[Elecraft] NB problem...one for the experts?

[Don Wilhelm]

Ron,

My best bet is that you will find something loose (or not soldered).  Most
likely on the NB board or the header that connects it to the RF board.  Yes,
I know you said it has been working there for 2 years, but sometimes
unsoldered connections behave like that - wait until just the right amount
of corrosion builds up on the metals, then ...

Basis for my conclusion - the AUX DC connectror is located right next to the
NB, and I surmise that with the KPA100 in place, the wires to that connector
put a bit of pressure on the NB board causing it to not work.  OK, OK, I
don't know why it works when powered from the QRP power connector?  Unless
you are removing the KPA100 when you make that test.

73,
Don W3FPR

----- Original Message ----- 

> Hi all,
>           I have a wee problem with the noise blanker in my K2.  It had
> been working fine, and it hasn't been taken out of it's mounting for
nearly
> 2 years now, but here is the problem.
> If I press NB I get the message "not inst"  or alternately, "instnot". :-(
> If I disconnect the power lead to the PA and plug the supply into the old
> supply jack I used pre-KPA100 days, the Noise blanker works fine again .
:-)
> Swap back to the supply via the KPA100 and it says "not inst" again. :-(
> The rest of the set appears to be working just fine whether the noise
> blanker is accepted or not.
> At the moment my tired brain cell can't wrap itself around that
> one......any ideas?
> Cheers......Ron ZL1TW
>
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