10 Meter 4 Element Quad Antenna
N4TUX Boyd’s 10 Meter Quad Antenna
- Reflector Loop Length (4 X L1 side) = 36′ 0″
- Driven Loop Length (4 X L2 side) = 35′ 1″
- Director Loop Length (4 X L3 side) = 34′ 0″ (2 each)
- Reflector: 4 X L1 = 1030 / F (MHz)
- Driven Element: 4 X L2 = 1005 / F (MHz)
- Directors: 4 X L3 = 975 / F (MHz)
Spacing between elements = 10 ft. Elements are centered on a boom.
An rf choke balum is recommended. 8 turns, 8inch diameter of 50 ohm coax placed 1/4 wavelength down from the driven element
Dimensions and project by N4TUX
the elements are somewhat over and undersized the spacing is for best rejection not gain. USe
1009/ F(MHz) for the reflector 1005/ F 995/ F for the additional Directors and ).22 wave length for the Spacing. the need for longer is not justified as the o.22 will yield more than 50 Db rejection side and rear of -40. Widening the spacing to more than 0.22 will drop the gain from 14.5 to 11 Dbd.The audible rejection of less than 1 Db is gained but a loss of 3 db in punch is lost.
its a nicer more robust quad in a storm that one with such lopsided dimensions. IF the Author can get a hold of HY-Gains Super Performing Quad. THE Big Gun II of the 70’s and 80’s s you will see the reason I quote this. This was the Ultimate 4 element beam and Surpassed any 6 El Yagi in every respect. I cut one down for the 11 meter band long before I became a ham. Who needed a Linear when you had this much power without one . I missed a part And I will never know the answer It had Aluminum Spreaders. the second driver was an a few inches longer and for vertical polarization spaced 4 inches in front of the horizontal driver . HY- Gain’s Quoted numbers not moine .