Re: K3 NR triggering

Posted by Bill W4ZV on
URL: http://elecraft.85.s1.nabble.com/K3-NR-triggering-tp3521099p3524344.html

Steve Ellington wrote

I just had a CW QSO on a noisy 80m. Here's what I noticed with NR set for
F1-3. BW set for 2.5 kHz.
QRN very loud! I pushed NR. Band goes almost totally silent. Calling CQ with
the bug was like being in TX mode but I was using QSK as always. Wow...Nice
and quiet. Then someone answered my CQ. On his very first DIT, the noise
level jumped up and stayed up throughout the entire QSO. It was quieter than
no NR at all but why should it stay that way???

Remember that NR is an adaptive filter.  When you perturb it with a coherent signal it rebuilds the filter around that signal.  F1 is the longest tap setting which means it has the greatest stored data stream and will take the longest to respond when you add new data (i.e. a signal).  Once the new input to the filter (signal plus noise) is steady state, the filter will then stay in that state until the inputs change again (i.e. when the signal goes away).

73,  Bill