[App_rpt-users] Something is rotten in the state of Denmark

Ken ke2n at cs.com
Sun Mar 31 01:33:08 UTC 2013


I suppose it could but that would make no sense because the receiver uses
this high freq noise to operate its own squelch. You may want to play with
the squelch setting a bit.

GeorgeC

A typical hardware squelch, using, for example, the MC3361, takes the output
of the discriminator puts it though a small capacitor (which acts like a
high pass filter) and runs it through a "noise amplifier" before applying it
to the level detector.  The discriminator output of this same detector
circuit taps off before the noise amplifier and will likely have some low
pass filtering - intended to scrape off the 455 kHz AC - but probably will
reduce the level of signals in the 10-20 kHz range somewhat...


Ken




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