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EVO trainer wireless
The bottom side, it was easy to locate the PPM signal just before the decoder chip to the servos
The Royal EVO 9 transmitter.
All the noise generating digital parts was covered with tape.
On top of the tape some copper shilding was added, and soldered to ground.
Over the copper shilding more isolating tape was added
The white wire is the PPM signal
The PPM signal is inverted using a N-FET, pin 2 is powersupply after the EVO switch, red wire
The inverted PPM signal from the FET goes into pin 4
The reciever is mounted using double sided tape, note the antenna is made as bad as possible on purpose.
The student transmitter must be in a 50meter range.
Ready done ! battery back in place.
The channels transmitted from trainer is defined as channel 1 first then 2 and 3 and so on.
Here all 3 channels are at center position = 1.6mS each pulse time.
You can make the trainer controll ailerons and elevator only if you like.
The Evo will even trim and remember trims on the trainer !
The EVO switch is intelegent, so it automaticly switches trainer off if cable falls out.
Remember the Servo - Monitor only works with trainer signals, if EVO is in RF transmit mode !
Note the servo center positions in normal mode, then switch trainer on, and adjust the trainer transmitters trims to exactly the same numbers on the EVO.
then never move the trainer trims from that day !! the evo will trim the trainer also and save it digitally.
more info in the Royal Evo Manual at page 92 and page 93