Radio Set Simulator Controls and Indicators

C2, TM 11-6625-564-12

Function

Control or Indicator

+27.5V

Connects the meter to the aircraft

power metering circuits.

+22.5V

Connects the meter to the ADF +225-

volt dc metering circuit.

Connects the meter to the AUX AUDIO

AUX AUDIO

metering circuit.

REMOTE SENS

Connects the meter with SENS control

circuit of the radio set control. Meter

reading varies from 0 to 8 as SENS

control is rotated.

SHIELD GND

Connects the meter to the shield ground

metering circuit.

VSWR CAL

Connects the meter to the forward

power metering circuit of the direc-

tional coupler for setting the VSWR

CAL control and connects +175 Volts

dc (MK-731/ARC-51X) or +27.5

volts dc (MK-731A/ARC-51X) to

uhf generator 1A5.

Connects the meter to the reflected

VSWR TEST

power metering circuit of the direc-

tional coupler to check the vswr of

the aircraft antenna and the rf feed-

line. Connects +175 volts dc (MK-

731/ARC-51X) or +27.5 volts dc

(MK-731A/ARC-5lX) to uhf gen-

erator 1A5.

Connects or disconnects the 27.5 volts dc to the radio set

P O W E R (two-position switch)

simulator,

Switch position

Action

OFF

+27.5-volt dc power is disconnected

from the radio set simulator,

RESET ON

Connects 27.5-volt dc power to the radio

set simulator.

Adjusts the output of the uhf test generator.

VSWR CAL.

potentiometer

Controls the volume to the headset from audio amplifier

AUDIO GAIN

No. 2.

potentiometer

Places load on the +27.5-volt dc power supply while

XMIT LOAD (two-position switch)

simulating XMIT conditions,

Switch

position

Action

Applies +27.5 volts dc to the XMIT

load circuit. The XMIT and XMIT

LOAD lamps should light.

OFF

Disconcerts the power source from the

XMIT LOAD circuit.

Causes the radio set simulator to generate a mock trans-

PTT (pushbutton switch)

mitting condition in the aircraft.

Switch

position

Action

Depressed

Turns on transmit portion of radio set

simulator, (if the TEST SELECT

switch is in a VSWR position) and

disconnects the ADF portion of radio

set simulator, XMIT lamp lights.

Released

Turns off transmit portion of test set,

(if the TEST SELECT switch is in

a VSWR position) and connects the

ADF portion of radio set simulator.