AVS Forum Special Member
Join Date: Jan 2000
Location: Salt Lake City, UT, USA
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Try listening to an AM Radio for a bit. See if you hear any "pops" or "statick-y" noises, when tuned to a spot where there are no stations (highest or lowest frequency on the band is often a good spot to listen).
With a weak signal, or VHF signals, intermittent noises...like from a thermostat cycling on and off, from a computer or modem, light dimmers, etc, can cause sudden dropouts. I've noticed with my fancy radio, that switching transients from the washing machine, heat thermostat, even static discharges from touching the radio or it's speakers, will cause the AGC to react violently, dropping the signal to zero for a split second. I suspect that some Digital Boxes may have a fast enough AGC (Automatic RF Gain Control) that they may get hammered by static pops, or the signal is just overridden momentarily by the static.
With the radio, I just have to set it for a slower AGC Attack time. But, to really "fix" the problem, I'll probably have to clean some electrical contacts, or use an outdoor radio antenna.
Ken English, Sr. Engineer, KSL-TV.
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