Hi
I don’t know about the Adafruit GPS, but I do believe that GPS time is
independent of position. Put another way, GPS time is exactly the same here in
PA as it is anywhere else on the planet.
As the GPS computes locations it also computes time. If location is wandering
around, the same
Rule of thumb: every meter off in survey altitude is three nanoseconds.
The error due to inaccurate latitude/longitude is much smaller in
nanoseconds per meter for any reasonable viewable sky.
Tim N3QE
On Sun, Nov 3, 2013 at 10:51 PM, Bob Stewart b...@evoria.net wrote:
I'm experimenting with
On Mon, Nov 4, 2013 at 3:51 AM, Bob Camp li...@rtty.us wrote:
. I can guess it's a vector difference between each two successive
points converted to ns,
That vector difference has to include altitude. Then as you say, convert
distance to time via the speed of light. But I think this is
The pps on that unit is good. Compares favorably to the ublox6T. I can't say
how favorably.
I am working on quantifying its pps as compared to my 2 fury units and the
ublox 6T.
Awaiting a 8 antenna splitter, and dso.
Have another trick up my sleeve but need a Linux kernel hacker. I
Hi Chris,
The manual says timing accuracy 10ns. They further say Position Accuracy
without aid: 3.0m (50% CEP), DGPS 2.5m (50%CEP). I am just learning about all
of this, and DGPS is something new to me. I see PRN-51 in the sky but not
being used. So, I take that to mean that DGPS is turned
Hi Bill,
Keep me informed of what you find, would you? As I noted in my other note, I
don't have DGPS turned on, and I take it that's pretty important for timing
applications. I'll try to get that done early after lunch today.
Bob
From: Bill Dailey
will do... i dont think I have dgps turned on either. never bothered.
On Mon, Nov 4, 2013 at 11:43 AM, Bob Stewart b...@evoria.net wrote:
Hi Bill,
Keep me informed of what you find, would you? As I noted in my other
note, I don't have DGPS turned on, and I take it that's pretty important
On 11/04/2013 06:30 PM, Bill Dailey wrote:
The pps on that unit is good. Compares favorably to the ublox6T. I can't say
how favorably.
I am working on quantifying its pps as compared to my 2 fury units and the
ublox 6T.
They are pretty good, being dirt cheap nav receivers. In this
From: Kasper Pedersen time-n...@kasperkp.dk
When testing, try fast temperature shifts; I found that it would shift the PPS
much more than I expected, as if there is a rather slow filter
driving the PPS output.
Now that's something I hadn't thought of. I'll need to put at least a cover
over my
I was using the Adafruit GPS receivers to calculate the bearing and distance
between two boxes that had radio tranceivers in them. The control box polls
the remote box position and does simple trig on the difference between the GPS
coordinates. I noticed that the Adafruit GPS seems to go
Hello,
fyi KF5OBS did a nice video review of the CSAC GPSDO (and Lecroy high end
scope) that's posted on Youtube now:
http://www.youtube.com/watch?v=CogN630jUSsfeature=c4-overviewlist=UU_XdpUc
sSigyf4JrrPtI5eA
bye,
Said
___
time-nuts mailing
Said,
How much do the CSAC's run?
Thanks,
John Westmoreland
On Mon, Nov 4, 2013 at 5:14 PM, saidj...@aol.com wrote:
Hello,
fyi KF5OBS did a nice video review of the CSAC GPSDO (and Lecroy high end
scope) that's posted on Youtube now:
John,
Too much to post here publicly :)
About one tenth of the price of the next higher available Cesium reference
though, and not much more than some used decades-old functional FTS Cesiums
selling on Ebay. Please call the office for quotes on CSAC units.
Thanks,
Said
On Nov 4, 2013, at
Said,
Yes - Ha! In the video, KF5OBS does say something like the price of a new
car. I have a very wide variance for what that could be - a Scion xB,
Viper, Rolls Royce Bentley..., Ha!
Great video - and thanks for letting us know about it. I actually went to
the NIST chip scale site the other
Stu,
I read this basically when it was posted.
I would like to thank you for posting this. The theory on how to
discipline an OXCO is something that I want to learn more about - and posts
like this help with that
a lot.
So, thank you Stu - much appreciated!
Best Regards,
John Westmoreland
Dear Said and John,
Thank you for your comments on this thread. I just returned from a long
business trip to find out more parties interest in Jackson Labs fine products.
I have seen and enjoyed in awe the video you posted to the thread. This toy
will forever be a unicorn in my dreams, from
Hi John,
well, I think he must have meant a new car back in 1971 :) That would be
about right. It's not quite THAT expensive.
Symmetricom seized to exist as an independent company a couple of days ago,
they were bought out by MicroSemi..
They do make great products, for sure. Please note
Said,
Really - meaning - I knew something was up over at Symmetricon but I didn't
know what you just told us.
Hmmm, I hope the transition goes smoothly and you are able to keep making
progress with the folks at Microsemi.
Best Regards,
John Westmoreland
On Mon, Nov 4, 2013 at 6:51 PM,
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