Actually the RF power meter you describe is not that expensive when you consider what it does.
However I think I will have a go with the FrSky LCD display and the Spectrum Analyser for a bit. I'm really looking for differences between modules (i.e checking for damage.) (I have another 2 on order for comparison.)
It is the 100mw TX modules that I'm using at the moment. I was using the 1W module (turned down to power level 4 to keep it legal) before my problems started and this module seems to give longer range now. (As well as I can measure it by stepping down the road. The neighbours are getting suspicious!)
But Dave J is having no range problem with his 100mw module.
By the way David - I checked the Orange TX module and the aerial does not seem to be connected. (No lands connected on the printed circuit board.)