[Elecraft] [K3] RX audio distorted on FM

[Ray Sills]

HI Bob:

Yeah... that's what I meant!  :)   There is that point where there is  
no further signal gain is possible.. i.e. hard limiting.  So, you are  
quite correct.

Thanks!

73 de Ray
K2ULR
On Nov 25, 2011, at 12:18 PM, Bob Cunnings wrote:

> Actually, no, not for FM. Just as you say, most FM receiver IF
> circuits run the circuit gain at maximum. Also, a conventional FM
> receiver IF contains one or more limiter stages. Quieting is not a
> function of reduced IF gain - it is  a function of the limiter.
> Quieting is observed as signal strength rises past the point where
> limiting begins, and full quieting occurs at the point at which the
> signal is strong enough to saturate the limiter so that no AM
> component remains.
>
> Bob NW8L
>
>
>> When the incoming station is "full quieting"... it's signal is so
>> strong that the IF gain is pushed down so much that the detected
>> audio is "quiet".. i.e. no additional band noise.. just the clean
>> audio to your speaker.  Same deal with FM broadcast receivers.
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