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Join Date: Jan 2000
Location: Salt Lake City, UT, USA
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You could also look at an analog channel (usually a low-power TV station) that is near the same channels as you have problems with (2-6 are low-band, 7-13 are high band, and 14 and up are UHF, so something in the near range of channels). See if there is a lot of interference in the analog...beats, strong lines, etc.
Often, a computer or other digital device can interfere with indoor reception. Switch-mode power supplies, like in battery chargers and in many digital devices can cause interference. DVR's and some set-top boxes (like for Cable TV and satellite) can often cause noise, too.
You may have just enough signal most times, but the change of season and the time of day can cause a tiny change, enough to drop out the signal. That's called "low margin".
Daily and seasonal variations are normal, and a bit of extra "margin" is all it takes to make up for them.
Ken English, Sr. Engineer, KSL-TV.
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