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I added a TV to my gym and didn't want to get another cable box so I got a Chromecast and connected the antenna to it expecting it would work fine since the other TVs in the house haven't had a problem with it. I'm surprised that the brand new Samsung TV can't handle the signal as well as other, older TVs.
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Oh, I thought you were connecting the antenna directly to the TV.
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The Terk is pointed NW because the reason I got the antenna was to get WPMT and watch Eagles games. So, the antenna is serving its purpose.
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WPMT is one of your weaker channels, with co-channel interference, adjacent channel interference, and a 2Edge signal path; not a reliable channel. No broadcast of the games on one of your stronger channels?
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Is the signal strength fluctuation shown by the TV a symptom of an overloaded amp or tuner?
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That is certainly a possibility. The strong signals mix together and create extra spurious signals within the preamp itself that damage the weaker signals like WPMT. This is called IMD, for Intermodulation Distortion.
Inserting an attenuator is the traditional way to deal with IMD, but you can't insert an attenuator between the antenna itself and the amp, because the amp is internal. You could insert an attenuator between the power injector and the TV to test for tuner overload. If you remove the power to the injector, then the dead amp would act like an internal attenuator of unknown value.
http://www.terk.com/docs/common/HDTVA/HDTVA_OM.pdf