Hi Jack,
Great scan!
I was also most interested to see you had scanned the manual for another
HP reference that I have - the 5501B. With an accuracy of 1x10-7 and
stability of 2x10-8 it's not that great but the frequency is 473612.23
GHz! For those who have not caught on yet, the 5501B is a
Sheeesh!
Actually I use the 5501B for its intended purpose... I'm a bit of a precision
nut. Never seen an Allan variance plot of one.
I prefer 473.6057788309637 THz :)
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Robert Atkinson
Sent: Tuesday,
What about the Rubidium Fountain?
See first article in the Autumn 2005 report at link below.
http://www.npl.co.uk/publications/news/time/
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Normand Martel
Sent: 07 November 2006 00:29
To:
--- Poul-Henning Kamp [EMAIL PROTECTED] wrote:
A big cruise-boat needed to pass under a 400 kV line
on the river
Ems and to avoid trouble the turned it off during
the passage.
That resulted in overloads elsewhere and all the
cards came crashing
down.
Something tells me that the next
Seems very interesing!!!
If i'm right, That could lead to rubidium based
primary standards...
Normand Martel
--- Rob Kimberley [EMAIL PROTECTED] wrote:
What about the Rubidium Fountain?
See first article in the Autumn 2005 report at link
below.
John -
Thanks for the reminder. My Austron has been sitting here dormant for so
long that I totally forgot that it took 12. Out of the original pack, I
could only locate 9 cells, but, I bet I tossed some just because they were
so corroded. Obviously from the battery cavity within the unit, 12 is
From: Normand Martel [EMAIL PROTECTED]
Subject: Re: [time-nuts] Frequency processing scheme of HP5065 vapour rubidium
standard
Date: Mon, 6 Nov 2006 16:28:47 -0800 (PST)
Message-ID: [EMAIL PROTECTED]
--- Ulrich Bangert [EMAIL PROTECTED] wrote:
John,
offset that changed annually.
Magnus Danielson wrote:
There is frequency pulling even in Cesium beams. Only a few beams handles
the
phase error pulling by reverting the beam direction. Fountains have this
together with doppler reduction.
In the 5071, nearly every error source has been beaten into
submission. However, CBT
Seems very interesing!!!
If i'm right, That could lead to rubidium based
primary standards...
Normand Martel
Hi Normand,
There are many factors which pull cesium too; and if
you want to get technical the actual frequency inside a
typical cesium standard, even at sea-level, isn't exactly
From: Rick Karlquist [EMAIL PROTECTED]
Subject: Re: [time-nuts] Frequency processing scheme of HP5065 vapour rubidium
standard
Date: Tue, 7 Nov 2006 10:29:49 -0800 (PST)
Message-ID: [EMAIL PROTECTED]
Magnus Danielson wrote:
There is frequency pulling even in Cesium beams. Only a few beams
Magnus Danielson wrote:
What I have been thinking about is the possibility to electrically detune
the
microwave cavity to introduce the necessary phase shift control. The key
issue
with that would probably be how to detect the zero-phase shift in a
separate
loop not involving external
In message [EMAIL PROTECTED], Rick K
arlquist writes:
I can also tell you (having investigated this sort of thing)
that adding varactors to the cavity to tune it is a huge can of
worms that you want to avoid if at all possible.
Apart from being a can of worms, wouldn't it also be pointless ?
Jack Hudler wrote:
Sheeesh!
Actually I use the 5501B for its intended purpose... I'm a bit of a precision
nut. Never seen an Allan variance plot of one.
I prefer 473.6057788309637 THz :)
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Robert
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] HP 10811A/B OCXO OP/SRV manual is
onlineathparchive.com AND HP 5501B manual.
Date: Wed, 08 Nov 2006 11:25:44 +1300
Message-ID: [EMAIL PROTECTED]
To measure the Allan variance you need at least 2 (preferably more)
stabilised
Hi!
I have collected some hyperfine splittings into a table with references.
I was reminded of this when asked offlist for the Rubidium splitting frequency.
Naturally, I would welcome feedback and contributions of both better resolution
measures as well as more isotopes.
Hmm this sounds like YAP! (yet another project). I've have 6 HP5517B's (new
version of the 5501B) who output are to low to use. Yet they will phase lock.
Scale this up to 4.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Magnus Danielson
Sent: Tuesday,
---BeginMessage---
Magnus Danielson wrote:
From: Dr Bruce Griffiths [EMAIL PROTECTED]
Subject: Re: [time-nuts] HP 10811A/B OCXO OP/SRV manual is
onlineathparchive.com AND HP 5501B manual.
Date: Wed, 08 Nov 2006 11:25:44 +1300
Message-ID: [EMAIL PROTECTED]
To measure the Allan variance you
From: Normand Martel [EMAIL PROTECTED]
Subject: Re: [time-nuts] Frequency processing scheme of HP5065vapourrubidium
standard
Date: Tue, 7 Nov 2006 17:25:19 -0800 (PST)
Message-ID: [EMAIL PROTECTED]
Thanks! very interesting articles!!!
But something bugs me... In both fountains and single
But something bugs me... In both fountains and single
ion mercury standards, lasers are used to COOL DOWN
atoms...
How is it possible? Lasers are energy sources, and (at
least for me), anything that is hit by a laser will
get warm, not cold!
Thanks for your attention..
Normand Matrel
Hi!
I have collected some hyperfine splittings into a table with references.
I was reminded of this when asked offlist for the Rubidium splitting
frequency.
Naturally, I would welcome feedback and contributions of both better
resolution
measures as well as more isotopes.
Hmm. I think I have all the parts for this. Except the programmable polarizer.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf
Of Magnus Danielson
Sent: Tuesday, November 07, 2006 7:11 PM
To: [EMAIL PROTECTED]
Cc: time-nuts@febo.com
Subject: Re: [time-nuts]
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