In what position is that part? I assume it is Q9 feeding the mixer, U1.
Q9 amplifies the sample of the crystal board going back to the login board. The
PLL on the logic board sends a correction voltage back on the same connector D26
No properly working amplifier JFET should be so thermally sensitive as to cause
frequency shift. If this FET is thermally sensitive, it COULD easily prevent
proper level of sample signal from reaching the PLL on the logic board and
cause your frequency shift (or the lack of lock condition) so I think you are
on the right track.
Gary
> On Apr 8, 2018, at 6:10 PM, Peter Bertini <radioconnection@gmail.com> wrote:
>
> That comes with owning three which are into their sunset years... one of
> the three always has a new problem. Sigh. If must be nice to own a radio
> that works for a year or two before crashing.
>
> I found a J310 grounded gate RF amp that appeared to be heat sensitive, but
> that could be normal. I'm going to try a new J fet and see if that solves
> the issues on 160, 80/20 and 40 meters. Those three xtals are the ones
> that go out first.
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