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Author Topic: Inductive Matching Coil for Screwdriver  (Read 1501 times)
VE3XKD
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Posts: 51




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« on: May 25, 2011, 04:10:25 PM »

Ho

I've been HF mobile from my 04 Prius for a few years now and enjoy it tremendously. Here's my problem. I roof mounted my Screwdriver antenna and have discovered that the hand-wound matching coil is  getting buffetted by the wind, and, over time, the coil either breaks free or stretches and goes out of match. Anyone have any ideas about more mechanically solid options?

73

VE3XKD
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KC7YRA
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Posts: 256




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« Reply #1 on: May 25, 2011, 09:40:02 PM »

I just recently built a new shunt coil for my antenna since I had to mount it on another truck.  I ended up using 4ga solid copper. 

It certainly won't "reshape" itself without some serious help.

Brad
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VA3MW
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Posts: 13




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« Reply #2 on: May 26, 2011, 07:36:37 AM »

I made mine out of 8 turns of 14G enameled wire.  It doesn't move at all.

mike va3mw
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K0BG
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« Reply #3 on: May 26, 2011, 01:57:48 PM »

John, I have some hard drawn #12 that won't stretch in the wind, period! Say the word, and I'll mail you up some.
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VE3XKD
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Posts: 51




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« Reply #4 on: May 28, 2011, 03:40:20 AM »

Alan

Thanks very much for the offer. Once I realized what was needed I found something locally. The bands have been terrific lately up here in the "Great White North". Cheers

John
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K0BG
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« Reply #5 on: May 28, 2011, 07:01:40 AM »

On my way back from Dayton, 6 meters was alive, and well! Sure nice to hear more than just one area of the country for a change.
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W5LZ
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Posts: 477




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« Reply #6 on: May 31, 2011, 12:02:24 AM »

Something you might try if you feel like it is to encapsulate it some way.  Two end caps for PVC pipe, small plastic medicine bottle?  Or as suggested, just a heavier wire.
Paul
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