[Elecraft] Question about KNB2 Noise Blanker (Gain reductioninNB2 posit...

[Bryce A. Carr]

Hi Don,
I agree, but as Mike, KK5F,  pointed out, and I also noticed with my old
TS-830S and TS-140S, when using the same receive only phased loops both of
those rigs work fine at that low level and the K2, even with K2 preamp on,
doesn't.
 It would be a better idea to put more gain in series with the NB pulse amp
and put a nb level control on it so it will work as well as the antique
gear.
I have dxcc on 160m from a city lot and noise blankers are a big thing in my
life. Hi.
          Aloha,
               .Bryce, kh6at
----- Original Message -----
From: "W3FPR - Don Wilhelm" <w3fpr at earthlink.net>
To: "Bryce A. Carr" <kh6at at gte.net>; "Mike Morrow" <kk5f at earthlink.net>;
<elecraft at mailman.qth.net>
Sent: Friday, December 31, 2004 1:14 AM
Subject: Re: [Elecraft] Question about KNB2 Noise Blanker (Gain
reductioninNB2 posit...


> Bryce,
>
> Certainly, when the noise pulse is not strong enough to reach the gating
> threshold, no blanking will occur.
> The solution is to add a preamplifier.  In some cases it will be
sufficient
> to just turn on the preamplifier in the K2, it does depend on the Rx
antenna
> output level.
>
> Any gated noise blanker will have similar behavior, it is not unique to
the
> K2 implementation.
>
> 73,
> Don W3FPR
>
> ----- Original Message -----
>
> > Amen! The K2 NB is particularly poor when using low level rx only ants
as
> > noise pulses are heard in audio, but are not adequate strength to
trigger
> > the blanking mv.
> >  Aloha,
> >            Bryce, kh6at
>
>
>