15A1. Description. The underwater sound
system consists of directional hydrophones,
supersonic high gain receiver amplifiers,
transmitters, range indicators and necessary
polarizers, rectifiers, motor generator sets,
motors and indicators, and the necessary control
gear. The circuit letters are SRT, S1RC,
and S2RC. The 120-volt direct-current power is
supplied directly from the forward battery
through 2 separately fused connection boxes,
one tapped into the jumper between cells 33 and
34, and the other into the jumper between cells
93 and 94. This circuit is brought to a polarized
single outlet receptacle in the after end, port
side, of the forward torpedo room near the amplifiers.
Power is taken through a line filter supplied with
the rest of the equipment, before
being fed into the amplifier, in order to reduce
noises that might otherwise be introduced from
the power supply.
The supersonic system obtains alternating
current from the ship's a.c. supply through
fuses and disconnect switches in the radio room.
The supply to the conning tower equipment is
taken through two 15-ampere fuses and a double
pole, single throw, snap switch.
Direct current is also taken from the auxiliary
power distribution panel in the forward
torpedo room through four 30-ampere fuses;
2 fuses feeding the motor controller panel for
the QB training MG set, and the other 2 feeding
the motor controller for the QC-JK training
Installations vary greatly and the ship's
plans should be consulted for details.