Some things to try:
1) without the preamp ...yes thats a pain for you, but you don't need it, and worse, it causes problems!
2) Of course, multi-path is a common problem which makes antenna pointing a challenge - I have to assume you have tried many different antenna orientations - but without the preamp, another spin and view must be done
3) Some RF plumbing...I had a very similar sounding situation which was only solved by building a VHF-Lo filter. It's all RadioShack stuff, (not that I'm going to tell you if it doesn't work you can take it back....), and it did a miracle for me in Boynton. HiDefDave (David McRoy) is the designer of the filter. I'm going to copy in the info here:
]...and anyone else who is getting 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:
Here is a link to a view of the band splitter that Sandy Sanchez and I have been using to solve this problem:http://www.radioshack.com/product.as...5Fid=15%2D1236
It's the Radio Shack Cat.# 15-1236.
Feed the antenna to the "OUT" (remember, this device is bi-directional) and feed the Hi VHF and the UHF outputs (which are labeled "IN") into a two-way combiner. Here's a splitter/combiner that's also bi-directional:http://www.radioshack.com/product.as...Fid=930%2D0061
The RS Cat.# is 930-0061. The moddel number is 2512-25.
For this particular application you would feed the High VHF and the UHF "outputs" from the band splitter into the "OUT"s on the combiner/splitter. Then connect a short coax cable from the "IN" on the combiner/splitter to the antenna input of your DTV tuner.
What this does is to attenuate everything below channel 7.
To hook all this up, you can use a combination of some F-connector adapters like this:http://www.radioshack.com/product.as...5Fid=278%2D275
RS Cat# is 278-275.
...and a short coax cable to feed your digital tuner. (I use this: http://www.radioshack.com/product.as...5Fid=15%2D1541
What you'll have when you're finished will look weird but it should work to keep channel 5 from overloading your DTV tuner.
In addition to all that, I have this amplifier in the signal path as the last element feeding my DTV tuner input:http://www.radioshack.com/product.as...5Fid=15%2D1113
This is RS Cat# 15-1113. (Mine actually says "15-1113C".)
If you live really close to the transmitters you may find that the amp does more harm than good. And it will definitely intoduce interference in your analog NTSC pictures, so this is strictly a trial-and-error option.
Pan 34" 16:9 HDTV
Registered: Oct 2001
Location: Boynton Beach, FL
David - Come get your Champagne
Fellow WPB threaders,
SUCCESS!! It's been a roller coaster 11 days since Robert (ZerO) listed his equipment and success in Boynton Beach, but tonight the RS VU90XR
antenna is in the attic, and the HDTV tunes all five digital channels (+1 subchannel) - including all OTA South Florida High Def.
My excitement and frustration went up and down more often than Channel 18's HD station, but tonight I celebrated the successful finish of this quest.
It was David McRoy's astute remote problem analysis and precise description of the solution that has me dancing in front of the TV.
David posted a step by step guide and parts list for building a VHF-Lo band filter from RadioShack parts to eliminate interference from the analog TV
stations just five and six miles away, and when I installed the filter - channels 8 and 9 snapped into view.
For anyone contemplating building the filter, the combiner/splitter RS Cat.# 930-0061 David listed may be an online order number only, but the store has a 15-1237 ($9.99) which exactly fits the spacing of the VHF-Hi and UHF ouputs of the three band splitter, and the 75-Ohm Coax "F"-Type Terminator needed is Cat. # 15-1144.
I don't need an amp to get all the channels, but I tested with it after the filter to see the effects.
My SIR-T150 "reception meter" readings are:
Channel .Station ...Net w/filter w/filter+30db amp
29->39.1 WBZL-DT .WB.....1.........6
9->10.1 .WPLG-DT .ABC....3.........6
22->4.1 .WFOR-DT .CBS....3.........7
18->2.x .WPBT-DT .PBS....2.........7
8->7.1 ...WSVN-DT .FOX....3.........7
There's more stations now... (8/19/02)
Last edited by pogo on 03-01-02 at 12:03 AM