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Chapter 1 Introduction to Sound-Powered Telephones
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Sound Powered Telephone Talkers Manual (Revised)
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Operation of Sound-Powered Telephone Circuits - 14232_13
When you speak into the mouthpiece, the sound waves of your  voice  cause  a  diaphragm  to  vibrate.  The  vibrations  are transferred  from  the  diaphragm  through  a  drive  rod  to  an armature centered in a wire coil. The current then is transmitted to a receiver (the earpiece), where the process is reversed. The person  at  the  other  end  of  the  circuit  hears  the  sounds  you transmitted. The earpiece, though shaped differently from the mouthpiece, also contains a diaphragm, an armature, and a coil. The earpiece and the mouthpiece can be used interchangeably; you can talk into the earpiece or hear through the mouthpiece. This feature is important  to  remember  should  a  failure  occur  in  one  of  the pieces. It is also important because you need to be aware that an earpiece turned away from your head will pick up distracting noises. Q1. Q2. Q3. What  is  the  power  source  of  the  sound-powered telephone  system? How do yon generate enough current to carry your voice to all other phones in the circuit? What action should you take if your mouthpiece fails? IMPORTANCE  OF  SOUND-POWERED TELEPHONES Communications  are  of  vital  importance  to  a  shipboard organization. The  most  important  interior  communications system  used  aboard  ship  is  the  sound-powered  telephone. Without  this  system  to  exchange  accurate,  up-to-date  information, the ship would be unable to function properly and achieve its mission. Can you think of an instance in your past when you were given inaccurate information or you received it too late to be useful?  What  kind  of  problems  did  that  cause  you?  Imagine, then, commanding officers trying to lead their warships during a 1-2

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