On Wed, Sep 8, 2010 at 02:16, jimlux jim...@earthlink.net wrote:
Mark J. Blair wrote:
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Yes.. except that the cable's physical and electrical length *do* vary with
temperature, so if you're looking at the gnat's eyelash sort of thing, you
need to take
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] What position is measured?
On Wed, Sep 8, 2010 at 02:16, jimlux jim...@earthlink.net wrote:
Mark J. Blair wrote:
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Yes.. except that the cable's physical
...@febo.com] On Behalf
Of Pierpaolo Bernardi
Sent: 08 September 2010 11:36 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What position is measured?
On Wed, Sep 8, 2010 at 02:16, jimlux jim...@earthlink.net wrote:
Mark J. Blair wrote:
On Sep 7, 2010, at 6:30
Tom Holmes wrote:
One other delay contributor would appear to be processing delay in the
receiver, which thus begs the question of how the PPS signal is actually
synchronized to the GPS system.
The GPS nav messages is synchronized to the seconds, so it's a matter of
making sure the output
Pierpaolo Bernardi wrote:
On Wed, Sep 8, 2010 at 02:16, jimlux jim...@earthlink.net wrote:
Mark J. Blair wrote:
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Yes.. except that the cable's physical and electrical length *do* vary with
temperature, so if you're looking at the gnat's eyelash sort
City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of jimlux
Sent: Wednesday, September 08, 2010 9:42 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What position is measured?
Tom
Tom Holmes wrote:
Thanks, Jim.
I assume that neither the satellite nor the receiver knows what the
variation in the light time delay is, so it must be small enough to allow
the claimed nanosecond accuracy of the PPS edge.
Well.. that's the difference between a L1 only and a L1/L2 receiver.
[mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Holmes
Sent: Wednesday, September 08, 2010 10:19 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] What position is measured?
Thanks, Jim.
I assume that neither the satellite nor the receiver knows what
On 09/08/2010 04:51 PM, jimlux wrote:
Tom Holmes wrote:
Thanks, Jim.
I assume that neither the satellite nor the receiver knows what the
variation in the light time delay is, so it must be small enough to allow
the claimed nanosecond accuracy of the PPS edge.
Well.. that's the difference
On 09/08/2010 05:34 PM, Bob Camp wrote:
Hi
Actually they do know a bit about the light delay. They include that data in
the information the stat's broadcast. The data is fairly coarse grained. I
posted some links a week or so back that go into all the grubby details.
Coarse grain is certainly
Hi nuts,
have got some interesting question from friends.
They asked
What coordinates are measured and registrated by a GPS.
Is it the position of the antenna, it could be 100m (300ft) away from me
or is it the position of the GPS RX as this is the position of the µC where
signals are
...@gmx.de
Sent: Tuesday, September 07, 2010 1:57 AM
To: time-nuts@febo.com
Subject: [time-nuts] What position is measured?
Hi nuts,
have got some interesting question from friends.
They asked
What coordinates are measured and registrated by a GPS.
Is it the position of the antenna, it could
Peter Krengel wrote:
Hi nuts,
have got some interesting question from friends.
They asked
What coordinates are measured and registrated by a GPS.
Is it the position of the antenna, it could be 100m (300ft) away from me
or is it the position of the GPS RX as this is the position of the µC
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Another analogy is that if you had a machine that recorded all the signals,
mounted right at the antenna, and then carried the recording half way around
the world, and then ran the recording into a receiver, it would give you the
position of the
Exactly, well put.
John WA4WDL
--
From: Mark J. Blair n...@nf6x.net
Sent: Tuesday, September 07, 2010 12:24 PM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] What position is measured
and frequency measurement
Subject: Re: [time-nuts] What position is measured?
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Another analogy is that if you had a machine that recorded all the
signals, mounted right at the antenna, and then carried the recording half
way around the world, and then ran
Hi Mark:
Exactly.
Have Fun,
Brooke Clarke
http://www.PRC68.com
Mark J. Blair wrote:
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Another analogy is that if you had a machine that recorded all the signals,
mounted right at the antenna, and then carried the recording half way around
the
@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] What position is measured?
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Another analogy is that if you had a machine that recorded all the signals,
mounted right at the antenna
Does this mean that while the antenna feedline cable length does not
influence the measured position (at the phase center of the antenna), and it
does not influence the accuracy of a disciplined frequency reference output,
it does introduce an error into the absolute time output (i.e., adding
Mark J. Blair wrote:
On Sep 7, 2010, at 6:30 AM, jimlux wrote:
Another analogy is that if you had a machine that recorded all the signals,
mounted right at the antenna, and then carried the recording half way around
the world, and then ran the recording into a receiver, it would give you the
On Sep 7, 2010, at 5:16 PM, jimlux wrote:
Yes.. except that the cable's physical and electrical length *do* vary with
temperature, so if you're looking at the gnat's eyelash sort of thing, you
need to take that into account. Maybe 10 ppm/degree, so a 20 meter run will
change a bit less
-boun...@febo.com] On
Behalf Of Hal Murray
Sent: Tuesday, September 07, 2010 5:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What position is measured?
Does this mean that while the antenna feedline cable length does not
influence the measured
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