Before revision: Before cable-ready TV sets became common in the late 1980s, an electronic tuning device called a cable converter box was needed to receive the additional analog cable TV channels and transpose or convert the selected channel to analog radio frequency (RF) for viewing on a regular TV set on a single channel, usually VHF channel 3 or 4.
After revision: Before cable-ready TV sets became common in the late 1980s, an electronic tuning device called a cable converter box was needed to receive the additional analogue cable TV channels and transpose or convert the selected channel to analogue radio frequency (RF) for viewing on a regular TV set on a single channel, usually VHF channel 3 or 4.