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.
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.
Connect the other end of the coaxial cable to a compatible signal source, such as the receiver box for cable or satellite TV.
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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.
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.
Plug the adapter and the TV into a surge protector power strip, which can then be connected to a wall outlet.