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 192 of 288
TM 9-2350-273-BD
COMMUNICATIONS SYSTEM
Procedural Steps (Cont'd)
t.
Set the PRESET CHANNEL/CONTINUOUS TUNE SELECTOR SWITCH (18) to
the preset #1 position.
u.
Set the PRESET CHANNEL BAND SELECTOR (11) to correspond with the
desired band. Frequencies between 20.0 and 35.75 MHZ are set on Band I (switch up);
frequencies between 35.8 and 51.5 HMZ are set on Band 11 (switch down). Band
selections are indicated by the BAND INDICATOR lights (13).
v.
Open the PRESET LOCKING SCREW ACCESS COVER (19) on the front panel
and loosen the PRESET LOCKING SCREW (6) marked "1“ by turning the locking screw
counterclockwsie until the slot is at right angles with the red circle. To release the
preset locking screw, use the special key (not shown) attached to the case of the radio.
w.
Turn the FREQUENCY TUNING CONTROL KNOB (27) to the desired
frequency by aligning the desired frequency with the indicator line within the
FREQUENCY DIAL VIEWING WINDOW (5). While holding the FREQUENCY TUNING
CONTROL KNOB (27) turn the PRESET LOCKING SCREW (6) clockwise with the
special key until it is aligned with the red circle.
x.
Loosen the ANTENNA LOADING CONTROL LOCKING NUT (8) two or three
turns counterclockwise.
. Put the chest plate switch in the transmit position and hold. Turn the
ANTENNA LOADING CONTROL KNOB (9) for maximum deflection on the INDICATOR
METER (12) and maximum brilliance on the RF INDICATOR LAMP (7).
NOTE
Several peaks will be noted on the indicator meter while
loading the antenna.
Tune to the maximum peak and to the
maximum brilliance on the indicator lamp.
For a more
sensitive meter to help chooose between peaks, turn the
VOLTAGE CHECK/OPERATE SWITCH (28) to the operate
#2 (PAbOTA 2) position.
After determining the most
advantageous
loading position,
return the VOLTAGE
CHECK/OPERATE SWITCH (28) to the operate #1 (PAbOTA
1) position. Release the chest plate switch.
z.
While holding the ANTENNA LOADING CONTROL KNOB (9), tighten the
ANTENNA LOADING CONTROL LOCKING NUT (8). Check this step by depressing the
chest plate switch to the transmit position.
If the indication on the INDICATOR
METER (12) is not the same as noted in step (y), loosen the ANTENNA LOADING
CONTROL LOCKING NUT (8) and repeat step (y).
If proper loading has been
accomplished release the chest plate switch and proceed.
11-37
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