How do I Convert a 75 OHM Cable to HDMI?

By Marshal M. Rosenthal

Wireless technologies are unable to maintain a stable and consistent connection at all times--which is why cables are still the preferred method for transmitting video from one location to another. To convert the video being transmitted over a 75 OHM cable to a HDMI video cable, use a video conversion box. The video conversion box, which is available from computer as well as electronics stores, provides the proper connectors for both the 75 OHM cable as well as the HDMI cable, besides modifying the signal so that it can exit the 75 OHM cable's connector and enter the HDMI cable's connector. The procedure is straightforward and does not rely on having any previous experience in working with either 75 OHM or HDMI cables.

Things You'll Need

  • Video conversion box
  • HDTV

Step 1

Place a video conversion box next to the high-definition TV, for example, the RF Coax To DVI HDMI Video Audio Demodulator or the HDMI over Coax Converter.

Step 2

Plug the power cord into an AC socket for power. Turn the video conversion box on if there is a power switch. Press the "Source" button to select the 75 OHM input. Press the "Destination" button to select the HDMI output.

Step 3

Unscrew the end of the 75 OHM cable that is connected to the coax connector on the HDTV. Screw the end into the coax input on the video conversion box.

Step 4

Insert an end of the HDMI cable into the HDMI output on the video conversion box. Insert the other end of the HDMI cable into the first or only HDMI inputs on the HDTV.

Step 5

Turn on the HDTV. Press the "Menu" button beneath the screen or on one of the edges. Use the "arrow" or "Up/Down" buttons to go to "Settings." Select "Settings." Select "Video input" beneath "Settings." Choose the first or only HDMI input from the list of choices presented beneath "Video input." Press the "Menu" button again.

Tips & Warnings

  • Some 75 OHM to HDMI conversion boxes require two boxes--one to connect to the cable and the other to connect to the HDMI cable, with a 75 OHM cable connecting the two boxes together.
  • The conversion of 75 OHM to HDMI will not result in a video signal as good as if the signal were totally digital throughout.