[Elecraft] KNB2 - looking for experience with mods that made it effective

[Fred Jensen]

Or electric fence noise.  Fence chargers pulse a couple of KV at roughly 
1 per second give or take a half-second.  When weeds grow up under the 
wire [they ALWAYS do :-)], the arc from the wire to the weed is a very 
short, fast rise-time pulse.

I have an electric fence.  The weeds grow for me about as good as for 
everyone else, leaving me two choices:  Walk the fence line through all 
the brush and weeds and fix the arcs, or let the NB take the noise out 
which it does very effectively, it just disappears and there are no 
audible artifacts in the rest of the audio.

OTOH, power line hash is a lot different [I have that too, the 69KV tie 
line between two hydro plants runs across the S end of the property], 
and when I get the NB to suppress "some" of it, the audio gets pretty 
raucous with all the holes being punched in it.

Nothing is perfect.

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2014 Cal QSO Party 4-5 Oct 2014
- www.cqp.org

On 10/9/2013 4:36 PM, Don Wilhelm wrote:
> Stan,
>
> As I indicated, slow rise time noises (like powerline noise) will not be
> squelched by the KNB2 nor the KNB1.  They will work on fast rise time
> noise pulses like from auto ignition noise or lightning, but will not
> work on continuous noise sources like powerline noise.