[time-nuts] GPS active antenna delay ?

[Attila Kinali]

On Wed, 18 Feb 2015 07:24:32 -0800
Jim Lux <jimlux at 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

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