How do you hook up a RF modulator and dvr?

To hook up an RF modulator to a DVR, start by connecting the DVR's audio and video output (usually composite or RCA cables) to the input of the RF modulator. Next, connect the RF modulator's coaxial output to your TV's coaxial input. Finally, set the TV to the appropriate channel (usually 3 or 4) that the RF modulator is configured to transmit on, and you should be able to see the DVR's output on the TV. Make sure all devices are powered on and properly configured for best results.