AVS Special Member
Join Date: May 2007
Location: Taylorsville, UT
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Overdrive means that there is too much signal, which, I don't think is an issue for you.
That there are issues (albeit slight) on all channels suggests there could be 1 or more of 3 things going on: Either the modulator is unhealthy, there is a problem with the cable going from the modulator to the splitter/combiner, or the splitter/combiner has a problem. One other thing I've seen that could cause what you're describing is the splitter/combiner connected improperly. Verify that the modulator and the antenna (CM-7777) are connected to the OUT legs and the IN leg goes to the 8-way splitter.
When I was using my Channel Plus 5245 for video, occasionally I would have to power-cycle it (unplug it and plug it back in), as the picture would go lousy. Power-cycling brought it back to good as new. Now, I use my modulators for audio only.