If you want to remove the "red spot" then look here:
http://www.satcure.com/accs/page5.htm
DigiMemo
This module simply plugs into the RF2 output socket at the back of your Sky Digibox. If the mains power fails, the Auto-On switches it back onto a preset channel, a minute after power returns.
The DigiMemo allows the default channel to be set by the user.
It also sends the 'backup' command every minute to get rid of the dreaded "red spot" in the corner of the screen.
Ideal for Hotel installations, shop displays and places where you can't afford to have the Digibox remain in standby.
Excellent for TiVo owners who suffer from mains interruptions, the DigiMemo 1 will ensure that your Digibox is always ready for those recordings which you don't want to miss. A special version is available now for the Sky+ PVR.
We can also provide customised versions for radio station or 'other channel' selection, where the required default channel is not contained in the EPG. Contact us with your requirement.
Ideal for SMATV systems, driving each digibox back to your assigned channel after a mains interruption.
Now available: the Digimemo2, Digimemo4 and Digimemo6, which can control 2, 4 or 6 Digiboxes (including Amstrad, Grundig, Pace, Panasonic and Sony - or a mix of these).