How to Convert Coaxial Cable to HDMI

By James Clark

Coaxial cable carries audio and video signals from a television programming source to a TV. Modern television sets, especially high definition TVs, are equipped with different jacks for connecting to a source. The most common digital connection is a High Definition Media Interface (HDMI) cable that uses a six-sided plug. Converting coaxial cable to HDMI requires a powered adapter similar to an old RF modulator for converting coaxial signals. Available at electronics stores, the adapter attaches to both cables in minutes.

Things You'll Need

  • Coaxial cable
  • Coax to HDMI adapter
  • HDMI cable

Step 1

Connect the coaxial cable to the signal adapter box by attaching the cable coupler to the threaded jack on the box and turning clockwise by hand.

Step 2

Connect the other end of the coaxial cable to a compatible signal source, such as the receiver box for cable or satellite TV.

Step 3

Plug an HDMI cable into the adapter box with the wider end of the cable turned upward. An HDMI plug inserts in one direction only.

Step 4

Connect the other end of the HDMI cable to a port on the back of a TV, monitor or other video device, again with the wider end of the plug turned upward. If the TV or monitor has more than one HDMI Input, make a note of which one is used with the coaxial cable connection.

Step 5

Plug the adapter and the TV into a surge protector power strip, which can then be connected to a wall outlet.

Tips & Warnings

  • Press the "Input" button on the TV remote repeatedly until the signal from the coaxial cable appears on screen.
  • Do not connect the adapter or the TV to the electricity until the cable connections are complete.