@ab3xu Sadly any more than that and it wont work well on the frequencies I wanted. The 126 turn one I tried out had some cool characteristics (like very low insertion loss) but self-resonated so much as to be useless.

@freemo
I have a partially built N2PK SWR meter with a similar coupler -- 11 bifilar turns on a toroid with coax is the primary. And hopefully it will work as designed! as I know very little of the theory that goes into their design

@ab3xu In this case it is for the sort of next level after a SWR meter. Part of a VNA Radio Meter. It doesnt just report reflected power but rather complex power, plotted to a smith chart in real time.

@freemo @ab3xu What bands is it tuned for?

@bamfic Full PEP (1500W) 1MHz - 55 MHz,

@ab3xu

@bamfic

Screenshot in demo mode (not actual reading just showing off the UI).

@ab3xu

@freemo @ab3xu Cool, so HF then. Impressive. Did you write the software yourself?

@bamfic
Yup everything is open-source, including hardware and software. so far I am the only author. Version one worked well and was accurate, version 2 expands on it and will be more useful with a better UI. V2 will be the one someone would actually want to build which is what im developing now. V1 was a proof of concept that worked find had to be explicitly told what frequency it was on (no frequency counter).

@ab3xu

@bamfic @ab3xu

Oh i forgot to mention. V2 I'm working on will have 2 possible configurations. You can hook up a single Directional Coupler to it as you might a SWR meter. Or if you want you can hook up two, one before and one after your tuner. In this way the meter can track the actual antenna performance and the tuned performance at the same time. I might even add logging for analysis on a computer, or to review for checking ones on logs (since it would record the frequency time and power of any transmission, along with other info).