SWR Meter(bridge)

 SWR Meter: Port over

Postby Mr. Nick » Sun Sep 27, 2015 9:29 am

 

I built this SWR meter recently using mostly junk parts or stuff I had in my parts bin. It's meant for HT use or QRP, around 1 to 5ish watts. It seems to work well to 2 meters and a bit higher. I will test the bandwidth at work with a spectrum analyzer and tracking generator.

This project is based on a resistor bridge design from : http://ludens.cl/Electron/swr/swr.html . This guy does some good stuff.


Pictures attached. Yes, that is a Tupperware container. I am a cheapskate! Enjoy!

 

 

 

 

Postby Mr. Nick » Sun Sep 27, 2015 1:01 pm

 

You can make your own scale but don't have to. I put reference numbers on the side tested using known resistor values. It is very repeatable. Just key the transmitter with the meter set to forward power, adjust to a reading on 100 on the scale. Switch to reflected power and the scaling is correct. It will be spot on so long as you do the forward power "calibration adjust" .

For a handheld it is usually happy with an swr of under 2.

 

Seems to work okay into the 70cm band. Very wide band resistive bridge.