Futaba AM NOT COMPATIBLE WITH REALFLIGHT
After doing some research. Findings show (old) Futaba "AM" radios are not compatible with RealFlight.(even though PPM is present in AM)(pin 1, PPM Out, outer ring, ground
) The reasoning:
Contact with Futaba, Yielded the response; Thank you for contacting product support. Unfortunately, the pinouts, are proprietary information, that Futaba does not publish.
They did refer me to a Radio Repair shop, Who told me; regarding a Futaba FP-T7FG/K, AM transmitter, with round 5 pin (180 deg.) DIN trainer port.:
The big problem is that, this transmitter has 1.3 µs neutral, which makes it unusable for any SIM, including RealFlight. He needs to find the FM version which is 1.5 µs which is the standard for today, or better yet, just purchase a new radio.
Note: µs = microsecond = millionths of a second = .000001 second
1.3 µs, WAS the neutral setting, that the transmitters were configured for. Years ago, most manufacturers used their own designs and set the main neutral of the TX at whatever they liked. Today, all manufacturers us 1.5 µs for this. All ESC's and electronics are designed around this, so this makes them compatible with all systems.
Hope this helps someone.