[GreenKeys] Why high loop voltages?

[WA5CAB at cs.com]

Actually, this very same subject was cussed and discussed at considerable 
length here something like two weeks ago.  So when the question showed up this 
afternoon, I assumed it was tongue in cheek after the lengthy but humorous post 
last week on the common cycle of a subject on lists like this one.  Only that 
it came sooner than 6 months.  I expect that if you go to the archives you 
could find much the same correct, sorta correct, and incorrect explanations two 
or three times a year all the way back to the beginning.  Like the oil 
question.  :-)

I will add one comment about dry versus wet switch contacts, though, as it 
was mentioned only in passing in the last cycle.  The significant difference 
between the switch contacts on the M15 keyboard and those on most if not all 
switches in an automotive 6, 12 or 24 volt application is that the latter contacts 
are usually of the self-wiping design.  The keyboard contacts are non-wiping. 
 Meaning that after they first touch as they make they do not move relative 
to each other.  12 volts is very definitely not enough to reliably burn through 
a layer of oil on the keyboard contacts.

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480
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