ion 4 and I'm surprised at the size of correction every
> >> couple minutes to my PC clock. I'd be happy if my PC clock were
> accurate
> >> to plus/minus 100ms.
> >> Ron
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You guys, well some of you are mixing to things
1) the building code requirement to ground an antenna is for the protection
of the building. The building code don't care if you electronics is fried
or not. The wire and ground rod keep the antenna mast at earth potential.
2) Those surge protec
d the same rate.
> >> If you have multiple, non bonded grounds, there is a different reference
> >> for each ground. This is a major source for disaster.
> >>
> >> I spent seven years in lightning mitigation. I was told by professionals
> >> that I w
d fuse the various grounds to it. But the cost
of having the trench dug (before even buying the wire) exceeds the cost of
the equipment it would protect. TV sets are only $300 today.So most of
us about $10 worth of protection (a coax ground block and #12 bare wire)
and buy insurance.
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rrow that will fit in a one square inch board.
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is not the way to go if you want to build 1,000
units but for a few tens of units it saves quite a to of work.
Especially if a software update has to be done after shipping. The
board's USB connection saves end users much hassle.
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this list with great interest. It feels
> good to know that I am not the only nut
>
> BR/
> Joakim
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as, Dedicated GPS
receivers for car navigation, and 100 other things
Heat does have one product that will do well. A mod board for an
older heath signal generator. It's about $30 and an easy retrofit.
Digital clocks are just not the amazing technical wonders they once
were.
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service (3 bare boards, 2 sided with
> solder mask and silk screen) for prototypes and then buy the Gerbers
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he instructions there.
>>>
>>>
>>>
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PWB.
>>> Since it is a hobby that has become a business, time matters to me,
design
>>> time and delivery.
>>>
>>> At that point, the cost of the Gerber becomes somewhat irrelevant.
>>>
>>> Note that you can make boards of any size in ExpressP
that form the 3D norm? Is your color green the
> same as mine?
>
> Soldering SMD parts, I use my OptiVISOR x10,
> a bit close but I can hold my breath.
>
> Ian, G4ICV,AB2GR
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> 408A-BD16-6F50468C74C2
>
>
>
> I'm hoping someone here could help me out with this as I'm well in over my
> head by now.
>
>
>
>
>
>
>
> Cheers,
>
> S
>
> _
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NTP over a
dial-up phone modem in the days before always-on Internet This was in the
1980's and it worked well enough. The normal case was "outage" as the
modem connection was short and only a few times per day. But was good
enough to re-calibrate a local clock
Chris Albertson
ftware, why not discipline the mother board's XO? Yes
but it is a large amount of work to modify an existing product.
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ustry". I've
>> not seen it move to things like technical comments about products, but it
>> could well happen.
>>
>> Dave
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uts@febo.com
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wrong edge. Yes it makes such a
mistake hard to find but, I think that was the point.
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han Intel architectures? Does it compile on
ARM?.
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) running Linux and NTP
with a GPS input are easy to get an order of magnitude better than your
requirement.
So are you stuck with windows. f so it can work with some rather complex
setup. If you can select another OS then you get out of the box
sub-millisecond performance with little effo
on goes
> directly into a hardware serial port. Here's a pictures of my connector:
> <http://imgur.com/a/PEiBU>
>
> There's lots of other great GPS receivers with PPS output, including old
> timing receivers like the Motorola Oncore, Trimble Resolution T, etc.
> Thos
> -- Miss Matheson, The Diamond Age, Neil Stephenson
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s a continent or will see more of this then going to a
nearby server
> Bob
>
> > On Oct 4, 2016, at 9:05 PM, Chris Albertson
> wrote:
> >
> > The problem, I think with your Internet sync's NTP servers is you are
> only
> > using one server S. The most co
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where a GPS receiver is the only reference.
> That document had only that short note, no details on why or specifics of
> behavior.
>
> --
> Chris Caudle
>
>
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sync is for a little bit tougher case than a local
>>> area
>>> network.
>>>
>>> --- Graham
>>>
>>
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&
, 2016 at 5:14 AM, Magnus Danielson wrote:
>
>
> On 10/05/2016 01:48 PM, Attila Kinali wrote:
>
>> On Tue, 4 Oct 2016 18:05:16 -0700
>> Chris Albertson wrote:
>>
>> The problem, I think with your Internet sync's NTP servers is you are only
>>> usin
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he results be limited if I
can only sample at 2.3 MSPS?
Obviously I'n not directly sampling there 10MHz signal. I'm sampling
there frequency difference that a mixer gives me.
On Sun, Oct 9, 2016 at 4:16 PM, Bob Camp wrote:
> Hi
>
>
>> On Oct 9, 2016, at 6:18 PM, Chris
post my ntp output and ask for an opinion, then this
> discussion popped up. It would appear that asymmetric delays are the
> exact explanation for what I am seeing.
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he
manufacturers are by definition of "counterfeit" being dishonest slim
balls. Why would he care about anything other then that he can fool
some people into buying his product. There are third party chargers
that are not trying to copy a well known brand, these are usually much
wer supply.
But what is that? I bet if varies a lot.
And like I wrote before it may not even matter as phones don't
directly use the 5 volt DC that these chargers produce.
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he 10 ms offset *is* suspiciously close to what you would get with a 10
> ms pulse stretcher
> *and* a setup that is triggering on the wrong edge.
>
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bit micro processor and an
> > external 32.768 crystal. Obviously the external crystal is
> > awful for accuracy.
> >
> >
> >
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from the GPS, and automatically set the
> clock to the correct time after a power failure - something the original
> clock could not do. As a double bonus, make the clock display leap seconds
> correctly when they happen.
>
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> >
> > I wanted to get the opinion of anyone who has tried the Leo Bodnar GPSDO
> ?
> > For the money it appears to offer a beginner a lot of features.
> >
> > Thanks and reading the daily digest of what you guys are working on.
> > I have a feeling if I am n
hat’s all a sub $1 solution….
> >
> >Bob
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L NTP server?
Time will be within a couple tens of milliseconds they will be in sync well
enough that the eye can not notice.But this means setting up a local
NTP server. Any spare computer can do this you can connect a GPS if you
like but will not help much in this use case
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er expect worse performance.For best performance copy and paste
the Linux PPS code and then re-build the Linux kernel with your new driver.
Getting event time stamps much better then this requires some purpose built
hardware outside of the computer.
Chris Albertson
Redondo Beach, C
Ave., Suite E, Bend, OR 97703
> g...@rellim.com Tel:+1 541 382 8588
>
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> Any simple idea will be worded in the most complicated way.
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rmonics and needs to be
filtered.
> Giuseppe Marullo
> IW2JWW - JN45RQ
>
>
>
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u have to remember what this thing replaces. In ham radio, some people
are using vacuum tube oscillators with mechanical variable capacitor
tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to
allow more exact tuning This Si chip is considerably better then 1940's
techno
> and follow the instructions there.
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| TCP/IP since RFC 956
> > FreeBSD committer | BSD since 4.3-tahoe
> > Never attribute to malice what can adequately be explained by
> incompetence.
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Radio.
>
> Attila Kinali
> --
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ght I would ask before
> diving in to that asp pit.
>
> Bob
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es
> without relay on WWVB signal propagation. Sometimes its a challenge to get
> WWVB in big cities because of location and QRM.
>
> --
> WBW,
>
> V.P.
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fident
> that I have not slipped one cycle.
>
> Can I do what I am trying to do or am I missing something?
>
> Pete.
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yed somewhat. It is not even clear if the length of the delay is
constant.
If using the PPS for timing and the PPS is inverted you will have to
measure the delay length an account for in the config file.
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_
ou should reset the pin,
> which adds some ambiguity to the set/reset times.
> Granted, I'm doing this on a general purpose PIC, but I have read comments
> about various receivers having some jitter on the reset side of their 1PPS
> pulse.
> Bob
>
> ___
c0e04d8c95779afaa0cad9ed%7C1&sdata=0Xaed5Ff0AHg42sDZd%
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't available today. I haven't looked for eBay
> style
> low cost boards.
>
>
>
> --
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>
>
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her connectors and passives.
You can assign most functions to most pins and the CPU is roughly an order
of magnitude better then Arduino With Arduino it is easy to run out of
(say) analog inputs or especially external interrupts but with this ARM you
don't run out of anything until basicall
it from their environment and
> start your code with a disable interrupts.
>
>
> --
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>
>
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S/N slots for each visible/working satellite?
>
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>
>
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; slower turning/quieter fan.
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Re
/like as roof
> mounted antennas? Are some of the 'Marine' antennas better?
>
> Russ
> K0WFS
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> >
> > PS: the other clock (qrp-labs) is way behind schedule, but hopefully
> will arrive soon
> >
> >
> > `
> >
> >
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> Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
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a micro board than a Rasp Pi with its
> USB controlled Ethernet, or the BBB with it's RF issues?
> *What am I not considering that could end up biting me?
>
> Thanks,
>
> Michael
>
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al-time as well is some multitasking and even
network.
If you really need Linux and it needs to be small and low cost and low
power, then look at the "Pi Zero". It is a very small Pi that sells for
only $5. It has video but just don't plug in the
rded in the most complicated way.
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N3QE
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r some other data
link back to the office. NTP can work just fine using IP over serial link.
even at low baud rates.
>
> On 01/12/2016 1:51 AM, Chris Albertson wrote:
>
>> First question: How accurate does your local NTP server need to be? If
>> the answer is "a
tape recorders. Use it the same way on digital
> multitrack recordings. Google IRIG Time Code.
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you get explicit description of the audio
> > sample location referenced to the PTP epoch.
> >
> > --
> > Chris Caudle
> >
> >
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WAAS is about 1.5 meters I bet a 12 hour self survey is
about 0.5 meters
Are we still talking about NTP? If so this kind of stuff is lost in the
noise and will never show up on your system clock.
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time-
lot cooler than a 7805, though!
>
> John
>
>
>
>
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Lowest price I've found is BasicPCB.com They charge $3 per square
inch for 2 layers with mask and legend. Minimum is three boards of 1
square inch. So you actually can place a $9 order with them. They
are a USA based company.
They accept standard Gerber files. This is very impotent as a few
Lowest price I've found is BasicPCB.com They charge $3 per square
inch for 2 layers with mask and legend. Minimum is three boards of 1
square inch. So you actually can place a $9 order with them. They
are a USA based company.
They accept standard Gerber files. This is very imported as a few
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right, TI offer samples.
On Sun, Jun 2, 2013 at 11:59 AM, Chris Albertson
wrote:
>
> Recent talk about NTP servers. It seems the limit to their accuracy is
> the quality of the crystal that drives the CPU clock. Most of them make
> really good thermometers. I'd like to try and
fo/time-nuts
> > and follow the instructions there.
> >
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a sense you could say that Paul's circuit does get the WWVB signal to
> the receiver - it's just a new phase stable version of the signal signal.
> This way I don't have to mess with the insides of the 8170.
>
> Burt, K6OQK
>
> From: Chris Albertson
>>
>
llator to
> the WWVB carrier, but presumably the PSK would work against you here.
>
> Best regards,
>
> Charles
>
>
>
>
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ers right.
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Chris Albertson
Redondo Beach, California
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VG - www.avg.com
> Version: 2012.0.2242 / Virus Database: 3199/5932 - Release Date: 06/22/13
>
>
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For most school age kids,
> the sources of time available are fairly lengthy (e.g. 1 second ticks from
> wwv by phone, stopwatches built into iphones, etc.)
>
> Tape measures and meter sticks are readily available.
>
>
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On Mon, Jun 24, 2013 at 1:55 PM, Jim Lux wrote:
> On 6/24/13 10:08 AM, Chris Albertson wrote:
>
>>
>> Isn't that the Fizeau technique, which antedates Michelson's?
>
Michelson got the precision good enough that it finally put the question
to rest. We used a mi
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Chris Albertson
Redondo Beach, California
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f they were in school befoe 1959 and did not keep up with this.
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Chris Albertson
Redondo Beach, California
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seller in China or Hong Kong or someplace, points East.
>
> Bob - AE6RV
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