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#3
February 3rd 07, 01:27 AM
posted to rec.radio.amateur.antenna
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LATE MODEL MFJ ROLLER INDUCTOR IS ROUGH
"Bob Miller" wrote in message ... On Wed, 31 Jan 2007 01:59:08 GMT, (Ron in NY) wrote: Hi All, I have a couple of late model MFJ roller inductor antenna tuners with the roller on the inside of the inductor. My old 989C with an external roller was smooth as glass. These newer ones with the roller on the inside of the inductor really are rough. They have a knob with a finger hole, but cannot be spun with 1 finger--you have to grab the entire knob to turn it. I have a 989D with a crank type knob that has a slip clutch as part of the knob, and if you try and turn it real slow, the clutch slips instead od the roller progressing slowly. Has anyone "fixed" this problem with their late model MFJ ??? I fixed mine by just returning the 989D to AES -- they took it back. My old circa 1992 989C is a marvel of precision, in comparison :-) bob k5qwg Last year the roller inductor on my 989C became a little bit dirty and needed extensive cleaning after using it for several years at 1KW. I cleaned it up but it was not easy. MFJ recommended that the only lubrication I should use is pure graphite powder which I found available at the local ACE hardware. It looks like it should be cleaned every year or so. That 989C roller inductor is a work of art and MFJ sells replacements for about $60.00. If I had a 989D I would probably buy a replacement 989C inductor. When I checked other companies for their prices of roller inductors of similar size/inductance/turns, they seemed to go for around $280.00, which probably explains the EC for 989D. |
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