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Author Topic: Building a loading coil  (Read 878 times)
AB1PJ
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Posts: 33




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« on: May 01, 2013, 10:56:34 AM »

I would like to build a loading coil
Where may i find materials for it online?

I need the loading coil wire : lacquered 1.5mm winding wire
I also need a very light weight cylindrical isolator on which the coil will be wound.

Basically want o build a 42mm loading coil

thanks
jim
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K3VAT
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Posts: 699




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« Reply #1 on: May 01, 2013, 11:45:38 AM »

Jim,

Here's one link with tons of information that is a must-read for coil builders.  Keep scrolling down for more and more goodies about the theory of coil inductance, building techniques, links, etc.

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

For specific answers to you questions, it would be helpful for us to know what you have in mind as far as the antenna such as the band of operation, power, antenna system characteristics, etc.  May be this is for a wire antenna hung between supports as you'd like light weight.

Perhaps 1.5mm winding wire isn't the best approach; coil factor typology, wire spacing, # of turns are important and should be optimized based on the above.

GL, 73, Rich, K3VAT
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AB1PJ
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Posts: 33




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« Reply #2 on: May 02, 2013, 11:52:50 AM »

I am trying to build a 40m shortened hexbeam, as shown here: http://members.home.nl/pc4u/Information.html
jim
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N3QE
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Posts: 2029




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« Reply #3 on: May 02, 2013, 12:16:51 PM »

I need the loading coil wire : lacquered 1.5mm winding wire
I also need a very light weight cylindrical isolator on which the coil will be wound.
Basically want o build a 42mm loading coil

Translating:

"1.55mm lacquered wire" is euro-talk for 14 gauge or 15 gauge magnet wire. 14 gauge plastic-coated electrical wiring (ala hardware store or home depot) will be really close.

A common "light weight cylindrical isolator" is PVC pipe.

"42mm" is Euro-talk for the outside diameter of 1.25 inch PVC pipe. (Which is not, of course, actually 1.25 inches in any actual dimension!) Again, hardware store or home depot.

I commonly use nylon wire ties to help hold the windings in place on PVC coil forms.

Want to hear my new Home Depot joke? The Pope goes to Home Depot and says he wants to buy a two-by-four. The clerk asks him "How long do you need it?". The Pope replies "For all eternity".

Tim.
« Last Edit: May 02, 2013, 12:23:21 PM by N3QE » Logged
AB1PJ
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Posts: 33




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« Reply #4 on: May 02, 2013, 12:38:21 PM »

That's great !

But why is 42mm = 1.25inch?
Shouldn't it be 1.65" (42mm / 25.4=1.65")
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N3QE
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Posts: 2029




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« Reply #5 on: May 02, 2013, 12:43:12 PM »

That's great !

But why is 42mm = 1.25inch?
Shouldn't it be 1.65" (42mm / 25.4=1.65")

42mm is indeed 1.65 inches.

And the outside diameter of 1.25 inch PVC pipe is 1.65 inches. Go check it out at the hardware store :-)

Or at http://en.wikipedia.org/wiki/Nominal_Pipe_Size

Tim.
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AB1PJ
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Posts: 33




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« Reply #6 on: May 03, 2013, 05:52:39 PM »

Ok, that makes sense, you are right.

On a different note, what is a 1.5mm.sq HO7V-R antenna wire?
Is there an american equivalent to it - AWG and brand/type perhaps?

thanks
jim
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