMCS) are the scheduled inspec-tions and care required to keep the Radio Set ingood operating condition.
Except as noted, routine checks like equip-ment inventory, dusting, washing, checking forfrayed, cracked or broken cables, loose connec-tors, proper operation of control knobs andindicators are not listed as PMCS. These arethings that you should do anytime you see thatthey must be done.
All PMCS must be done as scheduled. If yourequipment must be in use all the time, check andservice those items you can without stoppingoperation. Perform complete PMCS when theRadio Set is off.
End General Information
Begin PMCS Procedure
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ProceduresInterval
Before operation ( B )—Do your B PMCS tobe sure the equipment is ready.
During operation ( D )—Do your D PMCSwhile you operate to help spot small problemsbefore they become big problems.
After operation ( A)—Do your A PMCS tohelp keep the Radio Set and Program Loader intop shape.
ProceduresTheprocedures column in the PMCS chart
tells how to do the PMCS. Follow these instruc-tions.
Equipment is not ready if:Equipment is not ready if: column tells why
the Radio Set cannot be used to perform itsassigned mission.
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IntervalItem to be inspected procedure: Not ready if:Item
B D A
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Front PannelClean the surface. Inspect for cracks,breaks, and loose or cracked earphoneconnectors.
Front panel iscracked or broken.Earphone connec-tor broken
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Continue PMCS
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IntervalItem to be inspected procedure: Not ready if:Item
B D A
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Rear Panel and CaseInspect for cracks, breaks, and loose ormissing screws.
Rear panel and.orcase cracked orbroken. One ormore screwsmissing.
• •2
Continue PMCS
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IntervalItem to be inspected procedure: Not ready if:Item
B D A
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Battery ConnectorInspect for worn or cracked contact.
Contacts worn orcracked.
• •3
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IntervalItem to be inspected procedure: Not ready if:Item
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ControlsCheck tightness of controls on shaft.Rotate and check for free operation, andproper detenting.
Any controls thatare missing, con-trol shafts thatbind, do not detent,or do not operatesmoothly.
• •4
Continue PMCS
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IntervalItem to be inspected procedure: Not ready if:Item
B D A
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PTT SwitchCheck Push to talk operation.
PTT switchcracked or broken.Boot ( PTT switchprotective cover )is missing ordamaged.
• •5
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B D A
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AntennaCheck th antenna for cracks or breaks.
Antenna is crackedor broken.
• •6
Continue PMCS
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IntervalItem to be inspected procedure: Not ready if:Item
B D A
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EarphoneCheck the earphone for cracks or broken
Earphone connec-tors are cracked orbroken. The con-nector is loose ortorn.
• •7 • •
Continue PMCS
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IntervalItem to be inspected procedure: Not ready if:Item
B D A
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Battery LatchCheck the battery latch for damage.
Battery latch hasvisable damage ordoes not functionproperly.
• •8
End of PMCS Procedure
Back to PMCS General Information
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Begin Operational Notes
Begin Operational Procedures
Operational Notes
Operation Procedures
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Operational NotesThe effective range of the PLS equipment can
be severely limited if the Radio Set is not in aline-of-sight path to the rescue aircraft. In con-junction with escape and evasion requirements,the operator should avoid positioning in a depres-sion and should position the Radio Set at thehighest point possible in order to obtain maxi-mum effective range.
When operating the Radio Set, keep theantenna in a vertical position. Do not point theantenna toward the expected location of therescue aircraft.
Pressing PTT switch while the Radio Set isactivly responding to interrogation (DME indica-tor blinking), will disrupt the ranging process.
End Operational Notes
Begin Operational Procedures
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Operation ProceduresRadio Set Operations
Set the antenna to its proper position forreception and transmission of radio signals. Setthe Radio Set ON/OFF/VOL switch to ON.Adjust the ON/OFF/VOL switch to a comfort-able audible level, or mute the Radio Set speakerby connecting the earphone.
Transmit a 121.5 MHz BeaconPress down on the Channel/Mode Indicator
switch to release the lock, and rotate selector to121.5 BCN.
Transmit a 243.0 MHz BeaconPress down on the Channel/Mode Indicator to
release the lock, and rotate selector to 243 BCN.
Press down onChannel/Modeindicator to selecteither beaconfrequency
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Transmit Voicea. Position Channel/Mode Selector to the de-sired channel and mode as listed below:
121.5 International Distress Frequency243.0 International Distress Frequency282.8 Search and Rescue (SAR)A Predetermined programmed frequencyB Predetermined programmed frequency
b. Press and hold PTT switch.
c. Speak into speaker/microphone.
d. When message is completed, release PTTswitch.
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Receive Voice or InterrogationRotate Channel/Mode Selector to desired
channel and mode. If the Radio Set is receivingcorrect interrogation signal, DME indicator willblink for approximately eight seconds.
CautionPressing PTT switch while the Radio Set is
active (DME indicator blinking), will disrupt theranging process.
Quiet Operation of the Radio Seta. Remove earphone from bag,textile.b. Attach earphone to earphone connector , andplace earphone in your ear.c. Transmit or receive as described. The speakeris muted while the earphone is connected to theRadio Set, but the microphone is unchanged.
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To Turn the Radio Set OffSet ON/OFF/VOL control to OFF.
Secure Antennaa. Rotate antenna 180°.b. Fold the antenna around the case.c. Snap the antenna to the antenna retaining
snaps
CautionDo not use secured antenna as a Radio Set
handle.
End Operational Procedures
Back to Operational Notes