Description of Front Panel Controls, Indicators, and Receptacles-continued

TM 11-5820-509-12

Control. indicator.

or receptacle

Function

Control. indicator,

Sw pos

Function

POWER 5A AC fuse .................... A 5-ampere cartridge-type fuse that

or receptacle

ON /OFF

Power on and

protects the primary power source

lights off.

circuit when an ac input is connected

ON /LO

Power on and

to the receiver-transmitter POW E R

lights low

connector.

ON /HI

Power on and

KILOCYCLES indicator

A digital display that indicates the

lights high

operating frequency to which the

AUDIO connectors ....................... Parallel-connected

receptacles

for

Receiver-transmitter is tuned.

connecting voice and telegraph

BATTERY TEST push-

input/output devices. When either

button........................................ Can be used for two applications: during

connector is not used, install connector

power source checking, pressing the

protector.

pushbutton allows the operator to

VOLUME control ......................... During receive mode, controls received

determine if the input power source is

audio output level; during transmit

within limits (white area on XMTR

mode, controls sidetone level in

OUTPUT meter); during emergency

input/output device.

operation, pressing the pushbutton

POWER AMPLIFIER

Matches power amplifier output

allows the operator to bypass an

TUNE control.

impedance to antenna (input circuit

overtemperature relay to allow

adjustment) as monitored on XMTR

transmission continuation.

OUTPUT meter during power

CW-FSK/VOICE

Controls high voltage power

amplifier tuning.

switch (2-position

supply for transmission

POWER AMPLIFIER

Matches power amplifier output

toggle.

Sw pos

Function

LOAD control

impedance to antenna (output circuit

CW-FSK

Directly

ener-

adjustment) as monitored on XMTR

gizes the high

OUTPUT meter during power

voltage supply

amplifier tuning.

VOICE

The high voltage

LOCK knob .................................. Locks the turns counters of POWER

supply

AMPLIFIER TUNE and POWER

enabled

AMPLIFIER LOAD controls to

other switches.

prevent them from moving from their

Grounding terminals .......................... Used as grounding points for

optimum settings.

the ground-plane radials

XMTR PWR switch (3-

Controls power amplifier output:

POWER connector........................ Receptacle for connecting the power

position rotary).

Sw pos

Function

input source to the receiver-

Selects reduced

transmitter. Accommodates both ac

power output.

and dc power cables

OFF

Disconnects

Frequency control knobs ............... Selects operating frequency as displayed

power

on KILOCYCLES indicator

amplifier from

Control

Function

high

voltage

Left knob

Selects

the

power supply

thousands

Selects maximum

digit indicator.

power output.

Center knob

Selects

the

M ADJ control ............................. When rotated clockwise during power

hundreds and

amplifier tuning only, increases

tens

digit

sensitivity of XMTR OUTPUT meter.

indicator.

OPR-TUNE switch (2

Controls high-voltage power

Right knob

Selects the units

position toggle)

supply:

digit indicator.

Sw pos

Function

POWER/LIGHTS

Controls power and lights on/off

OPR

During radio

switch(4-position

functions:

set operation,

rotary).

Sw pos

Function

the high

OFF/OFF

Power off and

voltage supply

lights off.

is enabled by

other switches.

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