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Magneto noise on EGT & CHT (Read 64 times)
Apr 15th, 2018 at 12:36am

David Brown   Offline
Senior Member

Posts: 468
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Has anyone experienced noise on their thermocouples induced from the magneto's. these are Bendix 1200 mags, with screened cable and grounded well on the mag body.

The EMS module is very well grounded too. We are going to look at segregation to the most possible, however I have not seen this before in other installations.  Shocked

Any suggestions welcome.
 
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Reply #1 - Apr 16th, 2018 at 6:28am

RayInGA   Offline
Senior Member
I love aviation!
Richmond Hill, GA

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Posts: 408
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You might consider installing some noise filters available for some Bendix mags.

http://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php?clickkey=351095
 

Ray Eaker
RV-7A flying since 27 Jan 2017
Dual Skyview 1000T with all available Dynon VFR goodies
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Reply #2 - Apr 16th, 2018 at 2:43pm

David Brown   Offline
Senior Member

Posts: 468
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Hi Ray,

I had looked at that, however those filters are for the old bend mags that did not have internal capacitors, or so I believe. Adding capacitance might work but what are the negative effects on the points.

One of the good folk at Dynon has reminded me of capacitive D SUB filters, which I have used in the past for other avionics (early D10's that put out radio noise) and industrial automation jobs.

Thanks for the thought, and if you know more about doubling up capacitors on magneto's let me know, because adding one in parallel will add the capacitance.

Smiley
 
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