Unruh wrote:
>> I believe the delays are asymmetric in large part due to vastly
>> different data rates from the earth to the ship (high rate) vs from
>> the ship (low rate).
>
> No idea why that would make it assymetric. Light does not travel at a
> different velocity simply because it is a crowd
Unruh wrote:
>> IIRC, the round trip time approaches 40 min when they are
>> farthest apart? With the worst case velocity difference
>> approaching 121K mph (54KmpS)? Thats approaching 65km
>> difference in distance between when a message is sent,
>> and the response is sent?
>
> So what? The sig
Steve Kostecke wrote:
> On 2009-09-15, David Lord wrote:
>
>> Meanwhile I'll see if ntpd will step from refclock source as
>
> It will.
It does, sort of :-(
On NetBSD-5.0.1 with radioclkd2 + shm and Conrad module tuned
to MSF connected via serial-usb converter, from four attempts
I've twice hi
>Unruh wrote:
>>> IIRC, the round trip time approaches 40 min when they are
>>> farthest apart? With the worst case velocity difference
>>> approaching 121K mph (54KmpS)? Thats approaching 65km
>>> difference in distance between when a message is sent,
>>> and the response is sent?
>>
>> So wha
Unruh wrote:
>> Terje Mathisen wrote:
>> IMHO, this is simply wrong.
>
> Well, your humble opinion in this case does not accord with the way the
> world works.
Mea Culpa!
You are absolutely right: Mars does stand still, so as long as (t3-t2)
is short, both times will be more or less identical.
I have 15 HP Proliant DL 580s and 11 DL 360s all running Linux and NTP4.2.2.
They are configured to use the local stratum 1 servers. What I am noticing is
that:
the 580s have drift values between -31 and -91 while the 360s range between -8
and +7
The 580s have offsets between 0.3 and 6.5 (a
David Lord wrote:
> Steve Kostecke wrote:
>> On 2009-09-15, David Lord wrote:
>>
>>> Meanwhile I'll see if ntpd will step from refclock source as
>>
>> It will.
>
> It does, sort of :-(
>
> On NetBSD-5.0.1 with radioclkd2 + shm and Conrad module tuned
> to MSF connected via serial-usb converter,
On 2009-09-16, David Lord wrote:
> Tonight I gave it another couple or tries with "ntpd -q"
>
> reset +0.150s within 300s
> then used date to give a bigger initial offset
> reset +66.9s within 330s
> then started ntpd and was in sync within 260s
The NTP Stable release needs to poll a refclock 4
Terje,
Funny you should ask. Interplanetary timekeeping is covered in Chapters
17 and 18 in the second edition of das Buch. However, one of the first
things to learn in space is that where you are is much more important
than what time it is.
To compare clocks on the Earth and Mars surfaces you
Steve Kostecke writes:
>On 2009-09-16, David Lord wrote:
>> Tonight I gave it another couple or tries with "ntpd -q"
>>
>> reset +0.150s within 300s
>> then used date to give a bigger initial offset
>> reset +66.9s within 330s
>> then started ntpd and was in sync within 260s
>The NTP Stable re
"David Lord" <> wrote in message
news:7hd884f2t62h...@mid.individual.net...
[]
> That's good enough for me. The usb connection rules out
> PPS mode and seems to limit to +/-10ms.
>
>
> cheers
>
> David
Why rule out PPS? I tried a GPS/PPS signal over USB and found a jitter of
about 45 microseco
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