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All of the self build designs detailed here use 1/2 Inch (12.7mm) round OD tube elements throughout...
Wave Antennas yagis by G4CQM have been designed using K6STI's YO7 Professional version software which is very accurate with larger element diameters. Key attributes include low average Q-factor and cleaner patterns!...
Designing high performance yagis is very time consuming, there are so many variables and an almost infinate number of variants.
Over the last five years I have explored extensively all the possibilities with my in depth research project resulting in the Advanced OWA (AOWA) an optimal 50-Ohm direct feed type yagi design.
Wave Antennas yagi designs are the outcome of this long term R&D project by G4CQM in a quest to discover the ultimate in direct feed yagis... The resultant original designs can deliver extraordinary performance that is second to none!
You can benefit from my research and build your own yagi which will outperform most commercial antennas and save you money in the process, the choice is yours!
Derek Hilleard G4CQM
An open/split dipole used in these designs requires no tuning delivering an efficient and low loss direct connection to your 50Ω coaxial cable feeder...
Why 50Ω then? Direct feed at this impedance offers maximum efficiency and minimal losses. These yagis are tuned for least reactance across the band deliberately low at the HF end and so deliver all weather performance!
No hydraulic hose clamps in use here, purpose designed professional parts are manufactured right here in the UK.
Don't be fooled by color, these durable UV stabilized plastic moldings contain absolutely NO CARBON and so remain cool in a microwave oven test!
Advanced OWA's are 50-Ohm direct feed low temperature yagis and designed for use by serious DX enthusiasts.
AOWA yagis boast excellent patterns with special attention paid to major side-lobe reduction in both the H & E-Planes. Unwanted interference and man made noises are suppressed aiding weak signal communication!
Those of you who are in the know will see that these specialist designs have been carefully examined in TANT and boast some of the lowest Tloss (internal losses) and T_ant (temperature antenna) figures around!
Designed using the very powerful, proven and uncompromised YO7-Pro (YO7-Professional version from K6STI) software. All of the designs performance characteristics have been corroborated in AOP & 4nec2.
Q-factor can have a major impact on stability in bad weather and proximity to other structures. It's not just about available VSWR bandwidth, the lower 'Q' designs offer greater stability and should be considered as the first choice in locations suffering extreme climatic conditions, perhaps even above other desirables!
Q-factor in the real world: A guide based on field trials (last five years) and recent analysis (2014)...
The simple rule, the lower the 'Q' the better is stability. Yagi designs sporting a very steep exponential curve when plotted are not ideal, this dramatically raises the average 'Q'!
Wave Antennas yagi designs have been kept simple with minimal construction to avoid problems!
THESE YAGI ANTENNA DESIGNS ARE NOT FOR COMMERCIAL USE OF ANY KIND
Private experimenters are free to use these designs for their own personal enlightenment. However, no guarantee or warranty is offered or implied.