Sun811
發表於 2010-6-11 10:08
9cm 係計出的, 一般monopole 天線要收得有效率最少 1/4波長, 以 786MHz 計算, 大約 9cm 就是最短了, 開 ...
kennethtcp 發表於 2010-6-11 09:44 http://www.post76.com/discuss/images/common/back.gif
多謝Ching回覆,有人用錫紙及紙皮便可做強力天線,天線要去皮約42cm(要露出銅線),然後穿過已製作好的錫紙及紙皮(將錫紙貼在紙皮上),再將銅線屈成每邊10cm的菱形(垂直在錫紙上),我都想試這方法,因我住石籬,可能未必收到。
kennethtcp
發表於 2010-6-11 10:39
多謝Ching回覆,有人用錫紙及紙皮便可做強力天線,天線要去皮約42cm(要露出銅線),然後穿過已製作好的錫 ...
Sun811 發表於 2010-6-11 10:08 http://www.post76.com/discuss/images/common/back.gif
Give it a try, no harm, the aliminum sheet is used as a reflector, and the total antenna length is nearly the wavelength, with each edge around 1/4 wavelength, it should be a very effective antenna.
七彩小生
發表於 2010-6-11 10:44
玩下無防, 但唔好整啦,整得肉酸米又係要買, 比幾草野買條雞骨啦.{:6_195:}
多謝Ching回覆,有人用錫紙及紙皮便可做強力天線,天線要去皮約42cm(要露出銅線),然後穿過已製作好的錫 ...
Sun811 發表於 2010-6-11 10:08 http://www.post76.com/discuss/images/common/back.gif
testching
發表於 2010-6-11 10:48
樓主講得啱!我住粉嶺但係啲窗向南及西南,點都唔得!