[Elecraft] Preamp, Attenuator on K2 #4901

[Margaret Leber]

W3FPR - Don Wilhelm wrote:

> Other than a faulty solder connection or an incorrect resistor value
> (R74, R75, R76, R77), I can think of only 2 things that might cause
> the PreAmp to not work - T6 could be connected incorrectly or the
> windings shorted together, or C146 may be faulty.  Try tacking a 0.01
> uF capacitor across R77 (bottom of the board) as a check for an open
> C146 and if that doesn't fix things, try rewinding T6.

>> -----Original Message----- I just finished K2 #4901 and it works
>> great.  The only thing I have a question on is the preamp setting.
>> When the annunciator is on over the preamp, it seems as though
>> background noise goes down and the signal strength is reduced.

Jim--

Definately what Don said. I was in exactly the same situation as you:

> Margaret Leber wrote:
> After reworking a couple of suspect joints in the preamp section and
> removing and reinstalling T6, the preamp in K2 1641 is now working.

73 de Maggie K3XS
Editor, Phil-Mont Mobile Radio Club Blurb - http://www.phil-mont.org
Elecraft K2 #1641


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