[MLB-WIRELESS] RE: [amsat-bb] Helix Construction

[Tony Langdon, VK3JED]

Looks like Jason's getting attention beyond wireless networking. :-)

This was found on an amateur satellite mailing list... :-)

At 01:46 AM 9/03/2002 +0100, Andre PE1OIG wrote:

>Hi Jesse,
>
>Check out http://users.bigpond.net.au/jhecker/ and look for the link
>to the HelixCalc program. Here you can calculate the desired helix
>antenna and can print the "PVC wrap-around paper" you're looking for.
>
>Good luck!
>
>73 de Andre PE1OIG.
>------------------------------------
>Andre Theelen   PE1OIG   QTH: JO20WX
>e:pe1oig at pe1oig.net w:www.pe1oig.net
>
>
>-----Original Message-----
>From: owner-AMSAT-BB at AMSAT.Org [mailto:owner-AMSAT-BB at AMSAT.Org]On
>Behalf Of Jesse Morris
>Sent: Saturday, March 09, 2002 0:24
>To: amsat-bb at AMSAT.Org
>Subject: [amsat-bb] Helix Construction
>
>
>Good Evening to All,
>
>Last year when I was working on a helix antenna for AO-40 I picked up a
>nifty idea on the web for a method of  accurately maintaining the spacing
>and pitch of the antenna when wound on a piece of 1 inch PVC.  It
>involved preparing a plain piece of paper with a series of boxes on it.
>The X axis (vertical lines) corresponded to the circumference of the PVC
>and the Y axis (horizontal lines) corresponded to the winding spacing.
>Drawing a diagonal line from one corner of each box to the other
>corresponds to the pitch.  (Depending on which way the diagonal runs it
>works for RH or LH.)  If you warp the piece of paper around the PVC you
>have a perfect pattern for winding the helix. I think it was originally
>done with a CAD program but it could really be done by hand.  I can't
>describe the process nearly as well as the originator but a disk crash
>some time back caused me to loose the original message so I don't know
>the source of the idea.  I think it was from one our friends "down under"
>but I'm now sure.  I would like to recover the ID of the originator so I
>could give proper credit with I pass the idea along.  If anyone knows the
>originator of the idea I would appreciate the info.
>
>Thanks and sorry for the BW.
>
>73's de Jess - W4MVB
>----
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>----
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>
>
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73 de Tony, VK3JED
http://vk3jed.vk.irlp.net