RF unit

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An RF unit, also known as an RF Modulator is a device used to connect modern video devices, such as DVD players and video game consoles to TVs that are either too old or too cheap to have standard RCA jack connections. It converts the audio & video signal to an RF signal that can be tuned by a TV tuner, usually on channel 3 or 4 with mono audio. RF modulators provide the overall poorest quality when compared to RCA Jacks, S Video or DVI connections.