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Short Data of the DK7ZB-Quadlong Gain 6,5 dBd, F/B 18,5 dB 3-dB-angle hor. = 72°, 3-dB-angle ver. = 70°
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| Theory of the Quadlongs | 4/6-m-Quadlongs | 2-m-Quadlong | 2-m-4x-Quadlong | 2-m-4x-Oblong | The Hentenna (2 m, 4m, 6 m) |
The 144-MHz-DK7ZB-Quadlong and Double-Quadlong
New Double-Quadlong see down!
The 2-m-Quadlong was designed for 144,3 MHz to use it for horizontal polarisation in the CW/SSB-modes.
Stacked versions see below!
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Short Data of the DK7ZB-Quadlong Gain 6,5 dBd, F/B 18,5 dB 3-dB-angle hor. = 72°, 3-dB-angle ver. = 70°
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Picture right: Scheme of the Quadlong
Impedance 28 Ω , feeding with the DK7ZB-Match Dimensions for the 144-MHz-Quadlong: Distance Loop-Reflector = 300mm
Important: All lengths given from center to center! Lengths in the table below.
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2x 28-Ohm-Quadlong stacked Built by Gunter, DL2DRG |
| Diameter Loop rods | Length ver | Length hor | Length Reflector |
| 4mm | 782 mm | 314 mm | 1030mm (8mm) |
| 5 mm | 785 mm | 314 mm | 1034 mm (5 mm) |
| 6 mm | 787 mm | 314 mm | 1033 mm (8 mm) |
| 10 mm | 797 mm | 314 mm | 1034 mm (10 mm) |
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The stacked Version with the 25-Ω-Quadlong
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For the stacked version the impedance of the single Quadlong was changed to 25 Ω at XX because with that impedance a clever stacking is possible. With two lengths L of 50-Ω-coax 3/4- λ* V (with full-PE 2 x 103,5 cm) we have an impedance transformation to 100 Ω at XX. With both cables parallel we get 50 Ω at XX. The first 45 cm of the cable starting at XX is wound to a coax-choke for balanced feeding of the loop. The distance between the two antennas (parts 3 and 10) is 110 cm. This feeding is described at the 2x25-Ω-Yagis stacked (Lightweight-Yagis). |
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Gain 9,6 dBd F/B 21 dB 3-dB-angle hor. = 72,2° 3-dB-angle ver. = 30,0° The gain is 9,6 dBd with excellent radiation patterns. The 9,83 dBd in the right plots are without the stacking losses. Lengths (6-mm-elements): Hor. (3, 4, 9, 10) = 298 mm Ver. (1, 2, 7, 8) = 806 mm Reflectors 1029 mm, 8-mm-Diameter Distance Ref-Loop 295 mm |
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The 144-MHz-DK7ZB-Double-Quadlong
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The Quadlong can be built up with a double frame. The gain increases only 1 dB, but this antenna has a greater bandwidth than the single Quadlong. Feeding with the DK7ZB-choke, the same as for the Quadlong. |
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Data of the DK7ZB-Double-Quadlong: Impedance 28 Ohm Gain 7,5 dBd F/B 23 dB 3-dB-angles 72° hor 55° ver |
The gain is 0,7 dB higher than the well known "Double-Quad" by DL7KM and DJ9HO. The mechanical construction is much easier!
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The lengths ot the elements, distance center to center of the tubes
| Ref.-Length | 1050 mm (10 mm) |
| D (Ref-Loop) | 320 mm |
| 3, 4, 6 (hor) | 312 mm (10 mm) |
| 1, 2, 5, 7 (ver) | 725 mm (10 mm) |
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New Double-Quadlong with higher gain and 50 Ohm impedance
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With feeding in the
lowest section (not in the middle) and a greater ratio between the
horizontal and vertical parts we get new characteristics: Impedance 50 Ohm Gain 7,8 dBd |
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All tubes 8 x 1 mm Aluminium
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