Hi,
I've took the time to read carefully your long and detailed message Magnus and
this was very interesting. I've learned many things that have enabled me to
investigate further. Ah yes, you're right saying that the more you fall into
these things, the more you discover that you have to
Hi -
I agree with what you stated, however, I am not sure that at real low levels
they are actually discernible. Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts
I have a page that illustrates how you can use a delay line and a mixer to
separately obtain AM and PM
http://www.ko4bb.com/Timing/Phase_Detector
Didier KO4BB
On January 14, 2015 1:19:11 PM CST, Mike Feher mfe...@eozinc.com wrote:
At those low levels, how does one differentiate between phase
Bob -
What I am saying is, even at the levels you mentioned, what is measured is I
believe the combination of phase and AM. In other words, you are just measuring
noise, but, are not certain if it is all phase, or phase plus some AM. At least
that is my recollection when I was heavily involved
Hi
I guess the question becomes how low is low.
If it’s a 50 ohm system
If the power level is rational
If you are at room temperature
There are some limits on how low low can be.
You have a -174 dbm / Hz thermal floor. AM or PM noise can only be 3db better
than the thermal floor. At a
At those low levels, how does one differentiate between phase or AM noise?
Thanks Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 office
908-902-3831 cell
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce
Interestingly they use regenerative dividers.
Pretty good read.
Thanks
Paul
WB8TSL
On Tue, Jan 13, 2015 at 4:49 PM, Tom Knox act...@hotmail.com wrote:
I think the key to this concept is an optical comb filter.
Archita Hati of the Phase Noise measurement Group at NIST has been
researching
Hi
More or less by definition:
AM noise has the sidebands in phase, PM noise has the sidebands out of phase.
PM adds to no envelope power, AM adds to the envelope power. If you have purely
random noise, half of the power is AM, half is PM by this approach. If you have
what is effectively a
On 01/13/2015 11:41 AM, Attila Kinali wrote:
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell gmaxw...@gmail.com wrote:
On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali att...@kinali.ch wrote:
Seems that the state of the art in stabilized lasers has improved a
lot lately, e.g. there are
Although the phase noise when using optical combs to generate Rf signals
is low there is no mention of the am noise.
Bruce
On Tuesday, January 13, 2015 02:49:33 PM Tom Knox wrote:
I think the key to this concept is an optical comb filter.
Archita Hati of the Phase Noise measurement Group at
Dr David Kirkby
Managing Director
Kirkby Microwave Ltd
Registered office: Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3
6DT, United Kingdom
Registered in England and Wales as company number 08914892
http://www.kirkbymicrowave.co.uk/
Tel 07910 441670 / +44 7910 441670 (0900-2100 GMT)
On 13
I think the key to this concept is an optical comb filter.
Archita Hati of the Phase Noise measurement Group at NIST has been
researching ultra low phase noise 5MHz references using an optical standard and
comb filter
as well as extensive RF components to down converting to the desired
On 12 January 2015 at 12:34, Attila Kinali att...@kinali.ch wrote:
Hi,
I just stumbled over this [1] nice article by Fritz Riehle that might be
of interest to others as well.
Attila Kinali
[1] Towards a Re-definition of the Second Based on Optical Atomic Clocks,
by
On 1/13/15 2:41 AM, Attila Kinali wrote:
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell gmaxw...@gmail.com wrote:
One exception here is space qualified oscillators. For those you
go to the JPL and ask them to help you.
Actually, you want to go to Applied Physics Labs (APL).. they're the
On Tue, 13 Jan 2015 19:37:05 +0100
Attila Kinali att...@kinali.ch wrote:
If you use a standard laser diode, these have a linewidth of
around 20-100MHz. If you provide them the slightest feedback,
they go down to 1MHz easily (ie just by adding some window glass
infront of the laser, that
On Tue, 13 Jan 2015 17:46:01 +
Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk
wrote:
Of course I'm not suggesting a HeNe would provide the stability of
cutting edge research laser optical clock, but they are easily within
the budget of a hobbyist and could be a bit
On Tue, Jan 13, 2015 at 5:46 PM, Dr. David Kirkby (Kirkby Microwave
Ltd) drkir...@kirkbymicrowave.co.uk wrote:
I had a brief read. Equation 1 made me wonder what could be achieved
with a cheap HeNe laser. It should be fairly easy to mix a couple of
See Sams Laser Faq section on stabalized HeNe
On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali att...@kinali.ch wrote:
I just stumbled over this [1] nice article by Fritz Riehle that might be
of interest to others as well.
I've seen less discussion of non-atomic stable optical oscillators.
Most (all?) of these optical atomic standards are
On Mon, 12 Jan 2015 20:09:45 +
Gregory Maxwell gmaxw...@gmail.com wrote:
On Mon, Jan 12, 2015 at 12:34 PM, Attila Kinali att...@kinali.ch wrote:
I just stumbled over this [1] nice article by Fritz Riehle that might be
of interest to others as well.
I've seen less discussion of
On Tue, 13 Jan 2015 17:46:01 +
Dr. David Kirkby (Kirkby Microwave Ltd) drkir...@kirkbymicrowave.co.uk
wrote:
I had a brief read. Equation 1 made me wonder what could be achieved
with a cheap HeNe laser. It should be fairly easy to mix a couple of
HeNe lasers on a photodiode and look at
THe stability /accuracy of lasers is entirely dependent on the cavity length.
Materials used are usually invar or silica, so you are no better off than
with a quartz crystals.
They are just a resonant cavity.
cheers,
Neville Michie
___
time-nuts
Hi,
I just stumbled over this [1] nice article by Fritz Riehle that might be
of interest to others as well.
Attila Kinali
[1] Towards a Re-definition of the Second Based on Optical Atomic Clocks,
by Fritz Riehle, 2015
http://arxiv.org/abs/1501.02068
--
It is upon moral
On Mon, 12 Jan 2015 13:34:03 +0100
Attila Kinali att...@kinali.ch wrote:
I just stumbled over this [1] nice article by Fritz Riehle that might be
of interest to others as well.
And while we are at it:
2e-18 total uncertainty in an atomic clock,
by T.L. Nicholson et.al., 2015
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