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Mark Sletten
Joined: 10 Jan 2006
Posts: 43
Location: St. Jacob, IL (Near St. Louis, MO)
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 Posted: Sat Apr 15, 2006 5:32 am Post subject: Avionics=Black Art |
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Angier,
I've taken the liberty of forwarding your question to the AeroElectric-List
on the Matronics list server. This list is moderated by Bob Nuckolls and
read by many 'lectric-smart people (I'm a reader, but not one of the
'lectric-smart ones). Hopefully someone there can answer your question, and
you might consider joining the list -- lots of good info there.
Regards,
Mark & Lisa Sletten
Legacy FG N828LM
http://www.legacyfgbuilder.com
[quote] --
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_________________
Mark Sletten
Legacy FG N828LM
http://www.legacyfgbuilder.com |
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ceengland(at)bellsouth.ne
Guest
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| Posted: Sat Apr 15, 2006 7:37 am Post subject: Avionics=Black Art |
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Impossible to give an answer to the specific question without seeing the
diagrams for the products, but the general answer is this:
If the shield is nothing but a shield, it probably should be grounded at
only one end. The most obvious example is the shield on a magneto P-lead.
If the shield is actually the ground return for the circuit (common
occurrence for audio & RF antennas) then it must be *connected* at both
ends, which isn't necessarily the same as being *grounded* at both ends.
The most obvious example for this is headset & mic wiring to the
intercom or radio. In those cases, the shield is also the ground return
for the mic & headphones, so must be connected to both the intercom &
the jack, but it must *not* be *grounded* at the jack; that's why you
are instructed to use insulating washers on the jacks. This is where
the ground loop can show up, when there would be 2 paths for the return
current to follow: the shield line & the airframe.
(hope that didn't just stir up more mud in the water...)
Mark & Lisa wrote:
[quote]
Angier,
I've taken the liberty of forwarding your question to the AeroElectric-List
on the Matronics list server. This list is moderated by Bob Nuckolls and
read by many 'lectric-smart people (I'm a reader, but not one of the
'lectric-smart ones). Hopefully someone there can answer your question, and
you might consider joining the list -- lots of good info there.
Regards,
Mark & Lisa Sletten
Legacy FG N828LM
http://www.legacyfgbuilder.com
>--
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http://www.matronics.com/Navigator?AeroElectric-List |
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