On Wed, 18 Feb 2015 07:24:32 -0800 Jim Lux <jim...@earthlink.net> wrote:
> > [1] http://miniradiosolutions.com/minivna-tiny > > > > > And tough to find any substantive information on the hardware design. I > poked around for a few minutes, but all I was able to find was software > user manuals, but no hardware description. > > I assume that it's the usual 2 port, 1 direction thing.. A DDS for the > RF source, and some sort of dual channel detector with directional > couplers or a bridge on the output port When i had one on my desk, i opened it up, but apparently i forgot to take pictures. From what i remember, i think it works either similar to the VNWA design done by DG8SAQ[1,2] or by N2PK[3]. The tinyVNA can only do S11 and S12, lacking the additional source at the second port. Attila Kinali [1] http://sdr-kits.net/DG8SAQ/VNWA/baier_VNWA10_QEX.pdf [2] http://sdr-kits.net/DG8SAQ/VNWA/QEX-Letters.pdf [3] http://n2pk.com/VNA/n2pk_vna_pt_1_ver_c.pdf -- It is upon moral qualities that a society is ultimately founded. All the prosperity and technological sophistication in the world is of no use without that foundation. -- Miss Matheson, The Diamond Age, Neil Stephenson _______________________________________________ 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.