Hi Everyone,
I was taking a glance at the OI reference guide and it seems that there are 6 different channels available, but only 5 may be used simultaneously if you are using a 2007 model radio. (Page 16, section 14)
are the 2006 radios compatible with 2007/8 OI?
would we be able to use 4 2007 radios and 2 2006 radios in order to get 6 different channels?
Thanks alot for your help, from the Israeli FIRST community!
-Leav
We actually used all 6 channels at our Pre-Ship scrimmage. We did post warning to the teams that their might be interference, but as far as we could tell, everything went ok when the team numbers were programmed correctly and the robots were all working 
IFI did tell us there was nothing else we could do about it (old radios or anything else), but as I mentioned, it seemed to work ok. Just make SURE that you have ESTOPs!
the radios are compatible, but you must use the old radios on BOTH the OI and the RC.