Tom,
Triple check C11 and C12 to be certain they are both 1200pF and that you
did not use the 120pF capacitor for one of them.
Build yourself an RF Probe. The schematic for one is shown in the K1
Manual Appendix on Troubleshooting. You can also purchase a kit from
Elecraft.
73,
Don W3FPR
On 3/23/2019 10:03 PM, Tom Johnson wrote:
I have exactly Mike Morrow's problem, and wonder if he ever got it resolved.
Mike, if you are still around I'd like to hear what your resolution was.
I am awaiting arrival of an RF Probe kit so I can do signal testing to
attempt to trace down my problem. In the meantime I have looked over my
board to the point it's invading my dreams, and I do not see any visible
problem with the installation of any of the parts, with special attention
to: Q9, Q1, R11, R12, L1, C2.
I did see that I had not firmly seated U1, and corrected that: I was hoping
that would do the trick, but it did not - still get the E42 code.
It just seems to me that as everything tested out fine up until the
installation of the L1 Toroid and the C2 capacitor (I'm using 68 pF disc for
the 80 kHz range), that the issue should be centered there. I've confirmed
the 33 turns on the toroid, and fiddled with the it's placement. I'm
wondering if the winding direction makes a difference in the functioning of
L1 - there is no picture of it in the manual, only a reference back to
previous toroids, and I have wound it to match them. I've also confirmed
continuity of the windings on L1.
Lastly, I will reveal my testing ignorance here by mentioning my multimeter
does measure frequency, but I am not sure if that applies in this case: ie,
would that function as an RF Probe if I understood how to use it?
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