Amount to brace up child J antenna

Amount to of a kind of be similar in shape brace up child perpendicular polarization antenna, be called " SLIM JIM " aerial, already applied extensively in professional communication domain. In spare communication experiment, this kind fine thin amount to brace up child J antenna also got favor.
This kind " amount to brace up child J antenna " if pursue,be shown. Its characteristic is: Radiation angle of elevation is extremely low, it is about between 10 ° of 0 ～ , have the gain of 3dB, efficiency is λ / of 4 GP antenna duple, because aerial oneself is had,match a function, can join with 50 Ω coaxial cable directly. The data shows, the GP antenna that the horizontal radiate intensity of SLIM JIM antenna compares 5/8 wavelengh goes out even by force a lot of, seeing its advantage is very apparent.
For the experiment this is planted of aerial send and receive function, the author carries mount amount to on the head in residential building brace up child J antenna. With standing wave the watch determines its feed chooses the place, discovery makes an appointment with λ from the lower end when feed dot / 8 when, its standing wave is in than making an appointment with 1  05 the left and right sides (the person that apply must actual measurement fixed position, this reachs above frequency to 150MHz paragraph communication is very important) .
Inside city, with 150MHz When 3W mobile phone uses this antenna, but the outskirts that understand 20km is in. Although have the interference of many paging stages, but its communication quality is quite reliable.
For the experiment its DX function, with TK - output of power of 708 machine 25W, QSO can be made with the HAM inside the Nanjing city outside 80km in evening, the other side gives RS - 55 ～ the report of 56. Reach the influence of climate because of more interference by day, the odds of QSO is opposite a few less.
Above experiment proves, amount to brace up child J antenna is made, installation, debug all relatively GP antenna is simple, and efficiency is taller. Spare to V/UHF communication has economic value. The author thinks to be worth to popularize. Those who need a specification is, after some HAM are installing this antenna, with one plastic hard canal is covered protection serves as on aerial, this has active sense. But the difference that provides quality because of horniness model, cover after going up in aerial, may affect standing wave comparing, try to notice in application please.

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