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Old 12-07-2016, 10:36 AM
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DavGoodlin DavGoodlin is offline
Motorola Minion
 
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 2,862
LTE - ATSC interference

The 4G cell transmissions are often within the upper UHF-TV band (above channel 51) and seem to be causing DTV dropouts on ATSC tuners without adequate image rejection and adequate band pass filters. there is a white paper here https://apps.fcc.gov/edocs_public/at...A-14-852A2.pdf

Most antennas and amps are designed to pass the old UHF band, up to channel 83 at 890 mHz. Channel Master and others are selling an inline low-pass filter that supposedly reduces this problem.

A new line of outdoor preamps from Solid Signal has this filter built-in. I have ordered one that takes up to 3 inputs, for antennas aimed in different directions. It seems the older mast-mount preamp designs from CM and Winegard's AP-8800 have all been discontinued.
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Last edited by DavGoodlin; 12-07-2016 at 03:15 PM. Reason: CM 7777 still available
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