The garage door openers I have serviced have a way to change which "channel"
they operate on, in case the default setting duplicates a door opener on the
same street or block. There is usually a dip switch, for example, to change
among various codes for channels. Not maybe that is technically a modulated
code, and not changing the oscillator frequency, but I think I saw one that
swaps caps, and that would be changing the carrier oscillator.
-Stuart
K5KVH
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