nairb – 2 minutes ago »
I can’t remember what the combination was. It may have been BBC1 and BBC2 as I remember at one time being “told by the box” to switch the BBC2 recording to BBC2 Wales!
I’ll do some experimenting when I’m next in France in January.
Basically you need to start a recording on a channel that is not on the suspect transponder but is the same frequency band and polarisation as the suspect channel. This will tie up tuner 1, now tune to a suspect channel and use Menu – System – Diagnostics to look at tuner 2 strength and quality.
While recording you can flick through all the channels that tuner 2 can access by using the programme up/down buttons.