A GPSDO typically makes the assumption that the position of its antenna is
fixed and well-known. That removes position uncertainty from the navigation
equations, and allows all the information from the satellite measurements
to be used to improve the time estimate. Errors in this position create
Hi Tom,
Clear as crystal thanks. I'll post some results.
I just reread Bill Riley's notes on this, and they now also make perfect
sense.
Thanks.
david
Folks,
I asked about 3 cornered comparisons some time ago, and now have plenty
of data to start exploring, and way more than the 3
...if I understand what the article says, the watch won't be the demo
board. So it has to be the price for thhe sheet cube itself.
Am 02.05.2013 01:31, schrieb Bob Camp:
Hi
Rummor has it that the single piece price in the US is $1475 for just the CSAC.
Weather that's with or without the
In message 5182325e.4020...@t-online.de, Volker Esper writes:
Rummor has it that the single piece price in the US is $1475 for just the
CSAC. Weather that's with or without the demo board
And for that price a SRS PRS10 is a better buy, unless you need it
to be compact and not use too much
I should have given this URL:
http://home.comcast.net/~rdirosario/site/?/photos/
which gives you the full resolution if you click on the photos.
Robert
- Original Message -
From: ka3...@comcast.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent:
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb writes:
The next best idea is to locate your antenna on Google Maps. [...]
If your GPSDO's self-survey isn't better than the registration of
Google Maps, you have different problems.
In particular, be
On Thu, May 2, 2013 at 5:29 PM, Stewart Cobb stewart.c...@gmail.com wrote:
GPS surveying equipment can easily determine the position of your antenna
to within a few centimeters (~20 ps). Unfortunately, such equipment is
expensive and difficult to borrow.
A high-end GPSDO designed today should
On 5/2/13 5:18 AM, Poul-Henning Kamp wrote:
In message 5182325e.4020...@t-online.de, Volker Esper writes:
Rummor has it that the single piece price in the US is $1475 for just the
CSAC. Weather that's with or without the demo board
And for that price a SRS PRS10 is a better buy, unless you
Google maps is NOT that good, it can be off by a lot, tens of meters.
I had to have my property line surveyed some years ago to get a city
building permit. So now I have two brass markers at know position.
The survey crew used traditional transits from a brass benchmark.
Google Earth thinks these
On 2013-05-02 14:18, Poul-Henning Kamp wrote:
In message 5182325e.4020...@t-online.de, Volker Esper writes:
Rummor has it that the single piece price in the US is $1475 for just the
CSAC. Weather that's with or without the demo board
And for that price a SRS PRS10 is a better buy, unless
I have a worse than optimal antenna location for my t-bolt and that just choked
on being fed the google earth location which is 7.5 meters away.
Le 2 mai 2013 à 14:22, Poul-Henning Kamp a écrit :
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb
Hi,
The New style A3 is in mainframes with SN prefix 2644A and above and has
series 2644 on its label.
I'll see about getting the schematic and theory page posted where
everyone can access it.
Corby
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How much would it cost to design and build one to fit in a typical
cell phone volume?
Ronald
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Actually, wouldn't you need a satellite visible mark to use google earth? Not
every marker can be seen on google earth.
Then often these markers are in places you can't use safely, such as in the
middle of a road.
Note that google earth does orthorectification on the imagery. If you knew
Is it reasonable to to use a GPS distribution amplifier (viz. HP
58516A) to power a five volt antenna feeding three volt receivers or
should I get a bias tee? The internal operation of my electronics
is largely a mystery to me.
Thanks.
--
Paul
___
PHK, the big pdf link in your sneak page is broken (gives 404). Can you
fix that for us?
P.S., while you are there you could change goory' to gory.
On 5/2/2013 5:22 AM, Poul-Henning Kamp wrote:
In message
CAPXiX5ricf=Ea0B=c2yr8ix+70srtfj9jeutkguqehh5izb...@mail.gmail.com, Stewart
Cobb
Hi
A clock based on an eBay Rb can be set up to pull less than 10 watts. Based
on 8 hours of light a day that would get you to 30 watts of solar needed to
power it. That's a pretty small fraction of your 480W setup. You will get
CSAC level timing and still fit your budget.
For a lower power
Hi
There's something over $100M invested so far getting the CSAC to it's
current size. One would guess much more than that to get it (or it plus
batteries) to fit in an iPhone case.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of
Interesting... I never even received a response from Symmetricom to my request
for a quote. But I do now regularly receive their sales emails.
On May 2, 2013, at 12:22, Jonatan Walck jwa...@netnod.se wrote:
On 2013-05-02 14:18, Poul-Henning Kamp wrote:
In message
ADEV_Free_Run.pdf
ADEV_CSAC_Final.pdf
Said,
You can update your marketing literature. My measurements of your GPSDO-CSAC
are more favorable (flavorful?) than what your PDF files show.
See: http://leapsecond.com/pages/csac/
/tvb
- Original Message -
From: saidj...@aol.com
To:
On 05/02/2013 03:26 PM, Paul wrote:
Is it reasonable to to use a GPS distribution amplifier (viz. HP
58516A) to power a five volt antenna feeding three volt receivers or
should I get a bias tee? The internal operation of my electronics
is largely a mystery to me.
Bias tee would be best
Turning off the Rb is a good idea. That is one of the best features
of the Rb is that it will come back on from a zero power and be pretty
much spot on the frequency but the phase will be random.So the
question is that if you want to re-calibrate the OCXO how long to you
need to compare it to
The HP58516A has no external DC power connector (unless it has the option
05Q). The receiver feeds the HP58516A and then the antenna. Maybe your
antenna works downto 3V. The bias tee needs also a DC-block, otherwise you
will put the 5V to the receiver's input too.
On Thu, May 2, 2013 at 9:26 PM,
Paul
It depends on the antenna the old ones were 5 and the new 3.3V. I believe
5V on a 3.3 antenna is bad and the other way around you loose gain.
On the rcv side some rcvrs want to see a bit of current draw to say an
antenna is attached.
Regards
Paul
WB8TSL
On Thu, May 2, 2013 at 3:26 PM, Paul
Ah-ha, it was you that bought the 2 CSACs from eBay to put them into the
sushi...
On Thu, May 2, 2013 at 10:51 PM, Tom Van Baak t...@leapsecond.com wrote:
ADEV_Free_Run.pdf
ADEV_CSAC_Final.pdf
Said,
You can update your marketing literature. My measurements of your
GPSDO-CSAC are more
Ah-ha, it was you that bought the 2 CSACs from eBay to put them into the
sushi...
No, but if those that have CSAC would get in touch with me I could make more
plots.
/tvb
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I fully agree with Chris, do not trust Google Earth for any serious
technical use, I found errors in 100-200 m range. You only need to
check where two images are stitched.
Google Earth images are not produced by Google, they get them from other
companies or government bodies involved in making
Hi
Warmup time on an Rb is going to be a that depends sort of thing (just like
anything else). One would *hope* that you could get to 0.1 ppb of final
frequency in 10 minutes from normal boat temperatures. That may or may not be
what the particular unit you get at auction is doing.
Next
I'd like to perform some comparison between a known good GPSDO and some
newcomers.
I want to adjust the crystal turning point as my new GPSDO tend to wander all
over the place.
I see some of you are using the hp 3575A to do this.
Unfortunately, they are a little out of my price range at the
Use a GPSDO. Your GPS may even have a 1pps. For what you have in mind you
may not even need a OCXO. Use a TCXO.Your power will be way down.And on
your boat most the time you will have horizon to horizon view. Focus is on
celestial navigation. How you get the time is secondary and GPS will
Hi
FIrst step is to fire up the 5370B counter and see if it works. If there's a
problem re-seat all the boards and see if that fixes it. Simple way to check it
is to let it count it's own reference.
Once you have that working, then yes, measuring time between PPS outputs is the
way to go.
Meditating on this a bit, I assume in a strict sense, you can only consider
GPSDOs phase locked if they are disciplined from the same GPS.
Or is this being pedantic?
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On Thu, May 2, 2013 at 5:51 PM, time-nuts-requ...@febo.com wrote:
A distribution amplifier (like the 58516A) should also be OK. If you are
going to have a GPS receiver that can provide 5V to the antenna and
amplifier, that would be ideal.
Yes, my plan was to attach a 5V receiver to power in
It is as you said Bob, I plugged the 5370b in and It flashed a zero then the
display and front panel are blank.
It has some other equipment in service on top of it so when I get a chance for
some downtime, I'll pull it out and reseat the boards.
Wish me luck!
mark
-Original
After unscrewing the great stack of (no longer used) GPIB cables, I noticed the
wee switch on the back was set to external reference with no external reference
plugged in!
Switching this to internal, the timer burst into life.
We have green to go on the 5370B, Houston!
mark
-Original
According to http://www.realhamradio.com/z3801a-turning-point.htm they use a HP
3575A phase meter to perform the measurement.
Or perhaps I have misinterpreted the whole thing?
I do have a temperature controlled workshop that is always 24 degrees so
hopefully thermal drift won't be too much of
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