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2015年9月20日 (日)

Test of vertical antenna

I tried to test of vertical antenna that is made of me at the near the beach today.

I made 2 types vertical antennas.
First , I made it that is un- grounded  vertical antenna.
That  specs are very simple.
Antenna element is made of copper wire,Height is about 4m,.
Ground,that's made of grid of iron,about 2.0m * 1.5m ,and add the zinc sheets for 4 direction
.
Img_2375
Img_2379
(Ground is made of grid of iron)
Photo_6
 
I measurement this antenna impedance.
That  tuning is about 15.6MHz(parallel mode).
Img_2382_2
That's is very High Q!!
NEXT, I made a grounded  vertical antenna.
That is supplying to center antenna.just like YAGI antenna.
Photo_7
 
Img_2378
 
Img_2376
Img_2383
The imaginary part is starting ”+j(Ω)”,and that inclination curve is very ⊿up.
I think that antenna is not easy to adjust  Z MATCHING.
ANYWAY, I able to get some date of  grounded  vertical antennas.
I am so happy!!!

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