- Original Message -
From: Jürg Kögel j.koeg...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, July 06, 2010 01:24
Subject: Re: [time-nuts] PICTIC II PCB group buy
Plaese add me to the list for two boards
Thanks Juerg
If it's not too late - Please add me to the list for two boards (ignore my
previous null message).
Thanks, Brooks
- Original Message -
From: Jürg Kögel j.koeg...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Tuesday, July 06, 2010
Spin-1/2 Optical Lattice Clock
N. D. Lemke, A. D. Ludlow, Z. W. Barber, T. M. Fortier, S. A. Diddams, Y.
Jiang, S. R. Jefferts, T. P. Heavner, T. E. Parker, and C. W. Oates
Phys. Rev. Lett. 103, 063001 (Published August 3, 2009)
A news article:
If your wristwatch was as accurate as today's
In view of recent interest in the Allan Deviation of GPS-based 1 pps time,
it should be mentioned that the calculation of ADEV is based on a
statistical model which is not completely appropriate for noise sources
present in GPS signals and their decoding hardware/software. For example,
white
Tom's (tvb) plot I referred to in a previous message is at
http://www.leapsecond.com/pages/3gps/gps-adev-mdev.gif
Sorry for the confusion.
Brooks
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- Original Message -
From: Dr Bruce Griffiths [EMAIL PROTECTED]
To: Brooks Shera [EMAIL PROTECTED]; Discussion of precise time and
frequency measurement time-nuts@febo.com
Brooks
Stop fooling yourself try reading:
/Time Interval Averaging: Theory, Problems, and Solutions
Recently there has been some mention of the influence of 1pps sawtooth and
hanging bridges jitter on the performance of a GPSDO.
It would seem to me that the jitter must average to zero in the long run,
for if it did not the 1pps signal would drift away from its relation to UTC.
But the
- Original Message -
From: Ulrich Bangert [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Friday, December 15, 2006 05:47
Subject: Re: [time-nuts] LPRO-101 with Brooks Shera's GPS locking circuit
...
I second Bruces's opinion
I received the note below from Ernie Peres in Germany which reports an effect
consistent with an occasional phase jump in the 1 PPS output from a M12+ rcvr,
perhaps related to DGPS corrections. The DGPS sats Ernie sees from his
location are part of the EGNOS system.
The DGPS sats visible to
Magnus is correct that many Rb's have a voltage
input EFC control. But in case yours needs a
current source, the note below, which is an
excerpt from some notes on how the drive an
Efratom FRK-L from a gps controller, might be a
start.
The FRK-L has one end of the C-coil grounded and
the other
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