ALL JR and Spektrum DSMx and DSM2 radios are fully operable with each other.
ALL DSM2 receivers will work with a DSMx transmitter, the receivers will bind and operate in DSM2 mode.
ALL DSMx receivers will work with a DSM2 transmitter, the receivers will bind and operate in DSM2 mode.
If you use a DSMx main receiver, you MUST use a DSMx satellite.
If you use a DSM2 main receiver, you MUST use a DSM2 satellite.
Never MIX DSMx and DSM2 receiver components in a single installation.
Your 9503 will bind with, and operate just fine with the AR7000 receiver. As the AR7000 is a DSM2 receiver, make sure you attach its DSM2 satellite.
When binding, don't forget to set your throttle where you want throttle to go if the receiver should ever go into failsafe mode. Typically, you'll want low throttle when you bind.
Enjoy the build, and the heli.
* Making the World Better -- One Helicopter at a time! *