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The active of aerial brace up child the distance makes an appointment with 5 ～ between feed end 10 millimeter. I was not added " evenly - lopsided " converter, 50 ohmic and coaxial cable receives active directly brace up child. Horizontal Zhen Zizu fights about 73 ohm. The passive Zhen Ziyue of 8 wood antenna is much, input impedance will be lower. The antenna of YAGI of 70 centimeters of wave band of the 5 EL that 4 RAE does, active brace up child it is amount to brace up child (impedance 300 ohm) , but pass coaxial cable １ : Of １ " evenly - not judge converter " receive amount to directly brace up child feed end. Make it 5 EL YAGI, use aftereffect fruit is pretty good. Will be in with BG4RAE in June this year QSO of this wave band, signal 59. Of 4 RAE " evenly - lopsided " converter, it is type of a kind of sleeve be callinged " evenly - lopsided " converter. Say from the principle, idol pole aerial or amount to brace up child aerial, when line of make a present of is coaxial cable, should add turn
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Change implement, the feed that finish is lopsided - the changeover of the balance, but the plan when be being made below spare condition is simple, if be not being added, also can use. The sleeve type of 4 RAE " evenly - lopsided " the structure of converter, see figure please 3. The YAGI antenna that I make, each distances between Zhen Zizhi are equidistant, what 4 RAE does is not equidistant, it is the YAGI antenna of 5 EL together, the dimension that total length gives out than me is a few shorter. The analysis from schoolbook knows, the dimension of a YAGI is not exclusive. If the distance of each director is a few longer, the directional meeting of aerial is a few stronger, but the distance is too long, it is gain can drop, the 2 dimension that are aerial also increase at the same time. Usually, 0 what each distances between Zhen Zizhi are wavelengh. 2 the left and right sides is more appropriate. Remember having word of ad of a TV, carelessness is to be close friends namely with, even good-looking. Go up to the aerial a surname that has made finally green lacquer, at hand of as it happens still has a bit flaxen from spray paint, careless gush, to it " wear " one confuses colour to take. Attached drawing 4 it is to assemble sketch map.
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