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I'd read before that UHF is better for transmission in cases where the signal might be blocked. I thought that might be the case in my metal building.
I'm going to do some experimenting soon and see if this works. If not then I'll likely just go to using some VHS channels for transmission and some for cable. I'm trying to see if I can find a good place to use this Terk MD-4. If I can't broadcast its combined input then I'll likely forego including UHF in my setup.
In regards to the channel spacing, I've been experimenting with that some today. I don't have a spectrum analyzer for calibrating my RF modulators and I don't know if I need one. I ended up turning AV all of the way down because I was still getting audio over modulation even with AV and audio all of the way down. Video I turned up until it went red and then backed off until the red was gone. Then with the RF level, I just set it to the minimum level that I could that wouldn't produce static.
Even with everything set the best that I can, I'm still getting some ghosting though from adjacent channels. It's not highly visible in programming but it is there. It's easier to see in test patterns or all black. I don't know if this is typical at this point. I'm also looking to try an active output combiner rather than the passive one I have currently to see if that helps the interference.
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