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14SE058
Newbie (0-25)
Joined: 26 May 2007
Posts: 17
Karma: +7 (7)
SE$ 2.00
Location: Toulouse
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 Posted: Wed Aug 15, 2007 4:33 pm Post subject: Cubical Quad 4 éléments - 11 Meters |
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A Cubical Quad is one of the best Antenna for DX'ing because she takes less QRM and the gain of a loop is one of the best, if you are able to do a loop antenna with perfects circles you would have the best antenna for DX.
(So contact me  )...
I purpose you a plan for building your proper quad 4 elements which is better than a Yagi really an easy to build DX system:
http://www.fast-files.com/getfile.aspx?file=13057
Center Frequency: 27.500 MHZ
Bandwidth: 600 Khz without Matching box
SWR= 1
15 DBi Gain ! !
Length of each elements:
"A" = 11,16 Meters
"B" = 11,00 Meters
"C" = 10,20 Meters
"D" = 10,32 Meters
Length between "H" and "I" = 1.95 Meters
Length between "J" and "K" = 1.92 Meters
Length between "L" and "M" = 1.78 Meters
Length between "N" and "O" = 1.80 Meters
The Boom length in total = 5 Meters
length "E" between Element A and B = 1.66 Meters
length "F" between Element B and C = 1.31 Meters
length "G" between Element C and D = 1.31 Meters
You can feed the B element directly with 50 Ohms Coaxial.
You needn't any balun or matching system...
The plan was in French and I've tried to translate it, so if you need more details give me a call or send me an email.
All additive technical data are welcome...
GOOD DX
_________________
DX and FUN the good way !
14FDX058-14SE058
John |
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43SE144
Site Admin
Joined: 06 Apr 2007
Posts: 496
Karma: +1 (1)
SE$ 207.50
Location: Pee Wee Hill, In The Upper Hunter Valley Somewhere, NSW, Australia
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43SE155
Newbie (0-25)
Joined: 09 May 2008
Posts: 15
Karma: +2 (2)
SE$ 9.50
Location: North Queensland
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| Posted: Fri May 09, 2008 6:42 am Post subject: My Old 4 element Quad from the late 70's |
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| I just found I still have all the bits and pieces including the hubs for my 4 element cubical quad, that I built with the help of a mate in probably '79. All in good condition waiting to be used, so if the wife permits, it is going up again. I may have to put it way down the back yard but any attenuation on long coax at 11 metres won't be too much of a price to pay. Photos when I get it set up. |
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43SE155
Newbie (0-25)
Joined: 09 May 2008
Posts: 15
Karma: +2 (2)
SE$ 9.50
Location: North Queensland
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| Posted: Mon Oct 20, 2008 10:49 am Post subject: 30 Year Old Quad Restored |
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As mentioned above, I began restoring the quad I built in '79.Since I now have an amateur radio licence, I am altering it to be a tri-bander 15/11/10m This won't be too difficult, as the spiders angle such that the spacing changes as the elements get longer. It won't be perfect for frequencies other than 11 meters, but it will be pretty close. The photos only show one hub (two elements), but the quad is 4 elements.
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