TM-9-2350-273-BD

M48/M60 SERIES TANK, COMBAT FULL-TRACKED 105-MM GUN

TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; BATTLEFIELD DAMAGE ASSESSMENT AND REPAIR

  TM-9-2350-273-BD - Page 190 of 288

TM 9-2350-273-BD
COMMUMCATIONS SYSTEM
Procedural Steps (Cont'd)
h.
Turn the POWER SWITCH (23) and the DIAL LIGHT SWITCH (26) to the on (up)
position.
At this time the FREQENCY DIAL VIEWING WINDOW (5) and the
INDICATOR METER (12) will light. After the tubes are heated, a rushing noise will be
heard in the earphones.
Adjust the VOLUME CONTROL KNOB (16). for the desired
volume level.
Check the power supply in the receive mode by noting the reading on the
INDICATOR METER (12) and turning the VOLTAGE CHECK/OPERATE SWITCH (28)
clockwise to the 6,3B and the 150B positions.
The needle on the INDICATOR METER
(12) should be in the shaded portion of the scale for all three readings. If not in the
shaded portion, check the power supply for bad fuses and replace any bad ones.
CAUTION
The receiver
and transmitter
are tuned
simultaneously.
Do
not
operate
the
transmitter without using an antenna or
dummy load.
Transmitting into an antenna
base without connecting an antenna may
damage the transmitter portion of the radio.
j
=
Check the power supply in the transmit mode by placing the VOLTAGE
CHECK/OPERATE SWITCH (28) to the 1,2B position on the transmitter circuits portion
of the scale (approximately the 7 o’clock position). The INDICATOR METER (12) should
read in the shaded portion of the scale.
If not in the shaded portion, check the power
supply for bad fuses and replace any bad ones.
k.
Place the VOLTAGE CHECK/OPERATE SWITCH (28) in the 150B position by
rotating the switch clockwise.
Momentarily place the chest plate switch and the CVC
helmet or H-189 switch in the transmit position.
Note the reading on the INDIATOR
METER (12~ it should be in the shaded portion of the scale. Release the switches.
1.
Place the VOLTAGE CHECK/OPERATE SWITCH (28) alternately in the 250B
and 600B positions by rotating the switch clockwise.
To obtain an indication, it is
necessary to momentarily depress the switches to transmit. Both the readings should be
in the shaded portion of the scale.
.
Place the VOLTAGE CHECK/OPERATE SWITCH (28) in the operate # 1
(PAbOTA 1) position.
n.
Place the PRESET CHANNEL/CONTINUOUS TUNE SELECTOR SWITCH (18)
in either the I or II position. Position I will be used if the desired operating frequency is
between 20 and 35.75 MHZ and position II will be selected if the desired operating
frequency will be between 35.8 to 51.5 MHZ.
Band selections are also shown by the
BAND INDICATOR (13) lights.
11-35


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