[Elecraft] KNB2 diagnosis

[Sverre Holm]

K6DBG wrote
> Some of the time, my pulses just die at the output of R8, which goes to ground 
> via L1. I'm not sure exactly what I do differently when the pulse gets past - 
> perhaps just how hard I'm tapping?

Sounds strange, if you hear the noises coming through your K2 (with the NB off), they have to pass through the bandpass composed of 
L1 and L2 - all the time.

> If I have the NB turned off, the signal stops at pin 4 of U1 - I see pulses 
> there, but not at pin 1.

Is your U1 - MC1350 working? Have you measured DC voltages and check against the data sheet?


73

Sverre
LA3ZA

Unofficial Guide to K2 Modifications http://www.qslnet.de/member/la3za/K2/mod.html