[Elecraft] Receiving and demodulation

[lyle johnson]

> One of the interesting features of the K3 is that PSK31 and RTTY  operation 
>are part of the radio. Does that mean that the PSK31 and  RTTY demodulators 
>in the K3 control the AGC so that the desired  signal and only the desired 
>signal controls AGC?

The use of an SSB bandwidth "waterfall" display for PSK31 is a great example 
of using the wrong filter for the job, at least after you've established the 
QSO.  The Rx AGC gets pumped by strong signals inside the "roofing filter" 
bandwidth, as you've observed.

On the K3, when I am copying a PSK31 signal, I spin the selectivity right down 
to 50 Hz.  Then, the PSK31 signjal I am copuying is the only one inside the 
fitler bandwidth, and is the one driving the AGC.

73,

Lyle KK7P