[TowerTalk] Measuring resonance of a yagi element

[Ron W8RJL]

Tom,
Remember to get an accurate measure of resonant frequency the element will 
need to be at a height above ground where used. If you measure it at 
stepladder height it will be lower in freq than when up on the tower. I 
guess I am old school but there are many good designs in the antenna 
handbooks by ARRL and W6SAI and others. I realize everything these days is 
computer designed but my old 3 element 26 foot boom 20 meter Yagi built with 
handbook data work pretty darn good. I also interlaced 4 elements for 15 
meters on the same boom. It worked great and all with data from handbooks.
73 and GL on your project.
Ron W8RJL

----- Original Message ----- 
From: "Tom Hellem" <tom.hellem at gmail.com>
To: <towertalk at contesting.com>
Sent: Tuesday, April 21, 2020 6:02 PM
Subject: [TowerTalk] Measuring resonance of a yagi element


>I would like to measure the self-resonant frequency of the reflector on a
> home made 20 meter yagi. It seems obvious the best way would probably be 
> to
> open it up at the center and make it into a split dipole element and hook
> up my analyzer. However I would like to avoid cutting it and dealing with
> splicing it back together again. Can anyone suggest another way to
> accomplish my objective? The reason for doing this is because it is
> apparent from modeling in EZNEC that the
> length of the reflector is critical to the performance parameters of the
> antenna, e.g. gain, F/B, bandwith, etc., and it looks to me like it 
> doesn't
> take much of a change in the length of the element
>
> Thanks in advance for any replies.
>
> Tom K0SN
> Missoula, MT
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