Was this the paper you are referring to?
tycho.usno.navy.mil/ptti/ptti99/PTTI_1999_405.PDF
On Fri, Apr 27, 2012 at 4:14 PM, Attila Kinali wrote:
> Moin,
>
> On Wed, 25 Apr 2012 20:45:54 -0400 (EDT)
> saidj...@aol.com wrote:
>
> > > But.. is the CSAC not on the ITAR list? I would expect it to
Moin,
On Wed, 25 Apr 2012 20:45:54 -0400 (EDT)
saidj...@aol.com wrote:
> > But.. is the CSAC not on the ITAR list? I would expect it to be,
> > as even some precision OCXO and a lot of MCXO are.
>
> This is the beauty, they are not ITAR or HAZMAT restricted! They received
> approvals.
Now
On 04/25/2012 08:42 PM, Attila Kinali wrote:
Moin,
On Wed, 25 Apr 2012 10:05:00 -0700
"Tom Van Baak" wrote:
Are you sure the customer said sub-mm and not sub-meter? I know
post-processing is really helpful, but the LEA-6 is a single frequency
receiver so all the advantage of L2 is lost for th
On 04/25/2012 07:05 PM, Tom Van Baak wrote:
Hi Attila,
Are you sure the customer said sub-mm and not sub-meter? I know
post-processing is really helpful, but the LEA-6 is a single frequency
receiver so all the advantage of L2 is lost for this customer. The
bullet antenna's don't even have an arr
Hi Attila,
But.. is the CSAC not on the ITAR list? I would expect it to be,
as even some precision OCXO and a lot of MCXO are.
This is the beauty, they are not ITAR or HAZMAT restricted! They received
approvals.
We just published an article about the CSAC GPSDO products we offer in the
On Wed, 25 Apr 2012 12:29:59 -0700
Chris Albertson wrote:
> 1) You could use a choke ring if you were willing to build a large size
> conical cover or (say) fiberglass
I thought about that... customer doesn't seem to like it.
> 2) Seems that you might want a much taller mast for you solar cell
.
Tom
- Original Message -
From: "Attila Kinali"
To: "Tom Van Baak" ; "Discussion of precise time and
frequency measurement"
Sent: Wednesday, April 25, 2012 2:42 PM
Subject: Re: [time-nuts] Sub mm measurements with gps timing antennas?
Beside the hars
On Wed, Apr 25, 2012 at 11:42 AM, Attila Kinali wrote:
> Moin,
>
> After installation the system
> runs on solar power with a backup battery. But this doesn't guarrantee
> power at all. The solar panel could be below a meter or two of snow.
> Hence the whole system has to cope with periodic power
On Wed, 25 Apr 2012 15:02:45 -0400 (EDT)
saidj...@aol.com wrote:
> Just brainstorming here, but how about this un-conventional approach:
>
> Use a CSAC as a precise frequency reference for the LEA-6T. CSAC should
> operate at <0.12W, I know, that's a lot, but maybe just worth a try.
Oh.. the
Just brainstorming here, but how about this un-conventional approach:
Use a CSAC as a precise frequency reference for the LEA-6T. CSAC should
operate at <0.12W, I know, that's a lot, but maybe just worth a try.
To make the CSAC work, multiply the 10MHz up to the 26MHz the LEA uses.
Then pl
Moin,
On Wed, 25 Apr 2012 10:05:00 -0700
"Tom Van Baak" wrote:
> Are you sure the customer said sub-mm and not sub-meter? I know
> post-processing is really helpful, but the LEA-6 is a single frequency
> receiver so all the advantage of L2 is lost for this customer. The
> bullet antenna's don't
>From a friend:
Yes, emphatically! It was established more than twenty years ago, by
theory and experiment, that simple GPS receiving antennas yield position
determinations with errors of many millimeters, and time-synchronization
errors of equivalent magnitude (i.e., many millimeters multiplied
7:56 AM
Subject: [time-nuts] Sub mm measurements with gps timing antennas?
Moin,
We've a customer who does sub mm measurements using GPS in alpine
enviroment. This is done using LEA-6T modules, logging of raw phase
data and offline post processing using long averaging windows.
Now, the
On 04/25/2012 06:37 PM, Said Jackson wrote:
Hi Attila,
I agree, keep the gps away from such fast and large temperature excursions. The
internal tcxo is not as stable as one would expect.. Building a larger box and
burying it could help slow the temp gradient..
Indeed. I forgot to say that su
#x27;s going to make
sub mm work pretty tough.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Attila Kinali
Sent: Wednesday, April 25, 2012 10:57 AM
To: time-nuts@febo.com
Subject: [time-nuts] Sub mm measurements with gps timing
Hi Attila,
I agree, keep the gps away from such fast and large temperature excursions. The
internal tcxo is not as stable as one would expect.. Building a larger box and
burying it could help slow the temp gradient..
Bye,
Said
Sent From iPhone
On Apr 25, 2012, at 8:52, Magnus Danielson wrote
Hi Attila,
On 04/25/2012 04:56 PM, Attila Kinali wrote:
Moin,
We've a customer who does sub mm measurements using GPS in alpine
enviroment. This is done using LEA-6T modules, logging of raw phase
data and offline post processing using long averaging windows.
Now, the customer had some problems
You are not going to get anywhere near sub-mm levels without doing L1/L2
measurements with a geodetic grade receiver and thermally stabilized antenna
(and receiver/cable). With a patch antenna (which is in a lot of timing
antenas) on a geodetic L1/L2 receiver you can see 1 meter errors!
Moin,
We've a customer who does sub mm measurements using GPS in alpine
enviroment. This is done using LEA-6T modules, logging of raw phase
data and offline post processing using long averaging windows.
Now, the customer had some problems reaching the precision requirements
and i'm wondering whet
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