This is because usually a counter that has the time interval feature
behaves better in time interval mode. As already pointed out here, use
always the time interval mode to take samples for the Allan deviation.
In frequency mode the counter uses average or various tricks to smooth
readings, so
Every timing GPS receiver has the sawtooth information: uBlox, iLotus,
SkyTraq, Trimble just to name someone.
On Fri, Mar 7, 2014 at 2:25 PM, Jim Miller j...@jtmiller.com wrote:
I think the hardware delay line approach is the only solution for a simple
D FF lead/lag phase comparator. It would
Elio (in 2012) has done some work on the FEI rubidium
http://comments.gmane.org/gmane.comp.time.nuts/24826.
On Tue, Mar 11, 2014 at 10:44 PM, Skip Withrow skip.with...@gmail.com wrote:
Hello Nuts,
Looking for some help with an FEI FE-5650A. This is one of the units that
is surplus from the
Monumental...
On Sat, Mar 22, 2014 at 12:25 AM, djl d...@montana.com wrote:
Well done!
Don
On 03/21/2014 03:55 PM, Tom Van Baak wrote:
Designing a GPSDO is a permanent topic of time-nuts, and always invites
lots of opinions and methods.
The net performance of a microcontroller-based
Never seen around anything related to a possible firmware update for
Motorola/iLotus GPS receivers. This, along with, for example, the TBolt
schematic, is one of the time-nuts community Holy Grails.
On Mon, Mar 31, 2014 at 4:10 PM, Edesio Costa e Silva
time-n...@tardis.net.br wrote:
Hello
Other idea than leaving the 6K8 resistor?
On Thu, Apr 3, 2014 at 5:08 PM, Javier Herrero jherr...@hvsistemas.eswrote:
Hello all,
I've a C OCXO (inside a Symmetricom 5045A that is inside an
Oscilloquartz OSA 5585) that refuses to start. It seems that one voltage
regulator is not
C-field in the CSAC?
On Fri, Apr 11, 2014 at 3:19 PM, Gerald Chafee gcha...@gmail.com wrote:
I wonder if a CSAC used as a wristwatch would need constant C-field
adjustment?
On Thu, Apr 10, 2014 at 12:41 PM, Attila Kinali att...@kinali.ch wrote:
On Thu, 10 Apr 2014 10:43:13 -0400
Ronald
In the manual they say from 10Hz to 10MHz so the step at least must be 10Hz.
On Thu, May 15, 2014 at 12:39 PM, Mike Seguin
n1...@burlingtontelecom.net wrote:
Anyone know what the minimum step is on the programmable frequency output of
this engine?
Tnx,
Mike
--
73,
Mike, N1JEZ
A closed
As you can tell from the manual, the M12+ and the M12M will output a
signed -128..+127ns correction from the @@Hn message. In my opinion
you have to start from a fixed delay (an offset) in order to apply the
negative correction. I already have the Dallas/Maxim delay line but
still not used it.
On
-the M12 uses positive TTL serial port logic: a MAX232 or equivalent
is the best you can use to connect the receiver to the PC with theWin
OnCore software
-the M12, by default, doesn't output nothing: use commands to get any
response (or use the WinOncore), no activity can be expected from an
Pin 1 is the serial input and shouldn't be left unconnected. By
default the M12 doesn't talk on the serial line: you must give a
command and get the answer. There are commands to program the M12 to
talk on the serial port every n seconds. First get the manual (there
are many in the wild) for
What about using cables to simulate the reflector? Connecting the
antenna to the receiver using a splitter, two very different length
cables and then a combiner at the receiver's input.
On Fri, Aug 8, 2014 at 9:39 PM, Jim Lux jim...@earthlink.net wrote:
Does anyone have a feel for what the
To take out the reflection angle variation between satellite and
reflector, I think that using cables can help, so that it is possible
to experiment with the multipath sensitivity of the receiver. The
experiment then can continue using a real reflector. The satellites'
position is known and maybe
...and don't forget that it may have a BVA OCXO: it is not clear from
the pictures but I suspect that it has got a BVA inside.
On Sat, Aug 30, 2014 at 2:11 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
Hi Chris,
Hi Magnus,
Thanks for that and also the notes about initial startup. I
A frequency set command in WinOncore? The WinOncore was designed by
Motorola for their receivers using their binary command set, it is
very strange that this software can have a ConnorWinfield/Navsync
proprietary command
($PRTHS,FRQD,frequency_in_MHz[*optional_checksum]crlf) to set
the CW12 output
Take a look at this patent
http://www.google.com/patents/US20130342278 and you will learn how
to build the ultimate time and frequency reference.
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
, Azelio Boriani azelio.bori...@screen.it
wrote:
I skimmed through the patent but did not read it in
detail. There may be some nugget in there that represents something new
but
nothing jumped out at me.
Maybe that is the trick to make money out of a good patent - make 99% of it
rubbish
First take a look here:
http://www.ko4bb.com/Timing/FAQ-2.php
then you have to better illustrate how you take your measurements. Are you
using the time interval measurement? If you are using that method: how are
arranged your start and stop signals? The counter itsef has a minimum of
1.6ns
From gpsinformation.net:
In the frequency allocation filing the L1 C/A power is listed as 25.6
Watts. The Antenna gain is listed at 13 dBi. Thus, based on the
frequency allocation filing, the power would be about 500 Watts (27
dBW).
Now, the free space path loss from 21000 km is about 182 dB.
The best now is the 8607 BVA OCXO from Oscilloquartz (now part of ADVA
optical networking).
On Fri, Oct 3, 2014 at 2:33 PM, Dan Kemppainen d...@irtelemetrics.com wrote:
Hi All,
Considering this old stuff was that good, what's the best that's
currently available now? How does that compare to
Those units (TAS320, TAS520, TAS720) were designed mainly for the
optical drives test and it seems that they are limited to 20ms maximum
time interval measure in time stamp mode, not suitable for PPS
measurements.
On Tue, Oct 7, 2014 at 1:53 AM, wb6bnq wb6...@cox.net wrote:
Dave,
Should have
Usually phase detectors (we prefer to call them Time Interval
Analysers) have data interfaces (RS232, GPIB, LAN). If you build your
own then the interface is up to you: usually an RS232 is the best
choice. The software to use: take a look at the Miles' TimeLab
www.ke5fx.com/timelab/readme.htm or
I found that in the unit with the GPS, near U206, there are 3 resistor
not populated: the squared 10MHz is present, so if resistor are added
and the capacitor (I presume some 100pF) you ruote the 10MHz under the
GPS antenna connector. Resistor are 100OHM, as seen on the unit
without the GPS.
On
It is not uncommon that replacement tubes are not the original ones. See here:
http://www.gigatest.net/datum/cesium_tubes.pdf
You can't do anything else than plugging it in and check the various
voltages. If there is any life left in the tube and the ion pump is
working, you can even experience a
It seems that Mr. Richard of Potato Semiconductor has issued a patent:
http://www.google.com/patents/US7102380
On Sat, Nov 8, 2014 at 6:48 PM, Pete Lancashire p...@petelancashire.com wrote:
Potato Semi's world heardquaters
http://goo.gl/P7vqMT
-pete
On Sat, Nov 8, 2014 at 9:36 AM, paul
The GPGSV is the sentence that reports satellites' SNR. See also:
http://www.gpsinformation.org/dale/nmea.htm#GSV
On Mon, Nov 10, 2014 at 10:59 AM, Lizeth Norman normanliz...@gmail.com wrote:
Rick,
NMEA 0138 is a standard language. Yes it does output the signal
strength and visible sats,
No need to digitize, the article is available here:
http://www.edn.com/design/test-and-measurement/4347165/Circuit-divides-frequency-by-N-1
or here (in .PDF):
ftp://ztchs.p.lodz.pl/PRP/PRP_2006_2007/71102di.pdf
On Fri, Nov 14, 2014 at 8:02 AM, Perry Sandeen via time-nuts
time-nuts@febo.com wrote:
Are you sure you are measuring the 4065A against the Tbolt? TBolt
feeding the start and 4065A feeding the stop and a counter in time
interval mode?
On Fri, Nov 14, 2014 at 3:26 PM, Ed Palmer ed_pal...@sasktel.net wrote:
FYI, I found a source for the PLCC44 version of the STEL-1173 that's used in
At most you need 2.4A (when the two OCXOs are heating up): a 2.5A
supply is needed.
On Fri, Nov 21, 2014 at 6:25 PM, planoph...@aei.ca wrote:
Good day all,
I have been following the discussions as best as I could. I recell seeing
the question asked or at least theorized as to what is the
is indeed 1.0x10^-14…
Bob
On Oct 4, 2012, at 6:11 PM, Azelio Boriani azelio.bori...@screen.it
wrote:
OK, because you think: (Y-X)/100K is the drift of the two clocks for each
second over 100K seconds and for each second I have a 1nS/100K
resolution.
Now think about this: repeat the measure
Crosstalk? With the same signal?
On Tue, Oct 9, 2012 at 4:31 AM, Edgardo Molina xe1...@amsat.org wrote:
Dear Group,
Good evening. I just arrived home after the first day of conferences at
the Electrical Metrology Forum 2012 at Mexico's metrology center CENAM. I
attended several
Is there any difference between what a GPS receiver can receve via
crosstalk or receive directly from the antenna? In my opinion crosstalk is
absolutely less than the last argument about GPS antenna splitters.
On Tue, Oct 9, 2012 at 9:58 AM, Timeok tim...@timeok.it wrote:
Hi all,
In my shack
WWV and WWVB are co-located so at first I will doubt of the clocks. Try to
listen to the WWVB too and compare the two very signals.
On Tue, Oct 9, 2012 at 8:22 PM, paul swed paulsw...@gmail.com wrote:
No idea but no phase modulation is turned on
Paul
On Tue, Oct 9, 2012 at 1:29 PM, JULIAN
Any BVA left?
On Thu, Oct 11, 2012 at 5:07 PM, Paul A. Cianciolo pa...@snet.net wrote:
Hello Folks,
I have for sale 2 Vectron Model 204-888 OCXO's
5 MHzSquare can and uses an SMA output connector
These 2 were used as the reference oscillators in a 14 Ghz satellite
uplink.
Best
Please take care that the S14WI is smart: if it doesn't sense a DC
current on the antenna port then it reports that to the user ports and I
think it can even power off the internal amplifier, this can account for
the observed loss instead of the gain.
On Thu, Oct 11, 2012 at 11:20 PM, Magnus
the possibility be of measuring an 8 way satellite
splitter? The $7 wonders with dc pass through. That looks like a very nice
network analyzer you have.
Regards
Paul
WB8TSL
On Thu, Oct 11, 2012 at 7:05 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 10/12/2012 12:16 AM, Azelio
in (all) decent splitters. The load is usually 200ohms.
The S14WI will actually remove the load towards the receivers when it
detects a short/open condition towards the antenna.
Regards
Paul
WB8TSL
On Thu, Oct 11, 2012 at 7:15 PM, Azelio Boriani
azelio.bori...@screen.itwrote
And, why 12V for the oven? The 10811A manual states from 20V to 30V for the
oven. 12V for the oscillator itself.
On Sat, Oct 13, 2012 at 4:34 PM, Tom Knox act...@hotmail.com wrote:
Sounds like another dead cap.
Thomas Knox
Date: Sat, 13 Oct 2012 14:51:54 +0200
From: rfn...@arcor.de
Use a multimeter to see if the DB25 pin 2 is -12V, if so you have a
standard RS232 serial port. Then connect to it, use a USB-RS232 interface
if necessary, and type SYST:STAT?
you will see the status page out of the Z3805 (use 9600,N,8,1 for the
serial settings).
On Sun, Oct 14, 2012 at 4:18 AM,
5MHz? Then it is doubled to have 10MHz at the output...
On Mon, Oct 15, 2012 at 8:17 AM, Murray Greenman denw...@orcon.net.nzwrote:
Ulrich is right about the use of MTI 260 use in GPSDOs. I have a
Korean-made Z3815A clone (it's labelled Agilent) which has a little
daughter board with a 5MHz
you can also preset the receiver to the factory settings:
:SYST:PRESET
for the SCPI command reference you can see the manual:
www.leapsecond.com/museum/*hp58503a*/097-58503-13-iss-1.pdf
On Mon, Oct 15, 2012 at 2:45 PM, Said Jackson saidj...@aol.com wrote:
Edgardo,
Pretty sure it was 9600
uBlox LEA-5T, LEA6-T? SkyTraq Venus5?
On Tue, Oct 16, 2012 at 11:06 PM, x...@darksmile.net wrote:
Hello everyone,
I started a new project for myself where I would use the RasperryPi Linux
board
as a NTP server.
My goal is to design a custom board for the Pi and mount a GPS receiver on
The iLotus M12M is the direct successor of the Motorola M12+ evolution of
the OnCore series, for what I know. I have designed the first GPSDO for my
company based on the OnCore UT (1999), then just before going into full
production we switched to the M12+ (2000) meanwhile Motorola had become
You should sense the ambient temperature, the OCXO temperature is supposed
to be constant. Sensing the ambient you can anticipate the move of the
OCXO tem,perature controller trying to contrast the variation. Indeed I
have seen in the Morion MV201 that the EFC doesn't go only to its pin but
also
Yes, usually increasing temperature increases frequency, so if you see an
oven current increase then slightly take down the EFC (and the other way
around if the current decreases).
On Thu, Oct 18, 2012 at 12:47 AM, Rick Karlquist rich...@karlquist.comwrote:
Bill Dailey wrote:
If I wanted to
Take care that the 1 satellite timing mode comes after having seens more
than 4 satellites for at least 1 seconds (usually, or greater). You
can't start a timing mode receiver with 1 satellite.
On Thu, Oct 18, 2012 at 9:46 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
From: Hal
You are measuring your counter stability, not the GPSDO stability. A locked
GPSDO is way better than any free running counter if driven by its internal
timebase oscillator.
On Thu, Oct 18, 2012 at 8:39 AM, Rob S. robe...@dcsi.net.au wrote:
Hello Group, first time post
I have just got my
be done.
On Thu, Oct 18, 2012 at 3:35 PM, Mike S mi...@flatsurface.com wrote:
On 10/18/2012 6:17 AM, Azelio Boriani wrote:
Take care that the 1 satellite timing mode comes after having seens more
than 4 satellites for at least 1 seconds (usually, or greater). You
can't start a timing
OK, indeed I was assuming to have the PPS with the best precision anyway.
Well, in this case I agree. Galileo? Yes, I can try with the LEA-5T. I have
to figure out how to set it so that only Galileo SVs are received. And: I
don't think Galileo is meant for EU only, you can test it too. Are the
I had a noisy varactor experience too: in my Tek 492 one day I noticed an
increase in the 0 beat noise and the PLL not working. When I replaced the
2.2GHz conversion varactor all was back to normal.
On Fri, Oct 19, 2012 at 6:54 AM, Tom Curlee tcur...@sbcglobal.net wrote:
I'll second the
Usually a crimp type DB9 can be wired directly to the crimp type IDC
connector, leaving out the pin 10 of the IDC, it is missing in the header.
But, yes, better to test as indicated by Peter.
On Sat, Oct 20, 2012 at 8:34 AM, Hal Murray hmur...@megapathdsl.net wrote:
kuze...@gmail.com said:
And don't forget those NTP people. BTW, is there an NTP packet exchange
example? That is, what is the typical conversation between an NTP server
and a client?
On Mon, Oct 22, 2012 at 7:28 AM, Hal Murray hmur...@megapathdsl.net wrote:
t...@leapsecond.com said:
BTW, the best time frequency
The hump is the DAC update frequency measure: fast update - hump towards
the left, slow update - towards the right. Better update fast or slow:
recently it was pointed out that fast should be better and this will shift
the hump in the 1 to 10 seconds range.
On Mon, Oct 22, 2012 at 1:32 PM, Tom
Yes, the problem is that I don't have anything running NTP... I'm searching
for a packet dump: I should use it to quickly develop the response for a
possible Lantronix XPort implementation.
On Mon, Oct 22, 2012 at 6:22 PM, Hal Murray hmur...@megapathdsl.net wrote:
azelio.bori...@screen.it
OK, thank you.
On Wed, Oct 24, 2012 at 9:38 PM, Attila Kinali att...@kinali.ch wrote:
On Mon, 22 Oct 2012 22:45:27 +0200
Azelio Boriani azelio.bori...@screen.it wrote:
Yes, the problem is that I don't have anything running NTP... I'm
searching
for a packet dump: I should use
When I had (for a very limited time) the SMBV100A from RS loaded with the
GPS simulator, I connected it to the 10MHz and PPS output of my GPSDO.
Unfortunately there was not time enough to take measures... anyway the PPS
output of the GPS under test aligned with the incoming PPS.
On Thu, Nov 1,
You will be using the counter much on the GPIB than looking to the display,
so try to keep the unit untouched. Better to use it and think about another
one, now that you have one, you are not in a hurry so you can select a
better one. You can also hunt for an SR620 or a Wavecrest... 25pS (or less)
to this e-mail and then deleting the message and its attachments from your
computer without keeping a copy. It is strictly forbidden to copy it or use
it for any purpose or disclose its contents to any third party. Thank you.
On Nov 2, 2012, at 10:34 AM, Azelio Boriani azelio.bori...@screen.it
Usually you don't need a BVA to test the single-shot capability of a
counter: a length (say 50nS) of good RF coaxial cable and your preferred
OCXO/Rb/GPSDO should be enough.
On Sat, Nov 3, 2012 at 11:14 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 11/03/2012 09:36 PM, Bob Camp
Try this setup: feed the GPSDO into A and B inputs but not to the
reference. That is, use the counter internal reference to time the
difference so that you have an uncorrelated source that can span all the
interpolator's nonlinearities.
On Mon, Nov 5, 2012 at 11:42 AM, Bill Dailey
Guys,
be aware, first of all, that to correctly test your new GPSDO you need an
already running GPSDO as a reference (and a 10 digits-per-second
interpolating counter). Don't forget/overlook the reference: start always
with a known, good reference.
On Mon, Nov 5, 2012 at 9:12 PM, WarrenS
Very interesting... is it using the binary protocol? Maybe a serial link
error, the binary protocol has a checksum (yes, NMEA too). Check the serial
link levels with a 'scope, maybe that the Z3801 firmware waits to see some
consecutive errors before actually reporting that something is wrong,
special by just Bootstrapping up with home built things.
ws
Azelio Boriani wrote:
Guys,
be aware, first of all, that to correctly test your new GPSDO you need an
already running GPSDO as a reference (and a 10 digits-per-second
interpolating counter). Don't forget/overlook
Never found an Oncore firmware file... can you point me to anyone of them?
I'm curious to see one.
On Wed, Nov 7, 2012 at 1:30 PM, Bob Camp li...@rtty.us wrote:
Hi
There were a *lot* of firmware updates to the Oncores. I don't know if the
re-flash images are still out there or not. If they
I have found this:
http://home.earthlink.net/~davesullins/software/dis51.html
not tested, but it seems good
On Thu, Nov 8, 2012 at 3:12 PM, paul swed paulsw...@gmail.com wrote:
I have no idea on a free disassembler. But there has to be one. Will look
later tonight.
Regards
Paul.
On Thu,
Unfortunately, experience is a lantern lighting the way already done... and
it takes months to forge a good sword: no one should break any sword.
On Fri, Nov 9, 2012 at 10:53 PM, Chris Howard ch...@elfpen.com wrote:
My perpetually drifting 10811 pretty quickly made it to the negative
voltage
The frequency accuracy is related to the conversion process, the sampling
process and the computation that follows. In a sampling VNA the frequency
is extracted after the FFT, I suppose, so I don't think that sampling VNAs
can do any better than a real frequency counter. Sweeping spectrum
Interesting this, but why exactly 60pS? I would expect also something
in-between. That is, to have the 5MHz energy 64dB below, in my opinion
nothing prevents to have the edge to wander not only at 60pS but
continuously between 0 and 60pS. Maybe the SR620, being a 25pS resolution
counter, simply
The XC2C64 has 64 cells and the XC9572 has 72. I recommend to choose
something larger when buying evaluation boards: just in case you think to
go beyond the PPS divider and think to put in also a time interval counter.
Going from the PPS divider to the basic hardware that can make your GPSDO
is a
In my opinion, you should read about GPSDOs anyway. The availability of a
precise PPS or not, should not prevent you from increasing your knowledge.
On Thu, Nov 22, 2012 at 10:26 PM, Fabio Eboli fabi...@quipo.it wrote:
Hello, while asking info about the FE5682,
I realized that for another
and, yes, if your 'scope has the 50ohm/1Mohm input capability, use the 1M
one.
On Sun, Nov 25, 2012 at 12:03 AM, Azelio Boriani
azelio.bori...@screen.itwrote:
Usually the PPS output from the Z-series GPSDO is a 26uS wide (from the
HP58503A datasheet) TTL pulse. To measure it you must use
Usually the PPS output from the Z-series GPSDO is a 26uS wide (from the
HP58503A datasheet) TTL pulse. To measure it you must use a fast
oscilloscope (because of the fast pulse rise time) and an analog or digital
memory (because of the very low repetition rate). The best is to use a
digital
You need a reference to test the PPS output from a GPS receiver. That is,
you need an already running GPSDO so that its stable PPS output can act as
the reference for your test. Then you need a time interval counter and use
the GPS under test PPS as start and the reference PPS as stop (or the
2s.
Using 10s integraqtion time the counter returns 10digits,
showing 100nS resolution. I will collect one reading every
20s, a slow process. Will this setup be enough?
Fabio
Azelio Boriani azelio.bori...@screen.it ha scritto:
You need a reference to test the PPS output from a GPS receiver
Very interesting indeed. Two questions: after adding the 66nS phase shift,
were the two peaks at 66nS when at the same amplitude? Then, while reducing
the amplitude of the 5MHz, were they getting closer (until the 240pS)?
On Tue, Nov 27, 2012 at 9:21 PM, Bob Camp li...@rtty.us wrote:
Hi
Phase
The reference is still the Rb? Then how you can tell which of the two is
doing that...
On Wed, Nov 28, 2012 at 10:24 PM, Volker Esper ail...@t-online.de wrote:
When looking at the PPS TI vs. time curve today I felt kind of appalled -
a big incident peak (not an outlier) on the curve! See
Ops, I missed the EFC value...
On Wed, Nov 28, 2012 at 10:43 PM, Azelio Boriani
azelio.bori...@screen.itwrote:
The reference is still the Rb? Then how you can tell which of the two is
doing that...
On Wed, Nov 28, 2012 at 10:24 PM, Volker Esper ail...@t-online.de wrote:
When looking
Here in Europe the use of GPSDOs has dramatically increased with the
transition to the digital TV broadcasting. The single frequency network
(SFN) mode of transmission requires the presence of a time and frequency
reference. The ETSI has a Technical Report (TR101-190) where the maximum
time and
As usual I cannot refrain to make my mistake: seconds for minutes... yes,
it is 13 minutes not 13 hours.
On Sun, Dec 2, 2012 at 3:54 AM, Bob Camp li...@rtty.us wrote:
Hi
On Dec 1, 2012, at 8:13 PM, saidj...@aol.com wrote:
Hi Magnus,
yup, at the levels we are interested in, a prefix or
Isn't the FSUP a 110K euros equipment 20Hz-50GHz capable? 125KHz shouldn't
be a problem. I had an FSUP for 25 seconds to play with... really
impressive but too limited test time to appreciate fully.
On Wed, Dec 5, 2012 at 1:14 PM, Bob Camp li...@rtty.us wrote:
Hi
Just about any of the high
Don't forget that an OCXO needs faster than 10K seconds EFC updates, that's
why you need resolution first.
On Wed, Dec 5, 2012 at 10:24 PM, Volker Esper ail...@t-online.de wrote:
Am 05.12.2012 18:31, schrieb Bob Camp:
Hi
If the intent is to come up with something in the same league as the
, 2012 4:33 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Very challenging phase noise measurement, does
anyone have an idea??
For phase noise the frequency range is 1MHz to 8/26.5/50GHz
The spectrum analyzer works from 20Hz to max.
Adrian
Azelio
This last idea is interesting... could be simulated by Matlab or similar.
On Wed, Dec 5, 2012 at 11:34 PM, Marek Peca ma...@duch.cz wrote:
running mode and lock the other one to the first one using an XOR gate and
then use the output of the XOR gate as an output signal. However, we are
Yes, this is a good test: to evaluate how your preferred uP can perform as
a time interval counter, you can hook two GPDSOs' PPS to it and see the
result. The best would be to have at hand also a real TIC (HP53132A,
PM6681, SR620 or similar) and compare.
On Sat, Dec 8, 2012 at 4:28 AM, Bob Camp
for a known delay to the stop pulse.
Don L
Azelio Boriani
Yes, this is a good test: to evaluate how your preferred uP can perform
as
a time interval counter, you can hook two GPDSOs' PPS to it and see the
result. The best would be to have at hand also a real TIC (HP53132A,
PM6681, SR620
Is the parity bit P3 consistent? It protects the day of the month and that
of the week.
On Sun, Dec 9, 2012 at 1:24 PM, mike cook mc235...@gmail.com wrote:
Le 09/12/2012 11:28, Tom Harris a écrit :
Greetings Time Nuts.
Time related, but unusually so:
I am examining the DCF77 (see
31-bit is 186dB... with what do you compare that device? What kind of
reference is needed?
On Sun, Dec 9, 2012 at 11:18 PM, Bob Camp li...@rtty.us wrote:
Hi
It's the big brother of the ADS127x parts that I mentioned a little
while back. I'm sure it works quite well. The 127x's are fine
-delta converters. Nonetheless 20 bits
indicates a matching reference would have to hold 1PPM over temperature, no
simple task.
Bob LaJeunesse
From: Azelio Boriani azelio.bori...@screen.it
To: Discussion of precise time and frequency measurement
time-nuts
I think that the TBolt's schematic(s) are sort of HolyGrail for TimeNuts.
On Tue, Dec 11, 2012 at 11:43 PM, Tom Miller tmil...@skylinenet.net wrote:
You might try doing a cold reset. I had the same issue and that got it
back.
You need to use the trimble software.
Tom
- Original
, Azelio Boriani wrote:
I think that the TBolt's schematic(s) are sort of HolyGrail for TimeNuts.
They are pretty simple, so I am amazed that there has been no major
attempt to reverse engineer them. The GPS front-end chip I haven't been
able to find a datasheet for, and then the CPU/GPS
Yes, this is the typical GPS receiver PPS wander. It is usable for a GPSDO
as it seems of timing quality (the Motorola M12M is -20nS..+20nS over 10
days).
See:
http://www.jackson-labs.com/assets/uploads/main/Motorola_M12.pdf
on page 7.
On Thu, Dec 13, 2012 at 2:47 PM, Bob Camp li...@rtty.us
Try here:
http://www.ke5fx.com/heather/readme.htm
LH has not a real manual but a list of command line options. I see that
there are many out there who (like me) still appreciate the command line
way of using computers.
There is also the command line kung-fu, for example:
The 1998 Shera QST article was also my first reading about GPSDO. In 1999
we were using the Epsilon OEM board GPSDO from Temex for the first
terrestrial DVB single frequency network trials.
On Wed, Dec 19, 2012 at 10:33 PM, paul swed paulsw...@gmail.com wrote:
Bert
Thank you for reaching out
It depends on how long to wait for that last digit to be meaningful...
On Thu, Dec 27, 2012 at 8:12 PM, Paul Amaranth p...@auroragrp.com wrote:
Did anyone see the article in the December Silicon Chips magazine about
building a 12 digit 2.5 GHz counter? It has an option for a GPS 1pps
input
digits (at, say, 100MHz input frequency) only if you wait 1000 seconds.
On Thu, Dec 27, 2012 at 9:28 PM, Azelio Boriani azelio.bori...@screen.itwrote:
It depends on how long to wait for that last digit to be meaningful...
On Thu, Dec 27, 2012 at 8:12 PM, Paul Amaranth p...@auroragrp.com wrote
Which reference did you use to time your measurements?
On Fri, Dec 28, 2012 at 9:32 PM, Tom Holmes thol...@woh.rr.com wrote:
Seems like I saw an article in QEX a year or two back where a guy did just
that, except he used a single 5 MHz oscillator and used the mixer to make a
doubler, but that
The GPS system was designed to transfer time anywhere in the world (and for
navigation, of course) and so your answer is yes. If the GPS receiver is a
timing grade unit then you can expect under 100nS accuracy (to UTC) and
stability over time of the PPS.
On Fri, Dec 28, 2012 at 8:49 PM, Dan
STMicroelectronics has a 37 pages paper
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/DM00030825.pdf
on the ethernet hardware time stamping MAC of the STM32M107. The National
DP83640 hardware time stamping PHY is another example (and was already
pointed
Yes, we have yet another proof that the oscillator in (cheap?) GPS
receivers can be a source of troubles... shall we start to design Ovenized
GPS Receivers (OGPR) too? Or ovens for GPS receivers.
On Fri, Dec 28, 2012 at 11:35 PM, Bob Camp li...@rtty.us wrote:
Hi
The GPS does an estimate
Aha, it was you... I was about to buy that GPSDO when it suddenly
disappeared. Well done, Oscilloquartz products are not common on the usual
auction site as it is hard to find their complete documentation.
On Sat, Dec 29, 2012 at 1:57 AM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
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