Errr, what kind of radio?
Some RCI-made types (Galaxy/Ranger/Connex/Superstar/General) have a really w-i-d-e coverage range on the tuneable slugs used to set the PLL's channel frequency. One each for USB, LSB and a third one for AM/FM/CW.
If it's that kind of radio, those slugs alone can do this. Silliest thing I ever did with one of those was to set USB one channel higher than AM and LSB. Focused on those right-hand digits, and didn't pay attention to the ones on the left of the counter's display. Only had to do that once. So far. At least it was exactly one channel too high on USB.
IMHO, the wider the tuning range on those slugs, the more drift the radio's frequency will exhibit with temperature changes.
Most legal 40-channel radios do not have that kind of adjustment range on those slugs. And they tend to have a more stable channel frequency, too. Don't consider that a coincidence.
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