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
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