Re: Improvement for 40m BPF for the U3s

Christoph Schwärzler

Another jig for those LPFs and BPFs built here. Optimizing for S21 while checking on impedance (S11) just  becomes so much fun with the NanoVNA. Especially if you use it together with a PC running NanoVNA saver.

The adapter was made using a single sided copper PCB and employing the toner transfer method. I attach a few pics for your info and the .svg file in case you want to build one, too. Import in a graphics program (e.g. Inkscape) and print. Solder SMA females to the PCB and headers to plug the LPF/BPF into.

Vy 73,
Chris OE1CGS

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