[Elecraft] K2 Transmitter Oscilation Problem

[Frank Jonischkies]

Ron,



> Continuing saga on checkout of this K2.  Transmit goes to 20 watts at
5.1A.
> RF out set to minimum
>
> VALC = O DC V on transmit.  This may be right since the power is running
> away?
> U9 buffer DC V OK, NO RF RMS on transmit
> U10 mixer DC V OK, NO RF RMS on transmit
> Q5 Collector = 4 V RMS RF on transmit !!!

Q5 is a 2N7000 and if blowen, no sidetone.

I had a problem with a blown Q4 so that the 8R line was still on during
transmitting. No power reduce possible and 'MaxCurr' in display. Check the
signals 8R and 6T and the Q23.

73 de Frank, DH8JF