it seems that JR had to go with frequency hopping tech of futaba in japan due to the regulations there. they have named it DSM J.
what's below is taken from another thread on this....
"JR has a 12X DSMJ 2.4 ( signal hopping) version and a 9303 DSX 9G 2.4 " GOLD-LIMITED EDITION" available in JAPAN and the ASIAN hemisphere. Been told that signal hopping is required in Japan. Too bad the American consumer is apparently closed out. That's marketing for you.
Very true in that observation but.... for the Japanese market if you use DSSS based systems (which is whatSpektrum is albeit a Hybrid) they are limited to 10mW EIRP. For the full 100mW, it has to be a FHSS based system.... hence DSMJ being developed by JR with assistance.
anwar any idea on this ? it seems futaba may come out as the only company for 2.4 ?
guys google on this and come out with something.........