Low Q Long Yagis by G4CQM for Terrestrial VHF/UHF DX'ing05-02-2021... In past years Long Yagis were the number one choice for most serious DX'ers, those old designs created by adopting basic principles along with trial and error including a generous testing regime... Derek G4CQM presents a selection of modernized VHF/UHF Low Q Long Yagi designs optimized with K6STI's YO7 Professional version software and calibrated with NEC-2. Limitations associated with NEC-2 have been carefully avoided as there are no tapered or bent elements, no junctions, and no close proximity spacings. Unique element mounting clips designed by Derek avoid the need for correction by conforming to the DL6WU mounting directive. This requires that each element is raised more than the boom radius (r) above boom. A special tuning technique conceived by G4CQM gives rise to a low average Q-factor with subsequent wider bandwidth than older traditional designs, critical in delivering a stable antenna. From experience the very best designs occur when YO7's unique algorithm and NEC-2 concur... For kits and parts to build these designs contact Richard Mason G6HKS for full details, specifications and prices. | MENU | BALUN | PARTS | WS716464 | 4323WL50 | CQM3WL50 | 2M9N50LY | 2M8N50LY | 2M7N50LY | 2M6N50LY | 2M5N50LY | Wave Antennas | Old Vs New - Average Q-factor comparison | |
2M7N50 old style gain optimized Long Yagi | New 2M7N50LY Low Q Long Yagi by G4CQM |
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Understanding YO7To reduce screen clutter, YO7 does not label the figures displayed within the Yagi patterns. They are as follows (shown in yellow font): PARTS | |
Specialist and unique DE moulding and element mounting clips designed by G4CQM available from Richard Mason G6HKS (kits and parts) | |
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TOP ^ WS716464 - 70cm Band (432MHz) 4.64λ 16 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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428 - 438MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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4 x WS716464 makes an ideal compact EME array with DL6WU stacking distances (H=1434mm V=1340mm) | |
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TOP ^ 4323WL50 - 70cm Band (432MHz) 3.02λ 10 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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428 - 438MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ CQM3WL50 - 2M Band (144MHz) 3.02λ 10 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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140 - 150MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ 2M9N50LY - 2M Band (144MHz) 2.52λ 9 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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140 - 150MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ 2M8N50LY - 2M Band (144MHz) 2.14λ 8 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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140 - 150MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ 2M7N50LY - 2M Band (144MHz) 1.68λ 7 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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140 - 150MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ 2M6N50LY - 2M Band (144MHz) 1.23λ 6 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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140 - 150MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ 2M5N50LY - 2M Band (144MHz) 0.8λ 5 Element Yagi | |
NEC-2 E-Plane Calibration | NEC-2 H-Plane Calibration |
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NEC-2 E-Plane | NEC-2 H-Plane |
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140 - 150MHz (Not calibrated against NEC-2) | Elements: Positions, Lengths, Diameters |
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TOP ^ Legal
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