K1 bad drift on 20m

[Tom Juelich]

Hi folks,

I am operating my K1 #1434 for more then 2 years now with a
2 band 40/20 and a 4 band module 40/30/20/17m.
Recently I discovered an drift problem on 20 (only 20) on my
4 band module. (Blue trimmer caps inside).
This problem occurs during RX and TX.First I thought the
station I am just receiving has a poor stability but then all
the stations on 20 sounded very bad.So I turned on my Icom 735
and listened to my own transmitting signal. The tone sounded really
rough.
I wonder if any one of you has ever mentioned this on just one
band of the K1.
I must add that my problem does not exist with the 2 band module
and it seems after some 45 minutes after turning on the K1 this bad
drifting disappears...

Thanks very much for thinking about it!
73 de Tom, DL2HRF



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[Mike Morrow-3]

Tom wrote:

>Recently I discovered an drift problem on 20 (only 20)
>on my 4 band module. (Blue trimmer caps inside).
>This problem occurs during RX and TX.
>
>I must add that my problem does not exist with the 2 band module

Tom,

I've never heard a problem like this reported on the K1.  About the only
thing it can be is the 20m hetrodyne crystal (X2) circuit on the filter
board.  I'd re-heat the solder connections at X2 and at pin 5 of switching
relay K2B on the filter board.

When your unit is drifting, you can use another receiver to listen to the
oscillation of X2 (within a few kHz of 22.000 MHz) to determine that the X2
circuit is the source of the drift.

73,
Mike / KK5F

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