Originally Posted by Tower Guy
In order to be effective, the HLSJ must be installed between the antenna and the preamp.
Yup, that's how it's installed.
Your experience with the AP-8700 doesn't make sense. The fixed FM filter is in the circuit all the time. The switch simply adds the variable filter. Yes, the variable filter is designed to eliminate a single frequency, and that's what you really need. When you say that stations get noisy with the FM trap in, do you mean FM stations or TV stations?
I don't think you're correct about the filter being in the circuit all the time. Their instructions are clear that if you want to receive FM you should switch to "FM TRAP OUT" (which is factory set to outside the FM range).
Having the FM trap set to "IN" clearly attenuated FM reception across the FM range--the radio stations got fuzzier. If I had a station tuned with a little fuzz and then switched the trap to "OUT" it cleared up. Winegard's instructions confirm my experience: the preamp is designed to allow FM to pass if you so choose.
Your finding that the 91XG is not that directional makes little sense. It could mean that you have so much multipath that you can't find the right aiming,
Here's the TVfool map for WMAR 2: http://db.tt/GOL5fgA
How I'm getting a solid signal is quite beyond me.
Here's WTXF's: http://db.tt/Qj541im
The aiming question is a good one. Iron Hill, a highly ferrous little hill that others have speculated is causing me problems, actually sits about 4.5mi south of me, between me and Baltimore. Perhaps it is responsible for making WMAR come in. If so, it might also have the same effect on the co-channel shared with WTXF. I don't think it is causing problems with WTXF directly, since it is to the back of the antenna when pointed to Philly, but who knows.
or it may mean that there is an electrical problem in the balun, F connector, or the coax.
I had the same experience with the 4228. I replaced the balun with no change. Having the same experience with a brand-new 91XG (which I have to suppose has a proper balun, too), seems to eliminate that as a potential source of the problem.
I also swapped all of my coax lines with others, to no effect. Now, I could try that again--I've got tons of the stuff--but since I can get so many other stations, I'm not sure that's it. If I get some spare time this afternoon I can try again.
I've also tried simplifying the connection to the PC: bypassing the splitter there and connecting directly to a card. That didn't change the reception of WTXF.