domenica 3 febbraio 2019

OFF CENTER FEED DIPOLE: A SIMULATION AND A TEST

OFF CENTER FEED DIPOLE:  testing unusual % dimensions

Total length: 21 meters; Off center feed at 25% of lenght (usually we can find 30%)
One leg: 5,25 meters; the other leg: 15,75 meters.
Why 5,25 m? This is not the best %; but for the moment i do not want to cut my vertical antenna aluminium tube. This is a test; if a will have good result i will try to optimize.



You can see minimum SWR at 7 MHz, 14,2 MHz, 21,1 MHz an 28,3 MHz. Using it with a balun and/or wiht an antenna tuner you can easily tune it for these band.
So, i am going to test this antenna with my RIG:

MicroBitx with antenna tuner Kenwood AT-130; the antenna has  a vertical 5,25 meters tube, and a wire of 15,75 meters that is over a tree in his final part.

Today easy contacts on 40 meters, and first contact on 60 meters (with SWR at 1:1.1)

73 de IZ3AYQ




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