What is an RF solution?

Filter Channel 3/4 and inject signal with RF modulator?

• I want to cheaply distribute a video signal in my house using the coaxial cable from the cable system. I see that there are expensive systems to do this, usually using a notch filter for cable channel 78 or so and an expensive RF modulator box to inject the signal onto the coax. I'm curious if it is possible to do a temporary poor man's version of this system using one of those old channel 3/4 RF modulators that used to come with video game systems like the original NES. The idea is that I would install a notch filter on the coax branch that I want to use to eliminate the signal on that channel, then I'd connect a video source to the RF modulator (or a VCR with video in and RF out) and instead of connecting it to a TV, connect it to the wall coax outlet to inject the signal. TV's on that branch of the coax should then be able to receive this signal. Obviously the quality probably wouldn't be as good as a more expensive solution, but would it work at all?

• Answer:

  Yes it absolutely will work...The only problem is that the elimination filter MUST do a good job of eliminating the channel you don't want. Channel 3 would be a good elimination choice BUT the filter is next to impossible to find at a reasonable price. IF IF IF you can find an channel 3 elimination filter cheaply then get it. FYI- in technical terms you want a -55dB or less signal on a channel to insert a new channel on it in DVD or higher quality. The best option is probably a what you suggested a notch filter that eliminates channels 71 to 73 and and an inexpensive RF modulator to broadcast on one of those channels I have sourced you both total $65 plus shipping. I DO NOT OWN OR ENDORSE THE COMPANY only that the equipment they are selling will do what you want IF the specs are as advertised on the web site. Just make sure you don't want any of the channels the filter eliminates.