On 21 Aug 2016 03:19, "Attila Kinali" <att...@kinali.ch> wrote: > > Moin, > > I stumbled over a new open hardware/source VNA design: > http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html > > Unlike other designs out there, this one is very well done and has very > little room for improvement, without increasing the price considerably.
I am not convinced that this is time-nuts related, although I am sure many time-nuts either have a VNA or would like one. Such a project needs its own forum. That said, I don't know why the author is using directional couplers. A bridge is much wider bandwidth. It is more lossy though. The software is I believe the tricky part. The VNWA software is very sophisticated, with a lot of useful features like it can design matching networks, The software in the PNA-X is very sophisticated too, but in different ways. I don't know what the author uses, but Qt seems like best choice to me, which can be be built on OSX, Linux and Windows. For many measurements power levelling is not required, so that bit could be dispensed with. The author seems of the opinion that a lot of the hardware imperfections can be corrected in software. Thak is true, but the the residual errors that remain are a function of the quality of the hardware. Anyway, it is an interesting project, but personally if I were going to go to the effort of building a 2-port VNA, I would build one with 4 receivers. Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.