Tom
That is one thing I noticed even without the CS the system is very stable
with the Xtal.
My comment was tagging on to a previous one and I couldn't resist the fact
that I get might old stuff.
Good comment on the standard. Indeed I run my 5065 every month or so for a
day or two insuring its
Before this indelible conversation goes too far, note that cesium beam
frequency standards are explicitly included on the U.S. ITAR list under
§121.IV.28 and that, under §120.10.a, this prohibits the dissemination of
(1) Information, other than software as defined in § 120.10(d), which is
Hi,
I can get a 00105-6013 xtal oscillator that is the type used in the
5051A and 5065 standards. Does it worth for a standalone frequency
standard or the more modern compact types such the miniature units from
the telco towers salvage coming from China are more convenient?
I realize that I
In your dreams.
There was a very nice HP Cs there a few years ago, but it had a properety
tag that I recognized. I knew that unit had a known bad Cs tube, as I seen
it at a company surplus sale a month before, but that didn't stop the guy
hawking it as working for well over $5K.
Caveat Emptor!!
On Fri, January 14, 2011 12:02 am, Bruce Griffiths wrote:
Kernco, Symmetricom.
Interesting reference, I was not previously familiar with Kernco.
The description of their Coherent Population Trapping method rubidium
standard says that the laser diode is frequency modulated to generate two
Hi,
From: Robert Lutwak rlut...@gmail.com
Before this indelible conversation goes too far, note that cesium beam
frequency standards are explicitly included on the U.S. ITAR list under
§121.IV.28 and that, under §120.10.a, this prohibits the dissemination of
:-)
Hi!
By modulating the laser diode current you can modulate the diode
temperature. And that changes the wavelength.
- Henry
--
ehydra.dyndns.info
Chris Caudle schrieb:
On Fri, January 14, 2011 12:02 am, Bruce Griffiths wrote:
Kernco, Symmetricom.
Interesting reference, I was not
Hi
The 105 oscillator is a nice OCXO. I certainly would not throw one away.
There are indeed better parts out there. It all depends on what you are
trying to do.
The phase noise of the unit is not as good as some of the 10 MHz stuff. I
would not base a microwave synthesizer on one. It's short
Hi
Through the flips and flops of HP = Agilent = Symmetricom various products
have changed badges and locations. They appear to be consolidating cesium
standard production at the old FTS plant in Beverly(?) MA. Ultimately I
suspect they will redesign the product line to rationalize it. That
Hi
I suspect you are a lot more likely to come up with a new tube by talking to
Bert before he gets rid of his inventory
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul swed
Sent: Friday, January 14, 2011 9:10 AM
To: Tom
On 01/14/2011 07:24 PM, Bruce Griffiths wrote:
ehydra wrote:
Hi!
By modulating the laser diode current you can modulate the diode
temperature. And that changes the wavelength.
- Henry
At 3.4GHz??
Modulation at 3.4 GHz required by an Rb standard so that the frequency
difference between the
Hi
I've seen some 10811's in GPSDO's that take many weeks to settle below 3.0 x
10^-10 per day. It's rare to see one that's been on power recently behave
that way. The ones I'm looking at have been off power for years and stored
in an outdoor shed (no heat / cooling / humidity control).
Bob
From working on a few dozen 5370's with the oven oscillator option I can tell
you that an oscillator that had been powered off for a long time (months to
years) takes at least a couple of months to settle in. And 10544's behave
quite a bit better than 10811's when it comes to aging.
On 1/14/11 6:55 AM, Robert Lutwak wrote:
Before this indelible conversation goes too far, note that cesium beam
frequency standards are explicitly included on the U.S. ITAR list under
§121.IV.28 and that, under §120.10.a, this prohibits the dissemination of
(1) Information, other than software
On 1/14/11 8:12 AM, Jean-Louis Noel wrote:
Hi,
From: Robert Lutwak rlut...@gmail.com
Before this indelible conversation goes too far, note that cesium beam
frequency standards are explicitly included on the U.S. ITAR list under
§121.IV.28 and that, under §120.10.a, this prohibits the
In message 4d30be89.8050...@earthlink.net, jimlux writes:
On 1/14/11 8:12 AM, Jean-Louis Noel wrote:
Sadly, it has been made abundantly clear to me and my colleagues that
merely because something is published in the open literature does not
make it export-control free. We are specifically
Hi
Well that crosses off any discussion of Tang as a breakfast drink
(You would indeed need to be fairly old to remember the TV commercials
selling it based on it's space connection).
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Hi
Not to mention some conversations to the effect that indeed ITAR did force
the Russians to develop their own Space qualified Cs standards.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: Friday, January
Hi,
From: jimlux jim...@earthlink.net
pretty much anything in space is a defense article)
I can't imagine they could have done such mistake!
http://www.dtic.mil/cgi-bin/GetTRDoc?Location=U2doc=GetTRDoc.pdfAD=ADA509345
(second page)
http://tycho.usno.navy.mil/ptti/ptti2001/paper2.pdf
Bye,
On Fri, January 14, 2011 3:44 pm, Magnus Danielson wrote:
What they actually do is set the DC current for wavelength and AC
modulate at 3.4 GHz for locking frequency. It's obvious if just looking
into one of the papers I linked earlier.
Which somewhat gets back to my original question.
I
Thank you Bob,
I think I'll get it, just to have another quality oscillator. About its
aging I think it is new, probably a spare unit. since there are not
signs of any solder on the pins.
Best regards,
Ignacio
El 14/01/2011 18:11, Bob Camp escribió:
Hi
The 105 oscillator is a nice OCXO.
On Jan 14, 2011, at 1:45 PM, Bob Camp li...@rtty.us wrote:
Hi
Well that crosses off any discussion of Tang as a breakfast drink
(You would indeed need to be fairly old to remember the TV commercials
selling it based on it's space connection).
Bob
Tang is a good example of a
Tang was a WMD (Weapon of Massive Disgust) in and of itself.
-John
On Jan 14, 2011, at 1:45 PM, Bob Camp li...@rtty.us wrote:
Hi
Well that crosses off any discussion of Tang as a breakfast drink
(You would indeed need to be fairly old to remember the TV commercials
On Jan 13, 2011, at 5:18 PM, Rick Karlquist wrote:
The other problem for the garage builder is that one of the Rb
isotopes is slightly radioactive. Probably not OK to have
in your garage.
I used to perform Rb/Sr geochronology wet bench chemistry in
college. Rb-87 has a half-life on
I used to perform Rb/Sr geochronology wet bench chemistry in
college. Rb-87 has a half-life on the order of ~48.8 billion years.
Several multiples of the estimated age of the universe. The
potassium-40 in your own body is a much greater threat, followed by
C-14, and various natural
I think any pure alkali metal basically has to be handled in a good vacuum
and moved around by distillation. It's easy enough as you are concerned
with grams, at most, not pounds of the stuff.
-John
You obviously didn't see the Myth Busters episode where they used
several pounds of sodium to
Magnus Danielson wrote:
On 01/14/2011 07:24 PM, Bruce Griffiths wrote:
ehydra wrote:
Hi!
By modulating the laser diode current you can modulate the diode
temperature. And that changes the wavelength.
- Henry
At 3.4GHz??
Modulation at 3.4 GHz required by an Rb standard so that the
The RB-87 isotope used in Rubidium standards is radioactive, but at such
a slight activity level that special procedures and shielding must be
used to measure it. Any chunk of granite, including your fancy kitchen
counters, far outshines RB-87 as a radiation source! A garage built
Rubidium
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