Thanks for the background info and the signal readings. What I want to know is how long have been using OTA for digital TV? To put it another way, have you been able to receive digital OTA without these problems, and they just now started, or have you had these problems ever since you started with digital OTA?
I wanted to see what the real channels were, because those are the frequencies for the transmitted signals. Channel 13 is VHF-High, and more likely to be affected by noise, but it didn't seem to change.
2-1 KPRC NBC, real channel 35
13-1 KTRK ABC, real channel 13
20-1 KTXH MyN, real channel 19
26-1 KRIV Fox, real channel 26
39-1 KIAH CW, real channel 38
http://www.rabbitears.info/search.ph...pe=dBm&height=
There shouldn't be any difference between the sub channels like 13-1 and 13-3, because they are both part of the same transmitted signal, but there is. Maybe the intermittent problem.
Big difference in 39-1, before and after, but you changed two things at once. Looks like overload to me.
2-1 very strong after, but way too many uncorrected errors for viewing.
The CM 3044 is an old distribution amp that has a gain of 22 dB, but each of the 4 outputs is only up 8 dB which doesn't compute in today's terms. Must be a high loss split as compared to the CM 3414.
The 3044 specs say max output is 23 dBmV, which is equal to -26 dBm using a conversion factor of 49. That would mean a max input of -34 dBm, if my math is correct. Your strongest signal is -35.1 dBm before adding the antenna gain, so it could be overload.
My impression is that the CM3414 is much less likely to overload than the 3044, but why would you need a distribution amp instead of a passive 4-wqy splitter with signals that strong, unless the trees are attenuating the signals.