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Author Topic: Feeding a Half Square  (Read 1136 times)
AB7JK
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Posts: 1




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« on: February 22, 2007, 08:39:56 PM »

I'm building a half square antenna for 20 meters fed at an upper corner with RG58.

Question: In feeding the antenna with coax:

One website said: Coax center conductor goes to a verical element and braid goes to horizonal phasing element.

Another website said: Coax center conductor goes to horizontal phasing element and braid goes to a vertical element.

Can someone tell me which is correct? I believe it is the former but I'm not sure. Thanks in advance.

Kim AB7JK
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AB7JK
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« Reply #1 on: February 22, 2007, 09:07:46 PM »

Never mind - I got the answer. Coax center goes to horizontal element.

73s Kim AB7JK
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WB6BYU
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Posts: 13242




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« Reply #2 on: February 23, 2007, 01:45:24 PM »

It really shouldn't matter if the coax is properly decoupled from the
antenna with a balun or choke coil.
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F8DRA
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Posts: 29




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« Reply #3 on: February 27, 2007, 01:18:25 AM »

For that kind of Half Square do we need radials Huh? if yes does each vertical element need its own radials ?
Because some people say that  half square doesn't need radials some say yes they need radials ...... you say the trust Huh??

Does someone know how work a multiband Half square ?

73'

F8DRA, Marc
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N3OX
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« Reply #4 on: March 02, 2007, 07:48:24 PM »

You don't particularly need radials, but a screen of wires on the ground would probably help cut down on near-field induction losses if the element tips are close to the ground.  If the tips are a few meters off the ground, it probably doesn't matter.

Multiband is hard since the spacing has to be different for each band.
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73,
Dan
http://www.n3ox.net

Monkey/silicon cyborg, beeping at rocks since 1995.
F8DRA
Member

Posts: 29




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« Reply #5 on: March 06, 2007, 06:59:33 AM »

Hi Daniel, Thanks for your repply !

Ok on the radials ground system, but do we have to put radials for each monopoles or not ? i've already seen a draw showing a half square with radials for each monopoles Huh
I 've already seen stations who were using Half Square without radial but it 's certainly not the best choice Huh??

I have a 2 elements vertical array on 40M i'm not sure if the result will be better with such an antenna (the Half Square)Huh?

I'd like to thank Kim, i 've just received his Email, i'm going to read it carefully ;-)

73 to all and Good DX

F8DRA, Marc
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