On 11/28/21 8:03 PM, Tom Van Baak wrote:
Jim,
For state of the art numbers and plots, here's a recent (2020) paper:
"A Review of Contemporary Atomic Frequency Standards",
by Bonnie Schmittberger, David Scherer
https://arxiv.org/abs/2004.09987
https://arxiv.org/pdf/2004.09987.pdf
It also has pl
Jim,
For state of the art numbers and plots, here's a recent (2020) paper:
"A Review of Contemporary Atomic Frequency Standards",
by Bonnie Schmittberger, David Scherer
https://arxiv.org/abs/2004.09987
https://arxiv.org/pdf/2004.09987.pdf
It also has plots comparing clock stability vs. size and
Hi,
I've got a 10 MHz distribution amplifier and am considering purchasing a
5 MHz reference. Most (not all) of my equipment accepts a 5 MHz
reference, but I'd like to be able to use the existing distribution
amplifier I have if possible. Therefore, I'm considering ways I might
generate a low-nois
I forgot the URL
http://g4jnt.com/10MHzDist.pdf
Andy
www.g4jnt.com
On Sun, 28 Nov 2021 at 18:39, Andy Talbot wrote:
> The way I look at short term stability is to multiply up to microwave
> frequencies then mix the two and look at the resulting beat note. The
> popular ADF4351 Fract-N synth
With that offset either the oven set point has changed or there has een a
component value shift in the oscillator circuit.
The easiest way to test is to stick in another 10811 if available.
You could also install one of the original 105 style oscillators if you
have one.
Cheers,
Corby
___
Hi,
I'm also one of those fascinated by Project Great and this was The project
inspired me to start with time related stuf.
Can Cs clock be avoided by prolonged period at high altitudes? Assume you can
spend a month at the summit. Is e.g. the Rb drift stable enought to compensate
and obtai
Am 28.11.21 um 18:37 schrieb Bernd Neubig:
-Jim wrote-
I wouldn't actually think there's a Cs on ISS. What purpose would it serve? We as
time-nuts think "of course you'd have a precise source of time", but really,
there's not much need for timing on ISS on a scale smaller than seco
On 11/28/21 9:37 AM, Bernd Neubig wrote:
-Jim wrote-
I wouldn't actually think there's a Cs on ISS. What purpose would it serve? We as
time-nuts think "of course you'd have a precise source of time", but really,
there's not much need for timing on ISS on a scale smaller than seconds,
The way I look at short term stability is to multiply up to microwave
frequencies then mix the two and look at the resulting beat note. The
popular ADF4351 Fract-N synthesizer is ideal for this. Take two of them,
and programme for two frequencies in the GHz region a 1kHz or so apart when
driven
The 2100, normally, supplies +5V bias. It can be modified to do
+12V, though it's tricky.
+5 is a safe bet for most antennas. If the Lucent unit was made in
the 90's-early 00's, you should be fine (I don't have any data on that
specific number, though).
Keep the peace(es).
On 2
Hi
The AR-60A is a pretty good “telecom” grade Rb. Depending on which one
you have it will have a 1 second ADEV in the 5x10^-12 (rare) to 1.5x10^-11
range.
Once you get inside the 1 second range on any Rb, the ADEV is going to be
dominated by the OCXO in the device. The telecom grade units are
As the collection of frequency sources and counters in my home lab is
growing I'd like to understand the performance of the frequency sources.
Two different GPSDO do help to check long term stability.
But the Rubidium frequency standard I have (Accubeat AR60A) is fairly
unknown and seemingly not
-Jim wrote-
I wouldn't actually think there's a Cs on ISS. What purpose would it serve?
We as time-nuts think "of course you'd have a precise source of time", but
really, there's not much need for timing on ISS on a scale smaller than
seconds, if that. NTP to timestamp files, for ins
Hi Folks,
Would like to donate an external GPS antenna for the TS2100 at the local
radio astronomy site.
Anyone know what voltage the Lucent 849143995 GPS antenna is and if it's
suitable for the TS2100?
Martin A Flynn / W2RWJ
Computer Deconstruction Laboratory
2201 Marconi Road
Wall Townshi
Two HP 5065A on ebay in Germany Bert Kehren
https://www.ebay.com/itm/353785283417?hash=item525f3f0359:g:~GkAAOSwNgZhoODS
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On 11/28/21 2:11 AM, Andy Talbot wrote:
I would imagine there are already several caesium clocks on board the ISS,
anyway.
Don't forget there is a velocity component in relativistic time shift, as
well as gravitational, so using a moving platform like an aircraft or the
ISS complicated things a l
On 11/27/21 11:08 PM, Tom Van Baak wrote:
Hi Thomas,
Good to hear the experiment was contagious for you. If you have
additional questions let me know.
Your suggestion about Mount Evans and Pikes Peak are excellent. You
will enjoy this 2017 paper:
"An Undergraduate Test of Gravitational Tim
Being curious here: has anyone ever taken a Cs in a submarine? E.g. the
Marianatrench or so?
As a native from a mountain-deprived country I could not help wondering.
Wilko
> On 28 Nov 2021, at 08:14, Tom Van Baak wrote:
>
> Hi Thomas,
>
> Good to hear the experiment was contagious for you.
Hi Bob,
thx a lot. Now I can keep it on my list and try to get it on the second Hand
market in a couple of years 😉. Its a bit too much for my hobby budget. I am
only interested in the Audio frequences below 50mhz range, so GHz is not
important at the Moment for me
Kind regards
Norman
Gesendet
Hi
Either the 10811 is on frequency or it needs to be swapped out. If it’s a
10811, they
are available on eBay for $50 if you shop. You might have to buy two or three
at that
price to get a really good one. That’s no different from paying $200 for them
…..
If the oven has died, it will be appa
If you are in Germany the Zugspitze at 2962 meter and Garmisch 700 meter would
be perfect. Good amenities at both locations.
I would imagine there are already several caesium clocks on board the ISS,
anyway.
Don't forget there is a velocity component in relativistic time shift, as
well as gravitational, so using a moving platform like an aircraft or the
ISS complicated things a lot
Andy
www.g4jnt.com
On Sun, 28 Nov 2
Is the ISS a suitable platform?
I expect getting the experiment package on there would be quite another matter!
DaveB, NZ
-Original Message-
From: Tom Van Baak [mailto:t...@leapsecond.com]
Sent: Sunday, November 28, 2021 20:09
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: Project
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