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Further digging thru the TV menus revealed a diagnostics screen with signal strength and signal noise ratio dB figures.
Update...
Our old VCR which I just discovered didn't work anymore, was in the signal chain as was the TWC DVR. I didn't realize the DVR was in the loop until I started tracing wiring to remove the old VCR. Removing these two devices along with the A/B switch (no longer necessary) gave me a SNR increase of 5 dB in all channels. It also allowed reception of two more channels. One of them is a CW affiliate 65 miles away coming in with a SNR of 18 dB. The other is a low powered 24/7 religious channel that drops out occasionally. Per the signal measurements on my TV, anything less than 15dB is going to have problems. In hind sight I should have tried the most direct route to the TV first instead of placing the A/B switch ahead of everything. Duh!
Last edited by phone man; 22-Aug-2011 at 9:52 PM.
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