Re: [amsat-bb] W0LMD test results

["Frederick M. Spinner" <fspinner@xxxxxxxxxxx>]

Actually, on retrospect, I now understand the 2db comment.. I still think it 
might be further optimized by tuning for resonance as well.  But I take it 
you meant the other patches showed a 10-20dB cross pol loss and "circular" 
one only showed 2dB.

Fred W0FMS



>From: "William Leijenaar" <pe1rah@hotmail.com>
>To: amsat-bb@AMSAT.Org
>Subject: [amsat-bb] W0LMD test results
>Date: Thu, 26 Jun 2003 22:43:31 +0200
>
>Hi AMSATs,
>
>I see that I made some kind of "sandstorm" after I posted the message about 
>my test results of the previous patch haha. I am very supprised that nobody 
>else has descouvered that before, or made any notice of it.
>
>Last week I was a little busy with qrl things. I have looked for the W0LMD 
>patch information but like posted by some other amateurs I could not find 
>any detailed information.
>Today I see some message posted with some links and I downloaded the 
>drawings and after conversion to milimeters, and finding the materials I 
>made the patch like drawn :-)
>
>The patch is much better than the square patch. It is mechanical stable and 
>also more circulair :-)
>Today I did some quick circularity tests and the best results I got is a 
>2dB difference. The test was done with the patch in my hand and rotate it, 
>so not very optimal, but still much much better !!!!
>
>There is only one thing I can not find out. What is the polarisation of 
>this patch ????
>I guess its LCHP, because its designed as feed in front of a dish, but what 
>will be a RHCP design ???
>(The same confussion has been with the "square, none circulair" patch... )
>
>Does anybody know the principle of creating circularity behind this design 
>???
>Why this tuning bold is 0,5" from the feed point ??? (I would more think of 
>90 degrees to feed point)
>
>Tommorow I will wake up early and will compaire my old patch with this new 
>patch...
>Then I will find out if this design is worth its glory .-)
>
>73 de PE1RAH, William
>---
>
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