I don't understand "preset stations".
I have many CCF file that include a signal identical
to the channel up signal (in all three of those
setup codes). In all cases it seems to be a channel
up command (for various brands and models of receiver).
Most receivers allow you to "preset" stations (like your car radio). The 3 receivers I use all select those presets using Channel UP and DOWN to scroll through the list. My guess is that's what's being referred to here as well.
