Since it is forward and reflected power, at the strip lines, we are looking for, any attenuated signal will do. With this circuit I could get the meter going for UHF using an old 5w CB radio I don't use anymore and on 2m I could use a 5w handheld. Either might blow up a radio so I built the following short attenuation testing circuit. The obvious choice is a radio but I needed to be able to test infinite SWRs both open and short circuit. To be making a SWR meter, I needed something to test it as I went. With a bit of messing around and matching with a few resistor values, it can also be used to measure power levels or RF voltage. You can make your own pickups for HF, VHF, UHF and higher. It costs only a few dollars to add extra frequencies and other functions such as RF Volts. Here is a way to build your own accurate homebrew SWR meter and customise it to your own needs. Technically striplines have a ground plane on both sides and those here are technically micro-striplnes because they only have one. You should also note, I have used the term "striplines". The text of this project should be read in conjunction with STANDING WAVES in the info section. VK5AJL - Build your own micro-stripline SWR meter - the only way to measure SWR.
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