Quote:
Originally Posted by LoTech
It drops off all at once from signal quality in the 90s to 0. What kind(s) of equipment/interference could cause this?
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Do you have a street light? How about a touch lamp?
To troubleshoot interference unplug everything in the house or turn off the branch circuits except for the TV set and the amplifier. If that fixes it, turn things on one at a time until the problem recurs.
If that doesn't work consider power line interference from outside the house. To trace it, tune your car radio to 530 on the AM dial and listen for a loud buzz. The buzz will be loudest close to the source of the problem.
Another potential source of a problem is the preamp itself. It could fail when it gets cooler, but that doesn't easily explain why the signals return later at night. If the preamp is oscillating, it could change frequency with temperature enough to explain the issue. The brand of preamp that tends to oscillate is an older Radio Shack design.
In one case I found that a neighbor's car had an FM transmitter interface for his satellite radio. TV reception was bothered only if the neighbor's car was home.