See comments below:
----- Original Message -----
From: "VR2BrettGraham" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Saturday, January 01, 2005 9:37 AM
Subject: Re: [Elecraft] Question about KNB2 Noise Blanker
(GainreductioninNB2 posit...
W3FPR replied to KH6AT that gated noise blankers cannot be expected
to work when the noise pulse is insufficient to reach the gating threshold
& that more signal might improve performance when blanking weak
noise. Sounds reasonable, but...
I believe my other radios have gated noise blankers. They behave far
better than the KNB2 in my K2 - even on noise that presumably is what
the KNB2 was designed for (chain saws, dirt bikes & similar stuff that
might be encountered by backpackers) - regardless of strength.
Outside of the type of noise the blanker is tailored for, why would it
be that a number of folks using one particular radio with a gated noise
blanker (K2 with KNB2) find the performance to be lacking compared to
other radios also with gated noise blankers?
OTOH, many have reported that the K2 blanker is better. I don't know the
real answer, but I can guess that the gain of a particular receiver ahead of
the noise blanker would make a big difference. Multi-conversion receiver
designers have a lot more places to put the noise blanker (and more control
over the gain at that point) than is possible in a single conversion
receiver like the K2. Try the K2 NB with the preamp set on to see if that
makes any difference, you may be surprised.
73,
Don W3FPR
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