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Probably not. Better picture results are achieved with either S-Video, standard RCA AV cable (yellow-white-red), or YUV component cable (red-green-blue) (component output does not have audio - this requires extra cable to be connected). The video via either one of these 'AV' connections is stunning (based on a standard 16:9 LCD TV using a Panasonic DVD recorder).
RF tends to be lower quality - as opposed to AV/digital input. AV input/YUV component handles digital better. No one connects their DVD devices to their TV via RF (either directly to the antenna socket or with a modulator/attenuator) anyway. Because a VCR is mostly analogue, it will work fine with an RF connection, but DVD is digital, and so won't work as well, if at all.
RF also goes through the tuner in a TV, creating cross-interference, whereas AV is a direct input and is separate to the tuner.
I would say an RF modulator would not be designed to handle the output frequency that your DVD device generates. Throw the modulator out, or perhaps get another TV, or use RCA cables instead if the TV has AV inputs. Whichever is cheaper and easier, but don't use RF accessories except a standard antenna if/as required.
Leave the cable box powered on but disconnected from the TV or VCR. All other components should be disconnected and unplugged, giving clear and easy access to all connections. If components sit in an entertainment unit, make sure all A/V cables can reach the RF modulator and the cable from the modulator can easily reach the television.
Hookup the first coaxial cable from cable box output, usually labeled "TV," "TV out" or "Out to TV" to the cable "In" on the VCR. Connect the second coaxial cable from the VCR's out to "TV" to the coaxial input on the RF Modulator.
Connect the third coax cable from the coaxial cable "Out" jack on the RF Modulator to the coax cable "Input" on the television.
Take one A/V cable, connect the red (right audio channel,) white (left audio channel) and yellow (video) from DVD player's "Output," to the corresponding DVD "inputs" on the RF Modulator. Place components as desired but still disconnected from power. Plug in all power cables including the RF Modulator's into the surge protected outlet strip.
Make sure the Channel select switch usually found on the back of the VCR and the Channel select switch on the RF Modulator are both set to Channel 3. This channel is used on the television to view your components.
Turn on the power strip and turn on the TV. Cable reception should come on as usual. Set the TV to Channel 3 and turn on the VCR. With VCR on test it by playing a video tape. The RF Modulator should sense the signal and automatically switch to "VCR."
Switch off the VCR and with the television still on channel 3, turn on the DVD player. As the RF Modulator senses the DVD player signal and switches to DVD, its welcome screen should be seen on the television. Play a DVD to test and once you're done with the DVD turn it off and the cable should come back on.
@ tihis link above you can see it. It takes the av SIgnal Your Sound and picture and convert it RF making it possible for your tv to tune it, its just like tunning into a station. I do sell these for R199 South African Rand excluding postage
I had the same problem with the dvd/vcr and my tv not communicating with each other even though they were plugged up correctly. I called the manufacturer phone # on the instruction manual. What they told me to do is strange, but it worked. They said to switch the bottom "in" yellow connector to the bottom "out".....and plug the bottom "out" yellow connector into the bottom "in". It worked on mine. Hope this helps.
If the original TV doesn't have audio/video inputs, you'll need a DVD/VCR player that has a built-in RF modulator. A RF modulator takes the audio & video and modulates a RF carrier to one of the channels that your TV can receive. In the U.S., this is usually channel 3 or 4. If the DVD/VCR player has a built-in tuner, connect your cable to the RF input of the DVD/VCR player and the RF Output of the DVD/VCR player to the cable input of the TV. This way, you can receive your cable channels through the DVD/VCR player and watch movies as well. If your DVD/VCR player does not have a built-in tuner, you can put a RF switch inline that will allow your TV to either receive the cable signal or signal from the DVD/VCR player.