diy 天線問題

arvid

不知有沒有發錯板.但是小弟心中有所疑問.

近幾年.因為出差問題.比較有無線網路的天線資料.....

大家也知到現在沒網路.很難過.......

想問.....假如我把下列的網址.換算公式.diy製程144頻率天線是否可行

http://wireless.gumph.org/articles/homemadeomni.h

ps:我想知道diy線的信任度.需要有哪些儀器(駐波比表).小弟也也做過四菱形天線.效果都還不錯......


Each sector of the antenna needs to be a 1/2 wavelength long multiplied by the velocity factor of the cable. The velocity factor of RG-213 is 0.66 . If you decide to use different cable (such as LMR-400) then you need to get the velocity factor of that cable (which will be different), and recalculate all the dimensions.
                  V * C    0.66 * 2997924581/2 wavelength = ------ = ---------------- = 0.0405m = 40.5mm                  2 * F     2 * 2441000000                      V = Velocity Factor   of  RG213  = 0.66C = speed of light = 299792458F = Frequency of Signal = 2441000000 (middle of 2.4ghz range)

a123456b789

哎呀 - 找不到網頁

arvid

很抱歉....

麻煩請試試用 GOOGLE   

收尋: Easy Homemade 2.4 Ghz Omni Antenna

renjong

理論上看起來是可行的!
只是要記得依照線材的velocity factor 去乘上不同的係數..

基地用的GP天線(大支木瓜),就是用一樣的原理做的.
只是照該公式算出,145.00MHZ 每ㄧ節 68.23cm.....實際能做幾節?

sky

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