[Elecraft] RE: K2 #4039 - Distorted transmit audio

[W3FPR - Don Wilhelm]

Nicolas,

I would expect a bit of 'modulation' on the 12 volt line due to the
resistance in the power supply leads and the connectors.  If you find yours
excessive, check all connections for the power leads and consider using a
larger gauge wire (or use a better regulated power supply if the modulation
is seen at the power supply terminals too.)

I would suggest checking the 5 volt and 8 volt for any trace of
'modulation' too - a faulty regulator could cause your problem - Q1 (which
drives the 8T line) could be another potential offender.

U10A and Q8 and their associated components in the ALC area are other
possible problem sources.

73,
Don W3FPR


----- Original Message ----- 
>
> The distorted audio moves with the Control board, so either K2 can enjoy
> distorted transmit audio, if it has the faulty board fitted!
>
> Just to clarify point 3. The 12v rail seemed to modulate on both K2's
> when using either the faulty ** OR ** the working Control board!
> As this effect is the same for both K2's with either Control board. This
> would seem to indicate it is some other measurement (etc) effect, that
> we are seeing?
>