I've not checked recently but the JR modules to date have had a transistor inverter in the ppm line so the 3.3v Frsky processor input limitation doesnt apply and 5v of ppm should be fine. I'd check how near the 'low' is to ground - maybe its near the upper limit for a '0'. Have a look at the width of the ppm pulses too, see if theres anything weird going on there. Expect somewhere between 200-400uS. The most common reason for an eratic link seems to be power - esp where people have been powering them from the trainer port etc - I'd check the module supply on load, see if the rail is dipping as the module transmits (remembering its a very tx low duty cycle). Try switching the module to low power to reduce its current draw, and see if the problem persists. If it does it might indicate a supply problem. Try a big-ish cap 100uF or more across the pos & neg supply to the module, not as a permanent fix, but just to help isolate a supply problem.tjm wrote:I think my next step will be to check the FRSKY module internally to see if it has protection on the ppm signal.
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