From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] radio tx problem
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Sat, 11 Jan 2020 09:30:38 -0500
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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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