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Jim Baker
Joined: 30 Mar 2006
Posts: 181
Location: Sayre, PA
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 Posted: Mon Aug 28, 2006 7:06 pm Post subject: Mag noise filters..... |
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Is anyone aware of a master list or good explanation floating around
as to the utility/need for filters as used on magnetos? I'll call TCM
tomorrow to get their take on the situation on the Bendix series.
Reason I'm asking is I'm almost done with the install of a rebuilt
IO520K1B that replaces the old original Phase 1 case (cracked
about 3/4 way round the #6 cyl in flight) in a Bellanca Viking. The old
mags had one filter on the right mag and none on the left...which
seems kind of odd but I did nothing about it since all my comm was
good. Any guidelines appreciated. Some of the data I've seen says
the need for a filter depends a great deal on the mag capacitor
design and its frequency characteristics.
Jim Baker
580.788.2779
'71 SV, 492TC
Elmore City, OK
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nuckollsr(at)cox.net
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| Posted: Mon Aug 28, 2006 7:47 pm Post subject: Mag noise filters..... |
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At 10:02 PM 8/28/2006 -0500, you wrote:
| Quote: |
Is anyone aware of a master list or good explanation floating around
as to the utility/need for filters as used on magnetos? I'll call TCM
tomorrow to get their take on the situation on the Bendix series.
Reason I'm asking is I'm almost done with the install of a rebuilt
IO520K1B that replaces the old original Phase 1 case (cracked
about 3/4 way round the #6 cyl in flight) in a Bellanca Viking. The old
mags had one filter on the right mag and none on the left...which
seems kind of odd but I did nothing about it since all my comm was
good. Any guidelines appreciated. Some of the data I've seen says
the need for a filter depends a great deal on the mag capacitor
design and its frequency characteristics.
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Fly it and see if you need it. The magneto already has
a pretty high quality capacitor right across the
p-lead as it exits the case. Wire with shielded wire
as illustrated in Figures Z-26/Z-27 of
http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf
and I believe you're unlikely to need any additional
filtering.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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