Double humpin'

• To: tesla-at-pupman-dot-com
• Subject: Double humpin'
• From: Richard Hull <hullr-at-whitlock-dot-com>
• Date: Tue, 05 Nov 1996 10:37:59 -0800

All,

I get the impression that some of our folks think that you get a double 
hump or spliting of frequencies at tight coupling.  Double humping only 
occurs in spark systems when we exceed the point known as "critical 
coupling".  critical coupling has only a little to do with 
actual inductive coupling (about 50%)

If we throw a fixed gap of a fixed dwell/quench in a system, critcal 
coupling occurs at some fixed coupling coefficient K=X.  If we have a 
variable dwell/quench gap, and a fixed tight coupling, by varying the 
dwell we can make the system go from  below critical coupling to well 
beyond.  In short, critical coupling is a sliding point based on actual 
inductive coupling and dwell/quench time of the gap's realizable 
quenching ability.  In theory we can have a single frequency output (no 
splitting) at k=.65.  This was the struggle in the early days of spark 
transmitters in the 100KW-.5MW class.

Richard Hull,TCBOR

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