|Mar 04, 2014, 04:57 AM|
Germany, NRW, Meschede
Joined May 2013
Graupner X412 PPM to USB
Hi, I own a quite old 35 MHz Graupner JR X412 radio, that I want to use in FMS on PC via an USB dongle I got from ebay, a Carson flight simulator vii.
The radio doesn't have a DSC plug by default, but I found the PPM output from the control PCB to the HF part (identified by cable color and soundcard o-scope). I don't have a real o-scope, so I can't tell the real voltage of the pulses, but my multimeter reads approx. 0.350 V from Signal to GND. I tried connecting the mono jack of the dongle with those contacts, Signal to tip and GND to shield, but the USB gamecontroller window of Windows (lol) does not show any axis changes when I play with the sticks, only sometimes when I switch off the radio, all axes go to low, and on switching on, some axes go to high.
I then tried a 150 Ohm resistor in between signal and tip of the interface cable, which worked the first time I connected it, so all axes would move correctly when I moved them, but after I disconnected the resistor, it wouldn't work again.
One other time when I was trying some other resistors, I got it working with the resistance of about 5 mm of my finger with which I was holding the jack and signal cable, but that is obviously no suitable solution and only worked the first time, too.
Can you help me with that? Am I, as it worked shortly, missing a resistor or maybe a capacitor in line or parallel? Is the signal level wrong? I wasn't able to find documentation on either the dongle or the radio, so I have to guess here.
Thanks in advance!
Kind regards, Lukas
// I hope this is the right subforum, if not, please move to the appropiate one
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