[ntp:questions] GPS_NEMA, but high offset and jitter?

Joseph Gwinn joegwinn at comcast.net
Mon Mar 1 14:23:40 UTC 2010

In article <7v1k7fFipuU1 at mid.individual.net>, David Lord <snews at lordynet.org> 

> unruh wrote:
> > On 2010-03-01, Kelsey Cummings <kgc at microshaft.org> wrote:
> >> David J Taylor wrote:
> >> ...
> >>> I would knock something up if there were enough interest, but it would
> >>> be a Windows program so of limited interest to the OP.
> >> That's the idea anyway.  At the time, I was convinced the PPS signal was
> >> showing clearly and it was but with the led transistor in backwards the
> >> PPS line was getting pulled down to 1.4v or thereabouts.  Not enough for
> > 
> > Hard to know how it would do that. 
> Transistor inserted with reversed C/E have low Vce breakdown,
> very low gain and possibly higher Vce_sat. They still operate
> as transistors and long time ago I've used in that mode but I
> can't remember what that was for (not so long after red spot
> or white spot transistors were sold in a box of one which cost
> a quid = eight weeks pocket money).

Inverted bipolar transistors were widely used as choppers (in synchronous 
detectors), as the offset is lower in that configuration.

Joe Gwinn

More information about the questions mailing list