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Section II.  Description of operation - TM-55-1930-209-14P-12_29
Commercial marine radios - TM-55-1930-209-14P-12_31

TM-55-1930-209-14P-12 Water Purification Barges (NSN 1930-01-234-2165) Lighting System Manual
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TM 55-1930-209-14&P-12 d. Make sure circuit breakers are closed (ON) for the radio equipment specified in the following' Radio Equipment Circuit breaker no. Panel Location Army radio 3P14 24 Vdc power panel Workshop on aft bulkhead Army radio 12P13A-4 Isolating Workshop on aft bulkhead power supply receptacle panel Marine radio 10P13A-8 Emergency light ROWPU space on forward and radio power panel supply starboard supply Walkie-talkie N/A N/A N/A battery charger 2-12    Operating  procedures.    Radio  operators  must  comply  with  FCC  and  Army  radio  communications  procedures when  operating  any  radio.    These  procedures  are  available  in  FCC  regulations,  Army  radio  training  materials  and SSI/SO.  They are not part of these instructions. 2-12.1  Army radio a. Perform following to turn on Army radio' (1) Turn power supply (Figures 2-5 and 2-) ac voltage selector switch to 115 V 50-60 400 cycle position. (2) Turn power supply POWER ON/OFF switch to ON Green ac ON indicator lamp should light. (3) Turn radio (Figure 2-6) BREAKER-RESET power switch to LOW. (4) Set radio LIGHT selector switch to ON so that LAMP and CALL control indicators come on. CAUTION Do not use following frequencies because they will cause improper operation of Army radio: 33.90 MHz, 45.20 MHz, 56.50 MHz, and 67.80 MHz. Do not use frequencies that are separated exactly by 5.75 MHz or 23.00 MHz. b. On Army radio (Figure 2-6), perform following to receive transmissions from another Army radio station: NOTE Radio  operator  must  obtain  assigned  frequencies  (primary  and  alternate),  network  and  call  signs  for barge radio and other stations to be contacted. Frequencies, call signs, and network organizations are obtained from SSI/SOI.  Unit headquarters provides extracts of SSI and SOI. (1) Turn BAND selector switch to either A or B position for desired frequency band. NOTE When  using  SQUELCH  control,  radio  background  noise  is  silenced  when  transmitter  is  not  keyed. Newer model FM radio sets use a squelch control which automatically disables radio squelch circuitry. For reliable communications, make sure that both distant radio stations and barge and workboat radio squelch  controls  are  in  same  position,  i.e.,  NEW  ON  or  OLD  ON.    If  unsure  of  distant  station  squelch control setting, initially tune with squelch in either OFF position. (2) For SQUELCH operation, turn SQUELCH control to either NEW ON or OLD ON, as appropriate. (3) Turn MC TUNE control to desired MHz frequency MC TUNE control provides manual tuning of radio in 1 MHz steps as indicated by outer section of dial window. (4) Turn KC TUNE control to desired kHz frequency KC TUNE control provides manual tuning of radio in 0 05 MHz steps as indicated by Inner section of dial window. 2-9







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