Who needs a radio mic?

Radio mics give users the freedom to move around at ease - to talk, dance, sing or move about the stage, indoors and out, without trailing a cable behind them.

They are popular with singers, dance and aerobics instructors, comperes, interviewers, performers, indeed almost anybody who needs amplification but wants (or needs) to move around.

A brief description

To use a radio mic you'll need three things:-

• a microphone
• a radio transmitter (which sends your voice across the airwaves), and
• a radio receiver (which picks up the sound and sends it to the PA system).

A handheld radio mic (shown above) includes the transmitter in its body.

Headband and lapel microphones do not have room for a transmitter. Instead, the transmitter is in a "bodypack" connected by a lead to the headband/lapel mic. The bodypack can be clipped to convenient clothing.

The receiver may be built into the PA equipment or be in a separate box (as above) that can be plugged into the PA microphone socket.

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How it works

As you speak into the microphone your voice is sent across the airwaves by the transmitter - similar to a regular radio broadcast but over a very small area.

A receiver, connected to the PA equipment, picks up the radio signal so that it can be amplified.

It works just like a normal microphone, but without the cable.

Lapel or headband microphones are too small to include the transmitter, so in these cases a bodypack transmitter is used. It clips to a belt or waistband for convenience.