|
Nobody has mentioned whether they are using modulators with vestigial sideband. Commonly available low-cost modulators will be double sideband. Hence you can't use adjacent channels. The signals will overlap and interfere.
Also beware of using channels that are being used to broadcast digital TV locally. You don't want to interfere with other people's reception, and don't let an unfiltered double sideband signal spill on to a locally used channel.
There a risk of them interfering with your system, even if you use fully wired distribution. At the Vintage Wireless Museum in Dulwich, South London, there were problems with digital TV from the nearby Crystal Palace transmitter getting into the wired system. The effect was subtle - noisy pictures. To an analogue TV a digital TV signal looks like white noise. That's true for the DVB-T system used in much of the world. I think it's also true for 8-VSB as used in the USA.
|