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Old 30-Nov-2014, 10:33 PM   #6
ADTech
Antennas Direct Tech Supp
 
Join Date: Jan 2010
Posts: 2,942
A number of the El Paso stations are unfortunately (for you) located on the southern tip of the mountain range outside El Paso and the signal path to your location is blocked by a number of the closer mountain peaks, notably the one on with KFOX is located, due to those stations being at slightly lower elevation plus the combination of directional antennas aimed away from you. This causes the signals from the NBC and CBS stations to be severely attenuated in relation to the Fox station although they are less than a mile away.

I recently went through this with a customer in your immediate area just this summer and with a very substantial investment in time and money, he was able to improve his reception of those stations, but it was never as perfect as he wanted.

That project involved a DB8e (better lower UHF response, a custom 40 dB notch filter for your nearby PBS station, and a preamp that could still tolerate both weak and very strong signals). He invested probably $400 trying to overcome the limitations of his location without achieving his goal.

The El Paso stations utilize UHF channels 15, 16, 17, & 18 which are sequential and each has at least one adjacent channel. This is normally not a problem when transmitter sites are located close to each other and the coverage area receives all stations equally well. Unfortunately, you have a 40 dB attenuator in your signal path that causes three out of four of those stations to be attenuated leaving channel 15 extremely strong while 16, 17, & 18 will be extremely weak. The simulation software flags the adjacent channel condition for channel 16 since it will be most affected by the extremely strong adjacent channel 15 signal.
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Last edited by ADTech; 30-Nov-2014 at 10:46 PM.
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