Originally Posted by xnappo
Your numbers are definitely borderline and will cause intermittent problems. Does you cable company use SDV? I am curious because here SyFy looks fine with these numbers, but if you have SDV the frequencies change dynamically.
Is your house fairly old? I am guessing that your cabling may be RG59 given that you see such dramatic loss as the frequency goes higher. Either that or you have a long cable run.
Your splitter situation is already pretty reasonable. So as I see it you have a few choices:
1. Have the cable co come out and adjust your signal at the POE. Of course this can be a pain especially with and HTPC as they tend to blame everything except their own stuff.
2. If you have RG59 runs you can replace with RG6(easily), then do so.
3. Buy a *good* amp at put it at the POE. I recommend this one: http://www.amazon.com/Motorola-Signal-Booster-1-Port-Amplifier/dp/B003T2RY7I/ref=sr_1_9?ie=UTF8&qid=1345667762&sr=8-9&keywords=motorola+cable+amp
In your situation, since you don't have an unreasonable number of splits, I would go for (1) then (3). If you get lucky, you will get a good cable tech that will help you debug while watching the affect on the diag screens.
[EDIT] reread your original post regarding not wanting to deal with a truck roll - I do understand that
So , you can go with 2 or 3. But if you get the amp, your levels will definitely go up but you need to make sure that your SNR ALSO goes up - otherwise there may be another problem (nicked cable etc).
Thanks xnappo and everyone who's pitched in!
To answer your question -- no, we don't have SDV as far as I know. I think if we did, we'd need one of those TA's somewhere between the wall and the TV, but the cableco hasn't offered or required that.
Oh, and FWIW the house was built in 1996.
Here are some more recent signal numbers on the three problem channels:
820 /FNC /339000 /-8.4 /30.4 -- (some tiling or whatever, in straight lines across the screen)
829 /SyFy /171000 /-5.3 /35.4 -- good picture again
872 /Sci /333000 /-8.5 /30.8 -- but still a good picture!?
I'm wondering if I could try a "#4" option -- to switch around the coax cables coming out of the one splitter near the fuse box. I could move the line to the family room (where the problem is) from the 3.5dB-boost outlet to one of the 7dB outlets. I could take it from the basement STB, which isn't HD.
Assuming you guys think this is OK to try, and if it doesn't work, then I'll try #2 as far as I can (from the wall to the Ceton -- no experience running coax around the house!) and then #3. #1 comes last.
In the meantime, I'll check out the various amps suggested.
Thanks again!Edited by JorgeA - 8/23/12 at 9:47am