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Author Topic: Cleaning a roller inductor  (Read 831 times)
AG4CT
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Posts: 4




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« on: April 20, 2001, 07:53:26 PM »

Recently purchased a used MFJ 989C and the roller inductor is slightly noisy.  What is the best product(s) to clean it with?  I thought there was a post on this before, but could not find it.  The tuner works great otherwise, tunes my G5RV 1:1 except on 160, where it is 1.7:1.  It handles my Ameritron AL-84 just fine so far.

Steve AG4CT
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AC5UP
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Posts: 3866




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« Reply #1 on: April 21, 2001, 09:15:30 AM »

I don't claim this is the best available, but WD-40 does a dandy job of loosening oxidation from plated contacts. Wet a Q-Tip with a short squirt and have at it...
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G4HZV
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Posts: 102




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« Reply #2 on: April 22, 2001, 03:28:20 AM »

I presume the MFJ is a wheel contact, not a scraper. If you're ever looking for a roller coaster at a flea market, go for the rubbing contact ones, because they are self cleaning.

I've had similar contact problems with wheel roller coasters. Get some alcohol or switch cleaner on a small piece of rag and hold it firmly on the inductor as you rotate it. The rag will be black when you finish, so you might need a few treatments. It's amazing how messy and greasy these things become. Give the wheel and end contacts a good dose of switch cleaner and it should be fine.
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K3UOD
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Posts: 145




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« Reply #3 on: April 25, 2001, 03:18:22 PM »

I use alcohol on a pipe cleaner to clean the groove in the contact wheel.
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