Not all vacuum relays are all that fast.  The HC-1 and RJ-1A are 
fast because they have only one movable contact -- i. e., they are 
SPDT.   DPDT and 3PDTvacuum relays are comparable in speed to 
conventional relays. 
 
On May 1, 2004, at 12:00 AM, Ian White, G3SEK wrote: 
 
 Specifically, what makes them so fast? 
 
I've never seen a picture of how the typical small 
ITT/Jennings/Kilovac relays work, and they're too rare over here to 
justify taking one apart... besides, it would let all the good stuff 
out. 
 
 --
73 from Ian G3SEK
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 Richard L. Measures, AG6K, 805.386.3734.  www.somis.org 
 
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