DIYbanter - View Single Post - Wanted: Radio Shack Weatheradio tech manual

wrote:
Have you tried reprogramming the SAME codes in them, or maybe
programming them for an adjacent county served by your NWS
transmitter?

Yep. It doesn't trip on any of those tests or alerts.

I was under the impression that the SAME data is transmitted with a
standard-ish modulation scheme, like Bell 103 or something. It seems
like they'd use a standard chip for this that would run off a crystal
remainder clipped ...

I would tend to agree with that, except that this is an old design.
The
parts list does list a couple of trimpots, which presumably adjust one
or both frequencies of an AFSK data stream. Without the schematic,
it is difficult to know what's going on in there.