Hey OM:

The ole TV systems that used NTSC type signals, the video is Vestigial
Sideband.
So if what you say is TRUE then I never ever would have seen anything
on an NTSC tv but the low frequencies that are present in NTSC signal
part of the lower sideband.
All the now defunked, latest NTSC tv's used synchro' detection on the
Vistigial Sidband video.

I made a living repairing those old NTSC tv's that had synchro'
detection of the Vestigial Sideband video.

73 OM
de n8zu





On Jul 19, 4:00 am, Rob wrote:
But with a single mixer and synchronous detection,
this is not possible.