From: Tom Clark, K3IO [EMAIL PROTECTED]
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Date: Sun, 10 Dec 2006 22:31:41 -0500
Message-ID: [EMAIL PROTECTED]
Tom,
FYI -- the slides from Rick my paper entitled Improving the
Performance of Low Cost GPS Timing Receivers presented
:[EMAIL PROTECTED] On
Behalf Of Richard H McCorkle
Sent: Monday, December 11, 2006 2:06 AM
To: [EMAIL PROTECTED]; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Am I the only one who can't find the PTTI_2006.pdf file at the address
listed
Magnus Danielson wrote:
FYI -- the slides from Rick my paper entitled Improving the
Performance of Low Cost GPS Timing Receivers presented at PTTI are
now available at [1][1]http://gpstime.com/ as[2]
[2]ftp://ftp.cnssys.com/pub/PTTI/PTTI_2006.pdf and
That one is not there!!!
Hi Tom,
how many M12M iLotus samples did you test to find the one with 30ns offset?
Were these pre-production samples or mass production units?
How did the other ones perform?
Seems iLotus may not test/calibrate/inspect as thoroughly as Motorola did?
Thanks,
Said
[EMAIL PROTECTED] wrote:
Hi Tom,
how many M12M iLotus samples did you test to find the one with 30ns
offset? Were these pre-production samples or mass production units?
How did the other ones perform?
Seems iLotus may not test/calibrate/inspect as thoroughly as
PM
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
FYI -- the slides from Rick my paper entitled Improving the
Performance of Low Cost GPS Timing Receivers presented at PTTI are
now available at [1]http://gpstime.com/ as[2]
ftp://ftp.cnssys.com/pub/PTTI/PTTI_2006.pdf
Neat writeup. Thanks.
The change in altitude caused a frequency shift that, when totaled for
3 days, amounted to a clock offset of ~22 nsec with respect to his at
home clock bank
What's the calculated value? Lassen isn't very high. Are the campgrounds
higher than Denver/Boulder?
For
Hal,
What's the calculated value? Lassen isn't very high. Are the campgrounds
higher than Denver/Boulder?
It was Mt Rainier, near here in Seattle, WA. We
went up to the 5400' level where the clocks ran on
the order of 500 ps/hour faster than at my home lab
at 1000'. We stayed up there about
]
To: 'Discussion of precise time and frequency measurement'
time-nuts@febo.com
Sent: Saturday, December 09, 2006 11:11 AM
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Ah, yes, the C field. A change in magnetic field can change
the clock frequency. Parts in 1e-14 are exceedingly
From: Tom Van Baak [EMAIL PROTECTED]
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Date: Sat, 9 Dec 2006 07:43:41 -0800
Message-ID: [EMAIL PROTECTED]
Hal,
Tom,
What's the calculated value? Lassen isn't very high. Are the campgrounds
higher than Denver/Boulder?
It was Mt
From: Bill Hawkins [EMAIL PROTECTED]
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Date: Sat, 9 Dec 2006 10:11:05 -0600
Message-ID: [EMAIL PROTECTED]
Ah, yes, the C field. A change in magnetic field can change
the clock frequency. Parts in 1e-14 are exceedingly small.
If you run
I second the request for public release off these slides! (pounds shoe on
podium)
I've got plenty of hosting space, if that would help at all.
-- john, KE5FX
What's the calculated value? Lassen isn't very high. Are the
campgrounds
higher than Denver/Boulder?
It was Mt Rainier, near
On Sat, December 9, 2006 17:52, Magnus Danielson said:
Remember that while you are 1340 meters up, the mountains gravity pull
creates a local compensation to a small degree, so you will not fully
experience the full altitude difference.
Would that mountaing gravity pulling be accounted for
I greatly enjoyed measuring the Rabi-Ramsey separations on my Cs beam by
inserting my own 12.6 MHz signal which I swept with my network analyzer. I
then
modulated the detected level through a double-balanced mixer with 12.6 MHz
signal and tossed that in on the measurement port. Then I actually
It is surprisingly hard to get a straight answer about what happens to g on
a mountain (http://www.newton.dep.anl.gov/askasci/phy00/phy00905.htm). I
guess it's in the paper, but what source(s) did you use to arrive at the
1.5E-13 figure?
It might be interesting to take another expedition of the
In message [EMAIL PROTECTED], John Miles writes:
It is surprisingly hard to get a straight answer about what happens to g on
a mountain (http://www.newton.dep.anl.gov/askasci/phy00/phy00905.htm).
Theres no way to accurately predict g, only measurements will do if you
want precision, but a first
Remember that while you are 1340 meters up, the mountains gravity pull
creates
a local compensation to a small degree, so you will not fully experience
the
full altitude difference.
Magnus,
Yes, I considered this but found the compensation
was several orders of magnitude below the numbers
I
Theres no way to accurately predict g, only measurements will do if you
want precision, but a first order aproximation can be derived from
a topological representation and rudimentary knowledge of the geology.
PHK,
I think a first-order value comes simply from the mass
and radius of the
Ah, that makes sense... g=G*M/(r^2), so a small change in radius (elevation)
matters a lot more than the small change in mass underfoot. It's back to
junior-high physics for me...
-- john, KE5FX
Remember that while you are 1340 meters up, the mountains gravity pull
creates
a local
From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Date: Sat, 9 Dec 2006 20:08:04 +0100 (CET)
Message-ID: [EMAIL PROTECTED]
On Sat, December 9, 2006 17:52, Magnus Danielson said:
Remember that while you are 1340 meters up, the mountains gravity pull
creates
Don't do that over my house :-)
Didier
Tom Van Baak wrote:
Yes, and instead of dropping sand to keep aloft
over time I could drop the lead acid batteries as I
use them up!
/tvb
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From: Didier Juges [EMAIL PROTECTED]
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Date: Sat, 09 Dec 2006 17:41:28 -0600
Message-ID: [EMAIL PROTECTED]
Don't do that over my house :-)
I too prefer the sand. Besides, he would loose weight by the emptying of
batteries, exhailing
I remember a brief interview with a person who coordinates G info for
the military. They have detailed maps of g effects around the world
(useful for targetting missiles, apparently) but the work is classified.
jay
John Miles wrote:
It is surprisingly hard to get a straight answer about what
time and frequency measurement
Subject: Re: [time-nuts] Time Nuts at PTTI this past week
Don't do that over my house :-)
Didier
Tom Van Baak wrote:
Yes, and instead of dropping sand to keep aloft
over time I could drop the lead acid batteries as I
use them up!
/tvb
This past week, a number of use gathered in Reston, VA for the 38th
annual PTTI (Precision Time Time Interval) meeting (see
http://tycho.usno.navy.mil/ptti/ptti2006/ptti2006.html). The attendance
list included
Tom van Baak (no call, but known to the world as TvB, Seattle)
Jim Jaeger(K8RQ,
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