An infrared repeater, also known as an IR blaster, is a device that allows an infrared remote to control a tertiary device. Some models simply extend a remote's function with its own companion device, allowing it to be used across long distances or through walls. The setup of these devices is easy; configuring the primary devices (DVRs or computer-based TV tuners) is usually much more involved. The setup process will vary depending upon what device you're using the IR blaster with.
Plug your DVR into the same AC power outlet or surge protector as your TV and cable/satellite receiver. Place the DVR next to the receiver, not above or below it.
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Plug the IR blaster into the back of the DVR. Place the infrared transmitter--the plastic piece at the end of the cable--in front of the DVR's infrared receiver. Some IR blasters use two separate transmitters placed above and below the DVR.
Turn on your TV, receiver and DVR. Follow the setup instructions on your DVR to program your remote.
TV Tuner Card Setup
Place your home theater PC near your satellite/cable receiver and TV. Plug the IR receiver and the blaster into your computer's tuner card.
Position the IR receiver where your remote control can access it via line of sight. Place the blaster in front of your TV and receiver.
Turn on your TV, computer and receiver. Launch the media center or tuner program on your computer to configure your remote.
Extended IR Setup
Place the infrared receiver where your remote can access it via line of sight. A good spot in on top of your television, in your entertainment center, or on a satellite speaker. Plug the receiver into an AC wall outlet or surge protector.
Place the infrared blaster directly in front of your AV equipment. If you are controlling multiple set-top boxes (like a DVD/Blu-ray player and a cable box) place it about 8 inches away from all devices' IR receivers.
Use your remote to control your devices. Depending upon where you placed the receiver, you may need to point the remote in a direction other than directly at your TV.