El 10/03/2011 15:35, jimlux escribió:
Heck, every time I buy parts at home, it seems the packing slip always
has some sort of generic "these parts may be subject to export
controls" notice on it. Yep.. those 10Meg resistors just might be a
vital piece of an armament...
This remembers me wh
It is more a matter about that the involved technology could be ITAR
classified or with other export restrictions. Ask Hughes and Boeing
about the fine for export control violations in Intelsat 708 :)
http://en.wikipedia.org/wiki/Intelsat_708
I think most people who work with rockets with guid
El 10/03/2011 02:43, Sanjeev Gupta escribió:
On Wed, Mar 9, 2011 at 22:09, jimlux wrote:
OTOH, if you're building a rocket that's big enough to need something like
this, you can likely get the needed export licenses, or at least, comply
with the export control laws.
Wait, he _is_ exporting
On 3/9/11 5:43 PM, Sanjeev Gupta wrote:
On Wed, Mar 9, 2011 at 22:09, jimlux wrote:
OTOH, if you're building a rocket that's big enough to need something like
this, you can likely get the needed export licenses, or at least, comply
with the export control laws.
Wait, he _is_ exporting the wh
On Wed, Mar 9, 2011 at 5:43 PM, Sanjeev Gupta wrote:
> Can you claim a rocket launch as an Export Credit? "Yes, Officer, we
> will report to the Customs Department if this equipment re-enters US
> Territory. We will keep track of it, thank you. And believe me, I
> will know _precisely_ when th
On Wed, Mar 9, 2011 at 22:09, jimlux wrote:
> OTOH, if you're building a rocket that's big enough to need something like
> this, you can likely get the needed export licenses, or at least, comply
> with the export control laws.
Wait, he _is_ exporting the whole rocket, anyway, isn't he?
Can you
Hi Tom, Kevin,
the JLT DROR GPSDO mentioned by Kevin in the original email may be
overkill for this application, as it is designed to provide very low phase
noise
under extreme vibration conditions, and it is state-of-the-art technology
and priced accordingly. It is designed to interface
Magnus,
Drop the receiver and antenna out of the equation and
just provide a timing signal on launch pad...
I need to keep computers time synchronized from launch through at least
arrival on orbit so that time-tagged network messages can be played back
with some degree of fidelity. For this,
If there are already other GPS units onboard,
also be careful of interference. On some of our
balloon work we have had COTS GPS receivers that
would jam each other if placed to closely together.
It'd be a shame if your $50 cheapie jammed the
space-rated unit and sank the whole mission.
Hello,
El 09/03/2011 19:58, Kevin Watson escribió:
As I said in an earlier message, this is an experiment that I want to
run and would rather not touch mission and safety-critical GNC
components, like our navigation GPS receivers. Mass is not an issue.
So I understand that timing is not dis
On 3/9/11 10:58 AM, Kevin Watson wrote:
Hi Magnus,
As I said in an earlier message, this is an experiment that I want to
run and would rather not touch mission and safety-critical GNC
components, like our navigation GPS receivers. Mass is not an issue.
-Kevin
So this makes it pretty simple..
On 03/09/2011 07:58 PM, Kevin Watson wrote:
Hi Magnus,
As I said in an earlier message, this is an experiment that I want to
run and would rather not touch mission and safety-critical GNC
components, like our navigation GPS receivers. Mass is not an issue.
In that case, take a Thunderbolt, rep
To:
Sent: Wednesday, March 09, 2011 10:25 AM
Subject: Re: [time-nuts] Spacecraft Timekeeping
Kevin,
On 03/09/2011 06:39 PM, Kevin Watson wrote:
Magnus,
Drop the receiver and antenna out of the equation and
just provide a timing signal on launch pad...
I need to keep computers time synchro
Kevin,
On 03/09/2011 06:39 PM, Kevin Watson wrote:
Magnus,
Drop the receiver and antenna out of the equation and
just provide a timing signal on launch pad...
I need to keep computers time synchronized from launch through at least
arrival on orbit so that time-tagged network messages can be
On 03/09/2011 03:15 PM, jimlux wrote:
On 3/8/11 11:05 PM, Magnus Danielson wrote:
On 03/09/2011 06:08 AM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitations, but I'm
not too sure I need such
On 03/09/2011 03:09 PM, jimlux wrote:
On 3/8/11 1:45 PM, Magnus Danielson wrote:
Kevin,
On 03/08/2011 06:57 PM, Kevin Watson wrote:
Hi Jim,
Do you, or anyone else, have a recomendation for the GPSDO? Jackson
Labs'
(http://jackson-labs.com/) DROR seems like it might work, but I
wonder if
the
arch 09, 2011 6:15 AM
Subject: Re: [time-nuts] Spacecraft Timekeeping
On 3/8/11 11:05 PM, Magnus Danielson wrote:
On 03/09/2011 06:08 AM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitation
, I need the time source on the
rocket. Using a GPSDO in holdover mode seems like a good solution.
-Kevin
- Original Message -
From: "Magnus Danielson"
To:
Sent: Tuesday, March 08, 2011 11:05 PM
Subject: Re: [time-nuts] Spacecraft Timekeeping
On 03/09/2011 06:08 AM, Ke
On Tue, Mar 8, 2011 at 11:05 PM, Magnus Danielson
wrote:
I'm still wondering exactly which spacecraft this person is working
on. His questions are not indicative of current leading edge research
in this area. Sounds like he is starting from zero and maybe not up
to speed on current best practi
On 3/8/11 11:05 PM, Magnus Danielson wrote:
On 03/09/2011 06:08 AM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitations, but I'm
not too sure I need such a receiver. As my application is to ju
On 3/8/11 9:08 PM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitations, but I'm
not too sure I need such a receiver. As my application is to just
accuratly time-tag messages for a data recorder
On 3/8/11 1:45 PM, Magnus Danielson wrote:
Kevin,
On 03/08/2011 06:57 PM, Kevin Watson wrote:
Hi Jim,
Do you, or anyone else, have a recomendation for the GPSDO? Jackson Labs'
(http://jackson-labs.com/) DROR seems like it might work, but I wonder if
there might be better alternatives.
Firs
On 3/8/11 11:41 AM, Chris Albertson wrote:
On Tue, Mar 8, 2011 at 9:57 AM, Kevin Watson wrote:
Hi Jim,
As part of my research into keeping time on rockets and spacecraft, I joined
this list to see what I could learn from the masters. Of course I'm a
knuckle-head for not assuming that you'd be
On 3/8/11 9:57 AM, Kevin Watson wrote:
Hi Jim,
As part of my research into keeping time on rockets and spacecraft, I
joined
this list to see what I could learn from the masters. Of course I'm a
knuckle-head for not assuming that you'd be one of the resident masters
. Anyway, as my accuracy needs
On 03/09/2011 06:08 AM, Kevin Watson wrote:
Hi All. Thanks for responding. There are quite a few GPS receivers that
will work outside of the usual commercial-grade GPS limitations, but I'm
not too sure I need such a receiver. As my application is to just
accuratly time-tag messages for a data rec
ssage -
From: "ehydra"
To: "Discussion of precise time and frequency measurement"
Sent: Tuesday, March 08, 2011 3:02 PM
Subject: Re: [time-nuts] Spacecraft Timekeeping
There are is a list on a ballooner website with GPS devices working beyond
export rules.
- Hen
There are is a list on a ballooner website with GPS devices working
beyond export rules.
- Henry
--
ehydra.dyndns.info
Magnus Danielson schrieb:
First thing to consider is that standard GPSes will not meet your needs,
since they have to obey the height and speed limits for export rules.
Kevin,
On 03/08/2011 06:57 PM, Kevin Watson wrote:
Hi Jim,
As part of my research into keeping time on rockets and spacecraft, I
joined
this list to see what I could learn from the masters. Of course I'm a
knuckle-head for not assuming that you'd be one of the resident masters
. Anyway, as my a
On Tue, Mar 8, 2011 at 9:57 AM, Kevin Watson wrote:
> Hi Jim,
>
> As part of my research into keeping time on rockets and spacecraft, I joined
> this list to see what I could learn from the masters. Of course I'm a
> knuckle-head for not assuming that you'd be one of the resident masters
> . Anywa
Hi Jim,
As part of my research into keeping time on rockets and spacecraft, I joined
this list to see what I could learn from the masters. Of course I'm a
knuckle-head for not assuming that you'd be one of the resident masters
. Anyway, as my accuracy needs are modest (~10uS across many onboard
c
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