[Milsurplus] Collins 618T-3 question!

[Tomas Rinman]

Hi
I am a Swedish ham and I am using the Collins 618T-3 since many years with great progress! During tha last year, my 618T has sometimes become unstable drifting a few kHz down or up. This is really irritating! The station can be ok for half an hour and then it becomes unstable and then normal again.

I have replaced almost all modules and I have also checked the alignment of the modules A12 and A4. However, this station is kept in a barn which is not heated so the station warms up through different temperatures. But of course it should be able to handle such differencies in temperature .

So my question is if anyone of you have a solution for this problem? This is not a military station though but there are similar versions used by the airforce as well.
Best regards
Tomas Rinman
SM0DRY
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