Bruce wrote:
And I'm still amazed I lucked out with the rubidium module.
Actually, the unit's PN and ADEV performance would almost certainly be
considerably better with a good OCXO instead of the Rb.
At low tau, the PN and ADEV performance of a GPSDO is determined by the
local oscillator
Somebody else actually has a GPStar (Odetics) and working?
My units stopped working about 4 months ago. They are circa 1994 as I
recall. Had 2 neither would work. Have one now as I used the case and rack
mounts for another project.
These are much older then what you have as the GPS receiver is
After many moons, my trusty GPStar 365 (updated to a 565 through
firmware and a receiver change) finally bit the dust. Symptom: It kept
flipping between 'Coasting' and 'Recovering,' never quite reaching
'Locked.' The DAC value either ended up maxed (65534) or min'd (0).
https://tf.nist.gov/general/pdf/2995.pdf
may be also of some interest.
Its about optimising the linearity of high speed photodiodes.
These are used (amongst other applications )as mixers for converting optical
combs to microwave signals.
Bruce
> On 05 June 2020 at 11:35 Bill Byrom wrote:
>
>
Thanks, Bruce! That's a copy of that same Science article. I guess that NIST
got permission to post it on their website, since they were the sponsor of the
study.
--
Bill N5BB
On Thu, Jun 4, 2020, at 6:32 PM, Bruce Griffiths wrote:
> https://tf.nist.gov/general/pdf/3093.pdf
> is likely more
https://tf.nist.gov/general/pdf/3093.pdf
is likely more accessible than the sciencemag link
Bruce
> On 05 June 2020 at 11:15 Bill Byrom wrote:
>
>
> This was published in the 22 May 2020 issue of Science (AAAS journal). For
> AAAS members, the direct link is:
>
This was published in the 22 May 2020 issue of Science (AAAS journal). For AAAS
members, the direct link is:
https://science.sciencemag.org/content/368/6493/889
They make use of a fiber-based OFC (optical frequency comb) and
state-of-the-art photodetectors to transfer optical clock stability
I've got a pair of 125 Mhz osc that I would like to see if someone
could measure the noise profile on. I would be willing to pay for the
inconvenience if someone was willing.
The first oscillator is a W6PQL design with an integrated OCXO. The
crystal was a low PN type designed for OCXO
