Re: [time-nuts] Low CostTemperature sensor

[Jason Ball]

Even cheaper... Diiode as a cheap sensor ?

https://www.arrow.com/en/research-and-events/articles/using-a-simple-diode-as-a-ballpark-temperature-sensor


On Tue, Jan 17, 2017 at 4:16 PM, Bill Hawkins  wrote:

> Perrier,
>
> Google finds a Siemens NI1000 sensor that follows the nickel curve.
> Nickel is popular in industrial control for cost, but not as accurate as
> platinum. Converting the platinum curve to accurate temperatures
> requires a second order equation, but has been done with 0.1% analog
> converters.
>
> Digi-key has ZNI devices as surface mount parts. Sparse data said
> nothing about a platinum curve.
>
> I'm curious because my former employer did very well selling platinum
> RTD sensors, usually 100 ohms at the triple point.
>
> Bill Hawkins
>
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Perry
> Sandeen via time-nuts
> Sent: Monday, January 16, 2017 9:33 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] Low CostTemperature sensor
>
> List,
> A while back there was much discussion about temperature sensors.
> One simple inexpensive one to consider would be the ZNI1000Temperature
> sensor.
> It's 1K ohms at 0C and it replicates the temperature curve of the Pt 1K
> ohm sensors.
> It's about $3 from Digi-Key.
> FWIW YMMY
> Regards,
> Perrier
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Re: [time-nuts] Seiko watch "leap second enabled"

[Jason Ball]

The watch is fine.  Ive intentionally set it to be off time to have it
automatically recover with essentially leap second precision.

On 21 Jul 2016 3:25 p.m., "Mike Cook"  wrote:

> While I was googling for reports of other misbehaving GPS chips, I
> discovered the existence of the worlds first leap second enabled wrist
> watch.
> Seiko introduced the Astron models 8X53, 8X82, 7X52 which automatically
> check for a leap second on …….
>
> «  Seiko Astron enters the leap second data receiving mode after the first
> GPS signal is received on or after June 1st and December 1st. »  (User
> Manual)
>
> D’OH!…
>
> Maybe one of Homer’s inventions.
>
> If any of you have one, have you checked how it has reacted?
>
>
> "The power of accurate observation is commonly called cynicism by those
> who have not got it. »
> George Bernard Shaw
>
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Re: [time-nuts] Timelab Query (likely noob error)

[Jason Ball]

Thanks John.

Definite Noob issue.   It helps to have the counter in the correct mode as
well ;)

All working as it should be now.

Cheers
Jason.


On Sat, Oct 24, 2015 at 7:54 PM, John Miles <j...@miles.io> wrote:

>
> > -Original Message-
> > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Jason
> Ball
> > Sent: Friday, October 23, 2015 10:38 PM
> > To: Discussion of precise time and frequency measurement
> > Subject: [time-nuts] Timelab Query (likely noob error)
> >
> > Hi all,
> >
> > I'm afraid this may be a noob question as I've undoubtedly done something
> > wrong, either that or I have some phenominal time sources... more likely
> > I've made an error in an assumption or two.   This should to my mind be
> > within the capabilities of the counter I have, but right now I'm starting
> > to wonder.
> >
> > The problem is I'm seeing a 10s tau of 9.29E-18 which to my limited
> > understanding is highly doubtful.
> >
> > So what have I done wrong ?
> >
>
> Hi, Jason --
>
> Let's take a look at the .tim file (email it to j...@miles.io) --
> probably just a missing/inappropriate scale factor.
>
> -- john, KE5FX
> Miles Design LLC
>
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Re: [time-nuts] New Symmetricom 58532A antennas - Launch3

[Jason Ball]

Thank you ;)

On Fri, Oct 2, 2015 at 5:19 AM, Gregory Beat  wrote:

> I received this e-mail earlier today (below) from Launch3.
> Launch3 has been selling surplus/overstock cellular/telecom equipment.
> They currently have a LARGE supply (~750) of surplus Symmetricom 58532A
> antennas.
>
> Symmetricom 58532A GPS Antenna -- Datasheet
> http://www.microsemi.com/document-portal/doc_view/133381-58532a
>
> I acquired one of these antennas 2 weeks ago, they are brand new in box.
> My 58532A antenna is currently connected to a Symmetricom/Datum TS2100 GPS
> w/Heol N024 receiver upgrade.
>
> Check their web site and contact them (web page info), with number you
> desire,
> so they can determined shipping charges.
>
> Greg
> w9gb
> 
> From: Launch3
>
> Hello
>
> You previously purchased or inquired about the Symmetricom 58532A GPS
> Antennas, we are currently liquating all 750 of them.
> They are all New in Box and the price is $25 each + Shipping
>
> Link to the part -  https://www.launch3telecom.com/symmetricom/58532a.html
>
> Launch3Telecom.com
> Launch3Services.com
> 27 Daniel Rd.
> Fairfield, New Jersey 07004
>
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[time-nuts] HP 5372A available in Sydney, Australia

[Jason Ball]

Since its a relevant piece of kit I've included the mail from ARNSW here.
Two units are available if anybody is interested.

Cheers.



HP 5372A and Wave Technologies DTS2070 digital time system.


Amateur Radio NSW as for sale two HP 5372A time and interval analysers.
Both are working with good displays. They have been tested on both inputs
for the basic frequency and time measurement functions.

Spare input modules are available as are some spare boards. They did not
come with manuals.

Also one Wave Technologies DTS2070 Digital time measurement system. Powers
up OK and was in use when removed for sale.

These can be viewed at the club rooms at 63 Quarry Rd Dural. Prospective
buyers are welcome to test the equipment.

Please contact by email at arnsw.sa...@gmail.com . The HP5372As are
advertised on the ARNSW web site at
http://www.arnsw.org.au/html/page_disposals.html





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Re: [time-nuts] Has my TBolt gone south ?

[Jason Ball]

Or if your in Australia, a cockatoo.   I've had to rerun my coax twice over
the past 12 months 

On Thu, Aug 13, 2015 at 9:18 AM, William Beam wb...@gci.net wrote:

 A nearby thunderstorm could have taken out the preamp in the antenna.

 73 Bill Beam
 NL7F
 - Original Message -
 From: Discussion of precise time and frequency measurement
 To:
 Cc:
 Sent:Wed, 12 Aug 2015 23:29:45 +0200
 Subject:Re: [time-nuts] Has my TBolt gone south ?

  On 8/12/2015 8:29 PM, Hal Murray wrote:

   How long did you wait after turning it on?
   How good is your antenna position?
   Did you tell it to remember the location after a survey finished?
  
   If it's been off for a few weeks, it doesn't know where the
 satellites are.
   To get started, it has to find one by a brute force search. With a
 good
   antenna, that doesn't take very long. Then it takes 15 minutes to
 collect
   the satellite info. With a poor antenna location, it takes longer,
 maybe a
   lot longer.

  Thanks Hal for your answer.

  My TB now is switched on since yesterday, but no satellites are
 acquired...
  Last time I switched it on, it worked, and, even after a long off
 period, it did take not more than
  a few minutes to acquire the first satellite.

  Yesterday, after I saw that no satellites did show up in LH, I issued
 the ! command to do a cold reset,
  just to see if it could be of help.

  My antenna is a timing antenna, on the chimney of my house,
 completely free from obstacles.
  There is the possibilities that a thunderstorm has broken its small
 mast, tomorrow I will check.
  This seems to be the only reasonable cause of the malfunction... the
 TB accepts commands
  and sends back status info. Unless its GPS receiver has developed a
 fault..

  73 Alberto I2PHD

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Re: [time-nuts] Lab upgrade

[Jason Ball]

The fault was found by somebody with a heck of a lot more experience than
yours truly.

Turns out the 5v regulator had shorted out, a protection diode did it's
thing and popped the fuse protecting the rest of the system.

J.
On 29 Jul 2015 2:49 am, Robert LaJeunesse lajeune...@mail.com wrote:

 One of the cheap and dirty ways to find a short is current tracing. Use a
 voltage and current limited source and a matching detector to find where
 the current flows. I've used a current limited DC supply as the source and,
 for the detector, an old DVM with 10uV resolution. For an AC approach a
 simple audio oscillator (or function generator) works nicely as the source,
 while a the detector starts with an audio playback tape head (from an old
 VCR), then some sort of amplifier-speaker, or maybe just an oscilloscope.
 If you are lucky you have an old HP logic pulser and current tracer set
 that do the same thing...

 Bob L.

  ...
 
  I'll buzz out the pins on  the connnector there and see if I can find the
  probably short and let people know.
 
  Cheers
  Jason

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Re: [time-nuts] Picked up the Austral 2200A tonight

[Jason Ball]

A lack of precision in that last email from me it seems.

I was planning on using a DDS and re-purposed multiplier board to provide
the 1.5Ghz LO, but as the time server needs to use the 10MHz signal to
compensate for phase shift this won't necessarily work out as you have
indicated.The multiplier board I have _should_ work using a 500Mhz
input and tuning the pass filter to the third harmonic while maintaining a
sufficient drive for the mixer.

Your right on the DDS resolution and lack of reference, I may scrap that
plan have to look at a 10Mhz referenced PLL for the input frequency instead.

I haven't gotten to the IF filter yet :/

I have to admit a certain temptation to simply pull the rubidium and put it
in a box or repurpose the existing box.  It would be a shame to waste such
a nice piece of obsolete tech though.

I have noted a number of blown caps on the voltage regulator board so some
repair work needed there.   I can not fund the battery backup yet for the
configuration settings..  Either its hidden, missing, or I'm having a
stupid moment

I was under the impression that none of these units were Y2K compliant,
however this unit happy accepts dates post Y2K.  I can't comment on the GPS
rollovers though.

Cheers
J.


Thanks for the help.

Cheers
Jason.

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[time-nuts] Picked up the Austral 2200A tonight

[Jason Ball]

Just picked it up, it has an internal rubidium which piqued my interest as
worst case I could cannibalize the unit.  It's also been sitting on a shelf
for  10 years so the oscillator should hopefully have some life left in it.

What does surprise me is the firmware is dated 25th August 1998, I was of
the opinion these units weren't Y2K compliant and would have assumed an
update in 1998 would have been tested...   gps rollover not withstanding.

Is there anyway to get the 10MHz output running off the rubidium without a
satellite lock ?   I can't seem to trigger it just yet.

My plan is to use a DDS to generate a 1.Ghz LO and to feed this into a
suitable mixer to down convert to the 75.42Mhz input signal for the gps
reference as a start to see if I can get the thing working, allowing for
the 1024 week offset of course.  Just waiting on parts at the moment.

Cheers
J.


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Re: [time-nuts] Lab upgrade

[Jason Ball]

Ok - not so bad.

One of the 250v 5Amp inside the case blew on the 10v line.   Now to work
out why...

J.


On Sun, Jul 26, 2015 at 1:05 PM, Jason Ball ja...@ball.net wrote:


 Recently I've been on the hunt for test gear so facilitate moving up into
 the microwave bands (ham radio), accurate timing being one of the basics to
 be sorted.   As part of this I've recently acquired a HP 5335A with OCXO
 and HP5350B microwave frequency counter, both picked up today.

 I've setup a test stack using a stanford research function generator and
 my existing HP 5384A counter to compare all the kit, it was nice to see
 everything lock in within +5Hz @ 10MHz using only the internal reference.
 I'll have a GPSDO running in a couple of days to provide an external
 reference as well.

 Unfortunately after running for 15 minutes the HP 5335A literally went
 'clunk' and now has no display which is disappointing as I wanted some of
 the measurement functions this unit provides.   There's no odd small (for
 an old system) so I'm hoping its a reasonably simple problem, I'll open the
 case tonight.

 Does anybody have any experience with issues on the HP 5335A's ?

 Cheers
 j.


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[time-nuts] Austron 2010B useful in Australia/Sydney at all ?

[Jason Ball]

I can pick one up in excellent condition for a reasonably low price...  but
only if it could be useful.

J.


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Re: [time-nuts] Lab upgrade

[Jason Ball]

Thanks for that Bob.

From the circuit diagram the path to ground appears to be on either the 3v
the 5v lines that are fed via this fuse.   When I disconnect the power
supply from the rest of the system the fuse doesn't blow which suggests the
fault is in the logic board, of course it could simply mean that connector
completes the circuit.

I'll buzz out the pins on  the connnector there and see if I can find the
probably short and let people know.

Cheers
Jason.

On Mon, Jul 27, 2015 at 7:06 AM, Bob Camp kb...@n1k.org wrote:

 Hi

 Look for electrolytic / tantalum  capacitors on the 10V rail with scorch
 marks….

 Bob

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Re: [time-nuts] Austron 2010B useful in Australia/Sydney at all ?

[Jason Ball]

I've decided to pick up this unit as it is in really nice condition and
inexpensive.

I'll see if I can pickup the e-loran signals on my ham kit over that
weekend to see if there is any point, failing that another member of time
buts may be interested.

J


On Mon, Jul 27, 2015 at 9:27 AM, Jason Ball ja...@ball.net wrote:


 I can pick one up in excellent condition for a reasonably low price...
  but only if it could be useful.

 J.


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[time-nuts] Lab upgrade

[Jason Ball]

Recently I've been on the hunt for test gear so facilitate moving up into
the microwave bands (ham radio), accurate timing being one of the basics to
be sorted.   As part of this I've recently acquired a HP 5335A with OCXO
and HP5350B microwave frequency counter, both picked up today.

I've setup a test stack using a stanford research function generator and my
existing HP 5384A counter to compare all the kit, it was nice to see
everything lock in within +5Hz @ 10MHz using only the internal reference.
I'll have a GPSDO running in a couple of days to provide an external
reference as well.

Unfortunately after running for 15 minutes the HP 5335A literally went
'clunk' and now has no display which is disappointing as I wanted some of
the measurement functions this unit provides.   There's no odd small (for
an old system) so I'm hoping its a reasonably simple problem, I'll open the
case tonight.

Does anybody have any experience with issues on the HP 5335A's ?

Cheers
j.


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[time-nuts] Austron 2200A

[Jason Ball]

While I may be counting chickens, I'm likely to take delivery of an Austron
2200A in the next week.  Somewhat predictably the antenna isn't included
and I've seen the extensive thread from this mailing list circa 2007 where
the thread seemed to peter out at the end.  Worst case I could probably
pillage the (working) rubidium oscillator that's inside it, ideally it
would be nice to get the unit working as is.

Did people end up getting their Austron's up and running ?

At the moment I'm looking at options to make a down converter to deliver
the 75.3Mhz required for the Austron and to power a timing antenna with 5v
LNA that I have sitting on the shelf.   There are some 23cm amateur kits
that would be adapted for the mixer unless there is a 'simpler' solution
I've missed.

Any suggestions ?

Cheers

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Re: [time-nuts] 10MHz Square to Sine Wave Conversion

[Jason Ball]

A would have thought a simple band pass filter would do the job by tuning
out the harmonics.

On Fri, Jul 17, 2015 at 3:49 AM, skipp Isaham via time-nuts 
time-nuts@febo.com wrote:

 re: 10MHz Square to Sine Wave Conversion

 The GPSDO I recently acquired outputs a 10 MHz square wave. I'd like
 to convert it to a sine wave and I am looking for suggestions and info re
 any reasonable pre-made circuits and/or boards. No sense reinventing the
 wheel if I can avoid it.

 Otherwise I will start from scratch and make a new wheel

 Thank you in advance for your replies.

 Regards,

 skipp

 skipp025 at yahoo dot com

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Re: [time-nuts] New wrist watch

[Jason Ball]

I did much the same thing, but settled on the Seiko astron due to the lack
of LF time sync in Sydney. GPS for the win and satisfying the closet
horologist in me.

J
On 7 Jul 2015 3:22 pm, D W watsondani...@gmail.com wrote:

 With my new found interest in time nuttiness I thought I should upgrade to
 a decently accurate watch. I had some features I was looking for and
 settled on a Casio Wave Ceptor. My second choice was an Eco Drive, but the
 Casio had the right mix of features at a good price.

 As I was sitting outside reading the manual after buying it, I laid it
 flat on the table and started a manual sync to WWVB. The UI is pretty
 intuitive for having so few buttons and indicators. It quickly told me that
 it had found a stable signal, and about six minutes later it was synced.
 Pretty cool.

 Anyone know what the drift is like in this watch if it can't find the
 signal for several days/weeks? I would hope that actual performance is a
 little better than the +/- 15 sec per month stated in the manual. I should
 trap it in a faraday bag for a while to test it...

 Dan
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Re: [time-nuts] Time in a cave

[Jason Ball]

If you don't require an accurate external sync (GPS), one options is to use
solarflare 10GB NIC's with the high resolution clock on board, using this
clock to govern the PC clock.Running PTP through this can yield +-250ns
synchronisation between the nodes due to the hardware implementation for
the PTP stack and does support external sync to a GPS PTP signal if
available.

I have no association with the company, but I like the product.

http://www.solarflare.com/Precision-Time-Synchronization-PTP

J.

On Wed, May 13, 2015 at 9:00 AM, Tucek, Joseph joseph.tu...@hp.com wrote:

 I'm looking for information on non-GPS time sources.

 For background, I need to provide PTP to a cluster where we don't have
 line of sight to the sky, and are unlikely to get roof-rights without a
 fight.  There are CDMA solutions that would work (e.g. Endrun
 Technologies), but I was wondering if there were any other options.  I
 either need an indoor capable PTP, or an indoor capable PPS.  Microsemi
 claims to have an indoor capable GNSS system, but I've yet to find a
 sales rep to talk about it; if anyone has a link to one who can, I'd love
 to find out the problems^W^W^W^W talk to them about it.

 For an example of something that almost but doesn't quite work, Beagle
 Software has a CDMA NTP server, but they do neither PTP nor PPS in the CDMA
 version.  Similarly, Meinberg will sell a PTP unit that freeruns (if you
 override the config), but they have no solution to discipline via CDMA.

 I'm also curious if anyone has any idea about non-GPS time sync after CDMA
 gets turned off (can I get time from 4G?).

 My endgame worst case is to just do PPS from a stratum 2 NTP (or even a
 freerunning oscillator) and lie to my PTP server; hard sync to UTC is a
 secondary concern so long as the cluster agrees with itself.  Endrun is
 looking pretty good, but I'd really like to have a second option to compare
 against.

 -Joe
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[time-nuts] Hi all

[Jason Ball]

I should drop an email rather than just lurking on this extremely
interesting list.

I'm in the process of building my first GPSDO, so I have lots to learn
and am enjoying the education.   This list has been a real eye opener
for me.

I'm a licensed amateur radio operator looking to move up into the
microwave bands, and I spend a lot of time repairing old radio kit for
reuse by other operators.   As such an accurate time reference is
important, hence this project.

So far I've based everything on a number of published sites and
designs to learn the basics before launching into something more
adventurous and am building a simple PLL locked OCXO using a Navman
Jupiter Tu60 GPS and an IsoTemp OCXO.   Together these will exceed the
limitations of my equipment in measurement, so I'll probably have to
build a second one for comparison on the DSO or look into other
measurement methods to validate the results.

Lots to learn...



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Teach your kids Science, or somebody else will :/

ja...@ball.net
vk2...@google.com
callsign: vk2vjb
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Re: [time-nuts] Oscilloquartz 3210 Cesium Standard

[Jason Ball]

Replacing the caps could have increased voltages and exposed a fault that
caused the caps to fail...

As always step 1 - check voltages/regulators.   Remove bridging components
(diodes, power resistors) if necessary to stop the smoke and trace the
circuit as any number of components could have gone open circuit.  Double
check your soldering just in case there is an accidental bridge in there.

Good luck.

Cheers
J.


On Tue, Sep 9, 2014 at 8:47 AM, Pete Lancashire p...@petelancashire.com
wrote:

 If not check for shorted diodes.

 -pete
 On Sep 8, 2014 2:43 PM, paul swed paulsw...@gmail.com wrote:

  Adrian please copy me on the pictures also.
  Whats odd is the caps were bulging. You replaced them and now things are
  smoking. Might one have been put in backwards?
  Regards
  Paul.
  WB8TSL
 
  On Mon, Sep 8, 2014 at 4:49 PM, Adrian Constantinescu 
  adrian.valentin.constantine...@gmail.com wrote:
 
   Bert Kehren via time-nuts time-nuts@... writes:
  
   
or send it off list if you can not compress it.
Bert
   
   
  
  
  
   Thank you for your quick reply, i will take some pictures in the
 morning
   and
   post them.
  
  
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Re: [time-nuts] Poor Mans TIC (Using Beaglebone onboard PRU)

[Jason Ball]

This is interesting.   Im in the process of building my first GPSDO, it
would be interesting to use the PRU to monitor and validate that device,
obviously to the limit of the PRU's accuracy.

I have several BBB's sitting here waiting for a project.


On Sat, Sep 6, 2014 at 7:14 AM, paul swed paulsw...@gmail.com wrote:

 Ian
 Thank you


 On Fri, Sep 5, 2014 at 3:54 PM, Iain Young i...@g7iii.net wrote:

  Hey Paul,
 
  Grab the tarball, it contains each of the other files in that directory.
 
  And yes, the README tells you what you need to do. Note you will need
  the PRUSS compiler end probably the AM335x PRU Package to compile.
 
  Google for it, or grab this one via git:
 
  https://github.com/rjw245/am335x_pru_package/
 
  [Not mine, but used the inputtest example as a base]. Dump the
  files in the inputtest directory (or create a new one at the
  same level), then do the pasm and make stuff.
 
  To get started quickly, tic_ab_dualpru, tic_ab_pru0.bin, and
  tic_ab_pru1.bin, and just run tic_ab_dualpru.
 
  This will work on a BBW. I am currently playing with it on the BBB,
  and have discovered I can go to 10ns resolution, but the code needs
  adjusting (seems the PRUs might be running at a different speed to
  the BBW, I need to investigate!)
 
  I also still have the 10-11uS issue mentioned below, but I am
  unconvinced I have the pin-mux settings quite right yet (I think
  they are being passed back through the SOC-fabric, thus slowing
  things down!)
 
  I'll probably post an update over the weekend (not had chance to
  play all week due to work commitments)
 
 
  Iain
 
 
  On 05/09/14 20:09, paul swed wrote:
 
  Ian what files are needed?
  Forgive me if its in the read me.
  Thanks
 
 
  On Fri, Sep 5, 2014 at 2:56 PM, paul swed paulsw...@gmail.com wrote:
 
   Ian
  Have not downloaded the info yet.
  But I was surprised by the fact you were using LORAN sooo you must be
 in
  Europe. Lucky you to have such a fine signal.
  Great job on the tic. Now to go download the bits.
  Thanks again.
  Regards
  Paul.
 
 
  On Sun, Aug 31, 2014 at 10:26 PM, Tom Van Baak t...@leapsecond.com
  wrote:
 
   Hi Iain,
 
  Thanks very much for posting, and for sharing the code. I know many of
  us
  are interested in how well modern CPU's or SBC's can be used as time
  interval, time stamping, and frequency counting instruments. I know
 the
  BB
  PRU's have been mentioned before on the list but it's really nice to
 see
  actual code and test results.
 
  About the hp 5370 -- realize that these are still 1000x more precise
 (on
  the order of tens of ps) than what a BB/PRU is capable of (on the
 order
  of
  tens of ns). But as you observe, they key point is -- for mid- to
  long-term
  measurement of free-running time/frequency standards you do not
  necessarily
  need ps-level measurement capability. Nanosecond, or even microsecond
  time
  resolution is more than enough to create comprehensive plots of time
 and
  frequency drift over the long-term.
 
  Again, thanks.
 
  /tvb
 
  - Original Message -
  From: Iain Young i...@g7iii.net
  To: Discussion of precise time and frequency measurement 
  time-nuts@febo.com
  Sent: Sunday, August 31, 2014 1:24 PM
  Subject: [time-nuts] Poor Mans TIC (Using Beaglebone onboard PRU)
 
 
   Hi Folks,
 
  As much as we all love our HP 5370B's, they are a tad expensive if
 you
  want to monitor several PPS sources long term to ensure they are all
  closely syncronised.
 
  In my case, I have three Austron 2100 LORAN receivers and a HP Z3816A
  GPS receiver. I wanted to be able to compare each of their PPS
 outputs
  with the PPS output of the Z3816A, as well as each other.
 
  Clearly, multiple 5370's would have been too expensive, not just for
  initial outlay, but also ongoing electrical costs would not be
 helped!
 
 
  However, the Beaglebone (Both White and Black variants) have two
 PRUs.
  These are real-time units, with clocks that run at 200 MHz, and most
  instructions complete in 1 clock cycle (5ns)
 
  So, I decided to write a TIC in the PRU Assembler to scratch my
  particular itch. The current code waits for the A clock to go
  high, and then counts until B goes high, resets it's counters,
  and waits for A to go high again.
 
  It also keeps track of a sequence number for sanity's sake, and
  onward processing.
 
  Since the Beaglebone's have two PRUs, I have written the code to run
  on both at the same time, and use different GPIO pins, so you can
  compare up two sets of two clocks, or two clocks with a common
  reference. Pins are documented in README.txt
 
  Now, it's resolution is 20ns. However, it gets confused if the two
  pulses are less than around 10-11uS apart. I -think- this is when
  it sends the data back to the host processor via shared RAM.
 
  In my case, this is not an issue, as I can just slew the PPS from
  the Austron's (or even use the Fixed PPS), but if you wanted to
  compare two GPS receivers, then that would be an issue.
 
 
 

Re: [time-nuts] Ublox neo-7M GPS

[Jason Ball]

I have a dozen ublox max-7's on hand and should have suitable PCB's
for the analysis in a couple of days.  Unfortunately I don't have the
analyser, the test kit is currently limited to a HP5834A recently
calibrated to Rb and  a 100MHz DSO so probably not what your looking
for.

Let me know if I can help though.

On Wed, Aug 20, 2014 at 9:11 AM, Ed Palmer ed_pal...@sasktel.net wrote:
 Does anyone have a neo-7M and an HP 5371A or a 5372A Analyzer?  Use the
 Histogram Time Interval function to measure a block of samples. That will
 show the length of the samples with a resolution of 200 ps.  That's what I
 did a couple of years ago when I analyzed the Navsync CW-12 with the old and
 new firmware.

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ja...@ball.net
vk2...@google.com
callsign: vk2vjb
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