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Page Title: Chapter 3 The Sound-Powered Telephone System
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CHAPTER 3 THE SOUND-POWERED TELEPHONE  SYSTEM LEARNING OBJECTIVES Upon completing this chapter, you should be able to do the following: Explain  the  use  and  care  of  sound-powered  telephone equipment.    Describe the different sound-powered phone circuits and how  they  are  designated. SOUND-POWERED TELEPHONE EQUIPMENT As a sound-powered telephone talker, you must be familiar with the use and care of all sound-powered equipment if you are going to be proficient at your job. In addition to headset-chestsets and  handsets,  sound-powered  equipment  includes  jackboxes, selector  switches,  and  call  signal  stations. THE  HEADSET-CHESTSET Sound-powered  telephone  headset-chestsets  (fig.  3-1)  are designed for general shipboard use. The mouthpiece (transmitter) is suspended from a yoke attached to a metal chest plate. The earphones (receiver) are connected by an adjustable headband. The  mouthpiece  and  earphones  are  connected  by  wire  (tinsel cord) from a junction box on the chest plate. The plug cable is also connected into this junction. The jack plug is connected to the other end of the cable. 3-1

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