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Also, it’s worth noting that CAP is supposed to be backwards compatible with EAS as far as the protocol EAS uses (SAME – Specific Area Message Encoding). In theory this may mean existing weather radios that support SAME decoding should also support CAP.
The EAS SAME protocol is documented quite well: http://en.wikipedia.org/wiki/Specific_Area_Message_Encoding
Someone now has a website that will encode and decode EAS/SAME messages to/from audio:
Looks like someone has already made a SAME encoder based on an ATTiny45:
I used to know of a kit for decoding SAME messages for use on Ham radio repeaters, but I can’t seem to find it. I’m sure it’s out there still.