Author Topic: Magneto Shielding  (Read 290 times)

eschrom

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Magneto Shielding
« on: Nov 25, 2017 »
Hi Gang,

Can someone tell me the right way to shield magneto wires? I'm trying to eliminate radio static and I know the mag is the problem because the static disappears when I shut it off.

Thx,
Ed

Soneraifred

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Re: Magneto Shielding
« Reply #1 on: Nov 25, 2017 »
Hi Ed:
I did that a couple years ago.  Use 20AWG shielded wire.  Connect the center wire to the mag p-lead connection and one terminal of the mag switch.  Connect the shield wire to the other terminal of the mag switch and the ground terminal on the mag.  I found some good shielded wire fabrication instructions online.
Fred Keip
Owner-SoneraiWorks LLC
Sonerai Newsletter Editor-Retired
Sonerai IIL, N99FK

eschrom

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Re: Magneto Shielding
« Reply #2 on: Nov 25, 2017 »
Thanks, Fred. Just to be clear...

Right now the cockpit switch is connected to the p-lead on one terminal and airframe ground on the other, and the shield at that end is also connected to ground. You're saying connect the shield directly to the switch terminal and use no other ground connection in the cockpit? I believe my wire is 18AWG - is that close enough?

Thx,
Ed

Soneraifred

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Re: Magneto Shielding
« Reply #3 on: Nov 25, 2017 »
Correct.  There is no need for the airframe ground.  When connected as  I described, the p-lead is connected directly to the magneto ground when the mag switch is closed. 18 gauge wire is OK.
Fred Keip
Owner-SoneraiWorks LLC
Sonerai Newsletter Editor-Retired
Sonerai IIL, N99FK

eschrom

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Re: Magneto Shielding
« Reply #4 on: Nov 26, 2017 »
Thanks, Fred. I'll try it on the next flyable weekend.

Ed

 

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