Base Fabrication Question

[TheRATT]

Also I have a friend who is a contractor for Boeing and he has a CNC machine and access to aluminum and titanium. I have read about 102” stainless whips being used as an inverted V (dipole?)

What materials would be proper to create a mount and what angle should I make them on the downward? I can’t remember who posted the name of a now-defunct model.

Alternatively, if I were to create a mount with 102” vertical and 102” ground planes - how many would one need on the horizontal? 3? 4? 1,000??

 

[Redbeard U812]

I think I used 22 deg for my Omni. Three GP with 5% increase in length 108" + 5%. My GP are scrap aluminum tubing. Have a 102" with HD spring equaling about 108" +/-. Hope that helps. I'm sure someone with more experience can lend a hand.

 

[357magnum]

Marconi , ??? Stay Healthy & Safe ! 73 & God Bless , Leo

 

[BJ radionut]

 

[BJ radionut]

https://sites.google.com/site/rio4br/Home/dipole

 

[2NC995]

What materials would be proper to create a mount and what angle should I make them on the downward?

Aluminum should work great. I don't think there's a particular angle that's required. I have mine in a wide V, probably 120 degrees or so, and I'm happy with it.

Alternatively, if I were to create a mount with 102” vertical and 102” ground planes - how many would one need on the horizontal? 3? 4? 1,000??

I believe its been said that after 4 there's no real benefit. Somewhere in the 45 degree range will get you close to 50 ohms.

 

[Redbeard U812]

Had to dig this out, was on thumb drive, and had to find it. Don't keep much on drive C.

Reflections by Maxwell.

I'm sure others will cite ARRL, so here that is #19.

 

[kopcicle]

not exactly 1/4 wave but ...

 

[Redbeard U812]

View attachment 36193 View attachment 36194
not exactly 1/4 wave but ...

Is that quartz rock effective? Does it equalize the isotopes?

 

[kopcicle]

Actually a stump that got a hole bored in it

 

[Redbeard U812]

Actually a stump that got a hole bored in it

Oh gosh......I need better glasses, I thought that was a neat quartz rock placed out there by the antenna as decoration.

 

[kopcicle]

The black box is a SGC SG-230 auto tuner.

 

[2NC995]

Oh gosh......I need better glasses, I thought that was a neat quartz rock placed out there by the antenna as decoration.

When you said rock it looked like a rock. Now it looks like a stump with a hole in it

 

[Redbeard U812]

Being in Kop's backyard, it could be petrified from the time before dirt.

 

[Handy Andy]

So they planted the Tree when Kopcicle was born, it grew, weathered storm after storm after storm, then died of old age, and the only thing left was Kop...

Whom when seeing that the Tree was gone and all that was left was the stump, it's life was then celebrated by planning a more permanent Metal replacement and called it a Ground Plane ..which on occasion serves as a Radiator for other Non-essential bands...


Have I got that right?