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Vector network analyzers

A word about acronyms concerning network analyzers... vector network analyzers (VNAs) are often called "ANAs" by old farts, including the Unknown Editor. ANA stands for "automated network analyzer". A long time ago during the Carter administration, the original network analyzer (H-P 8409) was not automated, in the sense that TE error correction was done by hand. Return loss measurements could not exceed the VSWR of the equipment, so you couldn't resolve beyond 20 dB return loss in most cases. Gain and insertion loss and phase were calculated from the subtraction of two measurements (first the through connection, then the DUT connection). It was a bad time to be alive

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