22-01-2019... Visitors Online: Visitors Today:
Wave Antennas (G4CQM's Homebrew Yagi Projects) are very special yagi designs for the Amateur Radio VHF/UHF bands created by Antenna Designer Derek Hilleard G4CQM, and were first conceived in K6STI's YO7 Professional version software... If I were starting an antenna company from scratch, this is how I would want my yagi designs to be, at their very best!
Each design has carefully balanced parameters and benefits from the OWA (Optimized Wideband Antenna) Yagi Design concept. Final adjustment using Arie Voors modern/powerful 4nec2 ensures highly accurate designs with segmentation set at 25 segments per λ/2 for tuning purposes. Efficiency >99% is achieved through 50Ω direct feed and 1/2 Inch (12.7mm) element diameters! There are no awkward/unnecessary bent elements or different diameters to contend with, so construction could not be easier. Actual boom length restricted to a maximum of 5M on each frequency band to facilitate a simple one piece boom, and a home constructed yagi that will fit most locations...
Lionels new VE7BQH Antenna Tables now incorporates both rural and residential local noise temperatures simulating local environments, and is huge step forward in revealing those yagi antenna designs that really are low noise. You will soon learn that there is much more required in the design process than just enhancing F/B (Front to Back) or F/R (Front to Rear) power ratio, and in order to achieve the lowest temperature yagi. Instead, looking at overall sidelobe content, in particular the forward lobes, has a major impact on delivering a quiet EME antenna system for the higher bands (144MHz and upward)! Analysis of WA8C9 AOWA yagi design demonstrates this design technique to advantage when compared to bent driven element rivals!