自制144/433合路器，两根天线共用一根馈线。 [复制链接]

有空再译，或有谁帮译一下。
总之，原理是，利用电感、微调电容与盒子里的馈线形成四分之一波长的短截线，利用短截线来滤波。微调电容可用来不同频点。
On the left hand side of this circuit diagram a 433MHz 1/4 wavelength coax stub is indicated that is effectively short circuited at the outlet end by a series resonant L/C circuit tuned to 433MHz. This arrangement presents a very high impedance for 433MHz signals at the input (ie top connection) of the device, but will freely pass 144MHz signals. Similarly on the right hand side of the diagram, a 144MHz 1/4 wavelength stub is indicated terminated with a series resonant L/C circuit that is tuned to resonate at 144mHz. This side of the circuit will block signals at 144mHz, but will pass 433MHz signals unhindered.

Dimensions for the 1/4 wavelength stubs are given, but depending on the particular coax cables used, some experimentation might be needed, especially for the 433MHz stub. This isn't too difficult. My procedure for setting up this diplexer was as follows:


1. Connect low power transmitter with SWR meter to the input connector.
2. Connect 50Ω dummy loads to output connectors. Dummy loads can be two small 100Ω resistors connected
   in parallel across a BNC plug.
3. Adjust the trimmer capacitors for minimum SWR readings.
4. If SWR readings close to 1:1 cannot be obtained then try using slightly different stub lengths. It was fairly easy
   to find the optimum length for 144MHz. The 433MHz stub length was more critical.
I built this diplexer into an aluminium die cast box as shown on the left. The device continues to work very well, giving very low SWR readings on both bands.

http://s217877884.websitehome.co.uk/amateur_radio/amateur_radio_antennas/amateur_radio_antennas_antenna_switches.html

可调电容安置上为什么不转个口固定在盆上便于

调节？

再就是如果谐振点调好后，用电容表分别测量两个可变电容值，

用固定电容替代！

那成品天线原理是一样的啊，才明白

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老外真的好聪明，左433串联谐振，就成为433  4分之一波长远端短路，变为433   4分之一波长近段端无穷大阻抗，，对于433来说断路，论坛里4分之一波长同轴线做陷波器也是这个原理，J型天线也是这原理，右边145也是这个原理。

挺好。有空试试。

在这个电路图1／4波长同轴433MHz存根表明有效地短路的出口端通过一个串联谐振L / C电路调谐到433MHz的左手边。这样的安排提出了433MHz信号在输入一个非常高的阻抗（IE顶部连接）的装置，但可以自由地通过信号传递。同样，在图的右边，一个通过1／4波长的短表明与串联谐振L / C电路，调谐谐振在通过终止。该电路这方面将块信号通过，但会通过433MHz信号畅通无阻。
对于1／4波长的短尺寸是给定的，而是根据特定的同轴电缆的使用，一些试验可能是必要的，尤其是对于433MHz存根。这并不太难。我设立这个双工器程序如下：
1。低功率发射机驻波表连接到输入连接器。
2。连接50Ω假负载输出连接器。假负载可以是两小100Ω电阻连接
并行在BNC插头。
3。调整最小SWR读数的微调电容器。
4。如果SWR读数接近1:1，不可再使用稍微不同的短长度。这相当容易
为通过找到最佳长度。433MHz短长度更重要。
我建立这个双工器为压铸铝框显示在左边。设备继续工作的很好，给了很低的SWR读数都带上。
双语对照

路过 学习一下