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Author Topic: Inductor Value  (Read 3432 times)
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Mike/W8BAC
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« on: August 28, 2008, 05:12:47 PM »
I would like to know the inductance of a coil. I'm hoping one of you can help.

The inductor is  9.5 turns
                     1/2" OD tube
                     3/8" tube spacing
                     7 7/8" outside diameter coil
                     6 7/8" inside diameter

Thanks in advance for any help.

Mike
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AB2EZ
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« Reply #1 on: August 28, 2008, 06:42:54 PM »
10 uH

ref:

http://hamwaves.com/antennas/inductance.html

D = 187.32 mm ( 7.375 mean diameter center-to-center)

N= 9.5

L=211.14 mm (9.5 turns x .875 inches per turn center-to-center)

D= 12.7 mm (0.5 inch diameter tubing)
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Stewart ("Stu") Personick. Pictured: (from The New Yorker) "Season's Greetings" looks OK to me. Let's run it by the legal department
ka3zlr
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« Reply #2 on: August 28, 2008, 07:26:31 PM »
Add that one to the bookmarks, Thanks Stu....
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Mike/W8BAC
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« Reply #3 on: August 28, 2008, 07:43:18 PM »
Thanks Stu,

Not only do I get the value of this inductor, I find a way to calculate my other inductor. I was hoping for that but never expected it. The AM Fone network ROCKS!

Mike
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Patrick J. / KD5OEI
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« Reply #4 on: September 05, 2008, 12:01:58 AM »
Is there one for calculating a spiral coil? that is a flat coil, I mean.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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« Reply #5 on: September 05, 2008, 10:30:29 AM »
Patrick

These look like they might work for you:

http://www.csgnetwork.com/spiralcoilinduccalc.html

also:

http://smirc.stanford.edu/spiralCalc.html

Best regards
Stu
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Stewart ("Stu") Personick. Pictured: (from The New Yorker) "Season's Greetings" looks OK to me. Let's run it by the legal department
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Patrick J. / KD5OEI
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« Reply #6 on: September 07, 2008, 05:53:34 PM »
Thanks!
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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