[ARC5] What does this test and how does it work?

[WA5CAB at cs.com]

It tests bullet style mixer diodes like the 1N21 and 1N23.

In a message dated 9/23/2008 10:44:49 AM Central Daylight Time, 
jcoward5452 at aol.com writes: 
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Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480