Products > Test Equipment
Thunderbolt® E GPS Disciplined Clock
dr.diesel:
This thread, and the early morning reading it spawned; leapsecond.com/time-nuts/ke5fx really has me interested! I bought a Thunderbolt several years ago, not sure on the type but it was originally housed in a plug-in backplane type metal enclosure. I whacked the board into a 2U rack case, mounted the antenna outside but never did any real testing or configuration due to the LH being windows only (runs OK under wine). However reading today I see that has changed, there is now a native Linux beta version available! WooHoo.
Anyhow, on to further reading/tweaking :-+
Dr. Frank:
on time-nuts, September, there has been a discussion about TBolt performance, regarding stability (ADEV) and absolute frequency uncertainty.
branadic, I don't know, what you're after?
This subject: Tbolt issues may fit here:
https://www.febo.com/pipermail/time-nuts/2016-September/subject.html#start
TvB made some comparisons between GPSDOs, and I assume, he uses his MASER as reference: http://www.leapsecond.com/pages/gpsdo/
He uses the Time-Pod as a T.I. comparator, and for sure the TimeLab software.
What can be extracted from his measurements, that he obviously uses TC=100sec, or 1000s, because that's where you see a hump in the Allan diagrams.
Dr. Diesel, you live in beautiful countryside, couldn't resist to spy your coordinates.. ;D ;D ;D
Very similar to northern Germany, btw.
In LH, I think your ADEV value for the 10MHz output is an order of magnitude too high.
I achieve ADEV on the order of 2E-9 @ tau = 1.
Your GPS antenna rod is also visible, maybe the foliage of the trees might distract the signal. Perhaps you better choose > 20° elevation.
Frank
uncle_bob:
--- Quote from: Dr. Frank on September 06, 2016, 11:14:51 am ---on time-nuts, September, there has been a discussion about TBolt performance, regarding stability (ADEV) and absolute frequency uncertainty.
branadic, I don't know, what you're after?
This subject: Tbolt issues may fit here:
https://www.febo.com/pipermail/time-nuts/2016-September/subject.html#start
TvB made some comparisons between GPSDOs, and I assume, he uses his MASER as reference: http://www.leapsecond.com/pages/gpsdo/
He uses the Time-Pod as a T.I. comparator, and for sure the TimeLab software.
What can be extracted from his measurements, that he obviously uses TC=100sec, or 1000s, because that's where you see a hump in the Allan diagrams.
Dr. Diesel, you live in beautiful countryside, couldn't resist to spy your coordinates..
Very similar to northern Germany, btw.
In LH, I think your ADEV value for the 10MHz output is an order of magnitude too high.
I achieve ADEV on the order of 2E-9 @ tau = 1.
Your GPS antenna rod is also visible, maybe the foliage of the trees might distract the signal. Perhaps you better choose > 20° elevation.
Frank
--- End quote ---
Hi
There is virtually nothing at all on Time Nuts about the version of the Thunderbolt that the OP has. Trimble made several units under the same name. The old ones come with revision codes on them and some revisions go up to E. That is not at all the same thing as a "Thunderbolt E".
Bob
Dr. Frank:
--- Quote from: uncle_bob on September 06, 2016, 11:43:27 am ---
Hi
There is virtually nothing at all on Time Nuts about the version of the Thunderbolt that the OP has. Trimble made several units under the same name. The old ones come with revision codes on them and some revisions go up to E. That is not at all the same thing as a "Thunderbolt E".
Bob
--- End quote ---
That's correct, the TB 'E' is not available on the 2nd hand market yet.
Anyhow, this discussion applies to all versions of TBs, and also to all kind of of GPSDO.
Frank
uncle_bob:
--- Quote from: Dr. Frank on September 06, 2016, 11:56:20 am ---
--- Quote from: uncle_bob on September 06, 2016, 11:43:27 am ---
Hi
There is virtually nothing at all on Time Nuts about the version of the Thunderbolt that the OP has. Trimble made several units under the same name. The old ones come with revision codes on them and some revisions go up to E. That is not at all the same thing as a "Thunderbolt E".
Bob
--- End quote ---
That's correct, the TB 'E' is not available on the 2nd hand market yet.
Anyhow, this discussion applies to all versions of TBs, and also to all kind of of GPSDO.
Frank
--- End quote ---
Hi
The OP was pretty specific about having an E and looking for info on it. All of the stuff that does not apply at all to that unit has not helped much ....
Bob
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