AMFAMF
15 Advanced muting function
This receiver also features AMF (Advanced Muting Function). This special electronic feature
comes into effect when an RF signal drops by about 50 dB in a short time. The reception is then
muted for 3 seconds. AMF thus suppresses the annoying switch-off click when a transmitter is
switched off. Because of the delay in switching on again, the PLL circuit of the transmitter has
enough time to adjust itself back to the corresponding transmission frequency.
Example
One possible area of use for AMF is the inaudible change of a hand-held transmitter.
If the battery of the first transmitter has run down (display OLOW BATTO on the
receiver), a second transmitter is prepared on the same frequency: insert battery,
select transmission channel. Then the first transmitter is switched off, AMF switches
to mute and the second transmitter is immediately switched on. The PLL of
transmitter 2 stabilises itself, AMF switches on again. The whole procedure takes
place inaudibly in the background while AMF is switched to mute. Without AMF,
the switching off, switching on and stabilising of the transmission frequency would
have been audible in the form of possible crackles and whistling noises.
AMF can be switched off. As it is coupled with the setting of the normal squelch, its function is
cancelled if control (OMUTINGO) is turned to position O0�.
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ACEC
SENNHEISER
