Current Distribution Profile
24th July 2009 - Richard Mason G6HKS asked me for a new design that could fit on a 4M length of 16SWG 3/4" square section tube. This presented me with several challenges. Firstly, YO7 will not run natively on LINUX or WINDOWS 7 that I am currently testing. I have tried all the latest offerings of antenna modelling software and frankly there is still nothing as powerful and accurate as YO7 for yagi design.
So I downloaded and installed DOSBOX, there are versions for all platforms. I was delighted to find that my copy of YO7 PRO is now running again. So I set to work and quickly recaptured my proficiency in using this awesome software.
The end result is plain to see, a yagi with an almost perfect 50-Ohms impedance at resonance, wide bandwith and good pattern. A front to rear power ratio of 24dB is very respectable. This antenna will fit into most situations and enable you to work DX!
73's de G4CQM
| Elements 3/16 Inch OD (4.76mm) |
Position (mm) | Length (mm) |
| Ref | 0 | 1022 |
| De 5/8 Inch OD (15.88mm) | 414 | 997 |
| D1 | 635 | 949 |
| D2 | 1236 | 929 |
| D3 | 1884 | 917 |
| D4 | 2715 | 894 |
| D5 | 3395 | 926 |
| D6 | 3950 | 848 |
NOTE: C=2.997925 X 108 meters/sec Design Optimised at 144.250MHz
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| YO7 SCREEN SHOT | VSWR, F/R etc performance graphs. |
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| E-Plane plot. | H-Plane plot. |
Back to Basics theme by Derek Hilleard G4CQM - Copyright © 2008 2009 All Rights Reserved
