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Originally Posted by Matth
This is bypass channels on the cable, for the "ordinary", is it?
Nothing altered on the analog STB?
Any other devices with RF out inline, and on when they were not before - I'm thinking co-channel / image channel interference (image channel is usually 10 channels away, but it can vary with TV design). Lines and patterning are usually some form of channel conflict, but interference can result from excess signal level - any extra amplifiers and splitters?
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Yeah, it's the bypass channels 1-5, not viewed using the STB tuner. I've got a 6 output amplifier connected, I just tried connecting a portable directly to the output of the STB and the picture is totally line free so it looks like my amplifier is causing the interference. Any recommendations for a good quality amp that will last longer than the one I've got, only had mine 5 yrs, it is in the attic though - perhaps temperature extremes shorten their life.
Only thing I don't understand is why it suddenly became worse after the cable modem fault was fixed. I'm sure all the engineer did was change the splitter in the box outside.
Cheers