Connect a Standard Definition (SD) TV adapter to an HDTV

Connect your SD TV adapter

To connect your SD TV adapter to your HDTV, you'll need a splitter, five coaxial cables, and an A/B switch.

Note: If you have an HD TV adapter, you will not need an A/B switch.

1. Connect one end of a coaxial cable to the cable wall outlet.
2. Connect the other end of that coaxial cable to the IN of a splitter.
3. Connect a coaxial wire from one OUT of the splitter to one IN of the A/B switch.
4. Connect a coaxial wire from the other OUT of the splitter to the IN of the SD TV adapter.
5. Connect a coaxial wire from the OUT of the SD TV adapter to the open IN of the A/B switch.
6. Connect a coaxial wire from the OUT of the A/B switch to the IN of the television.

Note: If your HDTV has two RF inputs, you do not need an A/B switch — you can connect the outputs of the splitter directly to the two RF inputs on your TV.

Having trouble?

• Make sure your TV and SD TV adapter are both set to channel 3, unless instructed otherwise.
• Keep your SD TV adapter on at all times, and use your Xfinity remote control to turn your TV on or off.
• The SD TV adapter supports a screen aspect ratio of 4:3; your picture will not fill the screen of a widescreen TV.
  • While you can't adjust the aspect ratio on the SD TV adapter, you may be able to "stretch" your picture in your television's Settings menu.
  • To receive HD programming, you'll need an HD TV adapter or to upgrade to a digital TV Box or HD TV Box.