TM-9-2350-275-BD Battlefield Damage Assessment and Repair for M113 Family Download
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TM 9-2350-275-BD COMMUNICATIONS SYSTEM Procedural Steps (Cont): W . Turn the FREQUENCY TUNING 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 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. y. 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 VOLTA G E 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. aa. Repeat steps (s) through (w) to preset frequencies on settings 2, 3, and 4. NOTE Only two frequencies can be preset on Band I and two more can be preset on Band 11. Example: If the PRESET CHANNEL BAND SELECTOR (11) is set at Band I position for preset #1 and #2, only Band II frequencies can be selected for presets #3 and #4. Any combination of bands and presets may be used. ab. You are now ready to operate in the preset mode. Any time you want to select a preset frequency, simply turn the PRESET “CHANNEL/CONTINUOUS TUNE SELECTOR SWITCH (18) to the desired preset number. 11-36