Topband: K3 & some interesting noise lessons in the ARRL 160.

[Richard Karlquist]

On 2013-12-16 03:29, Greg wrote:
> Why would the NB null be frequency dependent?  Why does it change?  Why
> would a different antenna make any difference unless you pick up 
> different
> noise sources with the two different antennas?  73, Greg-N4CC
> 
> That's 1831 was UNoccupied, so I used it as a run frequency. No one 
> else was
> using it as a run frequency.
> 
> The noise blanker, at that time, with aforementioned settings, was 
> producing
> a very effective null in the noise at 1831-1833.  There were vacant
> frequencies in that range, vacant at various times, and I used them, in 
> the
> process breaking the dx window rule.
> 
> The combination of NB settings and the 250 Hz width (with 250 8 pole
> filter) on the K3 was NOT being falsed by nearby frequencies, nor was 
> it
> "mushing" the noise over weak signals, that discovered by a few hours
> messing with settings.

I'm still confused.  Did you pick 1831 because the NB worked better
there than elsewhere, or did it work the same, and you just wanted a 
clear
run frequency?  I'm trying to understand if the NB worked better on
1831 because of the lack of nearby signals that would cause false
blanking, or if it worked as well anywhere in the band.  My FT1000
would definitely work better in the lightly occupied DX window.

Rick N6RK