From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Update on EMI problem.
Date: Wed, 15 Jan 2020 23:00:44 +0800
References: <list-13392348@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-13392348@logan.com>
Message-Id: <F6B2EE1B-5CCE-4016-8F3D-7AE87887A482@gmail.com>

Hi Bobby

I had no symptoms in the engine on tx until the last few weeks and only =
on controller A.
It misses as the mixture goes very lean.
In looking at the engine miss I realised the vertical speed was jumping =
on tx.
Not sure what brought about the change that started the symptoms.

Steve

> On 15 Jan 2020, at 10:33 pm, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>=20
> Steve,
> =20
> I don=E2=80=99t recall if you are just seeing odd instrument readings =
or actual engine changes when you key the mic. At idle and ground ops I =
could almost kill my engine when transmitting on an SL30. The capacitors =
eliminated 90% of that problem. When I swapped the SL30 for a 430W it =
improved a little more.=20
> =20
> Bobby
> =20
> =20
> =20
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]=20=

> Sent: Wednesday, January 15, 2020 8:06 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Update on EMI problem.
> =20
> Hi Finn
>=20
> I only went for them as I understood others had suffered a similar =
symptom and this was Tracy=E2=80=99s recommended fix.
> I=E2=80=99ve got more ferrites coming and I=E2=80=99ll be putting =
these on all inputs to the EC2 and ADHARS and at the feed point of the =
antenna.
> I=E2=80=99ll feedback what I discover.
>=20
> Cheers
> Steve
>=20
> > On 15 Jan 2020, at 9:02 pm, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
> >=20
> > Did you trace the circuit? Any chance there's already caps on the =
board on your version of the EC2?
> >=20
> > Again, I don't see the need for the caps. Especially because your =
problem was only with controller A.
> >=20
> > I would start with temp input or serial input.
> >=20
> > Finn
> >=20
> > On 1/14/2020 11:23 PM, Stephen Izett stephen.izett@gmail.com wrote:
> >> A frustrating few hours
> >>=20
> >> I got down to the hanger this morning to look into the EMI in both =
the engine controller and EFIS.
> >>=20
> >> First thing I did was reroute the radio coax so that instead of =
being in close proximity to many cables down the centre of the aeroplane =
instead down the very right hand side.
> >> This increased the distance to various wire looms by ~450mm.
> >>=20
> >> Prior to this change the symptom outside the hangar was from memory =
about a 300ft/min vertical speed on tx in the Skyview EFIS.
> >>=20
> >> First test with radio tx after the reroute of coax inside the =
hangar yielded a "4 times worse" symptom in the EFIS! ~1300ft/min =
reading on tx.
> >>=20
> >> I then tried the test outside and away from the metal hangar by 10m =
and the symptom was reduced to ~600ft/min and increase in symptoms of =
about 100% on original problem.
> >> I then applied a clamp on ferrite to the cable loom entering the =
ADHARS unit from where the symptom originates.
> >> On tx outside the hangar again the symptoms are far reduced by over =
1/2.
> >>=20
> >> So if I had left the radio coax where it was, the ferrite may have =
fixed the problem in the EFIS.
> >> I have more ferrites on order and they appear to be very effective, =
so will use these to attenuate the RF entering the various pieces of =
equipment.
> >> EMI trouble shooting is indeed a black art!!
> >>=20
> >> I also removed the Engine Control unit and soldered 0.1uF ceramics =
across the outputs to earth of the MAP sensors of both A and B computers =
as specified by Tracy.
> >> On reinstalling the Engine Control unit I was not able to start the =
engine!
> >> It would fire but not run on either controller.
> >> So spark and fuel are present, but not to remain running.
> >>=20
> >> So the mod appears to have messed up the MAP sensing.
> >> My initial thought was that the caps were actually resistors =
packaged wrongly but they measure open circuit.
> >>=20
> >> So the few hours of mods and testing has been exceedingly =
frustrating, going backwards at every turn except for the 1 ferrite =
showing itself to be very effective.
> >>=20
> >> I=E2=80=99m hoping my next outing will be very much more fruitful.
> >> In the mean time I=E2=80=99ll ponder what could possibly cause both =
Computers in the Engine Controller to be u/s.
> >> If I cannot discover my deliberate mistake. I=E2=80=99ll remove the =
caps and retest the Controller on Friday.
> >>=20
> >> Cheers
> >>=20
> >> Steve
> >>=20
> >>=20
> >> --
> >> Homepage: http://www.flyrotary.com/
> >> Archive and UnSub: =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
> >>=20
> >=20
> >=20
> > --
> > Homepage: http://www.flyrotary.com/
> > Archive and UnSub: =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>=20
>=20
> --
> Homepage: http://www.flyrotary.com/
> Archive and UnSub: =
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>=20
>=20
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>=20
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