AKG MP 40 User Manual download pdf (Page 33)

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WMS frequency band with TV transmitter

If you are faced with interference caused by a television station, select the carrier frequency of the wireless microphone system such that there is a separation of at least 500 kHz from

the video carier, and 200 kHz from the audio carrier. Caution: changing a single carrier frequency may result in chaotic intermodulation in the entire multichannel system!

The Frequency Management Program from AKG provides a simple solu-tion to this problem as it automatically finds frequencies that wll not interfere with one another.

Intermodulation

The nonlinear characteristics of a transmission link may

cause intermodulation problems. Intermodulation produc-

ts do not increase linearly as f1 and f2 rise in amplitude

of, but significantly faster. 3rd order intermodulation arti-

facts are the biggest problem that beset wireless systems,

as they are strong enough to be clearly received.

Intermodulation

The simultaneous use of several radio sources results in

intermodulation products in the frequency spectrum. If, for

example, a third radio source (microphone) is used on the

same frequency as that of a 3rd order intermodulation