[Elecraft] K1 dead band on 20M

[COLIN WHITMORE]

Ok, Ok, Ok, I know, DON'T HAVE A RADIO HOOKED UP WHEN AN ELECTRICAL STORM=
 IS NEARBY, but I was showing a guy my K1 and didn't realize that a scatt=
ered thunderstorm had scattered right near my house. Anyway I got zapped =
and incidentally so did the poor little K1. I disconnected everything and=
 waited until the storm had passed then fired up the K1 to give it a once=
 over. Everything checked out fine; full power on all bands, ATU, transmi=
t, receive, etc. Perfect, WHEW!

A couple of days latter I was going on the air for the Spartan Sprint. I =
hooked everything up and low-n-behold the ATU gives a PLO error on 20M. I=
 checked the other bands (40, 30 & 15) and the ATU tunes, the transmitter=
 transmits, and the receiver receives, just not on 20.

I pulled out the ATU, re-soldered R36, and jumpered pins 2 & 10 of J2. I =
attempted to re-peak the caps for 20 and still nothing; no power out, no =
receive in. I've checked all the relays, they're working fine. All of the=
 resistance checks for the KFL1 are good. U1 is OK as are its voltage val=
ues. Still all bands but 20 work so I don't think it's the ATU. Could it =
be the crystal?

I'm getting ready to build an RF probe to start signal tracing, but I fig=
ured I'd post this and ask if I may be missing something obvious. Any sug=
gestions? I just got a K2 and decided not to start on it until the K1 is =
back to health. ;-)

72,
Colin
N=D8YGY


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