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好资料,收藏慢慢研究。
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场地有限的话,使用两臂夹角90度也可以,但是前后比不如夹角120度的好了。例如:
20m波段= 738 / 14.2mhz = 52英尺,缩短率6%= 49英尺;
15m波段 = 738 / 21.3 = 34英尺 6英寸,缩短率6% = 32英尺6英寸;
如10m vee beam,测试如下:
10 meter horizontal 3/4 wave vee
project supplied by roger, k6lmn using eznec 2.0
10m水平 3/4 wave vee dipole
eznec 2.0 results from roger, k6lmn
50 英尺高于地面
apex = 100 degrees
z in = 110 ohms
vswr = 2.2 : 1
element lengths 25.8 feet
#10 wire
freq 28.6 mhz
gain 11.06 dbi
angle: 0 deg
f/b 2.0db
bmwidth: 35.3 deg
-3: 342.3 17.6 deg
slope 8.98 dbi
angle: 180 deg
f/s lobe 2.08db
max gain = 11.06dbi
- 2.14
= 8.92d
- 5.50 ground enhancement
yields aprox 3.42 dbd in free space!