[Elmers] Elmers Digest, Vol 17, Issue 2

[Bill-K6ACJ]

Matching systems are applied for different reasons such as matching a low impedance or a high impedance to the 52 ohm feed line and Factory designed matching networks are hard to improve on.   

Once you shorten the feed element to raise the frequency then shorten each element an equal amount.  Both the reflector and first director length affect SWR so GO SLOW with the hacksaw blade.   Lengthening an element is easy by taping a 4-40 screw into the end or crimping a sleeve over the end.    Bill K6ACJ   .

Sent from my iPad

> On Jul 22, 2020, at 12:00 PM, elmers-request at soara.org wrote:
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>   1. Re: Elmers Digest, Vol 17, Issue 1 (Bill-K6ACJ)
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> Message: 1
> Date: Wed, 22 Jul 2020 10:57:14 -0700
> From: Bill-K6ACJ <k6acj at biztek.com>
> To: elmers at soara.org
> Subject: Re: [Elmers] Elmers Digest, Vol 17, Issue 1
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> Leave the match alone and shorten the driven element by 3mm then test. 
> 
> Sent from my iPhone
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>> On Jul 21, 2020, at 22:00, elmers-request at soara.org wrote:
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>> or, via email, send a message with subject or body 'help' to
>>   elmers-request at soara.org
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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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>> 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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