said by pflog:
Right I'm not so much worried about a 1dB swing as I am thus occurring g after an outrage and seeming to correlate with temperatures, since this area had a large temperature swing in the summer, sometimes as much as 50 degrees. Perhaps the AGC got screwed up when they did whatever maintenance they were working in. I'll just monitor it and see if any sync loss or other issues arrise, thanks.
If that were true you would most like see a corresponding change in signal levels forward and return rather than purely a "change" in SNR calculation.