Table 2-1. Operator's Controls - TM-11-6625-2609-120019

TM 11-6625-2609-12

Table 2-1. Operator's Controls-Continued

Contol, indicator, switch, or jack

Function

RECEIVERS switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selects receiver to be connected to transmit-interphone

selector.

VOL control, intercom control . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjusts volume of the intercom control amplifier.

AUDIO switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Turns the AN/ARC-134 audio output on and off.

SQUELCH DISABLE switch . . . . . . . . . . . . . . . . . . . . . . . . . . . In the ON position, the AN/ARC-134 squelch circuit is

disabled, permitting signal levels below the squelch thresh-

old to be heard.

EXTERNAL SQUELCH switch------------------------- In the ON position, the AN/ARC-134 squelch can be ad-

justed by means of the test panel EXT. SQUELCH

CONTROL.

EXT. SQUELCH CONTROL------------------------ Adjusts the AN/ARC-134 squelch when the EXTERNAL

SQUELCH switch is set to ON.

Indicator lamps 28.7 VDC------------------------------------ Lights when 28.7 vdc is applied to the maintenance kit and

the POWER CB circuit breaker is set to ON.

P T T - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Lights when PTT switch is activated.

P T T switch---------------------------------------- Keys the AN/ARC-134 when set to ON.

MIKE jack

Provides circuit connections for keying and modulating the

AN/ARC-134 with an external carbon microphone.

Provide connections to a 100-ohm input circuit for modu-

MIKE INPUT jacks

lating the AN/ARC-134 with an external audio test

signal.

DBM INPUT jacks

Provide connections to a 500-ohm center-tapped microphone

input circuit for modulating the AN/ARC-134 with an

external audio test signal.

DATA LINK INPUT jacks----------------------------- Provide connections to the ATCSS (Air Traffic Control Sig-

naling System) input circuit for modulating the AN/

ARC-134 with an external audio test signal.

Provides a headset connection.

RECEIVER Jack- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

RECEIVER-OUTPUT jacks--------------------------- Provide connection for an audio voltmeter.

DATA LINK-OUTPUT jacks-------------------------- Provide connections to the ATCSS output circuit in the

AN/ARC-134.

SIDETONE jack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Provides a headset connection.

SIDETONE OUTPUT jacks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Provide connections for an audio voltmeter.

D E T INPUT jack---------------------------------- Used to connect the AN/ARC-134 output to the input of a

detector circuit in the maintenance kit.

DETECTOR METER jacks---------------------------- Provide connections from the output of a detector circuit

in the maintenance kit to an audio voltmeter, permitting

measurement of the AN/ARC-134 modulation level.

S C O P E OUTPUT jack----------------------------- Provides a connection from the output of a detector circuit

in the maintenance kit to an oscilloscope, permitting the

AN/ARC-134 modulation to be observed.

INPUT CURRENT meter---------------------------- Measures current drawn by the AN/ARC-134.

INPUT VOLTAGE meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Measures primary voltage applied to the AN/ARC-194.

P l u g , Connector U-94A/U---------------------- Provides connection for Headset-Microphone H-157/AIC.

Provides PTT switch for keying the transmitter of the

AN/ARC-134.

Section III.

OPERATION

2-5. Preliminary Starting Procedure

tor clips) to primary power supply. Turn on

power supply and set to 28.7 volts dc.

Perform the operation listed below before start.

ing the equipment.

2-6. Starting Procedure

a. Set the transmit-interphone selector switch

To start the equipment, make sure the controls

position PVT and the RECEIVERS switch 3

are set as required by the preliminary starting

to ON. Set another switches on the maintenance

procedure (para 2-5). Perform the procedure

kit to OFF.

given below.

b. Adjust VHF COMM VOL control fully

a. Set the POWER CB circuit breaker to ON.

clockwise.

On the maintenance kit, the 28.7 VDC lamp, panel

c. Connect primary power cable (two alliga-

lamps on the radio control, and panel lamps on

2-3