Telex PROCOM2 User manual

PROCOM

AIRCRAFT INTERCOM

USER INSTRUCTIONS

INSTALLATION

(Referto the SystemConfigurationdrawing)

Plugthe ProCom2 (PC2) intothe aircraftradioor audio paneljacks.

NOTE: Ifthe aircraft radio does not providesidetone, the pilotwillnot be ableto hear himself or herself

inthe headsetduringaircraft-to-towertransmissions.

Plugpilotandcopilot (or passenger) headphone and microphoneplugsintothe appropriatejacks onthe top panel

of the PC 2.

PushTo Talk

(PlT)

SwltchNotes

1. If the aircraft hasabuilt-inpilotyoke switch, it is not necessaryto usethe pilot PTTjack onthe PC

However,

isimportantthat the aircraft radioor audio panelmicrophonejack tip

wired so that

keyingthetransmitterwith the built-inyoke switchwill also groundthe jack tip. This signal isthen

sensedby the PC

(viathe Ytable microphone/PTTplug)to cause properoperationof the intercom

duringtransmission.

2. If the aircraft has abuilt-incopilot yoke switch, it should not

used. lf copilot PTTcapability is

desired,use a portable PTT switchpluggedintothe copilot PTT switchjack onthe PC 2.

3. If poltable

PTT

switches are used,

not plugmicrophonesintothem, as the PTTswitches willhave

pressedtotalkoverthe intercom. Plugmicrophonesintothe PC 2 microphonejacks only.

Connectanextemalmsicsource tothe rearpanelMUSIC INPUTjack of the PC 2usinga 0.140-inch (3.6 mm)

stereo "miniplug."

Use one of two methodsto providepowerto the PC 2 intercom:

Forinternalpoweroperation, installa9-~0ltbatteryinthe side compartmentof the PC 2.

Forexternalpower operation, use an optional aircraftcigarettelightercable (TelexCatalogNumber96513-

000). Itisrecommendedthat you use a 100 mA (fast blo)fuse inthe externalpower source. Plugthe cable

intothe aircraftcigarette lighterand intothe AUX POWER jack onthe rearpanelof the PC 2.

CAUTION

Ensurethat the polarityof the externalpower isas shown inthe figure

below. lrrpmperconnectionmay result indamageto the PC 2.

AUX POWER

12-28VDC

100MA

Telex

Communicalions.

Inc.

All

tights

resewed.

TELEX,

AIRCRAFT

CIGARETTE AIRCRAFT RADIO MUSIC

LIGHTER OR AUDIO PANEL SOURCE

opTloNA$

PHOY

POWER Y-CABLE

CABLE

--$/

%%-*

nnra

go&

PILOT HEADSET COPILOT HEADSET

/-7

REAR

VIEW

PORTABLE

PILOTPTT

SWITCH PORTABLE

TOP VIEW COPILOT

PTT SWITCH

SystemConfiguration

OPERATION

Leavethe aircraft radioandmusicsourceoff, and set the PC

lockingpower switchtothe ONpositionby pulling

outwardonthe switchandpushing

upward.

TumtheSQ (squelch)controlfully clockwise.

NOTE: This is nota "hot mic"position, but it isthe positionwhere minimumvoice levelwill be required

to activatethe intercom.

While talking into pilotandcopilot microphones,adjust the PILOTVOL andCOPILOTVOL (headphonevolume)

controlsasdesired.

Tum onthe music source. If the musicsource has avolume control, adjust it for the desired listeninglevelinthe

headohones. If the music source does not have avolume control. the levelmav be adiusted usinathe MUSIC

trimnier onthe rear panelof the PC

Talk into a microphoneand notethe amount of music mutingduringtalk. If more or less muting isdesired, adjust

the MUSIC MUTEtrimmeronthe rearpanelof the PC

Turn onthe aircraft radio, and adjustthe cabinspeakervolumeto an acceptable listeninglevel (thiswill establish

a nominal inputvolume levelforthe intercom). Notethe radiovolume when listeningwiththe headphones,and

compare

tothe volume levelwhentalkingon the intercom. Ifthere isa

differenceinlevels, adjustthe equalizationtrimmer (labeledRADIO)onthe

rearpanelof the PC 2 untilthe radiilevelisthe same asthe intercomlevel.

Set the powerswitchto OFF (FAILSAFE)whenthe intercomisnot inuseto

consewe batterypower. Inth'is positionthe pilotphonesareconnected

directlytothe radio (the pilot microphonesignalisalways connectedto the

radioexceptwhencopilotistransmitting).

RearPanelTrimmer Controls

AUTOMATIC SQUELCHOPERATION

The PC 2containsanautomatic squelchcircuitwhichmakesmost manual

squelch adjustments unnecessary. This circuituses a built-inmicrophone

to monitorthe noiselevelinthe aircraft. The microohoneis locatedonthe

top panelof the PC2 nexttothe pilotMICand

PHONE

jacks. For proper

operation, do notobstructthe microphone.

Inmost casesthe manualsquelch controlshouldbeleft inthe extreme

clockwise ~osition.andthe automatic sauelchcircuitwillcomoensatefor

mostchan'gesinambient noiselevel; hdwever, ifthe ambieninoise level

duringoperationof the aircraftbecomestoo loud and causes undesirable

intercomactivation,rotatethe squelchcontrol slightlycounterclockwiseuntil

the intercomaudio tums off. The intercomshould reactivatewhen speaking

intoeithermicrophone. SquelchCircuit

Microphone

ACCESSORY INFORMATION

OptionalAircraft PowerCable

...............................

CatalogNo. 96513-000

2-Foot (0.6 m), withCigaretteLighter Plug

ModelPT-300 Push-To-TalkSwitch

..........................

CatalogNo.63966-000

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