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Whew! Busy couple of hours.
1. The Balun made no difference.
2. Pulled off the 3 way splitter and went direct to AverMedia tuner card on PC - very good signals, got three missing channels back.
3. Noted the old splitter had 2 (7.9?) hi db outs and 1 low db (3.8?) out.
4. Replaced the splitter with a new one, at 1m khz and hi db outs. Channels returned to all three tuners.
5. Splits 2 and 3 running an average of 35-40% signals on existing coax. Split 1 (Avermedia) running at 4 green bars - but all three tuners see signal drift - up and down.
6. The old splitter was dripping rain water from the inside. No doubt the splitter had moisture causing some of the problem. Replacing it returned the signals.
7. Had a second coax (from dual head sat dish) and substituted this as final test. A little lower averages for splits 2 and 3 - about 32-38% signal strength, but some less signal strength drift. Split 1 has same 4 green bars (of 5) no matter the coax used.
Specifically 2.1 (UHF 44) is drifting with a day time signal strength drift between 33-38%. channel 2.2 (UHF 45?) is drifting with a day time signal strength between 35-38%. Channel 6.1 (UHF 40) is drifting between 38-42% day time signal strength. Not great, but: replacing the splitter gave me channels back on all three tuners and, at present, I am not getting a lot of digital breakup on any of the tuners.
But, I do fear that the night signals will worsen and I'll have problems getting 2.1 and 2.2 or even a quality signal on 6.1, come 9-10 PM.
One other thing worth noting: while the 3-way splitter was outside the weatherproof box, channels 32.1, 32.2 and 33.3 suddenly started having very bad signals. As soon as the splitter was installed back into the plastic outdoor weather box those channels came back in strong. (Weird, as it's plastic, not metal.) I mention this because I think this is continued evidence that I am getting external signal interference that can wreak havoc on certain channels. I now have to wonder if 2.1, 2.2 and 6.1 are getting some kind of interfering signal that causes the signal to stay suppressed in the 40% strength range and drift 2-5%.
In fairness, replaced coax and balun did not improve my signal problem (they remain installed anyway), though the coax replacement may have reduced some signal percentage drift. Replacing the splitter got the weak signaled channels back.
I remain interested in any other suggestions. Thanks to all who have helped thus far.
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