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Which UVSJ one would you recommend ADTech?
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Given the limited availability since so many ones from the past are NLA, ours is the only one currently on the market that I have current performance data on. I tested a number of them 5-6 years ago but haven't revisited them since most of them have been discontinued.
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Thank You for so eloquently describing what I have experienced in
the field so many, many times.... In theory, a good UVSJ should
work under all conditions but in practice, that is not so. That is why
I always recommend keeping separate coax runs and using an A/B
switch.....
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Remember to old TV commercial that said "If it doesn't say Sunkist, you don't know what you're getting""? (
https://www.youtube.com/watch?v=5jP09HFiRD0) When importers like MCM bring is stuff from China without any performance data provided, there's no telling what you're buying.
:shrug:
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Strangely, when both feeds to the UVSJ are populated, the UVSJ does not allow Real-25 to pass through to the output.
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Sounds more like there's simply excessive insertion loss in the UHF high pass filter and the signal was simply lost due to an inefficient device.
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Is this some form of destructive interference where some very low amplitude CH-25 signal passes through the VHF-pass filter and destructively interferes with the CH-25 coming through the UHF-pass section?
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Unlikely, see previous.
I don't recall, but are you using a preamp with this arrangement. Have you tried amplifying only the UHF signals? IIRC, your combiner has a switch that allows pass-through on the UHF-only port and, if implemented, that would overcome insertion loss of the combiner's UHF port.