Earlier on we used to have Audio mikes that used cables to transmit the audio signals. Long since these have been replaced with wireless or radio mikes that use frequency based transmission technology. They operate through radio waves and can transmit audio signals in FM, AM, UHF, VHF and various digital formats.
The advanced mikes are equipped to enable you to select a particular frequency band to transmit the signals from the mike so that it does not interfere with any other transmitter that can be operating on similar frequency. Coupled with this you are also able to use multiple microphones at the same time.
Nady Systems holds the honors of having built the first compander microphone that was built in 1976 and the current radio microphones owe their origin to him. He was honored with an Emmy award in 1996 for his contribution to the technology field.
Today wireless mikes have made it very easy and convenient for users to use while performing. Unlike the mikes with cables running all over the place, the wireless radio mikes are safer to operate.
The wireless Radio mikes have made it very comfortable and easy for performers to use. Today they are not hassled with having to drag cables across the stage and are able to move freely across the entire stage without being bothered. Even the handling staff need not bother with joining cables and managing the cables etc.
Though the Radio mikes are very good and advantageous to have, the draw back seems to be the fact that the two way radio batteries tend to get drained very fast and do not last long. The radio microphones guzzle power fast and in large amounts.
One other shortcoming could be the limited range within which the radio mikes operate. To get wider range you would have to buy higher models. There is also the risk of signals getting disrupted due to any other appliance or equipment operating within the same range.
You will often have to limit the number of microphones that you use, to ensure clarity and clear frequency without clash.
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