Do most Free-to-Air MPEG-2 receivers modulate the signal out to a TV via the coax cable and use channel 3 or 4?
Most analog receivers have a switch on the back of the unit for Channel 3 or 4 but this is not the case with most MPEG receivers. This is controlled through the menus. If you can’t get the menus up and you have a rolling picture, change the channel on the TV to either 3 or 4 so you can view the menus.