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- Original Message -
From: "Normand Martel" <[EMAIL PROTECTED]>
To:
Sent: Thursday, April 20, 2006 10:44 PM
Subject: Re: [time-nuts] time-nuts Digest,
Help me! I need explanation!
Robert Lutwak wrote:
>With that said, the Perkin-Elmer rubidium on the IIR
>satellites is an outstanding clock, unquestionably
the
>best rubidium ever manufactured for any application,
>with short-term stability an order-of-magnitude
better
>than the IIF cesiums. The
21
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] time-nuts Digest, Vol 21, Issue 22
So Loran isn't really dead yet!
John
At 03:34 AM 4/20/2006, you wrote:
>The current definition of the second is based on Caesium, as that was
>what was the best then. Howev
I do know that at one stage during the late 80's Loran-C gear became
very well priced compared to the then emerging and expensive GPS
gear, so many sailors bought them. I would not be surprised if a lot
of coastal sailing was done with Loran in the navigators station and
GPS in the hand in the
In message: <[EMAIL PROTECTED]>
"Poul-Henning Kamp" <[EMAIL PROTECTED]> writes:
: In message <[EMAIL PROTECTED]>, John Day write
: s:
: >So Loran isn't really dead yet!
:
: Not quite.
:
: The draft European Radio Navigation plan shows that Loran-C gives
: 22% of the benefit for 7% of
In message <[EMAIL PROTECTED]>, John Day write
s:
>So Loran isn't really dead yet!
Not quite.
The draft European Radio Navigation plan shows that Loran-C gives
22% of the benefit for 7% of the money.
But who knows if that translates to political decisions in its favour.
--
Poul-Henning Kamp
il 2006 06:59
>To: time-nuts@febo.com
>Subject: Re: [time-nuts] time-nuts Digest, Vol 21, Issue 22
>
>
>VE2VM commented
>
>But Isn't Cesium drift-free? Since the SI second is standardized as de
>duration of 9192631770 oscillation of the hyperfine transition of the ato
At the risk of being accused of "propaganda:"
Poul-Henning Kamp <[EMAIL PROTECTED]> writes:
>They last longer.
and Tom Clark, K3IO (ex W3IWI) <[EMAIL PROTECTED]> writes:
>The Cesium clocks in GPS have been less reliable (probably because
> they are more complicated) than the Rb cl
VE2VM commented
But Isn't Cesium drift-free? Since the SI second is
standardized as de duration of 9192631770 oscillation
of the hyperfine transition of the atom 133Cs?
If Cesium drifts, theren should be a more formal
definition of the second (Such as density, maximum
C-field or level of puri
