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I do not know about modulators but two channels next to each other on the dial, one very strong/one very weak can definitely cause issues on older TV sets. When I was young, we had two channels next to each other. One, channel 9 was 80 miles away and weak. The other, channel 10, was 30 miles away and very strong. There was interference from 10 onto 9 all the time on our TV and other TVs of the day (1960/1970s).
My mother still lives an the same area, but now has Dish Network and a modern TV, so no problems. Plus ,the strong channel has re-directed their signal away from her area, so channel 10 is much weaker now.
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