On 10/27/20 6:16 PM, Tom Van Baak wrote:
Alberto,
Thanks for asking. The correct spelling is Allan variance or Allan
deviation, named after David Allan, of NBS (NIST). Yes, on rare
occasions it is misspelled Allen, as in the hex key wrench. Note it's
spelled correctly in the Subject line of
Alberto,
Thanks for asking. The correct spelling is Allan variance or Allan
deviation, named after David Allan, of NBS (NIST). Yes, on rare
occasions it is misspelled Allen, as in the hex key wrench. Note it's
spelled correctly in the Subject line of this thread. I'm not aware of
national
On 10/27/20 11:00 AM, Alberto di Bene wrote:
On 2020-10-27 17:38, Andy Talbot wrote:
They use Allen variance, TDEV and MTIE plots.
Is "Allen variance" just the British way of spelling "Allan variance",
or are they two different things ?
73 Alberto I2PHD
It's David Allan's name, and
On 2020-10-27 17:38, Andy Talbot wrote:
They use Allen variance, TDEV and MTIE plots.
Is "Allen variance" just the British way of spelling "Allan variance", or are
they two different things ?
73 Alberto I2PHD
___
time-nuts mailing list --
On another thread, G3YSX described this technique :
Taken in conjunction with the Wikipedia entry it begins to make sense here.
...
"A note on this thread: plotting phase against time will tell you a lot
about the effect of propagation on phase, but it is not the
Hi
Indeed this *is* a very fundamental problem in doing this sort of work.
The test setups and references generally are way harder to set up (and
more costly) than the design and construction of this or that device.
Indeed, as part of a normal design process on a GPSDO, the testing /
tweaking
Hi,
I'd like to add a comment.
What is ADEV?
It is the replacement for standard deviation as we attempt to measure
the frequency of a source using a frequency estimation based on two
phase-samples with some time distant tau between them. Thus, it shows
the frequency stability for a 2-point
Thanks Bob. Slowly it penetrates..
The 1PPS source is as you say far from being a good reference, so I will
cease that route!
I think I have to accept what I have - I believe it is good enough for my
Ham Radio work as a reference for my radios, at least into the low GHz
region.
If I manage less
Hi
What are we trying to measure with ADEV?
On a frequency source, it’s used to measure the noise of that source. Mostly we
put up plots of ADEV to show how quiet our source is. (Yes, we might also
measure
noise floor or amplifier contributions ….).
That’s the statistics part. Now for the
Where I worked we had a few of a later model Rapco 1804 (1804 L26 D2) which
had an LPRO Rubidium inside, and gave out 10MHz. That had an eight-channel
Trimble receiver, but I'm afraid I can't remember the model number.
I wasn't very impressed by the disciplining algorithm which, once it had
Hi Chris,
I posted a manual to mediafire some time back, have just checked and the link
is still working..
http://www.mediafire.com/file/5evbveha6pccc1l/Rapco_1804M_1882M.pdf/file
This is a combined manual for the 1804M MK2 GPSDO and 1882M2 MK2 distribution
amp, both black
fronted
Bob and Tom,
Thanks again for your time on this. I understand a lot better, and have
just one issue I would like to 'harp' on a little, if you would allow..
In the simplistic example of a freq counter measuring its own reference, It
it easy to grasp and understand the incestous nature of the
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