ORIGINAL: AWorrest
The other point that Jon made should be emphasized. Jon said the 9303 should be set in the program trainer not the normal trainer mode. I would go further and state that if the master 9303 has one its primary channels set to reverse rotation, NEVER use the normal trainer configuration. Always use the program trainer mode. As long as one or more of the more primary channels are set to the program position, things work right. Otherwise if one or more of the master primary channels are set to reverse rotation, there is no way to get the slave transmitter to control in the reverse channel properly using a 783 or 8103. (If the slave is a 9303 and it is set to master not slave, it will work, sort of. The slave settings have to be set identical to the master.)
Allan Worrest
We found the same thing using the 10x as the slave. We could not get the mixes correct at all in the 10x in normal mode on the 9303, because of the servo reversing issue. That is when we started playing around and found that putting the 9303 in the Program mode made things work. Saves a TON of time also, trying to get the slave set up the same as the master. Since all of the mixes, expo, throws etc are controlled by the 9303 in the Program mode, there are no worries about an incorrect setup on the slave.
Jon Lowe