Because your TV is an older one, it might not have, what they call RCA inputs (the 3 colored cable) Red-audio right, White-audio left, Yellow-video. If I understand you.
You do have the option of using the 75-ohm coaxial cable inputs. Signal comes in from outside to the 722k, Output of the 722k to the 75ohm coax input on the back of the TV. Tune your TV to ch. 3 or 4. Make sure the switch on the back of the 722k is set to the same.
If you really want to use the RCA colored cables, then you need to buy an RF modulator, which integrates older tv's to newer products. But usually dvd players, not necessarily cable boxes, but it would work if hooked up correctly.
You plug the RCA red, white and yellow from the 722k, into the rf modulator, choose channel 3 or 4 on the modulator
Connect 75ohm coax cable from rf modulator to TV 75ohm coax cable input. Choose channel 3 or 4 on the TV.
Hope this helps.
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