Here are some useful tips for setting up your EyeTV HD with cable boxes or satellite receivers.
Connecting The Infrared Channel Changer
Connect the Infrared Channel Changer cable to EyeTV HD.

Make sure the plug is fully inserted into EyeTV HD. Partial insertion can cause the Infrared Channel Changer to not function as expected.
Orienting The Infrared Channel Changer
Place the infrared emitter (the clear bulb at the end of the cable) so
it faces the front panel of the cable or satellite receiver.
You may need to move the infrared emitter closer to or farther away from the front panel, to maximize performance.
Later,
when you know that it is working correctly, you can hide the cable
under the receiver and use the double-stick pads to secure the emitter
in place.
Choosing The Manufacturer Of Your Cable Box or Satellite Receiver
EyeTV HD provides a long list of manufacturers. Each name in the list represents a series of infrared (IR) codes, that are used to communicate with a certain cable box or satellite receiver.

The manufacturer name (like Motorola) will not always match the name of
your video provider (like Comcast), so you may need to try both.
Some
manufacturers may have more than one entry, with slightly different
product names. In that case, you may need to try both options, if the
first one does not work for you.
Even though a certain manufacturer is listed, new devices from that manufacturer may not yet be supported.
If the manufacturer of your Set Top Box is not in the list, or the correct manufacturer doesn't seem to work, then you can let Elgato Systems Technical Support know the manufacturer and model number of your Set Top Box.
You can visit http://support.elgato.com to report your problem. Please let us know that you tried the steps in this article (number 3796).
We would also like you to send us more information about your Mac:
1) Choose About This Mac from the Apple Menu.
2) Press the More Info... button to start the System Profiler application
3) Select Save As... from the File Menu
4) Save the report as System Profiler 4.0 (XML) format
5) Attach this file to your support ticket