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What is this (on esc wire)?

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What is this (on esc wire)?

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Old 09-21-2012 | 12:14 PM
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Default What is this (on esc wire)?

Got a HW 150A esc and the rx wire is wrapped around this ceramic disk.

Why? Do I need to keep it?

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Old 09-21-2012 | 12:41 PM
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It's a magnet...supposed to help reduce the possibility of interference. I dont know how many people use them now a days though. Used to see them more frequently back in the crystal/brushed motor days
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