[VHFcontesting] Conversion from 3/16" to 1/4" elements on VHF Yagi

[George Sintchak]

If you make the change to 1/4 in elements you will also have to change the 
deldrin(?) feedthru insulators and also use different "keepers" for the 
elements.
Why don't you contact M2 and get their take on what you have to do to make 
the changes.

GL & 73's
George WA2VNV.


----- Original Message ----- 
From: "Byron Tatum" <bjtatum1 at att.net>
To: "VHF Contesting Reflector" <vhfcontesting at contesting.com>
Sent: Monday, May 20, 2019 12:15 PM
Subject: [VHFcontesting] Conversion from 3/16" to 1/4" elements on VHF Yagi


>A quick question to the antenna modeling gurus here - I am preparing to 
>clean-up and rebuild some 144 Mhz M2 2M12 yagis. I have recently relocated 
>to a more rural QTH and am concerned about larger birds getting on my 
>yagis. The towers are in the 130' height range. I am studying changing out 
>my parasitic elements from 3/16" to 1/4" rod. I plan to use the correction 
>as detailed in the ARRL Antenna Handbook 22nd edition for the K1FO/DL6WU 
>high performance 144 Mhz yagis section 15.3.5 page 15-27. Since 1/4" rod 
>parasitic elements are used in the 144 Mhz designs it is stated that the 
>element lengths need to be lengthened by 3mm if 3/16" elements are 
>substituted. So, my thinking is to replace my 3/16" parasitic elements with 
>1/4" ones that are 3mm shorter in length. As far as my knowledge goes I 
>should not be detrimentally affecting the antenna (electrically) in any 
>way, but I thought I would ask. Thanks, Byron W5FH
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