[time-nuts] Fluke Thunderbolt Monitor Revisited

Dan Rae danrae at verizon.net
Sat Jun 5 15:16:35 UTC 2010

GandalfG8 at aol.com wrote:
> 3...The series input and base to ground resistors on the RS232 interface  
> are both 180 ohms, rather than 10K and 3K3 respectively as in Didier's  
> circuit.
If one wanted to use the RS232 interface to a computer at the same time 
as the ko4bb monitor in parallel, which I often do, then you would be 
well advised to stick to Didier's original values there.  RS232 is quite 
robust, but still...  I built one here quite early on to the original 
design and it has performed flawlessly ever since.

I can not for the life of me figure out what oriental logic dictated 
these changes in the first place.

And well done Nigel for getting to the bottom of this!


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