From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Update on EMI problem.
Date: Thu, 16 Jan 2020 06:32:04 +0800
References: <list-13394152@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-13394152@logan.com>
Message-Id: <B9A64637-6298-4355-BF51-81A6426233B6@gmail.com>

The symptoms in the EC2 and EFIS began after installing a couple of new =
Auto Pilot panels.
Steve

> On 16 Jan 2020, at 4:47 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>=20
> A ground issue somewhere. At battery, ground buss, ground strap to =
engine, ...
> Corrosion or a loose bolt/nut.
>=20
> Just guessing. But if it used to work and no changes were made before =
the symptoms appeared...
>=20
> Yes, I know, easy to second guess the approach of someone else. :-)
>=20
> Finn
>=20
> On 1/15/2020 10:00 AM, Stephen Izett stephen.izett@gmail.com wrote:
>> Hi Bobby
>>=20
>> 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.
>>=20
>> Steve
>>=20
>>> On 15 Jan 2020, at 10:33 pm, Bobby J. Hughes bhughes@qnsi.net =
<flyrotary@lancaironline.net> wrote:
>>>=20
>>> Steve,
>>>  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.
>>>  Bobby
>>>      From: Rotary motors in aircraft =
[mailto:flyrotary@lancaironline.net]
>>> Sent: Wednesday, January 15, 2020 8:06 AM
>>> To: Rotary motors in aircraft
>>> Subject: [FlyRotary] Re: Update on EMI problem.
>>>  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/
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>>>>>=20
>>>>=20
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>>>=20
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