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"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, July 06, 2010 01:24
Subject: Re: [time-nuts] PICTIC
- Original Message -
From: "Jürg Kögel"
To: "Discussion of precise time and frequency measurement"
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
2010/7/4 Corby Dawson :
Stanley,
Put m
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 a
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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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 pha
> - Original Message -
> From: "Dr Bruce Griffiths" <[EMAIL PROTECTED]>
> To: "Brooks Shera" <[EMAIL PROTECTED]>; "Discussion of precise time and
> frequency measurement"
>
> Brooks
>
> Stop fooling yourself try rea
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 questio
- Original Message -
From: "Ulrich Bangert" <[EMAIL PROTECTED]>
To: "'Discussion of precise time and frequency measurement'"
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 about what is
The excerpt below from GPS World refers to a Chip-scale atomic clock being
developed by DARPA.
Does anyone know what technology they might be using for such a clock?
"Atomic Clock Synchronization
The U.S. Navy Space and Naval Warfare Systems Center San Diego is incorporating
a chip-scale at
A handy passive frequency doubler can be made just using a double-balanced
mixer. Feed 5 MHz into the X and R ports connected together and take 10 MHz
out of the L port. You'll loose a few db and the waveform becomes rather
triangular but if your goal is to sync the internal oscillator in a co
Inspired by Ulrich's lead regarding the high resolution TDC, I asked the
Acam US rep for a quote on the TDC GP2. As Ulrich indicated they are not too
expensive: $28 quantity 1, $26 quantity 10. Sounds great. Temperature
coefficient isn't quoted but it will be considerable - presumably can be
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 fed
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