Figure 7-32.--Overa1l functional diagram.

Figure 7-32.--Overa1l functional diagram.

INTEGRATED

called station, via output transformer T3, volume control

INTERCOMMUNICATION SYSTEM

S25, and relay contacts K1, K4, and K3.

The main differences between the older intercoms

The integrated intercommunication announcing

system is installed in submarines to provide the services

and the fully transistorized units concern the connection

of both central amplifiers and intercommunication

of a remote loudspeaker (model S-223) and the addition

systems. The system has the capablitiy for the

of a hands-free position to the press-to-talk switch.

transmission of orders, information, alarms, and

Connecting the loudspeaker calls for some minor wiring

selected station-to-station calls. The modes of operation

changes, such as cutting the leads on the switch

it provides are as follows:

assembly. Complete instructions for connecting the

1. One-way broadcast of orders and information to

loudspeaker are contained in the manufacturer's

select areas of the submarine or to the entire

technical manual. When the press-to-talk switch is in the

submarine.

hands-free position, the calling station controls the

2. Group announcing systems for intercom-

transmitting or receiving function; the receiving station

munication between stations performing

common or related functions.

need not press the switch to talk.