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.
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