| Author |
Message |
    
ryan
| | Posted on Thursday, February 06, 2003 - 11:50 pm: | 
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has anyone tried building one? i got plenty of space and will try it out if the matching is not too hard. ill tie it up with nylon rope |
de
| | Posted on Friday, February 07, 2003 - 8:07 am: |
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If you want to make the truly awsome antenna and you have the space you might build a Resonant Rhombic Antenna.
Put 'Rhombic Antenna' in your search engine and you will fine a description. The details are too long to place here.
Or you can find it in the ARRL Antenna Book, and the ARRL Handbooks.
The Resonant Rhombic is the height, the king, of the wire anennas.
DE |
ryan
| | Posted on Friday, February 07, 2003 - 10:56 am: |
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yeah, but i didnt ask for a wire antenna. im looking for something vertical with a lot of nut to it. im curious as to whether or not a bigazz vertical like this would work and how well |
bullet
| | Posted on Friday, February 07, 2003 - 1:46 pm: |
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5/8th produces the best gain when you go over that it becomes multi lobed and gain suffers.
as a rule for normal verticals |
bruce
| | Posted on Friday, February 07, 2003 - 2:31 pm: |
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ryan not as well as a 5/8 wave |
CM 3885
| | Posted on Friday, February 07, 2003 - 2:32 pm: |
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what you want is a CB verticle rignt not a ham? The old Avanti sigma 4 was a 7/8 wave. You can still get a remake of it if you check around. |
Mr_Rf
| | Posted on Friday, February 07, 2003 - 10:58 pm: |
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I thought the sigma was a 5/8wl?
7/8wl = 30ft.
5/8wl = 22ft
Anyway, if you have the space...an outstanding vertical array with healthy gain at lower freq.'s such at CB is Qty(4) phased 5/8wl verticals for just under 6.5dBi of real gain (omni) and 9 dBi directional phased.
This is the trick of big gun AM broadcast stations. The phasing can be shifted and create a directional pattern with a little relay work. This is similiar to the old "super scanner" antenna theory except they used 1/2wl dipoles and less than optinum spacing making for a comprimised gain.
Good Luck |
bruce
| | Posted on Saturday, February 08, 2003 - 7:36 am: |
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Your right works like a champ but takes some doing! |
ryan
| | Posted on Saturday, February 08, 2003 - 1:56 pm: |
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what about 3/4 wave antennas. i hear they work even better than 5/8~. and its direct connect from what ive read |
CM 3885
| | Posted on Saturday, February 08, 2003 - 4:36 pm: |
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my 7/8 wave sigma 4 talks better than my other base antennas ive had and thats what matters... |
joker
| | Posted on Saturday, February 08, 2003 - 5:25 pm: |
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that sigma iv is a 3/4 wave antennae i have one & it works great |
Rob_Usa
| | Posted on Saturday, February 08, 2003 - 7:13 pm: |
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Do a search on a J-Pole. You will find the formulas and all the info you need. I built one a few weeks ago and it out-performed my Imax. Read the thread I started "J-pole outperformed my Imax 2000". If you're wanting something that works great and have to build yourself, you won't go wrong with this one. |
