Bob,
On 12/11/2014 02:25 AM, Bob Camp wrote:
Hi
On Dec 10, 2014, at 8:02 PM, Mike Monett <[email protected]> wrote:
OK, so I figure out how to do this. How do I tell if this is making the
gpsdo more accurate? In other words, how do I get the ADEV without having
an H-Maser?
You get a Cs (or other atomic standard) or you compare several different
GPSDO’s against each other. The preference would be for groups of three so you
can rule out ones that are not doing what they should.
GPS receivers can have considerable common mode effects, which won't
show up in the three-cornered hat setup. You can work with a rubidium
clock and a crystal clock if you don't have a cesium standing by.
You also need the measurement gear to resolve frequency down in the 1x10^-13
range. A normal counter will not do that.
Indeed.
Cheers,
Magnus
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