ORIGINAL: jester_s1
DSMX is the new method of doing spread spectrum for Spektrum radios. A DSMX transmitter can work with any Spektrum receiver, whether it is DSM2 or DSMX, but a DSM2 Spektrum transmitter can only work with DSM2. For the end user, it doesn't make any difference in performance.
Eh, not quite true ( though your general gist is correct ).
A DSM2 transmitter WILL work with DSMX receivers just fine, but the receiver will fall back to DSM2 mode when it binds.
That means if you own a DSM2 transmitter and have not yet upgraded it ( most of the Spektrum and JR's ARE upgradeable!!! ) you CAN go out and get DSMX receivers NOW, and upgrade the TX later.
I'm flying with a couple of DSMX RX's on my yet to be upgraded 9503 DSM2 TX.... it works fine.