Re: K1 building problem - VFO not working
Posted by
Mike Morrow-3 on
Aug 22, 2012; 2:26am
URL: http://elecraft.85.s1.nabble.com/K1-building-problem-VFO-not-working-tp7561287p7561449.html
Don wrote:
> Check your transistor numbers. K1 Q1 is a 2N7000 FET and not a 2N4124.
> The ZVN4424 goes in the T-R switch at location Q4.
Stan was referring to Q1 on the front panel board, which is the frequency
counter amplifier, 2N4124. This could cause the problem as described,
so I would hold off on a wholesale rework of the VFO circuitry until the
frequency counter sensing path is repaired.
The VFO itself may likely be operating properly, but just not being sensed
by the FP-MPU. In that case, the VFO signal should be able to be heard in a
receiver covering about 2.9 to 3.1 MHz (for 170 kHz VFO span). Lacking a
receiver, the filter board should be able to be peaked to where static
and signals are heard...one just won't know what the exact frequency is
until FP-Q1 is fixed.
73,
Mike / KK5F
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