Things You'll Need
Instructions
Purchase a phono to F coaxial adapter from an electronics supply store. Make sure the adapter has a male F connection and a female RCA (or phono) connection.
Screw the male end of the cable into the coaxial port on the back of your TV. You may see two ports, above which will be the words "cable" or "antenna." Either of these ports will work.
Remove the UHF/VHF slider from your 2600 system, if it came with one. You are making a direct connection to your TV's coaxial port, so this slider is no longer necessary.
Insert the RCA cable that previously plugged into the slider box into the female end of the adapter sticking out of your TV. Plug in the Atari's power supply to an electrical outlet near the TV.
Insert a cartridge and set your TV to channel 3. Turn on the game switch on your 2600 console. If you don't see an image, try channel 4. When you have an image, you're ready to play.