[Elecraft] K1 dead band on 20M

Fri Sep 6 13:10:00 2002

I had these exact symptoms and it was a bad xtal. I happened to have ordered
a backup KFL board with 20M and used that xtal to verify my suspicions. Once
replaced, all was well.

73,
Scott AG4KU

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of COLIN WHITMORE
Sent: Friday, September 06, 2002 12:39 PM
To: Elecraft
Subject: [Elecraft] K1 dead band on 20M

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 scattered
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, transmit,
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 values.
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
figured I'd post this and ask if I may be missing something obvious. Any
suggestions? I just got a K2 and decided not to start on it until the K1 is
back to health. ;-)

72,
Colin
N�YGY

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