|2 METER 4 ELEMENT QUAD BEAM|
10 db GAIN and LESS THAN 4 FEET
APPROX COST: $20 PVC & $20 COAX AND CONNECTOR
|1" and ˝" Crosses must be perpendicular to each other, they may appear parallel in the drawings, that was for simplicity. The ‘cutaway detail’ shows the positions of the 5 cross stubs, they are not seen when it is all assembled. The boom is all 1" and the spans are all ˝". Take your time, PVC glue gives you lots of time.. NOT! (LOL)|
|Drill 1/8" holes 1" from the end of each span, you choose whether you drill before or after gluing. I used a jig for the holes, plans available for $49 (It’s a 2" square piece of tin with a 1/8" hole in it’s center that I wrapped around the span, I’ll sell you one of those for $49 too). The passive elements are done as in the ‘loop detail’ drawing at right (three total).|
|The active element (driven) is a little trickier. Side feed will render vertical polarization (which I used since planning to hit a vertical repeater antenna from a distance, and bottom feed will render horizontal polarization (best for simplex between two beams). This was my solution, feel free if you think you can improve it.|
Once you have cut all the pieces and are ready to glue, remember adequate ventilation! ("WOW man, look at all the pretty colors")
I just wire tied the coax to the mast and across the span, feed it up the inside of the pipe if you want to get fancy. I cut the coax to multiples of the wavelength, I’ve always done this and things turn out happier. I tune whips by coax length and am testing lengths for the beam as we speak. I also drilled small holes in the bottom span caps to leak any rain that might follow the wires into the holes.
If you prefer I will cut, glue, and assemble one each said antenna for the resonable price of $60 Plus shipping and coax
|˝" PIPE CUTS|
|1" PIPE CUTS|
Designed, built, and tested by KC0CHL.
Testing assistant KC0EIN.
For information e-mail KC0CHL
A great tool for quad designers I found after I built this one
CUBICAL QUAD ANTENNA CALCULATOR
History of the Cubical Quad Antenna