I made the serial interface for FMS, I am using a JR 388S radio and the signal is very unstable. Calibrating won't help. Signal out to serial looks stable in my osciloscope.
Any clue ?

Thanks!

Did you make the "standard" or the PIC interface

I made the standard serial interface

I've had a lot of trouble with JR in the past because of the low voltage floating output. You might have better luck using the JR specific version at http://www.customelectronics.co.uk/fmscrktj.htm or mine at http://members.lycos.co.uk/SteveLewin/index.html (which is just an extra transistor on the front of the standard version).

Steve

I am using the circuit with 2 transistors and the signal is very stable at the output towards the PC ( pin #9), I can see it with the osciloscope.
All I am getting is unbstable movements when in the calibration screen and of course the model is unflyable.
Thanks

I might have a defective component.
I will check and I will let you know guys.
Thanks for your kind support.
Keep in touch !