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Consumer Electronics by S. P. Bali

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WIRELESS MICROPHONES

The ultimate in mobility is afforded by the wireless (radio microphone) because with this there is no connecting cable and the user is free to move around over a distance of several hundred metres. There are two basic types, one where the radio transmitter is contained within the casing of the actual microphone, and the other which takes the form of a slim pocket unit about the size of a wallet into which an ordinary microphone can be plugged.

The integral microphone/transmitter unit, Fig. 2.23, is rather larger than a normal gun microphone as batteries must be accommodated as well as the transducer and transmitter. In order to obtain sufficient power for the transmitter, the batteries are at least 9V, but the size limits ...

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