[Elecraft] K3 CW Auto Spot in 3.30 with NR turned on

[Lyle Johnson]

> I may have answered my own question. The signal amplitude drops with the 
> higher "F" settings and the dancing bar in the CWT display disappears more 
> quickly as I tune off frequency. When there is no visible dancing bar the 
> auto spot fails to work. There is no problem with stronger signals or if I 
> increase the filter bandwidth. My initial findings were with a 50Hz filter 
> bandwidth.
>   

As mentioned elsewhere, the F5-x through F8-x mix some unprocessed audio 
with processed audio.

Because the delay through the NR filtering is not deterministic, 
depending on pitch and other factors, you may notice an apparent boost 
in signal level at your chosen pitch, or a definite decrease in audio.  
The CWT is using audio information, so the observation you make is 
consistent with how the overall system works.  A different pitch may 
work differently at NR settings in the F5..F8 range.

In general, I suggest the use of F1..F4 for CW, especially if you intend 
to use the autospot feature.

73,

Lyle KK7P