|
One of the confusing things is your use of the word Coax. RF cables are coax with F type connectors, audio and composite video cables are coax cables with RCA connectors (though BNC and PL-259 connectors are used in some applications).
It is more helpful to refer to the signal (composite video, RF, etc) in the cable then if necessary explain the type of cable.
If you can post a picture of the connectors on your TV and your system it should clarify.
In the early 70's back 300 ohm twin lead was the standard RF connection for antennas, but by the late 80s 75 ohm F-type coax was the standard antenna RF connector. TVs made in the transition years often had both types of RF connection. Some sets made it so that both connections would work at the same time, but other sets had some method (there were many so a picture would be needed to figure it out) of switching which one was connected to the tuner.
If your set only has 300 ohm twin lead RF input you want to connect your coax RF source to a Balun to adapt it to 300 ohm. Some baluns are bidirectional (you can use them to convert a 300 ohm antenna to a 75 ohm TV input or a 75 ohm antenna to a 300 ohm TV input), but some will only work one direction. If you have a single directional Balun converting impedance backwards it can outright fail to work.
|