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On Dec 3, 2023, at 10:41 AM, Gary Sitton via BVARC <[email protected]> wrote:
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Regarding recent conversations on 5/8 wave vertical antennas:
https://vk2zoi.com/flower-pots/<https://urldefense.com/v3/__https://vk2zoi.com/flower-pots/__;!!Om87Lau1Cg!NBM_jXuw_ZG3Iy7EeJSsBhHEmgTfK3E2pe4fdS7DiOg4puTlYKqgrnkOtFYaOfz6WDQCT6SwrmajFQ$>
Open this website with a browser and open one of the articles
on "Double 5/8 Flower Pot" verticals. This 5/8 wave vertical dipole
may be constructed using some RG-59 coax and a bit of soldering.
The antenna uses the coax itself to form 1/4 wave sleeve transformers
to convert the dipole's 100 ohm feed point to 50 ohms. The coil of
RG-59 is used to choke off the sneak RF path on the outer portion of
the coax. It takes a bit of thought to understand this system but it
actually works well. The entire antenna should be covered using a
1" section of PVC as shown else the SWR will rise when it gets wet.
I have implemented the simpler 1/2 wave "Flower Pot" vertical using
RG-8X coax for my 2 mtr. base station antenna. I currently use a QRO
1/2 wave vertical dipole on 20 mtrs. using the same principle.
73,
Gary Sitton, K5AMH
[email protected]<mailto:[email protected]>
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