Audio Engineering

Microphone Technology 665

The microphone elements are fi tted with clips for attachment to the user’s clothing.
Occasionally, the microphone element may be part of a head microphone boom structure.

Typical transmitter features are:

1. Power on–off switch.


2. Carrier frequency selection and indicator.


3. Battery level indicator.


4. Audio gain control.


5. Audio overload indicator.


6. Audio mute switch on body pack units.


7. Nine-volt battery.

Receiver units may be stand-alone or rack mounted and are usually powered from
conventional power mains. Audio outputs are provided at both line and microphone levels.

A typical space diversity receiver providing assisted setup has the following features:

1. Power on–off switch.


2. Scan or operate control.


3. Carrier frequency indicator.


4. Squelch control.


5. Active receive antenna indicator.


6. Radio frequency level indicator.


7. Transmitted audio level indicator.


8. Transmitter battery life indicator.


9. Audio output level control.

A photograph of a space diversity wireless microphone system is presented in
Figure 22.13.