什麼天線感度最好
本帖最後由 davidyen 於 2012-4-26 21:29 編輯什麼天線感度最好?之前用了DIAMOND D-130全頻傘型天線+aor3000發現接收的靈敏度一直好不起來,不知友台都是用什麼樣的天線或是tune那支天線我也曾接上木瓜和全頻天線在14和43兩者一比d130馬上就被比下去了線上有經驗玩存接收的友台發表一下你們寶貴的經驗 接收機要收訊好，天線跟發射使用的沒太大差異
全頻天線只是方便，所以信號也是隨便
要聽短波還是得拉長線天線
其他波段頻率也是要配合的天線效果才會好 沒頭沒尾.....無解..... {:4_146:}{:4_146:}{:4_146:} 請說清楚講明白
WSUgocouars 發表於 2012-4-26 21:04 static/image/common/back.gif
沒頭沒尾.....無解.....
{:4_141:} 除了標題外,竟沒半個標點符號?
有辦法一口氣唸完的,請舉手!!! Description
D-130 Super Discone Antenna
The D130 Super Discone Antenna is an ultra-wideband antenna covering amateur radio, commercial 2-way, cellular, air traffic control and various utility frequency bands. Rust-free stainless steel is employed in major component parts making the antenna rust resistant and durable.
Special Features:
• Ultra-wideband design 25 to 1300 MHz receive, 50-1300 MHz transmit (6m tunable for transmit)
• Compact and lightweight design enables antenna to be installed on balcony railing at an apartment or condominium
• Ideal for 2m, 1-1/4m, 70cm, 33cm and 23cm amateur bands
• Excellent "shop" antenna for testing various transmitters on a single coax
• Can be made further compact and lightweight by removing the top loading coil if 25-50 MHz reception is not required
Specifications:
Bands: 25-1300 MHz
Gain dBi: 2 (nominal)
Max Power Rating: 144 MHz up: 200 watts
6m: 20 watts FM, 50 watts PEP
Height: 5.6'
Weight: 2.2 Lbs.
Connector: UHF
Element Phasing: Wideband Discone
Remarks: Adjustable 50-54 MHz.
說真的, wide band antenna 要做到 high gain 很難. D-130 才2dBi.木瓜或長的車天線的gain隨便都比它高... 除非投資下去搞個幾組不同 high gain antenna 來切換選擇... 否則應該很難面面俱到吧!!?? 感謝分享{:4_162:} 感謝大大的分享~~ 即便只是接收，雖然沒有像發射那麼嚴謹
可是原理一模一樣
想要收的好信號，天線的標準需跟發射一樣
天線長短跟接收頻率有關
頻率越低，天線越長
以1/2波長計算
30MHz約需5公尺長得天線
最差也要使用1/4波長天線
天線只要阻抗匹配，長度與頻率諧振，就是好天線
不知你想接收哪個頻率範圍的信號 感謝分享,長知識了.....{:4_162:}
