The AQRP VIA (the Vector Impedance Analyzer from the Austin Texas QRP Club)
is a V/I type analyzer. And they have extended it for use as a 2 port analyzer.
Works well. Kit #25 toward the bottom of this webpage:
Very similar to the nanoVNA, using the same ADC and Si5351 and a small ARM uC.
But only has two SA612 mixers, one each for V and I. Extends freq range using harmonics.
Has been available since around 2012, My guess is Edy555 took a good hard look at it.
Jerry, KE7ER
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On Mon, Sep 9, 2019 at 08:23 PM, Dr. David Kirkby from Kirkby Microwave Ltd wrote:
To the best of my knowledge, the IV method is not used for transmission
measurements, but I don¡¯t see any reason a variation of it is not possible
for transmission measurements.
