WM, you have a good question about losing signal. I got a pre-amp/amp combination for my system (
Channel Master 7777), although I haven't hooked it up because my antenna is still mounted inside.
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So, I can't say how well it works, but I had read good things.
Have you talked to DirecTV, yet? Not trying to push you...just asking.
We're talking about diplexers, TLS, not splitters.
Sorry for the late response, but I have just driven back to Benedict from Eagan.
Diplexers and triplexers are just passive frequency selective splitters. They have tuned resonant circuits to direct different frequencies to different ports. They use transformers just like a splitter. A transformer will not pass DC.
The gear on the roof is phantom powered. You can not put a transformer in any phantom circuit, just like you can't use a microphone transformer in a microphone circuit phantom powered from the mix desk.
You would have to have a device that blocks the DC, impedance matches the the signal in the split, and then recombines the signal and the DC.
Also pulses are sent up the wires to change satellites, and these would have to be allowed for as well.
The other issue is that I doubt the overland digital signals and satellite signals are the same. He would have to run a wire to the antenna input anyway. So I don't see a way around having to run separate cables form Antenna to DVR and receiver. May be direct TV have a device than can be placed at grounding block, that can combine the signals, but I have not heard of it. The Direct TV system is very non resilient. Even barrel connectors cause some loss of signal strength, so they keep them to the minimum. Every receiver has to have its own line to the multiswitch and every DVR needs two. Their DVR and roof equipment blow up with power line fluctuations, and with voltage sags especially. I found out that UPS systems are mandatory, at least where I live.
The new system that gets more HD channels and local channels in HD, is very touchy. However since replacing all electronics on the roof twice and changing out the HDDVR that did not have a UPS twice, and putting a UPS on that device at the last change out, it has been smooth sailing.
My first Direct HD system was unsatisfactory, because the signal detectors kept filling up with water, as there were no seals on them!
Due to all the problems I had, and the fact that Direct TV techs seem to come with minimal equipment, I got familiar with their systems, from a technical standpoint. I had to get much more involved than I would have liked.