[Elecraft] K3 noise blanker

[Arie Kleingeld PA3A]

One more addition:

NB off, AGC PLS set to nor.
Bandwidth set to 400 Hz (with 400Hz roofing filter).

The pulse is back (about S5)working the agc.
Pulse is suppressed again at bandwidth 550 Hz (yes 550Hz, not 450Hz) or
greater (roofing filter = 2.1k at BW 450 Hz - 2100Hz)


Arie





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Onderwerp: [Elecraft] K3 noise blanker


All,
 
I''ve been playing with my K3 (#1255) for a week now and I'm getting the
feel of the controls.  Everything is OK but I'm still working on the
settings of the NB and the NR. Firmware 2.23 / 1.88
 
Now about NR.
I receive a S9 pulse from an electric fence. Getting rid of this was
easy with the NB of a FT1000MP, is impossible to get rid of with the K2
(still unmodified) NB and.... the pulse is very much suppressed (not
totally) in the K3 !  Wow. Thinking about earlier threads about static
noise and beating the "Rob Sherwood test on dsp radio's" on that
subject, I found the reason: AGC PLS is on. Boy, lucky me! Switching off
the AGC PLS brings back the electric fence pulse on S9.
 
So let's try the NB of the K3 on this.
IF NAR 1-7: no good result
IF MED 5: pulse pretty much gone, but...
IF WID 4: pulse pretty much gone, but...
DSP 1-1 to 3-4: very little result
 
So I'm able to suppress the pulse with the NB or with the AGP PLS
setting. The thing that worries me (and here is the but...)  is that
when I'm using the NB, setting in IF NAR/WID/WID x, and x>4, introduces
noise and signals that are not there without the NB on. So settings 5, 6
and 7 seem useless here. Anybody experiencing the same? Or did I miss
something?
 
 
73
Arie PA3A
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