From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Scott Newell
Sent: Wednesday, January 25, 2012 9:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Determination of the placement of the first pps
At 09:13 PM 1/25/2012, J. L. Tr
At 09:13 PM 1/25/2012, J. L. Trantham wrote:
Both pin 3 and pin 6 are 'high' when power is first applied. When the unit
'locks', both pin 3 and 6 go 'low' but pin 6 then puts out a 5 uSec wide 1
PPS pulse, as judged by my 'calibrated eyeball' which means that I used a
stop watch and counted the
re located. Don't hold your breath on that though, too many
irons in the fire.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Magnus Danielson
Sent: Wednesday, January 25, 2012 1:19 PM
To: time-nuts@febo.com
Subject: Re: [ti
I'm sure people will figure out all these undocumented features. But
there is a danger is using any of them because some day your Rb
oscillator will fail and you will need to replace it. You can't count
on the replacement unit to have the same set of undocumented features.
I do intend to lock mi
Hi Joe,
On 01/25/2012 08:04 PM, J. L. Trantham wrote:
Magnus,
Thanks for the research. Now that I have read your information, I am going
to have to go back and 'measure' the PPS output on my unit. I just
'eyeballed' the '1 PPS' and it seemed close to 1 second.
Good luck. Hopefully I put you
lf Of Bob Camp
Sent: Wednesday, January 25, 2012 11:43 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Determination of the placement of the first pps
Hi
Based on the number of units that come in with the "1 pps output" missing,
I'd bet the
nt: Tuesday, January 24, 2012 10:14 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Determination of the placement of the first pps
On 01/25/2012 02:41 AM, J. L. Trantham wrote:
> Darn.
>
> I was hoping for that feature. I still think it should be there.
Indeed. Should be in there s
Yikes, please delete that pastebin link. That was just my initial try at a FAQ.
A significantly updated and more current version of the FE-5680A FAQ is
located at
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5860a_faq
Scott's utility seems to be able to dump the FEI unit serial
On 01/25/2012 02:41 AM, J. L. Trantham wrote:
Darn.
I was hoping for that feature. I still think it should be there.
Indeed. Should be in there somewhere...
Didn't see these link hit the list:
http://pastebin.com/S8UcnCMZ
http://www.dd1us.de/Downloads/precise%20reference%20frequency%20rev%2
] Determination of the placement of the first pps
On 01/24/2012 08:07 PM, J. L. Trantham wrote:
> Magnus,
>
> How did you 'jump' the PPS on the FE-5680A? Is it a serial command? How
do
> you 'sync' it to the external PPS from say a TBolt?
I was not talking about
On 01/24/2012 08:07 PM, J. L. Trantham wrote:
Magnus,
How did you 'jump' the PPS on the FE-5680A? Is it a serial command? How do
you 'sync' it to the external PPS from say a TBolt?
I was not talking about the 5680 specific. Sorry for the unclarity.
Cheers,
Magnus
__
Tuesday, January 24, 2012 12:51 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Determination of the placement of the first pps
On 01/24/2012 12:42 PM, J. L. Trantham wrote:
> Thanks Chris.
>
> It seems such a logical feature to have, I would think it would have
> been included perh
sage-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: Tuesday, January 24, 2012 12:34 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Determination of the placement of the first pps
On Mon, Jan 23, 2
Of Jim Lux
Sent: Tuesday, January 24, 2012 12:06 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Determination of the placement of the first pps
On 1/23/12 5:50 PM, J. L. Trantham wrote:
> Is this, in any way, related to the fact the Earth has a Moon?
>
> Ideally, the Earth rotates aro
-boun...@febo.com] On
Behalf Of Chris Albertson
Sent: Tuesday, January 24, 2012 12:34 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Determination of the placement of the first pps
On Mon, Jan 23, 2012 at 5:50 PM, J. L. Trantham wrote:
> Is this, in any
On Mon, Jan 23, 2012 at 5:50 PM, J. L. Trantham wrote:
> Is this, in any way, related to the fact the Earth has a Moon?
>
> is there a way to
> 'sync' the 1 PPS output of an FE-5680A to an external signal, such as a GPS
> receiver or TBolt? I would think that might be possible given their
> orig
On 1/23/12 5:50 PM, J. L. Trantham wrote:
Is this, in any way, related to the fact the Earth has a Moon?
Ideally, the Earth rotates around the Sun and the Moon rotates around the
Earth. However, is it better described as the 'center of mass' of the
Earth/Moon
barycenter is the term
rotates
pose.
Thanks in advance.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Hal Murray
Sent: Monday, January 23, 2012 1:39 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Determination of the placeme
albertson.ch...@gmail.com said:
> The next question is "which stars" and I think measurements are good enough
> that the question of "Which Stars?" matters. Makes sense when you remember
> that a nano second is about a foot and all stars are moving quite fast
> relative to each other.
Astronomer
In message
, Chris Albertson writes:
>The Earth's rotation is always refferenced to a larger reference frame
>of distant stars, not the sun.
It's actually distant quarsars, and the point being that they are so
far away that any cross-field motion they might or might not have
would not represent
The Earth's rotation is always refferenced to a larger reference frame
of distant stars, not the sun.If you try and use the Sun, I think
there are smaller effects like the Earth and Moon revolve around a
common center and then there is Jupiter. So they use stars.
The next question is "which s
> Not to mention the solar noon varies by +/- 15min over the year (don't ask
> me how this is called...old knowledge from my high school days)
Analemma: It's the figure 8 you see on globes in the middle of the Pacific
Ocean.
It's caused by the Earth's orbit not being circular and the axis of r
Yes. The 1421 MHz is about the closest, practical, universal standard
available to us at the moment. But is not absolute. What if you were in a
different gravitational field? (The Pound gravitational red-shift
experiment)
-John
=
> On 1/23/12 9:45 AM, J. Forster wrote:
>> The fu
On 1/23/12 9:45 AM, J. Forster wrote:
The fundamental problem is our system of units is not defined rationally.
What is universal about a meter or a second or a kilogram? Nothing!
If you were suddenly transported elsewhere in the universe bareassed,
could you replicate the standards we use?
If
On Mon, Jan 23, 2012 at 8:56 AM, Attila Kinali wrote:
> On Mon, 23 Jan 2012 08:43:01 -0800
> Chris Albertson wrote:
>
>
>>
>> It's a transit telescope (one that looks up at the local meridian) but
>> they don't use the sun. It looks at every start that passes in front
>> of it, thousands of them
time and frequency measurement
> Subject: Re: [time-nuts] Determination of the placement of the first pps
>
> On Mon, 23 Jan 2012 08:43:01 -0800
> Chris Albertson wrote:
>
>
>>
>> It's a transit telescope (one that looks up at the local meridian) but
>>
oun...@febo.com] On
Behalf Of Attila Kinali
Sent: Monday, January 23, 2012 11:57 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Determination of the placement of the first pps
On Mon, 23 Jan 2012 08:43:01 -0800
Chris Albertson wrote:
>
> It's a t
On Mon, 23 Jan 2012 08:43:01 -0800
Chris Albertson wrote:
>
> It's a transit telescope (one that looks up at the local meridian) but
> they don't use the sun. It looks at every start that passes in front
> of it, thousands of them every night. Then they reduce the data by
> knowing the exact
On Fri, Jan 20, 2012 at 9:30 AM, Bob Camp wrote:
> Hi
>
> The original location of the PPS was from astronomical data. That's still
> what ultimately steers UTC.
>
> More precisely, for the US, there's a telescope at the Naval Observatory
> that watches the sun as it comes overhead. The point it h
20, 2012 12:23 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Determination of the placement of the first pps
As I am, as Heinlein would say, but an egg in terms of time-nuttery,
perhaps someone could point me toward some history in order to help answer
a question recently p
As I am, as Heinlein would say, but an egg in terms of time-nuttery,
perhaps someone could point me toward some history in order to help answer
a question recently posed to me.
At what point was the original global 1pps leading (trailing?) edge
defined/distributed and to what was (is) it reference
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