The environment I fly in is criss crossed with high power transmision and power lines, the UK has very crowded airwaves and therefore is a faily harsh environment for any system in a built up area, we fly on an estuary that has communication masts on either side of it, IFS /XPS just would not work on my site, the lock out where consistant and total, ordianary PPM has glitches, PCM seems to be reliable, but all 2.4Ghz except IFS seems to work OK, I have not tried the new system from Graupner nor intend too, as I have said before once bitten twice shy.

Mike