Figure 7-19.--Block diagram of a power amplifier.

Figure 7-19.--Block diagram of a power amplifier.

Figure 7-20 is an illustration of an IC/MSB-2

detachable microphone with a press-to-talk switch,

microphone control station. Microphone control

loudspeaker group control switches, busy indicator

stations are self-contained, bulkhead-mounted units

lights, and a volume indicator meter.

with a hinged cover guard. The stations consist of a

MICROPHONE.-- A magnetic type of micro-

phone is used with the IC/MSB-2 microphone control

station. This microphone is equipped with an 18-inch

cable and a plug. The microphone plugs into a

receptacle mounted in the bottom of the station. A

tapered holder, mounted on the front panel of the

station, holds the microphone. When using the

microphone to transmit, you may remove it from its

holder or leave it in the holder. To use the

microphone, you must depress the press-to-talk

switch located on the microphone to transmit. When

talking into the microphone, you should hold the

microphone one-half inch from your mouth and speak

directly into it in a normal tone of voice.

LOUDSPEAKER GROUP CONTROL

SWITCHES.-- There are five circuit 1MC

loudspeaker group control switches and one

circuit 6MC loudspeaker group control

switch mounted on the front of microphone

control station 1. Stations 2 through 6 will

contain circuit 1MC loudspeaker group

control switches only. These switches are

used to select which loudspeaker group(s)

Figure 7-20.--IC/MSB-2 microphone control

is/are to receive the announcement being

station.

transmitted from the microphone control

7-17