[Elmers] Elmers Digest, Vol 17, Issue 1

[Bill-K6ACJ]

Leave the match alone and shorten the driven element by 3mm then test. 

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> On Jul 21, 2020, at 22:00, elmers-request at soara.org wrote:
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> Today's Topics:
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>   1. Hairpin match on an 11 element UHF Yagi (Mike Mahan)
> 
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> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 22 Jul 2020 04:17:13 +0000
> From: Mike Mahan <k6msm at outlook.com>
> To: "elmers at soara.org" <elmers at soara.org>
> Subject: [Elmers] Hairpin match on an 11 element UHF Yagi
> Message-ID:
>    <BY5PR19MB3620A76EAF862A280520631BF2790 at BY5PR19MB3620.namprd19.prod.outlook.com>
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> Content-Type: text/plain; charset="us-ascii"
> 
> Hi all,
> 
> The pictured antenna came with a gamma match, but I didn't have any luck (yet) getting it to work well around 442.5 MHz.  The antenna may have been designed for 432 originally, I suspect.
> 
> I have changed it over to a hairpin match (I hope), but the results are no better so far.  Maybe it's time to cut all the elements shorter by a few mm.
> 
> Or maybe I need more insulation between the 2 sides of the driven element or more spacing, etc.
> 
> I haven't found a hairpin calculator to see if the one I made is too big (or too small).  What is a good way to find out?
> 
> And if it helps, this is the UHF antenna I bought from SOARA from Hal's estate.
> 
> Thanks all for any suggestions.
> 
> 73,
> 
> Mike
> K6MSM
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> End of Elmers Digest, Vol 17, Issue 1
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