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Author Topic: Shunt Coil, Inductance Coil, Matching Coil  (Read 2429 times)
K5LDL
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Posts: 56




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« on: April 20, 2012, 12:50:13 PM »

Hello again!

While contemplating my inductive matching coil set ups for my 2 vehicles and their respective antennas, a Sierra Sidekick and a Bug Catcher, and exploring the Net for ideas and answers, I came across a few commercial sites that sell ready made induction coil matching units.  Some are bare enamel wire, others are housed in PVC caps, some are wrapped around a PVC mold and covered in epoxy or some silicone goop, and some are housed in gray PVC electrical boxes.  While some folks use only one coil to work 40 and 80 meters,  I came across a manufacturer, whose name eludes me now, who markets a gray PVC box with two coils inside of it.  It fascinated me, however I didn't bookmark the site nor can I remember its name!

What I wanted to see more than anything is how the coils were connected inside the box and thus how it was mounted and connected to the antenna.  Also, would there be any interaction between the two coils as one uses 40m or 80m.

If anyone knows of this manufacturer or the answers to my questions, please enlighten me!  I will cross post in Antennas Forum as well.

As always, 73!

Luis K5LDL ex KD5KJD
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K0BG
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Posts: 9879


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« Reply #1 on: April 20, 2012, 04:55:18 PM »

Save yourself a lot of frustration, and pay a visit to my web site.
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K5LDL
Member

Posts: 56




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« Reply #2 on: April 21, 2012, 06:06:59 PM »

Alan!

My one single coil is based on your advice!  My question was in reference to a site that showed two coils in an enclosure.  One for 40 and 80, the other 160?  Anyway, my interest lay in whether the coils were in parallel or in series and their proximity to each other.

Luis K5LDL ex KD5KJD
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N5MOA
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Posts: 1053




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« Reply #3 on: April 21, 2012, 08:05:45 PM »

The only thing I found via google for dual shunt coils was in the "mobile install photos" on Scorpions website.

It is also referenced as being included with their 160m version antenna. One coil for 160, one for 80 and up. Might give them a call.

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WV4L
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Posts: 141


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« Reply #4 on: April 22, 2012, 11:20:58 AM »

Greetings Luis,

The only link I could find in my arsenal that resembled your description was a shunt by REP Design  http://www.repdesign.us/gpage18.html
but it is not a dual shunt. Perhaps you could use two and install a relay to switch between them?


Hope this helps!

73

Wayne C.
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K5LDL
Member

Posts: 56




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« Reply #5 on: April 23, 2012, 03:55:34 PM »

Tom!

You win!  Hi hi!  I've spent the past three weeks racking my brain trying to remember where I saw that dual coil!!  And yes it a coil for 10-80 and another for 160.  Interesting box they have going.  Thing is, I never could find any documentation on it.  Just as well as my Breedlove mount came in today and I have a mobile ham antenna to install!  I will be running an old High Sierra Sidekick I picked up at a hamfest.  It found a new home with me and I repaired it and fixed it all up almost as good as new! 

I want to thank all who helped in my search for this thing thus allowing me to keep my sanity intact... as if!  Hi hi!

73!

Luis K5LDL ex KD5KJD
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