ORIGINAL: UKpatternflyer
He asked me to do some measurements "just to be safe". I measured the voltage rail on the receiver with a digital storage scope (100 MHz BW), and saw spikes of +/- 20 Volts or more on the supply rail of the receiver!
Hi Carston,
have you tried an in-line ferrite ring, as per Shanes' suggestion? Thats exactly the kind of thing an inductor would help with.
Keith,
Do you use a Switch between the Receiver (9 channel) and the Ignition. I am presuming so. Will a normal JR switch do?
And how about a 6V regulator: is that too much voltage for the ignition? i.e. should one definitely use 5.7V or some regulator lower than 6V? I would hate to mess up the Ignition!
atul
Hi Atul,
Here's the circuit I've tried on 35MHz 149 PCM receiver. The regulator takes the voltage down to 5.5V into the receiver and the Emcotec switch regulates to 5.5V also. It worked ok on the ground and for most part in the air. However the model seemed to experience momentary freezing of the ailerons in flight; i.e. when I rolled, it would appear to roll a bit further than I'd input. I've experienced this before with a stick pot fault on my 14MZ tx, so I tried a second Tx but with the same issue. My guess is that the Ignition unit is doing something to the receiver function. So I can't really recommend this approach any more.
I've now gone 2.4 GHz and will adopt Shanes' approach (see post and see how it goes. Does anyone know if YS recommend a particular method for this
Keith
Hi Keith,
I know that various filters etc can cure the spikes, but when looking at the spikes, they seem to contain a great deal of energy (wide spikes), and my feeling is that there is a need for so much filtering that it makes more sense to mount a small battery to supply the CDI device instead. As I told Torben, he wont get me to "sign the paper" that it is 100% secure to fly with, and he is not going to risk any of his two pattern planes because of that.