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Old 12-12-2016, 01:58 PM
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DavGoodlin DavGoodlin is offline
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Join Date: Aug 2011
Location: near Strasburg PA
Posts: 3,400
Quote:
Originally Posted by Robert Grant View Post

The problem is more common in antenna systems that have a preamplifer at the antenna - the 4G itself is not directly causing the interference, but the preamplifer is overloaded by the 4G, causing the gain of the preamplifier to fall - even below unity, in some cases.
Very good point. Confirming the presence of LTE would help! I have a spectrum analyzer dongle planned for my laptop so I can actually "see " what is coming down the coax.

I'm in a semi-rural area with a commercial strip 1 mile north, which has cell installations all along it. In order to get a good variety of channels, I need to use a pre-amp. We only lost 1-2 UHF stations over the last 7 years, so I was not sure if LTE was to blame though Ive seen towers multiplying in the area.
The reason I started this thread was two reasons, one is what I've seen online about Europe. And thanks for clarifying how pro-active they are

The second reason was that my next door neighbor was having increasing issues with using this broadband VHF-UHF antenna http://www.solidsignal.com/pview.asp?p=CCS1233 in his attic for just the local channels to the NW.

A 10dB silver box amp made matters worse, so we moved the antenna outside and aimed it 88 degrees East like mine for the Philadelphia transmitters. Without an amp, and using 50 feet of coax to the unsophisticated "Upstar" LCD set locked in 49 channels. It started raining today, so Ill expect a report of drop-outs, etc.

I then tried out the Televes amp using two additional UHF antennas aimed NE and NW and found actual loss of some and gain of other UHF channels*. Back to no amp for the neighbor. Although there are individual gain adjustments for the 2 UHF and one VHF-hi inputs, I did not have time to try dialing them back at his place. Again, it would help to have a spectrum analyzer

* The spec sheet indicated that the VHF (band 3) input does not pass low band VHF or UHF so forget using it with a broadband antenna. I was expecting UHF stations from both inputs to be added, but only the stronger UHF passed and the weaker UHF from the Anntennas Direct X91 aimed at Wilkes Barre on the second UHF input was not added.

Next step is to try it on my attic array consisting of a 5 or 10-element VHF - HB yagi (Band III in Europe) and two UHF yagis (Band IV and V in Europe) and band V ranges from 568 to 790 MHz, ending at physical channel 67, which is unnecessary as UHF-DT in the USA ends at 700 mHz.
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