The X9503 2.4 contains a Trainer System that allows 
the instructor to transfer some or all of the primary 
flight control functions (Throttle, Aileron, Elevator and 
Rudder) to the student. It also allows for indicating if the 
transmitter is to be the Master or Slave. The Trainer (TRN) 
switch transfers control to the student when the X9503 2.4 
is being used as the Master/Instructor transmitter. All Dual 
rates and Exponential settings in the Master transmitter 
are transferred to the Slave transmitter when the master 
transmitter channels are selected individually in the trainer 
menu. The Slave transmitter battery must be charged.
1. Connect the Trainer cord between the Master and 
Slave transmitters. Turn the power on to the Master 
transmitter. The Slave transmitter remains powered off 
and can even have the module removed.
2. Make sure the Slave transmitter is in the PPM/FM 
modulation mode. If the slave system is a X9503 2.4 or 
any other Spread Spectrum-only system, such as other 
JR 2.4GHz or Spektrum systems, this does not apply.
3. Highlight and select Trainer in the FUNCTION LIST to 
obtain the Trainer Display.
4. If using the X9503 2.4 as the Master transmitter, select 
the channel(s) the Slave transmitter will operate when 
the trainer switch is depressed.  
When all channel selectors are in the MAST position, 
the slave system must be programmed for the model, 
meaning all programming necessary for the model 
must be programmed in both the master and the slave 
systems. Also when all the channel selectors are in the 
MAST position, the slave system should be left in normal 
default MASTER mode. To transfer only certain channels 
to the student, highlight and select the channels you 
will transfer, moving the indicator for these channels to 
the SLAV position for these channels. When less than 
all channels are selected as SLAV, PROGRAM T appears 
on the display indicating that the Trainer System has 
been programmed to transfer only selected channels. 
When the channel selectors are in the SLAV position, 
all programming of the master system will be used, and 
only the stick movements of the 4 primary channels are 
used from the slave system when control is given to the 
slave transmitter. In this case, the slave system does not 
need to be programmed for the model. Also the slave 
system should be set to Slave mode in its trainer system. 
The X9503 2.4 is now ready to be used as the Master 
or instructor transmitter. Depress the Snap Roll button 
to transfer control to the student. Control will remain 
transferred until the Snap Roll button is released.
Highlight and select 
MASTER and the display will switch 
to SLAVE. A message appears instructing to Connect 
DSC & POWER off
. Make sure the transmitter power 
switch is in the OFF position and the DSC or trainer cord 
is connected between the 2 transmitters. 
If the master system is an XP9303, X9303 2.4, X9503 
2.4, or 12X and the individual channels are not selected 
in the master system’s trainer function, leave the slave 
system’s trainer function in the default MASTER setting. In 
this case, both the master and the slave systems must be 
fully programmed and set up to fly the model including all 
servo reversing, travel adjust, program mixes and all other 
necessary programming.
You can now use the X9503 as the Slave or student 
transmitter.
The X9503 2.4 contains a Timer System with three 
timers. One is an integrated timer that keeps track of 
total transmitter-on time for the model and it displays 
on the Main screen. You can configure the other timers 
as Countdown timers or as Stopwatches. These timers 
also appear on the Main display when active and can be 
started, stopped and reset from the Main display.
1. To configure a timer as a Countdown timer, highlight 
and select 
Timer in the FUNCTION LIST to obtain the 
Timer display. 
Highlight and select INH under TIMER and then select 
DOWN-T. Use the Selector to set the countdown start 
time. Once the timer is set, TIM will appear on the Main 
display in the lower left corner. You can program the 
timers to several different buttons or switches. Use the 
Selector to highlight the desired button or switch to 
operate the timer. Press the Selector to confirm the 
selection.
2. To Reset the Integrated Timer, highlight and select the 
time under 
INTEG-T and Push [CLR]=0:00 appears 
on the display. Press the CLR button to the left of the 
display to reset the integrated timer.
When all channel selectors are in the MAST position, 
NORMAL appears on the display and all 4 channels 
are transferred to the student when the trainer switch is 
depressed.