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Sound-Powered Telephone Circuits - 12097_38
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Sound Powered Telephone Talkers Manual
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A Call Signal Station
CLASSIFICATION  OF  CIRCUITS Sound-powered  telephone  circuits  are  divided  into  three classifications  based  on  their  usage:  primary,  auxiliary,  and supplementary. Q10. What  are  the  three  classifications  of  sound-powered phone  circuits? Primary Circuits Primary  circuits  provide  communication  for  primary  control and operating functions associated with ship control, weapons control, engineering control, and damage control. Primary circuits are designated by the letters  JA through  JZ. (Specific  circuit designations are labeled on the front of each jackbox.) Auxiliary Circuits Auxiliary  circuits  duplicate  certain  principal  primary  circuits as an alternate means of communication if damage occurs to the primary circuit. The wiring of auxiliary circuits is separated as much as practicable from the wiring of the corresponding primary circuits. Auxiliary circuits have the same letter designation as primary  circuits,  except  they  are  preceded  by  the  letter  X. Examples:  XJA,  X1JV,  and  X1JG. Q11. What  special  precaution  has  been  taken  to  prevent simultaneous  damage  to  both  primary  and  auxiliary circuits? Q12. How can you tell the difference between primary and auxiliary circuit designations? Supplementary Circuits Supplementary  circuits  consist  of  several  short,  direct  circuits, such as those from the bridge to the quarterdeck or from the quarterdeck to the wardroom. Supplementary circuits, designated X1J  through  X61J,  are  normally  string  circuits.  Circuits  in 3-9

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