[time-nuts] Building a GPSDO & trouble using Jupiter-T
hmurray at megapathdsl.net
Fri Feb 3 01:49:53 UTC 2012
> Remarkably, the simplest and still one of the best GPSDO I've tested was the
> 10 kHz Jupiter and analog PLL-based standard by James Miller. It performed
> superbly. It's the 4th GPSDO at: http://www.leapsecond.com/pages/gpsdo/
In hindsight, that doesn't seem too surprising.
I'm not a Juniper wizard. I could be way off here.
I'm assuming the Jupiter does phase jumps every second and uses DDS like
mechanisms within each second.
The DDS will make spurs. A simple analog filter will get rid of most of
them. What gets through will be close in. The phase jumps turn into close
in phase noise where "close" is under 1 Hz.
How would you measure that sort of phase noise?
These are my opinions, not necessarily my employer's. I hate spam.
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