Originally posted by David McRoy
... overload from channel 5 or any lowband VHF channel into highband VHF channels, such as 8 and 9...the DTV allocations for WSVN and WPLG:
[antenna->splitter->combiner->tuner details removed]
... amplifier ... as the last element feeding my DTV tuner input:
David, Thanks so much for this detail. I was in the RS outlet last night asking what I could do about the overloading, but they were not up to the challenge.
I'll give this "low vhf filter" a try...wow, some hope.
You are putting the amp after the combiner, near the tuner??? Shouldn't the splitter/combiner/amp combo be as close to the antenna as possible? Or does putting the amp close to the tuner (more house shielding), give better isolation from the Channel 5 signal?
I don't know what 50' of "quad shielded" coax does to the signal to noise ratio, but it seems like putting the amp after the long run would normally be less desireable than putting it before the long run.
I don't need any kind of "dummy load" at the VHF-LO output? Where does the VHF-Lo band energy go? Does it set up a standing wave reflection back through the filter into the antenna? I guess it doesn't matter, if it works...
The other thing I thought about trying was building a few coax baluns, since one of the linked articles on antenna comparisons showed an improvement over a basic balun, but their hard to get station was in the UHF, not VHF-Hi, so perhaps this would not prove useful.
At least now I have something to try. I am getting a great picture for 22, 19, and 18 with occasional overload affecting 22 and 19. It seems like the overload is blocking reception of 8, and 9.
I can't wait till tonight to try this!