Sennheiser EK3253 manual Squelch, Pilot tone squelch, Field strength-dependent squelch

Squelch

Pilot tone squelch

When set to stereo operation, the transmitter adds a 19-kHz pilot tone to the audio signal. The receiver checks incoming audio signals to see if the pilot tone is present. In the absence of the 19-kHz signal, the receiver’s audio output will remain muted, even if a strong RF signal is present.

This prevents strong interfering signals from causing hissing noise in the receiver when the transmitter is switched off.

Field strength-dependent squelch

Depending on the strength of the received RF signal, the receiver’s audio output is opened or muted. Via the “SQELCH” menu of the receiver, the squelch threshold can be adjusted in three steps (LO, MID, HI).

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