You can find it at
http://www.ecnmag.com/blogs/2012/11/its-about-time-timing-and-frequency-issues-engineering
Simon
Engineering is the art of making what you want from what you can get at a
profit.
___
time-nuts mailing list --
Dear Edgardo,
On 14/11/12 04:37, Edgardo Molina wrote:
Dear Azelio, Tom, John and Luciano ( I hope I am not missing anybody),
Thank you all of you for your kind advise on this subject. I am sorry I was
unable to reply in a timely manner. I had to leave town for a week for new IT
business. I
Hi Edgardo,all,
the command to blank the display you can find:
http://cp.literature.agilent.com/litweb/pdf/53131-90044.pdf
page 3-36
Disable display:
:DISPlay:ENABle OFF (See Note below.)
Note: This value is not stored on Save and is not part of the
non-volatile state.
Hope this command
Hi
If you go shopping for a parts donor, a 53181 is probably going to be much
cheaper. Most of the parts that burn out are common between the models.
Bob
On Nov 13, 2012, at 10:37 PM, Edgardo Molina xe1...@amsat.org wrote:
Dear Azelio, Tom, John and Luciano ( I hope I am not missing
I suspect it will work fine; worst case might be that you add a 3dB
attenuator, but I doubt you'll need it. I would test, if you can, to
see whether the output jitter varies between the full input level and
something that's closer to 1-2V p-p.
John
On 11/13/2012 9:52 PM, Edgardo Molina
The frequency accuracy is related to the conversion process, the sampling
process and the computation that follows. In a sampling VNA the frequency
is extracted after the FFT, I suppose, so I don't think that sampling VNAs
can do any better than a real frequency counter. Sweeping spectrum
In the link that Simon mentions the Costas loop is discussed. In 1956 when
I was 14 and a SWL listener there was a AM technical net on 75 meters.
Every Sunday afternoon there was a visiting engineer ham or otherwise giving
a lecture. I remember John giving his on a DSB process that he was
Simon
I have one solution cooking for wwvb and testing right now will release
details maybe today. Its not perfect but seems to be doing a good job and
is low in cost. Fix 1 rcvr and then you can use its output to drive all
others. You may have seen some of my updates on Time-nuts.
That said I am
Do Rb oscillators wear out? I have found:
There are no “wear-out” or “use-up” mechanisms in a Datum
Efratom Rubidium oscillator.
-- Datum - Note About Rubidium Oscillators
and
Atomic Vapor Oscillators have no wear out mechanism.
-- FEI - Precison Oscillator Overview, 2007, p19.
But also:
From what's been reported here, the mechanism isn't consumption of the
Rb, but rather deposition of material on inside of the bulb, reducing
its intensity, and that can sometimes be reversed by tricks that some
time-nuts have reported -- it's more of a maintenance rather than a
wear-out issue.
Hello,
There are no ?wear-out? or ?use-up? mechanisms in a Datum
Efratom Rubidium oscillator.
(..)
But also:
Unlike a quartz crystal oscillator which has no clearly-defined wear out
period and, if well-designed, can actually improve as time goes on, a Rubidium
reference has a definite
Hi
In a Cs beam tube, you start with a bucket of metal at one end of the tube.
You shoot it towards the other end of the tube. When you have shot it all,
the tube stops working. That's a well defined wear-out or use-up
mechanism.
The comparison they are making is to a Cs beam tube.
Bob
Am 14.11.2012 06:41, schrieb Tom Knox:
Hi Edgardo;
I have been looking for a part number and source. There was a part number
posted but it was for the 34401A which is slightly different. I will post
price and availability if I find them.
Best Wishes;
Thomas Knox
Hi Edgardo,
I bought my
Thanks Arnold the more information on this issue the better. I will take a look
at your links.
Regards,
Edgardo Molina
Dirección IPTEL
www.iptel.net.mx
T : 55 55 55202444
M : 04455 10045822
Piensa en Bits SA de CV
Información anexa:
CONFIDENCIALIDAD DE INFORMACION
Este mensaje
Thank you John, If I test as you mention I will share the results.
Regards,
Edgardo Molina
Dirección IPTEL
www.iptel.net.mx
T : 55 55 55202444
M : 04455 10045822
Piensa en Bits SA de CV
Información anexa:
CONFIDENCIALIDAD DE INFORMACION
Este mensaje tiene carácter confidencial. Si
Thanks to everyone who responded on the list and/or took the time to read my
article.
I look forward to getting more information from those of you who are working on
tracking the phase of the new WWVB signal. I will be writing it up as soon as a
design (or designs) are solid.
In terms of
Bob,
Modern Rubidium units like the PRS10 Have a lamp life of over 20 years
(of continuous operation).
Vintage HP 5065A units likewise had a very long lamp lifetime.
All the other common failures are just in the electronics.
The main interest for time nutters is how long will the lamp last in
On 11/14/2012 10:26 PM, cdel...@juno.com wrote:
Bob,
Modern Rubidium units like the PRS10 Have a lamp life of over 20 years
(of continuous operation).
Vintage HP 5065A units likewise had a very long lamp lifetime.
All the other common failures are just in the electronics.
The main interest
On 11/14/2012 06:58 PM, Arnold Tibus wrote:
Am 14.11.2012 06:41, schrieb Tom Knox:
Hi Edgardo;
I have been looking for a part number and source. There was a part number
posted but it was for the 34401A which is slightly different. I will post price
and availability if I find them.
Best
I believe Corby came up with the bulb rejuvenation.
If you tried to get a new bulb for a FRK, they wanted $400 in the late
1990s for them.
Several rubidium's are plentiful and cheap, it may be easier to buy one
from the auction site.
I have a HP5065A, I run it when I need it, and when not
Hi
There are several different basic Rb cell designs. The old large cell designs
had relatively little trouble with glass / metal interaction. The early small
cell designs tended to turn the bulbs black over time. Newer small cell designs
seem to have gotten past that problem.
Bob
On Nov 14,
Bob,
Which category do the FE-5680A's fall into?
Dale
NV8U
-Original Message-
From: Bob Camp
Sent: Wednesday, November 14, 2012 6:28 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Confused about Rubidium oscillators
Hi
There are several
Hi
The FE 5680's appear to have the more modern miniature tubes in them.
Bob
On Nov 14, 2012, at 7:39 PM, Dale J. Robertson d...@nap-us.com wrote:
Bob,
Which category do the FE-5680A's fall into?
Dale
NV8U
-Original Message- From: Bob Camp
Sent: Wednesday, November 14, 2012
Dear Group,
Now that I have setup TimeLab along with the Prologix GPIB to USB adapter and
the HP-53132A frecuency counter, I am starting to get some data from my
frequency standards. Still I think I have a long way to go in front of me.
One of the main concerns that cross my mind at this point
Hi, Edgardo --
Your counter's noise near t=1s will dominate most measurements you're likely
to make, so there's nothing to be gained by acquiring data at even faster
rates. This will probably be true out to at least 10-100 seconds or even
longer, depending on what you're measuring.
For best
Edgardo, the minimum sample rate in practice is determined by the noise floor
of the measurement system. I would suggest that you do a baseline test by
measuring the counter reference against itself with a tau0 (sample rate) of 1
second. You'll see a best-case result and from it you can
Hi Edgardo,
however, the 53132A is considerably more sensitive in frequency mode as
we have recently discovered.
I saw an astoundingly low ADEV noise floor of some 6E-13 at t=10 sec as
opposed to only 2.5E-11 in TI mode.
I don't have a 53132A, only a 53131A that I don't use anymore for ADEV,
Hi Edgardo,
however, the 53132A is considerably more sensitive in frequency mode as
we have recently discovered.
I saw an astoundingly low ADEV noise floor of some 6E-13 at t=10 sec as
opposed to only 2.5E-11 in TI mode.
I don't have a 53132A, only a 53131A that I don't use anymore for
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