Re: VNA Reference Impedance Renormalization
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Good catch, Dave!? I'd kind of skimmed over the .pdf and then filed it for future reference myself.
I'd measured some boards probably 10-15 years ago with a 50 ohm VNA and was surprised to get reasonable measurements.? I figured the power distribution network we were looking at would swamp out the 50 ohms of the VNA with near shorts and opens, but it didn't.? Must have been in one of those sweet zones.? In my *spare time* I'll run some resistors on the Advantest VNA in my garage lab (don't hold your breath waiting).
Jim Ford Laguna Hills, California, USA
On Friday, February 21, 2025 at 04:30:31 AM CST, Dave_G0WBX via groups.io <g8kbvdave@...> wrote:
Hi.
Just me, or is there a bit of an inconsistency on page one of
that PDF?
Between the text descriptions and the illustration below,
regarding how to measure Low, Medium and High impedance DUT's.?? I
think the order of the text descriptions and the illustrations are
different.
Also, the first illustration surely is a S11 measurement, not
S21.
Yes, No??? If no, why, in detail please.
73.
Dave 'KBV.
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