Justin G0KSC published design information for his Low-Noise 'Urban' 8 element LFA Yagi for 144MHz on 25th August 2009. He has made many claims for his LFA Loop, and for a while many hams were taken by its appeal!
Meanwhile Martin DK7ZB carried out his own tests/experiments with help from Sven SM7DTT and others to see if a 12.5Ω yagi with Split Dipole or Folded Dipole could deliver similar performance. Design information and final results can be seen here: The redesigned 8LFAD with a simple 12,5-Ohm-Dipole or a Folded Dipole.
The challenge for me personally was to see if a 50Ω Direct Feed yagi design with a simple Split Dipole could equal the LFA?
During my six year long research project I have made significant improvements to my designs with help from several fellow Radio Amateurs who were prepared to give my designs a go! The results seen below speak for themselves...
Click on images for full size view, opens in new window!
|G0KSC 2M 144MHz 8 element LFA||G4CQM 2M 9 element WA9XX|
|8LFA seen in K6STI's AOP at 144.1MHz||WA9XX seen in K6STI's AOP at 144.1MHz|
|8LFA seen in K6STI's AOP at 144.5MHz||WA9XX seen in K6STI's AOP at 144.5MHz|
|8LFA Vs WA9XX Azimuth 144.1MHz||8LFA Vs WA9XX Elevation 144.1MHz|
|8LFA Vs WA9XX Azimuth 144.5MHz||8LFA Vs WA9XX Elevation 144.5MHz|
|8LFA SWR 144-146MHz||WA9XX SWR 144-146MHz|
|8LFA Average Q-factor||WA9XX Avearge Q-factor|
|Tsky = 287K Tearth = 5126K (Residential = 12 dB)|
|* Ta (°K)|
@ 30° Elev
|* G/Ta (dB/°K)|
@ 30° Elev
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