Another way to get transmission line parameters from VNA or VIA
measurements is to measure S11 with the far end open and shorted, or to
measure S21 and export the data to AC6LA's Zplots spreadsheet. I've
used this with good results for 50 and 75 ohm coax, and for closely
spaced parallel wire line in the range of 90 ohms.
Although S21 data and S11 data should produce the same results, Dan told
me that users of his spreadsheet reported more consistent results when
S11 data sets were used. I've tried both, and agree that the S11 data
sets are the better way.
There's a lot of useful stuff on Dan's website. http://www.ac6la.com/
73, Jim K9YC
On 8/8/2013 2:59 PM, Steve Hunt wrote:
I managed to find time today to produce a web page on my measurements.
For anyone interested:
http://www.karinya.net/g3txq/wet_ll/
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