In display panel , the power of the received RF signal in (µV) and the level control of the AF signal � i.e. the modulation of the RF signal (in %) are shown. Both displays have an overmodulation display. If the signal is too high, the text �PEAK� lights up briefly. Short overmodulation is not critical. Where longer overmodulation occurs, the modulation of the corresponding transmitter must be reduced. For the AF signal, �peak hold� is also shown, which means that short peaks remain visible for some time.
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Squelch (Muting)
The EM 3031/3032 receiver is equipped with an adjustable squelch control which eliminates annoying noise when the transmitters are switched on and off. It also suppresses sudden noise when a transmitter leaves the reception area and there is no longer sufficient transmitter power received by the receiver. The squelch is adjusted on the rear of the receiver with control (�MUTING�). The adjustment range is between 0 and about 100 µV. When the squelch is active, the text �MUTE� is shown in display panel .
AF squelch
The squelch also switches on when the selected radio channel is occupied by a wideband interference signal such as that generated by lighting control systems. This prevents an interfering signal from hindering reception even when the interfering signal has a high RF level. When control (�MUTING�) is set to position �0�, the AF squelch is also switched off.
