Andrew, all a PTT is supposed to do is provide ground to the output stage transistor of your radio, completing the circuit to enable transmit.
Separate the EC2 from the radio power source – at least temporarily. I would recommend wiring your EC2 (+12V and GND) directly to a standby battery – see what
happens.
Have you got a second radio? – Does the PTT have the same affect when connected to it??
Jeff
From: Andrew Martin [mailto:flyrotary@lancaironline.net]
Sent: Tuesday, July 26, 2016 5:56 AM
Subject: Engine miss
I must have really upset Murphy, I just cannot seem to get a break with this plane.
I need help from an EE or anyone who gets a kick from lectrics.
Since putting the engine back in the plane I have an issue whenever I push the PTT the engine runs like crap. Finger off PTT all good immediately. And this only happens on A computer, B seems unaffected on EC2, how can this happen?
A&B are tuned slightly different, B is still at pre engine rebuild state, but I cannot see how that would be a factor.
I just cannot see how the Radio transmission can affect one computer & not the other, they are identical aren't they, in the same box connected to the same wires. Is it possible I've damaged the EC2 sometime in the past and just not noticed
it, how would I check it now?
--
Regards
Andrew Martin
Martin Ag
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