You're correct that the audo tapes would only have audio information, but
the SCA information is also in the baseband signal except that it's outside
the audio bandwidth that the tape recorder would have recorded due to AF
filtering in an ordinary FM receiver. As I understand it, the SCA
information is filtered from the demodulated signal before it is sent
through the AF filter normally used for the audio output of the "main"
(primary carrier) baseband signal.


"Bob Horvath" wrote in message
...
On Fri, 11 Feb 2005 03:01:21 -0500, Bob Horvath wrote:

Your tapes would only have "audio" information on them, not Radio
Frequencies, which is what contains the SA information.