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duawil
Joined: 25 May 2006
Posts: 10
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 Posted: Mon Nov 06, 2006 10:46 am Post subject: Slick mag P-lead ground wire |
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I see the P-lead and the ground lug on the back of the Slik mag.
I know I need to use a coaxial wire with the center conductor on the
P-lead and the braided outer conductor on the ground lug.
Two questions:
1) What gage wire do I use. I have some 22 gage coax already run, but is
ths big enough.
2) Do I ground the center conducto to a local ground point at the switch
on the panel or do I ground it to the coax outer conductor?
Thanks
Duane Wilson
RV9A
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nuckollsr(at)cox.net
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| Posted: Mon Nov 06, 2006 8:30 pm Post subject: Slick mag P-lead ground wire |
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At 10:42 AM 11/6/2006 -0800, you wrote:
| Quote: |
I see the P-lead and the ground lug on the back of the Slik mag.
I know I need to use a coaxial wire with the center conductor on the
P-lead and the braided outer conductor on the ground lug.
Two questions:
1) What gage wire do I use. I have some 22 gage coax already run, but is
ths big enough.
|
22 is electrically fine . . . at many TC aircraft facilities,
20 or 18AWG is used simply for mechanical robustness.
| Quote: | 2) Do I ground the center conducto to a local ground point at the switch
on the panel or do I ground it to the coax outer conductor?
|
Grounding to shield is preferred. See exemplar schematics
in:
http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf
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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lehmans(at)sympatico.ca
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| Posted: Thu Nov 09, 2006 6:12 am Post subject: Slick mag P-lead ground wire |
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Bob,
I have found a certified aircraft with the P-lead shield grounded at the mag
switch end as well as on the mag housing. Is there a down-side (i.e. noise)
to grounding the shield at both ends? (Surprisingly, the Maintenance Manual
for the aircraft does not include wiring for the mag switch or P-lead.)
Mike
| Quote: | 2) Do I ground the center conductor to a local ground point at the switch
on the panel or do I ground it to the coax outer conductor?
|
Grounding to shield is preferred. See exemplar schematics
in:
http://aeroelectric.com/articles/Rev11/AppZ_R11J.pdf
Bob . . .
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nuckollsr(at)cox.net
Guest
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| Posted: Thu Nov 09, 2006 6:42 am Post subject: Slick mag P-lead ground wire |
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At 09:12 AM 11/9/2006 -0500, you wrote:
| Quote: |
Bob,
I have found a certified aircraft with the P-lead shield grounded at the mag
switch end as well as on the mag housing. Is there a down-side (i.e. noise)
to grounding the shield at both ends? (Surprisingly, the Maintenance Manual
for the aircraft does not include wiring for the mag switch or P-lead.)
|
There's a number of discussions for p-lead treatment in
http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf
and
http://www.aeroelectric.com/FAQ/AeroElectric-List/AeroElectric-List_FAQ.pdf
Open the .pdf files and search on "p-lead".
In a nutshell, for best noise reduction -AND- avoidance of
a fabricated ground loop, it's best to ground the shield at
one end only (mag end) and use the shield as the ground return
for the mag switch as illustrated in the z-figures and cited
in the two links above.
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 >
---------------------------------------------------------
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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duawil
Joined: 25 May 2006
Posts: 10
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| Posted: Thu Nov 09, 2006 10:55 am Post subject: Slick mag P-lead ground wire |
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Thanks Bob.
I will ground to the shield this weekend!!!
Duane
| Quote: |
<nuckollsr(at)cox.net>
At 09:12 AM 11/9/2006 -0500, you wrote:
>
> <lehmans(at)sympatico.ca>
>
>Bob,
>
>I have found a certified aircraft with the P-lead shield grounded at the
> mag
>switch end as well as on the mag housing. Is there a down-side (i.e.
> noise)
>to grounding the shield at both ends? (Surprisingly, the Maintenance
> Manual
>for the aircraft does not include wiring for the mag switch or P-lead.)
There's a number of discussions for p-lead treatment in
http://www.aeroelectric.com/articles/MagnetoSwitchOptions.pdf
and
http://www.aeroelectric.com/FAQ/AeroElectric-List/AeroElectric-List_FAQ.pdf
Open the .pdf files and search on "p-lead".
In a nutshell, for best noise reduction -AND- avoidance of
a fabricated ground loop, it's best to ground the shield at
one end only (mag end) and use the shield as the ground return
for the mag switch as illustrated in the z-figures and cited
in the two links above.
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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Building RV10. |
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