From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Fwd: [FlyRotary] Re: Engine miss
Date: Sun, 12 Jan 2020 17:19:44 +0800
References: <list-13384282@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-13384282@logan.com>
Message-Id: <F14864FA-CA06-4D2E-9FCA-71E8B9729843@gmail.com>

Hi Bobby

Today we did some tests on the system.
Replacing the antenna with a dummy load revealed as expected no symptoms =
in either the EFIS and EC2
The antenna analyser revealed a reasonable antenna with a VSWR of =
~1:1.25

Both experts on site today recommended adding ferrites to wiring =
entering the ADHARS and EC2
I will pull the EC2 and check for the caps on the MAP sensors, but from =
a photo I have of the component side of the board they do not appear.
On which side did Tracy add the caps?
Hoping these fix the problem, and if not will shield the temp input the =
A.

Thanks Bobby.

Steve Izett


> On 12 Jan 2020, at 8:44 am, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>=20
> Steve,
>=20
> Tracy installed the capacitor on both MAP sensors not just the A. =46rom=
 memory, I believe the sensor manufacturer recommends using a capacitor =
in their documentation.
>=20
> Shield wire for the temperature sensor might be worth a try.=20
>=20
> Bobby=20
>=20
> Sent from my iPad
>=20
>> On Jan 11, 2020, at 6:09 PM, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>>=20
>> =EF=BB=BFThanks Bobby
>>=20
>> If I cant fix the RFI at the Source I=E2=80=99ll pull the EC2 and =
check it.
>>=20
>> Did Tracy ever explain his "long answer" as to why Processor A has =
had problems and not B?
>> All I can think of is the intake temp input.
>>=20
>> I=E2=80=99m wondering how do you identify the EC2 processors as A & B =
when I=E2=80=99m looking at the PCB?
>>=20
>> Cheers
>>=20
>> Steve Izett
>>=20
>> > On 12 Jan 2020, at 12:43 am, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>> >=20
>> > Steve,
>> >=20
>> > I believe Tracy started adding the capacitor to all newly built =
EC2/3 so you may already have it. It=E2=80=99s very small and was =
soldered across two of the three MAP sensor legs on the EC2. Not sure if =
it was installed the same way on the EC3=E2=80=99s.=20
>> >=20
>> > Bobby
>> >=20
>> > From: Rotary motors in aircraft =
[mailto:flyrotary@lancaironline.net]=20
>> > Sent: Friday, January 10, 2020 9:20 PM
>> > To: Rotary motors in aircraft
>> > Subject: [FlyRotary] Re: Fwd: [FlyRotary] Re: Engine miss
>> >=20
>> > Thanks Andrew.
>> >=20
>> > So Tracy never explained the =E2=80=9Clong story=E2=80=9D?
>> > Did you add the caps and did they help or not?
>> > I=E2=80=99m thinking not, as you mentioned changing to a better =
shield to the CAS=20
>> >=20
>> > Steve
>> >=20
>> > > On 11 Jan 2020, at 10:30 am, Andrew Martin andrew@martinag.com.au =
<flyrotary@lancaironline.net> wrote:
>> > >=20
>> > > Steve. Here is the post from Tracy regarding engine miss on A =
computer.
>> > > Andrew
>> > >=20
>> > > ---------- Forwarded message ---------
>> > > From: Tracy <flyrotary@lancaironline.net>
>> > > Date: Tue, 26 Jul. 2016, 11:22 pm
>> > > Subject: [FlyRotary] Re: Engine miss
>> > > To: Rotary motors in aircraft <flyrotary@lancaironline.net>
>> > >=20
>> > >=20
>> > > HI Andrew,
>> > > The exact cause of A having the problem and not B is a long story =
but the fix is to install a .1 uF capacitor across the ground and output =
pins (1 and 2 I think) of the A controller MAP sensor. I'd do it for you =
but I'm away from my shop until mid Oct.
>> > >=20
>> > > Tracy Crook
>> > >=20
>> > > Sent from my iPad
>> > >=20
>> > > > On Jul 26, 2016, at 03:56, Andrew Martin =
<flyrotary@lancaironline.net> wrote:
>> > > >=20
>> > > > I must have really upset Murphy, I just cannot seem to get a =
break with this plane.
>> > > >=20
>> > > > I need help from an EE or anyone who gets a kick from lectrics.
>> > > >=20
>> > > > 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?
>> > > >=20
>> > > > A&B are tuned slightly different, B is still at pre engine =
rebuild state, but I cannot see how that would be a factor.
>> > > >=20
>> > > > 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?=20=

>> > > >=20
>> > > > Andrew
>> > > >=20
>> > > >=20
>> > > > --=20
>> > > > Regards
>> > > > Andrew Martin
>> > > > Martin Ag
>> > >=20
>> > > --
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>> >=20
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>> >=20
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