An RF modulator is a box that converts the video (and/or audio) output of a DVD player (or camcorder or video game) into a channel 3/4 signal that is compatible with a TV's cable or antenna input.
For a more comprehensive look at RF Modulators, check out my articles: The RF Modulator - DVD Connection and Set up and Use an RF Modulator with a DVD Player and a Television with Only Antenna/Cable TV Connections.
For additional terms and definitions, check out my Home Theater Glossary
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