A couple of points I discovered while building these things.
This morning I got an Adafruit Ultimate (MTK3999) and a uBlox neo-6M module.
The first thing I discovered after looking at the specs , was that both have
on board LDO 3.3V regulators, so you can feed them 5V without harm. I had
I have done a PCB that has connectors/mounting holes for the Adafruit, Crius
CN06 (uBlox Neo 6M), and Resolution-T and -SMD receivers. It has a DB9, 3.3V
regulator, and MAX232A chip. It can drive the 1PPS signal (either polarity) to
the CD signal on the DB9. Power to the circuitry can be
, 2014 1:56 PM
Subject: Re: [time-nuts] New timing receivers?
I don't see that behavior. Looking at ~24 hours of data I have 1,024
unique (x,y) coordinates (as reported by the GGA sentence). The standard
deviation of the error relative to the median (x,y) position is 1.2 meters.
Paul,
I
On Sun, 27 Apr 2014 20:43:44 -0700
Hal Murray hmur...@megapathdsl.net wrote:
The uBlox-6 has a free running osc. If it wasn't free running, it would be a
GPSDO.
Their new LEA-M8F seems to be a GPSDO. The 30.72MHz output frequency
suggests the intended use in cell phone base stations.
To: time-nuts time-nuts@febo.com
Sent: Sunday, April 27, 2014 8:05 PM
Subject: Re: [time-nuts] New timing receivers?
I spent some time reading the uBlox-6 documentation. I found the TIM-TP ubx
message and format. I see that there is also the ability to feed back to
the uBlox-6 time shift info
Bob wrote:
It's been a few years since I played with the TBolt delay. At least
on the one I messed with, it only did modulo 100 ns moves. Anything
finer grained than 100 ns simply was ignored.
That is true of the jam synch (used when the current PPS timing is
off by more than 50ns,
On Mon, Apr 28, 2014 at 1:08 AM, Mark Sims hol...@hotmail.com wrote:
I was playing with an Adafruit GPS, it appeared that if it thought you
were not moving it would go into a pseudo-position-hold mode and the output
coords would not change.
I don't see that behavior. Looking at ~24 hours
I don't see that behavior. Looking at ~24 hours of data I have 1,024
unique (x,y) coordinates (as reported by the GGA sentence). The standard
deviation of the error relative to the median (x,y) position is 1.2 meters.
Paul,
I agree. I have 30 days of Adafruit data; the position is never
On Mon, Apr 28, 2014 at 1:08 AM, Mark Sims hol...@hotmail.com wrote:
When I was playing with an Adafruit GPS, it appeared that if it thought
you were not moving it would go into a pseudo-position-hold mode and the
output coords would not change. It took it a while to start outputting new
In message CAKyJ6kZqOiByDU_CwkZpPiuvzigGh+mqe4O=dpwzz4wo9gr...@mail.gmail.com
, Paul writes:
Sawtooth (quantization) correction is probably the defining characteristic.
Position Hold is what makes a GPS receiver timing, the sawtooth correction
is icing on the cake.
--
Poul-Henning Kamp
On Sat, 26 Apr 2014 22:36:27 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
How does the u-bloc's performance compare to the M12+T?One of these is
on my list of things to buy someday. I thought the M12+T had a 1-sigma
error in the single digit nanoseconds.The u-bloc is newer
Hi
You might want to actually measure the GPS modules to look at their
performance. Some of them (like the uBlox) can do much better than the
published specs.
Bob
On Apr 27, 2014, at 4:25 AM, Attila Kinali att...@kinali.ch wrote:
On Sat, 26 Apr 2014 22:36:27 -0700
Chris Albertson
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, April 26, 2014 10:36 PM
Subject: Re: [time-nuts] New timing receivers?
How does the u-bloc's performance compare to the M12+T?One of these is
on my list of things to buy someday. I thought the M12+T
to pay the higher price,
then check out the ublox-6T.
/tvb
- Original Message -
From: Chris Albertson albertson.ch...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, April 26, 2014 10:36 PM
Subject: Re: [time-nuts] New timing
W2GPS
-Original Message-
From: Tom Van Baak [mailto:t...@leapsecond.com]
Sent: Sunday, April 27, 2014 9:45 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] New timing receivers?
For a nice comparison of the M12+T, M12M, and ublox-6T, start with page 34
...@cnssys.com
To: 'Tom Van Baak' t...@leapsecond.com; 'Discussion of precise time and
frequency measurement' time-nuts@febo.com
Sent: Sunday, April 27, 2014 1:10 PM
Subject: RE: [time-nuts] New timing receivers?
Tom,
There is an important error in your message below. The Motorola designed
M12M receiver
: W2GPS
Subject: Re: [time-nuts] New timing receivers?
Hi Rick,
Thanks very much for the correction, and for the additional information.
Glad to hear the M12M is still around. That's good news for all of us.
But then can you explain what you meant in your PTTI paper when you said:
Anticipating
I spent some time reading the uBlox-6 documentation. I found the TIM-TP ubx
message and format. I see that there is also the ability to feed back to
the uBlox-6 time shift info for the PPS in 1ns increments.
Does it make sense to feed the TIM-TP info back this way to provide
correction?
Or is an
...@jtmiller.com
To: time-nuts time-nuts@febo.com
Sent: Sunday, April 27, 2014 8:05 PM
Subject: Re: [time-nuts] New timing receivers?
I spent some time reading the uBlox-6 documentation. I found the TIM-TP ubx
message and format. I see that there is also the ability to feed back to
the uBlox-6 time
On Sun, Apr 27, 2014 at 2:14 AM, Poul-Henning Kamp p...@phk.freebsd.dkwrote
Position Hold is what makes a GPS receiver timing, the sawtooth
correction
is icing on the cake.
I've been curious about this for a while:
SkyNav says the SKG16 (based on the MT3329) has a timing accuracy of 60ns
j...@jtmiller.com said:
I spent some time reading the uBlox-6 documentation. I found the TIM-TP ubx
message and format. I see that there is also the ability to feed back to the
uBlox-6 time shift info for the PPS in 1ns increments.
Does it make sense to feed the TIM-TP info back this way to
When I was playing with an Adafruit GPS, it appeared that if it thought you
were not moving it would go into a pseudo-position-hold mode and the output
coords would not change. It took it a while to start outputting new coords
when you started moving again. This test was at walking speeds.
I'm reading though the manual for my recently acquired M12+T which I'm
looking forward to using.
I notice that the manual is dated 09FEB05.
So the M12+T has been around for about a decade.
Are there more recent timing receivers available now or has the ubiquity of
the consumer GPS market
Hi
There are a number of timing receivers on the market. They still are a very
small percentage of the total units sold. A lot of people play with the uBlox
parts.
Bob
On Apr 26, 2014, at 7:59 PM, Jim Miller j...@jtmiller.com wrote:
I'm reading though the manual for my recently acquired
Have a look for Navsync CW12-TIM. We'll be using these for various timing
applications including a simulcast radio repeater system over IP. They're
about US$89 from SemiconductorStore.com.
Many thanks!
On Sun, Apr 27, 2014 at 9:59 AM, Jim Miller j...@jtmiller.com wrote:
I'm reading though the
...@rtty.us
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Saturday, April 26, 2014 7:27 PM
Subject: Re: [time-nuts] New timing receivers?
Hi
There are a number of timing receivers on the market. They still are a very
small percentage of the total units sold. A lot
...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, April 26, 2014 7:27 PM
Subject: Re: [time-nuts] New timing receivers?
Hi
There are a number of timing receivers on the market. They still are a very
small percentage of the total
And quite a few companies use them.
In a message dated 4/26/2014 8:27:57 P.M. Eastern Daylight Time,
li...@rtty.us writes:
Hi
There are a number of timing receivers on the market. They still are a
very small percentage of the total units sold. A lot of people play with the
uBlox parts.
On Sat, Apr 26, 2014 at 7:59 PM, Jim Miller j...@jtmiller.com wrote:
Are there more recent timing receivers available now
Yes. Google gps timing receiver for a start. Sawtooth (quantization)
correction is probably the defining characteristic. So even though u-Blox
makes 'T' versions (e.g.
How does the u-bloc's performance compare to the M12+T?One of these is
on my list of things to buy someday. I thought the M12+T had a 1-sigma
error in the single digit nanoseconds.The u-bloc is newer it is even
better?
On Sat, Apr 26, 2014 at 6:02 PM, Paul tic-...@bodosom.net wrote:
On Wed, April 26, 2006 21:30, Brooke Clarke said:
Hi:
Does anyone know about the new u-blox LEA-4T Timing GPS receiver and
time stamp?
http://www.u-blox.com/products/lea_4t.html
I have not seen any reviews on the resolution-T derivates that are
relative new.
Trimble have a new Acutime
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