[Elecraft] Question about KNB2 Noise Blanker

VR2BrettGraham vr2bg at harts.org.hk
Sat Jan 1 21:40:58 EST 2005


<htodd at twofifty.com> added:

>Er, I think people who don't have any trouble with it have no
>inclination to respond. While I don't think it's the best noise blanker
>I've ever used, my K2 is unusuable at my urban location without it.

True - as well as folks who are fortunate not to need to use the noise
blanker much, if not at all (my situation when I first started using my
K2).

>On the noise here (power line noise and also some weird industrial
>electrical noise) the noise blanker on the K2 works better than the
>noise blanker on the IC-706MKIIG.

I am frustrated this morning in not being able to measure the duration
of the noise pulses I have on 15 that the KNB2 will not touch but a
TS-950S' blanker does, which I suspect is from a power line as things
have been very cold & dry here (3-11C & 30-40% RH) recently.  As the
bands are not so good, I do not have constant S-meter indication from
out of band energy, so the noise amp should not be choked by the
AGC.  Is it not triggering, or is it that the noise gate is not triggered to
coincide with the pulses?  It is like it does nothing & this is the kind of
noise that from my experience is well within the capability of noise
blankers of other radios.

My KNB2 has blanked noise (so it probably is working normally), but is
very finicky about what it will work on.  It is likely I would not be able to
hear much of anything with my K2 from where I operate in 9M6, as last
time I was there there was S9 noise just like this everywhere.  This is
unfortunate, as there are other attributes of the K2 that are far superior
to my other equipment.

73, VR2BrettGraham



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