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Steve,
This is a composite airplane?
Before starting to eliminate effects, I'd suggest you make sure that the transmitter, cables and antenna is not the cause. You're sure you have a real good coax - perfect shield/ground on both transmitter and antenna end? Good solid connector grounds -- no corrosion? How about grounding of transmitter (path to battery)?
You could try a handheld transmitter for testing.
In Tracy's fix, notice the period. It's 100nF not 1uF. Probably not that important but could slow the MAP sensor response.
Finn
On 1/10/2020 6:31 PM, Stephen Izett stephen.izett@gmail.com wrote:
Hi people
Ive had an opportunity yesterday to begin the journey of chasing down this miss in the engine / EC2 on radio TX.
I discovered that the gremlin is getting into the EC2’s A computer but not the B
Switching to B there is no hint of a problem.
I’m thinking there are two substantive differences between EC2 A & B processors/computers.
1. The B computer has the capacity to turn off the leading and trailing coils for testing, that the A computer doesn’t have.
2. The A computer measures the intake air temp to determine O2 molecules in intake charge which the B computer doesn’t.
So I’m wondering if the intake temp input (thermistor) on the EC2 A computer is the antenna for the RFI to get in.
Disconnecting this line to the the EC2 A computer in order to identify if this is the problem is going to be a pain but maybe a necessary fault finding path.
Has Tracy or anyone put a small Capacitor on inputs to filter RFI?
Thanks for any input you can offer.
Steve
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