 The article mentioned that the “Franklin” antenna is unbalanced type and a Balun is required for proper impedance (I can tell it is unbalanced as the other element is connected to the ground shielding), my idea to make a balun is to use a L1/4 of 50 Ohms coax and tapped it at the feed point, my first candidate was the RG213, after cutting it to the size I need, I bent it but the damn thing is too hard as the wire and the shield is too thick! and instead of fighting with it, I decided to use the RG58U, This time I use different approach, instead of using a 1/2L for its size, I read in an article about balun making and it was suggested that the velocity factor must be added to the wavelength size, the velocity factor of RG58 is 0.66, so after doing the math I come up with a size of 40.5 |
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Formula for size adjustment Length = L1/2 x VF ( 61.5mm x 0.66 = 40.59) After I made a 40.5mm of RG58 it is still hard to bend it because of the outer shield, I solder it at the feed point and this is what it looked like. |
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 I am not satisfied with the result of it and the way it looks, it is untidy and it looks like it will not last, I redo the balun again, this time I cut a 50 mm of RG58 and then I remove the outer shield, I trimmed the braid shield to a size of 40.5mm and then centred it, I wrapped the braided shield’s both end with a solid wire that I took from a Cat-5 cable. I slipped a shrink tubing and solder both end until the whole solid wire is covered with lead. |
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November 28th, 2005 at 14:34
Wow! very impressive.
I’ve build several antenna for wifi but have never found a design for a sector before.
I look forward to you long distance results.
Dan
November 29th, 2005 at 17:59
Got the idea, I am building a sector antenna based on your design, but will be using a different radiating element.
January 14th, 2006 at 16:42
I too live in Saudi Arabia, Rabigh is home for me, Facing the same problem, need 150 metes of WIFI coverage. Any help or joined support, would be great.
Regards
Lamar
April 12th, 2006 at 23:42
What is the dimension of center element copper wire.
May 9th, 2006 at 16:31
What are the dimensions of center element.
May 23rd, 2006 at 13:25
Great job guys… Thank for you work…
June 11th, 2006 at 17:35
Perhaps you should put a link to the original design ?
http://www.qsl.net/yu1aw/vhf_ant.htm
June 15th, 2006 at 1:03
@foobar
what makes you think that the link you provided is the original design? are you aware that the 4NEC2 has a template for that particular design? are you also aware that i have the pdf documents the chap did mentioned? he clearly states how he did his and none of your so called “orginal design” has the same dimemsion he used, although it has the same design look. That doesn’t mean he copied it or got the idea from your so called “original” design.
incase you are not familiar with the things i mentioned, STFU.!
give the chap some credit.
June 25th, 2006 at 6:26
Great.
Can we increase the gain by increasing the number of elements.
July 17th, 2006 at 20:53
My first project was a radio telescope 10 years ago, now I would like to build something that is
VERY directional and can send and recieve to and from wifi devices with a range of over 2km
what type of antenna is required I would rather build the thing myself if possible
Please help
August 14th, 2006 at 16:29
Did yoy see amos 9 sector antenna? http://www.qsl.net/yu1aw/vhf_ant.htm Ithink it is a good antenna, i have made one and it works better than pacific wireless SA24-90-17 antenna, and i did not make it with perfect reflector. If some one try to make one i have interesting solutions for easyer making, contact me one zoran.s@verat.net.
August 19th, 2006 at 12:15
I am going to build it soon and let gives u the result