[Elecraft] Inoperable KNB2

[John Reiser]

Hi Tom,

My KNB2 doesen't work either on a lot of things that I consider noise.  But, 
for that particularly nasty type of QRN, the loud crackling that sounds like 
frying a big pan of bacon, it works superbly.  My KNB2 takes that stuff out 
completely.

If I ever build another K2 (and I'm thinking about doing that) it will 
include the KNB2 for sure.

73,

John, W2GW

K2/100 #4970, KAT100-1, K1-6 #1205, KX1 #1258, etc.


----- Original Message ----- 
From: "Tom Skinner" <kj3d at verizon.net>
To: "'Elecraft'" <elecraft at mailman.qth.net>
Sent: Friday, February 17, 2006 4:47 PM
Subject: [Elecraft] Inoperable KNB2


> Hello Group,
>
> Well, you can add me to the list of folks who think their noise blanker is
> not working.
>
> Now I don't have a lot of noise problems, but do hear the occasional light
> dimmer or neighborhood power tool.
>
> I have tried the scratch test, but results were inconclusive.
>
> Today I brought home a 75,000 volt Tesla coil and lit it off across the
> room.  As expected, the noise level jumped from S1 to a bit over S9.
>
> The noise blanker has absolutely no noticeable effect in any position.
>
> I have re-inspected the placement of every component and confirmed every
> solder joint.  The preps on the RF board were done correctly.
>
> I checked the two diodes and they appear to be neither open nor shorted.
>
> The Tesla coil is probably overkill, but if the noise blanker is working
> shouldn't it have SOME effect?
>
> I really don't know what to check next - any suggestions?
>
> TIA es 72/73,
>
> Tom, KJ3D
> K2 # 4991
>
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