Upon completing this chapter, you should be able to do the
Explain the use and care of sound-powered telephone
Describe the different sound-powered phone circuits and
how they are designated.
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.
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.