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The cross-channel interference that I'm seeing is very minimal. It's something that is very difficult to notice unless you have a black background. I know the technology isn't perfect and I'm wondering if this is just something typical to expect. I never analyzed the signal so closely back when I was actually watching TV broadcast over RF.
In any case, they work a lot better with adjacent channels that the Pico Macom ones that I had, which I'm assuming were dual sideband. They didn't look bad when isolated but they would absolutely destroy any adjacent channels.
My take on these modulators so far is that they're nice but they seem to be likely to have problems. Of the four brand new ones I had, one was DOA with an E2 error message immediately after opening. Of the six used ones I just bought, one had a problem with flickering power that would also affect other modulators on the same power supply. And a while back I bought a big stack of used ones for cheap, hoping that a few would be good. There's probably 15 or so in that stack and every one was dead.
On the positive side, it's a vestigial sideband modulator and the HE-12 form factor allows me to use up to 12 in 2u rack space. Also, a lot of them are stereo, and it's not easy to find a good stereo modulator at a good price. The new ones that I bought did not include the stereo board, so I opened up a few DOA units and took the stereo boards from there.
Also, these things run super hot so I ordered the Blonder Tongue fan unit that's suggested to be used when more than 6 units are deployed.
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