It sounds like the 40m band xtal has aged and is subsequently off
frequency; it's not at all uncommon. You can either try to modify the
oscillator to make it "warpable" or buy a new crystal.
Al, K2ZN
w0oow@piperscreek.com wrote:
>
> My old Century 21 has been through the alignment process, but even though
> dead on for 20 meters, still shows about 12-15 khz off on 40 meters.
> Thoughts?
> Thanks,
> Steve
>
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