DTV reception problem question

[akirby]

Sounds like it should work. Only one way to find out.

[kq6qv]

Does anyone have any thoughts about electrically disconnecting the UHF portion from the VU-190 at the terminals and then adding the 4228 with a balun to these terminals? That way I'll be running just one coax?

John- If the 4228 is connected in parallel to the VU190 it will interfere with the VU190 in unpredictable ways. The way to achieve one feedline is to use the CM7777. It has a built-in VHF-UHF combiner, and its VHF input will ignore any UHF signal from the VU190. -Ken

[akirby]

I thought he was talking about disconnecting the UHF portion of the VU190 and connecting the 4228 to the same balun where it would be combined with the VHF portion of the VU190. So the 4228 would just replace the UHF part of the VU190. Why wouldn't that work?

[kq6qv]

Akirby- Assuming the UHF part of the VU190 is removed, and assuming the 4228 does not radiate (is highly reactive) at VHF frequencies, the 4228

[whatchel1]

If you are going to get the 4228 then just remove the VU-190. The lowest frequency is 9 the 4228 will pick it up well enough with out the need of the VHF section. Also I recheck your location using the plus 4 on the end of the zip and everything is coming into your location w/ in a 15 degree arc. How high can you mount the antenna in the air? Are those metal greenhouse all around you? If so that could be a source of mutli-path that could be giving you problems?

[algopher]

If I got much higher with my mast I'll have to add guy wires and I'm following the KISS principle right now. There isn't any green houses near me. You must be looking at a satellite shot of the area; most of them are from around 2002. The only thing metal around here is a storage shed about 100-150 ft away from the house.
When is the shift to UHF suppose to happen? In 2009?
Thanks for all the input as all this good stuff is getting as long as my "honey do list". I'll keep you posted.

[whatchel1]

There is no shift to UHF. The analog cut off date is 2/17/09. there will be no channels above 52 in the TV band after that. Many of the broadcasters will start transmitting on their present analog channel in digital.

[algopher]

My intentions are to disconnect the UHF portion of the VU190 and replace it with the 4228 electrically.
If looking at the terrain from a satellite shot, my zip probably put you at the post office which does have green houses near it. I'm about a mile ENE of the post office.

Again, thanks for the input.


John

[akirby]

Based on what Ken said you'd need a VHF filter for the 4228 and a UHF filter for the vu190 before combining them to avoid interference.

Or you could just try the 4228 by itself.