In article ,
John Miles wrote:

-Throw in SCA! Why not? PLL?

In a non-DSP solution, the choice of PLL-versus-quadrature techniques is
usually driven by the need for stereo decoding. You're more likely to
want a PLL to regenerate the 19 kHz pilot tone for stereo decoding.
This is not necessarily the same stage (chip) that does the FM
demodulation. Stereo MPX decoding is strictly a baseband process,
regardless of implementation.

SCA signals are the Muzak, ethnic radio, and library for the blind
signals hidden on narrowband FM subcarriers. 67, 75, and 92 kHz.
There's also digital stuff, pagers mostly.

Mark Zenier Washington State resident