An RF modulator is an electronic device used to convert audio and video signals from a device such as a DVD player or video game console into a format that can be transmitted over a cable or antenna. It does this by combining the audio and video signals into a single radio frequency (RF) signal, which can be broadcast over a cable or antenna to a TV.
RF modulators were frequently used in older TV sets that did not have composite video or HDMI inputs. The modulator was connected to the device with the audio and video cables and the modulator output was then connected to the TV's antenna input.
Some RF modulators also include a channel selector switch that can be used to select the frequency on which the modulated signal is transmitted. This can be important in areas where there are competing RF signals that can cause interference.
RF modulators are still used today in some applications, such as in closed-circuit television systems and in some home theater setups. However, many newer TVs and devices now include composite or HDMI inputs, which make RF modulators less necessary for most consumers.
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