Figure 8-2.--Amplifier control panel.

Figure 8-2.--Amplifier control panel.

panel. This section contains the switch for energizing

this feature, you should turn off all local loudspeakers

the system, a power-on indicator lamp, an alarm reset

and keep the surrounding noise to a minimum.

indicator lamp, and four blown fuse indicators.

The mute-on switch disables the microphone

When the power-on switch is in the up position,

signal when the microphone is not in use. This switch

the system will be energized and the power-on

is also used to adjust the output volume of the

indicator lamp will be lighted.

microphone before using it. To adjust the output

volume, speak into the mike and adjust the volume

control until the signal just peaks into the red region

When an alarm is transmitted over circuit 1MC,

of the volume meter.

the alarm reset indicator lamp will light and will

remain lighted after the alarm has ceased. The entire

To interrupt a program using a microphone,

system will automatically be deactivated whenever an

switch the microphone selector to that channel.

alarm condition exists. The alarm reset indicator lamp

Switch the channel program selector switch to an

must be pressed to automatically reactivate the system

unused position and set the channel volume control to

following an alarm condition.

the minimum position. To add voice to a channel

program, switch the mike selector to that channel, The

The two 10-amp fuses are main system power

voice signal will mix equally with the other program

fuses, and the two 1-amp fuses are control power

material. To fade out the normal program, turn the

fuses.

channel volume control down.

MIKE CONTROL SECTION.-- The mike

To add voice to a tape recording, set the

control section is located on the left side of the panel.

microphone selector switch to the desired tape. Voice

This section contains a microphone input jack, a

and program can now be mixed and faded together as

selector switch to select routing of the microphone

described in channel operation.

signal, a mute-on switch, a volume control, and a

volume meter. Low- and medium-impedance

The microphone ALL CALL selector position is

microphones are used with the system. When using

a special function that interrupts all channels

8-3