Radio Shack VU-90XR - Get VHF not UHF - AVS Forum
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post #1 of 16 Old 12-13-2006, 10:27 PM - Thread Starter
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I purchased and installed the RadioShack VU-90XR UHF/VHF/FM antenna today and apparently I am only receiving VHF channels. I assume this because looking at my zip, 70047, the only digital channels that I receive are VHF (PBS in New Orleans and WBRZ in Baton Rouge, LA -- depending if I face it west or east).

I have a basic connection for the antenna and I'm wondering if thats the cause (maybe I'm missing something for UHF). The 75-ohm to 300-ohm transformer that came with the antenna is connected to a screw on each side of the antenna. I have a coax that connects directly to the transformer and into the digital port on my Sanyo DP42746.

If anyone could help me figure out if my setup is correct and how to fix it, I would greatly appreciate it.
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post #2 of 16 Old 12-14-2006, 05:09 AM
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check to make sure tuner is set to off air and not cable.
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post #3 of 16 Old 12-14-2006, 06:03 AM
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"Caution: The crossover wires must not touch the antenna
boom, the mast, or each other. If necessary, carefully bend
the crossover wires to provide at least 1/2 inch of clearance
between parts."

This is a quote from the install manual for the antenna. I am not sure of the effect if they touch the antenna but apparently it is not good. Have you checked these wires to make sure they have the proper clearance?


Antennaweb shows that there are 8 UHF digital stations in your area.

Anthandle
McKinney, TX
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post #4 of 16 Old 12-14-2006, 07:50 AM - Thread Starter
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Thanks for the responses. I was in UHF/VHF on the TV and tried Cable just for fun...still just PBS facing east.

I'll try checking the crossover wires but I think they're OK. I find it strange that I am only getting VHF with this antenna.
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post #5 of 16 Old 12-14-2006, 11:51 AM
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Have you tried looking for analog UHF stations, too?
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post #6 of 16 Old 12-14-2006, 01:12 PM - Thread Starter
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When the antenna is plugged into the UHF/VHF/CATV coax port, it receives the analog stations (fuzzy unless aimed appropriately).
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post #7 of 16 Old 12-14-2006, 02:02 PM
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post #8 of 16 Old 12-15-2006, 08:23 AM - Thread Starter
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jtbell:

I do receive the UHF channels when I plug the antenna into the UHF/VHF/CATV port on my tv. However, still only receiving PBS (VHF) when in the digital port.
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post #9 of 16 Old 12-15-2006, 12:23 PM
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Hmm. Do you see "ghosting" on your analog UHF stations (secondary images offset from the primary one)? That's a sign of multipath interference caused by signals reflecting off something. Multipath can wreck a digital signal on most tuners much more easily than with an analog signal.

Is your antenna indoors or outside on the roof? Is it on a rotator? Aim can be more critical for digital than for analog, with distant stations. If you have a multipath situation, you may have to aim the antenna very carefully so as to put the reflected signal in a "null" of the antenna's reception pattern.
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post #10 of 16 Old 12-15-2006, 12:46 PM
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Quote:
Originally Posted by jtbell
Hmm. Do you see "ghosting" on your analog UHF stations (secondary images offset from the primary one)? That's a sign of multipath interference caused by signals reflecting off something. Multipath can wreck a digital signal on most tuners much more easily than with an analog signal.

Is your antenna indoors or outside on the roof? Is it on a rotator? Aim can be more critical for digital than for analog, with distant stations. If you have a multipath situation, you may have to aim the antenna very carefully so as to put the reflected signal in a "null" of the antenna's reception pattern.
describe what a "null" is i think i understand but go ahead anyhow.
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post #11 of 16 Old 12-15-2006, 03:36 PM
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A directional antenna has maximum sensitivity in the forward direction, but it also has some sensitivity in other directions, rising and falling as the signal source "moves" around the antenna. Secondary maxima are "lobes" and angles with zero or at least much reduced sensitivity are "nulls".

As an example, see the sensitivity pattern for the Channel Master 3018:

http://www.hdtvprimer.com/ANTENNAS/cm3018.html

All channels have nulls at 90 degrees on either side of the forward direction. Channel 60 also has nulls 30 degrees from the forward direction.

That site has lots of information about various other antennas, including the VHF pattern for your antenna.

http://www.hdtvprimer.com/ANTENNAS/comparing.html
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post #12 of 16 Old 12-16-2006, 06:47 AM
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I have the VU-90XR and I am able to pick up all VHF and UHF stations in my area. I am also about 25 miles away from all the stations. It is very directional so make sure that you're pointed the right way.

Also, make sure that you are setting your tuner to scan for the stations frequency assignment and not the channel number. My Vip211 had a hard time locking on to a few stations using the auto scan feature but when I selected add station and selected frequency assignment 52 it picked up 12.1 and freq assignment 21 picked up 16.1 and so on.

For your Zip 70047

Channel Freq Assignment
4.1 36
6.1 43
8.1 29
12.1 11
20.1 21
26.1 15
38.1 40
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post #13 of 16 Old 12-16-2006, 08:06 AM
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bdwill,

As Doug Russ points out (punn intended) make sure your are aiming what looks like the back of the antenna towards the transmitter towers. The VU-90 is a good antenna for the distance. I used one in the Corpus Christi area up in the attic at about the same distance and was able to pull in the stations. I did use an attic amp to help with the signal but if mounted outside it should be sufficient.

Miner
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post #14 of 16 Old 12-16-2006, 09:03 PM - Thread Starter
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Everyone, thanks for your help, I really appreciated it! Tonight I decided I would give it one more chance before returning everything and had success!

For some reason with my TV (Sanyo DP42746) the option for "Digital Cable Search" was misconceiving to me. This is the option that I kept trying and receiving just the single VHF channel. Tonight I said what the hell and I tried "All Channel Search" and quickly picked up 6 digital channels!!!!

Looking back now I recognize my mistake was doing the digital cable search since it does only search VHF.

All the locals look great and I'm looking forward to watching the Saints win the NFC South tomorrow!
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post #15 of 16 Old 12-17-2006, 11:59 PM
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You mean "back into it"? ;) :)
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post #16 of 16 Old 12-18-2006, 07:36 AM - Thread Starter
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Quote:
Originally Posted by Rammitinski
You mean "back into it"? ;) :)
Yeaahh...wasn't what I was expecting from them in that game. But still good to see them in HD! :)
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