Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: how do I connect to a scientific atlantic explorer 4250hdc cable box? I cannot get a signal to the extra television.
Document: I have to tell you I was some what skeptical about how good the picture quality would be when I opened the box and began the installation process. I hooked it up to the HD Scientific Atlantic cable box in the living room and plugged the power in and aimed the antenna in the general direction of the kitchen. I then connected it to the 20 inch LG television and aimed that antenna in the general direction and plugged it in. WOW, picture and sound quality are spectacular.
I had a Terk transmitter/receiver to use for an extra television in my home. I accidentally broke it so ordered this different brand. This one is actually a much better system. I don't get the interference from my cordless phones and microwave that I got with the Terk. Love it!
So since I don't need to get an extra cable box, I will definitely save money in the not-too-long run by not paying box rental or any other fees. Additionally, it gives us the option to occasionally put the TV on the other side of the kitchen when we need extra space to work.
This item does exactly what it is supposed to, for me. My extra TVs are only one room off to one side and one room off to the other side and it works great. I am going to try one more to set up TV in the garage, so I will see what happens there as it is a bit further away, but my expectations are high.I would definitely get this if you want to transmit TV from your cable box to a TV that is in an entirely different room.
The signal travels through 3 walls and the receiver is right next to a cordless phone. Our cable company stopped the analog signal and a digital cable box is required for each television in the house (at additional cost for each box, of course), I was unwilling to pay a monthly fee to the cable company for service to a television that is only watched 20 or 30 minutes a day for weather and news while the family gets ready in the morning. This is the perfect solution for my problem.
After searching around on the internet I came across this item. I was a little skeptical about it working to send a signal from an upstairs cable box to a TV that I wanted to mount one floor below it in a garage. After hooking it up and roughly pointing the antennas towards each other I must admit the picture is perfect. I can now watch and control the extra TV just as well as if I ran coax cable right to it. So far I have been really happy with the product.
I have satellite TV and thus a receiver box with a standard RCA jack type output plus an S-video output. No hi def yet, but I have TV's in three locations and was paying for two receivers. With this unit hooked to the main unit, it broadcasts to a second television and even carries the stereo sound. Out of the box, cables included, set up time is minutes. You get a transmitter and a recever and an IR remote control repeater.
So if you have any kind of scientific atlanta cable box the ir blaster will not work. I called tech support and of course they know all about the issue but you never find out until you buy it and the guy actually said I should buy a seperate ir sender...unbelievable.
I use this device to relay audio and video from my surveillance system in the basement to the TV in my family room. Don't use it often and it serves it's purpose, but it's nowhere near as good as a physical A/V cable. The receiver and transmitter are only 30 feet apart (transmitting through walls and floor - but certainly in the stated range) and I get very annoying, intermittent static that would really prevent me from using this with any kind of continuous use like watching television or a movie.
This product is everything I hoped it would be. I got tired of making and fixing holes in my walls to get the signal from my Directv receivers to different TV's in the house. I can take the wireless receiver outside and watch sports with a clear picture. The ability to change channels wirelessly was an extra bonus.
Answer: Deta, I'll need more info about what you've done so far. I have to assume that you've followed the instructions that came with the RF Link - if you've wired up the transmitter at your cable box and the receiver to your extra T,V, making sure that you've got the red, white, and yellow cables going to the same colored connectors on the box and TV and the RF Link isn't defective, then you may have too much distance between the cable box and the extra TV. 50-75ft is a good distance. You also want to make sure that there is no large metal object (refrigerator, metal cabinet) in the DIRECT path between the 2 link boxes. Next the 4 buttons on each link box - I set the link transmitter arbitrarily on #1, then at the tv link, push the button to scroll thru 1,2,3,4. Some transmitters also have a small 4 position slide switch on the rear. Do the same scroll excercize. Most problems are either crossing wires (red to white, yellow to red etc) or too much distance between between the links. Hooking up the links is no different than hooking up a VCR or DVD player - just think of the link transmitter to be the TV to the cable box, and the link receiver as a VCR hooked up to the remote TV. Good LuckDen M.