[Elecraft] K3s AFSK frequencies

[Ed Muns]

On RTTY, AF limiting doesn't occur because I run the AF Gain very low.  I
only need to hear the presence or absence of a RTTY signal.

On CW, I agree, because I turn the AF Gain up higher.  But, I also run a
lower AGC THR than I would on RTTY.  Thus, when changing modes between CW
and RTTY, it is easier to leave AGC setup for CW and just turn it On or Off
rather than go into CONFIG and change AGC THR.

For RTTY, though, slow AGC will yield a lower error rate than fast AGC with
the modern software decoders.

Ed W0YK
__________________________________________________________

Dave K6LL wrote:

>Ed is correct on this, but turning AGC off on the K3 causes 
>problems with loud signals due to the hard-limiting and 
>distorting action of the AF Limiter.  A better approach with the 
>K3 is to use fast AGC, AGC SLP=0, and AGC THR as high as 
>possible without causing a sound card overload warning on the 
>loudest signals.  For RTTY, with my usual gain settings, I find 
>that AGC THR = 17 works well. 

Ed W0YK wrote:

>>For RTTY, AGC should be Off, another conflict with conventional 
>>thinking.