[BC] Daytime IBOC, Nighttime C-Quam (was: RE: IBOC - AM stereo)

[Kevin Tekel]

> Do I recall that NRSC-5 mentions only a mono service for AM? Or was my
> quick scan mistaken?

As I understand it, the NRSC-5 standard only applies to IBOC stations.
So if you're not using IBOC, then nothing has changed -- you're still
allowed to transmit full 10.2 kHz NRSC audio, in C-Quam AM Stereo or
Kahn POWER-side, if you so choose.

Meanwhile, you can't transmit hybrid AM IBOC and C-Quam AM Stereo
simultaneously because both systems make use of quadrature modulation,
but at night when the digital sidebands are off, IBOC stations are free
to transmit C-Quam AM Stereo.  Radio Disney affiliate 1110 KDIS in the
L.A. area is rumored to be setting up this kind of daytime-IBOC /
nighttime-AM Stereo scheme for their signal.  Numerous other stations
have the capability to transmit either AM IBOC or C-Quam AM Stereo at
the flip of a switch, but KDIS would be the first to use both systems
on a daily/nightly basis.



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