Hi
Well ….
A reasonably good DOCXO will come in around 2x10^-10 over 0 to 70C. Over a
typical 4 C “lab wander” you should see < 1x10^-11. After being on power for a
month
or three, aging should be below 1x10^-11 per day.
ADEV wise, it should do better than the GPSDO …..parts in 10^-13 are no
Thankyou to all who responded. It looks as if 2 parts in 10^12 is about
what can be expected - certainly much better than the 1 part in 10^9
available from a typical double ovened quartz crystal oscillator barefoot.
Cheers!...
Hi
Maybe a good idea to “back up” a bit here:
The most commonly plotted data for the performance of a GPSDO is ADEV.
Very simply put, to do ADEV you take a series of readings at a specific time
spacing ( called tau ). The delta frequency from one reading to the next is then
computed. You take t
Hi
Depending on your definition of “accuracy”, and the actual device, the answer
is likely
in the 1 ppb to 10 ppt range based on a 10 second measurement.
What’s going on?
First up you have the basic accuracy of GPS. Over many days of averaging (with
a fairly
fancy averaging device) that can b
Hi Donald --
Over a 10 second interval, you're really looking at the short term
stability of the oscillator in the GPSDO, which could vary be several
orders of magnitude. The GPS component will set the nominal frequency,
but the noise around nominal will be that of the OCXO.
A quite good GP
Not sure what you mean by "accuracy over a 10 sec interval". If you mean
(in)correctness of frequency averaged over a given 10 sec interval, it's
more
like a few parts in 10^9. But if you mean stability of frequency without
regard
for its correctness, you might see your 2 parts in 10^12 in at lea
Can any list member please tell me the "accuracy" that can be expected from
a typical GPSDO
over, say, a 10 second interval? I have several measuring instruments
connected to my Trimbal GPSDO, and would like to know what to expect. At
the moment I am guessing about 1 to 2 parts in 10^12.
Thankyou,.
