[Elecraft] K2: added KNB2, now mostly deaf.

[Peter Wollan]

Well.  I put in the noise blanker, and it was recognized, but receive  
was mostly deaf.  I checked the caps suggested in the manual, pulled  
the toroids and re-tinned them, and reheated all the solder joints  
with no improvement.  So I pulled the noise blanker, and tacked back  
in the resistors and W5 -- and it's still deaf.  Mostly deaf -- I can  
hear stations on 40, particularly with the pre-amp on, and one or two  
on 80 and 30.  It seems to be completely deaf on the higher bands,  
though that could be the weather.

The resistors R88, 89, 90 are just tacked in.  Could a bad connection  
there produce this?  Could it be a component somewhere nearby, maybe  
damaged while changing resistors?  Could I have knocked it out of  
alignment somehow?  I'm thinking that I should re-align next;  are  
there things I should check before doing that?

And is there a way to test the noise blanker without pulling the  
resistors and starting this all over again?  Tapping Q21 with a  
screwdriver didn't produce any audible noise (and still doesn't, with  
the NB out).

Lots of questions -- I'm sure grateful for the people on this list,  
who are so incredibly helpful.

K2 #5578, QRP, with SSB and tuner.

	Peter N8MHD