Tom,
Thanks very much, that's a great list and will keep me busy for some time.
At the hobbyist level, are there time interval counters or frequency
counters that are particularly popular, and/or that pair well with the
listed software?
Frank
On 3/25/20 2:30 PM, Tom Van Baak wrote:
Frank,
The software that most of us use to create Allan deviation plots is
free and not that hard to use.
You will need ascii numerical phase or frequency data, e.g., from a
time interval or frequency counter.
1) Stable32, by Bill Riley
See:
https://ieee-uffc.org/frequency-control/frequency-control-software/stable32/
Documentation and a goldmine of T&F information: http://www.wriley.com/
2) TimeLab, by John Miles
http://www.ke5fx.com/timelab/readme.htm
Documentation and tutorials:
http://www.miles.io/PhaseStation_53100A_user_manual.pdf
3) Allan deviation for Python, by Anders Wallin
https://pypi.org/project/AllanTools/
4) Command line tools for ADEV
adev_lib.c, adev4.c, adev5.c in my http://leapsecond.com/tools/
directory.
5) Excel, gnuplot, etc.
Any software that generates log-log plots can be used to make ADEV
plots. You first calculate the statistics using CLI tools and then use
the GUI to make the plots. This gives maximum flexibility in plotting
clarity and style but requires more work than canned packages like
Stable32 or TimeLab.
Normally I recommend TimeLab to new users, but I'm run into VBA and
Excel wizards who are proficient in that environment.
6) Plotter, by Ulrich Bangert
Still used by some time nuts, maybe "not recommended for new design",
since Ulrich is no longer with us.
/tvb
On 3/25/2020 1:44 PM, Frank wrote:
Big thanks to Attila, Frank, and Taka for your responses to my
questions on my Trimble Thunderbolt.
I'm inclined to follow Taka's advice and reset the antenna elevation
mask angle with LH's FE command to something between 10 and 20
degrees. I'm guessing that this is entered in degrees (i.e. "15"),
but I can't find anything in the LH documentation to verify this, so
if it's wrong I'm happy to be corrected. Also, as noted I set the
satellite signal level mask to 1 with LH's FL command, but short of
doing a full reset of the Thunderbolt I'm having trouble figuring out
what the default value is for this.
I appreciate Attila's and Frank's suggestions on topics to study such
as Allan deviation to dip more toes into metrology. I've started in
on this, though I imagine it will take a while to work through. For
now, I wanted to throw out one follow-up question. I see that ADEV
diagrams plotting Allan deviation against time seem to be a primary
tool for evaluating GPSDO performance. If I wanted to compare the
Thunderbolt to another GPSDO (for example, I also have a Bodnar
unit), is there software not wildly beyond a hobbyist budget that
would allow me to compile and display similar data?
Thanks again,
Frank
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