I should have said, I’m based in the UK, so pointers to US suppliers aren’t
much help, but thanks for taking the time to reply.
I’ve replaced the opto-coupler, it was an 817 device, got a couple off ebay
brand new for pennies, still not working though :-(
I’ve also ordered a new MOS FET which
>
> The average SMPSU usually doesn't deviate wildly from the application notes
> of the switching controller so if there's no specific schematic that might be
> a lifeline.
>
>
>
> On 18 Sep 2017 20:08, "Lists via time-nuts" <time-nuts@febo.com
&
Hello Fellow Time Nuts,
Does anyone know where I can get either a circuit diagram or a replacement PSU
for a symmetricon S200 NTP server?
I’ve fixed the original one twice before by replacing all the electrolytic
caps, this time it’s popped something more critical and refuses to come back to
Thanks to all who replied. Turns out it was the cap in the PSU (3,300uF 10v). I
replaced it with a 3,300uF 16v and all seems well.
It was a bit strange because I had already checked the PSU with a multimeter
and all rails read fine. It wasn’t until I put a ‘scope on the supply rails out
of
Hi,
I'm currently playing around with crystal oscillators (specifically a homebrew
OCXO) and came across the Wenzel low-distortion crystal oscillator:
http://www.wenzel.com/pdffiles1/pdfs/xtalosc.pdf
This uses an inductor (L1) to trim the crystal frequency, with the note that a
varactor/varicap
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Well you sent me on a search. I know virtually zip about ptp, but this page
lists a few ethernet cards that allow time stamping. Is this the same as having
a 1588 card?
https://github.com/richardcochran/linuxptp-as/blob/master/README.org
-Original Message-
From: Doug Calvert dfc-l
http://mobile.reuters.com/article/idUSBRE94T0MO20130530?irpc=932
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Flightradar24 is using beagle bones in their ADS-B/mode-s system and will be
incorporating MLAT soon. I suspect they work well in timing applications.
That said, the Allwinner they sell on Sparkfun will probably be my next SBC.
Though not listed on the wiki, they have opensuse running on it.
If you go arm cortex and linux, you will need to make your code a service.
You will want it to start up by itself and if for some reason it crashes, you
will want it to restart itself. The buzzword is harden and the techniques
vary depending on the distribution.
You should check the
My solution is not to use the R Pi. An extra $20 gets you any number of
superior arm SBCs. Go cortex-A7 type cpu.
The Beagleboard XM I'm using has a bug in the built-in usb hub (patchable), but
it has no issues with hot plugging.
The R Pi is designed to be cheap, but you spend a lot of time
I suspect the idea is to use a port where no other devices, that is internal,
are on the hub.
Like you, I never saw a usb port not on a hub.
-Original Message-
From: Jim Lux jim...@earthlink.net
Sender: time-nuts-boun...@febo.com
Date: Mon, 20 May 2013 06:14:12
To: time-nuts@febo.com
Note that MAX232 type chips add jitter. The charge pumps make substrate noise
and that leaks into the receivers/transmitters.
I like that addafruit solution.
Note the beagle XM has a bug in the USB that RCNelson fixed. I have managed to
get it in opensuse, but can't say for sure yet if it is
Bing birdseye tech uses Pictometry. They have a few papers on their position
accuracy. Perhaps conflicting papers. One shows the RMS error of 0.6ft. Another
shows a 95% confidence level at 2.8ft. This is on 4 inch resolution imagery.
In any event, if your city uses the service, you possibly
Eh, I just recalled the original question a day or so ago and was curious if
any of the imagery services had statistics on their position accuracy. It was
an interesting question.
This is the server with the marker data.
http://www.ngs.noaa.gov/cgi-bin/ds_radius.prl
--Original
Isn't the other half of the question how useful the information is to the OS?
That is how is the time integrated with the application using it. Even if the
RTCs had perfect sync, would two apps attempting to read the clock get the same
time value in a multitasking system?
I've been looking for
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
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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A bit OT, but back in the day there was what amounted to an X-prize for a real
accurate chronometer for navigation.
Make that way back in the day.
http://en.m.wikipedia.org/wiki/John_Harrison
Somehow I suspect everyone knows this story. ;-)
-Original Message-
From: Tim
In a world of digital comms with very capable competition, AOR has been looking
for a reason to exist. They have turned to high end gear. For some time now,
their radios were DDS and capable of running from an external 10MHz. I suspect
they are used in a rack of gear to direction find. The
There are limitations for low volume sellers. Ebay could easily write a program
to compute sales tax. My problem with the seller collecting tax is do they
really send it off to the tax authority.
Technically, there is no sales tax on used items, at least in most states.
Certain high value
http://www.aorusa.com/receivers/ar2300.html
Just a FYI.
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I didn't get the email, but I generally use www.ip2location.com to track
addresses. Look for demo at the top of the page.
A long story, but this is my Moroccan hacker.
41.143.64.233
A long story, but I was hacked for Morroco.
-Original Message-
From: Christopher Quarksnow
But the pan is just a ground plane. It isn't a reflector based on the type of
antennas I saw in the photograph.
Sent via BlackBerry from T-Mobile
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Wed, 17 Apr 2013 12:18:00
To:
Aren't GPS birds all over the sky. South facing is for the Clarke belt.
-Original Message-
From: Bob Camp li...@rtty.us
Sender: time-nuts-boun...@febo.com
Date: Mon, 8 Apr 2013 15:28:14
To: 'Discussion of precise time and frequency measurement'time-nuts@febo.com
Reply-To: Discussion of
This thread has already drifted a bit, but as an aside, the sky UV filters
sold for photography are a joke. (Easily verified with UV diodes and any
material that reacts to UV.) The Andover 400nm long pass actually DOES filter
UV. A 400nm is nearly cast free. A 420nm does have a bit of a cast,
You lose me at damping per decade? Is damping the right word? Do you mean high
frequency rolloff?
Most texts on photodiodes go into bootstrapping them to reduce the effect of
capacitance. But if you design fully differential amplifier circuits, they have
the same effect as bootstrapping.
I forgot to mention if you use the bootstrap technique, you can keep a negative
bias on the photodiode, which improves bandwidth by reducing capacitance. That
is, you drive the AC signal across the diode to zero, but not the DC bias. If
you use the fully differential amplifer, then the bias
The circuit is something like the instrumentation amplifier. The description
starts on page 207 with a schematic on page 208. I can scan it later, but the
circuit is easy to describe. Think of two op amps in the classic current
multiplication (I to V) circuit, that is positive input to ground
If I can rephrase that it it, the diode needs to see the difference signal of
the mixer?
-Original Message-
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Sender: time-nuts-boun...@febo.com
Date: Sun, 31 Mar 2013 11:43:48
To: Discussion of precise time and frequency
OK, so if you just need to detect the mixer difference, the band limiting of
the photodiode is a feature. ;-)
-Original Message-
From: Bruce Griffiths bruce.griffi...@xtra.co.nz
Date: Sun, 31 Mar 2013 12:28:59
To: li...@lazygranch.com; Discussion of precise time and frequency
You can simply set up a phpbb forum. Most questions cam be answered by users of
the software, who in turn can write a better FAQ because they DIDN'T write the
program. This sounds counter intuitive, but you need outsiders to do
documentation. What is obvious to the designer is not obvious to
SDR isn't as taxing as you think. I'm running 4 of those rtlsdr type dongles on
an A8-cortex. Granted under linux, but this is a single core Arm.
The multimedia versions of linux don't get much press these days since the
kernel itself now is rather low latency. But if you google linux
The timing/logging of events can benefit from precise time, even if the
processing of such data is not real time. MLAT/TDOA for example. But I believe
stock trading uses precise timing in order to queue orders.
On my list of sdr hacks is a radio interferometer. Precise event timing there
would
I think using satellite Dave's plot routines is the way to tweak NTP. If you
update too often, you can see the disturbance. This isn't a scientific
solution, but a practical one.
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Epic fail:
Not fancy SPICE simulations.
Note there are many situations where you force the result (if you call
hysteresis a biased scheme) simply because to do otherwise is a more serious
problem.
-Original Message-
From: Azelio Boriani azelio.bori...@screen.it
Sender:
There is an AMD patent where they actually drive the input pin to make it
decide rather than hang. I have no first hand knowledge with the design (well
other than knowing the designer) since I couldn't use the scheme in my own
designs.
-Original Message-
From: Bob Camp li...@rtty.us
MS has/had a program to verify if your hardware would run win7. It has been too
many years for me to recall the name. But if you are running really old
hardware, it makes sense at some point just to dump it if you run it 24 and 7,
if only for the cost of electricity (well depending where you
Just send me the link relative to archive.org of where the code should be
found.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Sun, 24 Mar 2013 11:31:50
To: step...@tompsett.net; Discussion of precise time and frequency
Uh WTF. I am preserving his legacy.
-Original Message-
From: WB6BNQ wb6...@cox.net
Date: Sun, 24 Mar 2013 16:38:06
To: li...@lazygranch.com; Discussion of precise time and frequency
measurementtime-nuts@febo.com
Subject: Re: [time-nuts] Brooks Shera
Really ?
Well
I know someone at archive.org. I can probably get the website patched if
someone can supply the missing files.
I never built Brooks most accurate clock, but of course wanted to so. When I
found some NOS symetricoms and got them going, the plug and play experience was
kind of a let down.
At what frequency do these problems appear? And how bad it bad?
-Original Message-
From: David Kirkby david.kir...@onetel.net
Sender: time-nuts-boun...@febo.com
Date: Tue, 5 Mar 2013 18:16:54
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To:
I use Ponoma cables that have the strain relief. However, I don't know about
the cable construction itself.
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My fob only outputs a code on demand, that is after I push the button.
Any of the motion detection programs that use webcams would detect the change
in display, but with a multiplexed display, I'm not sure how well.
-Original Message-
From: Jim Lux jim...@earthlink.net
Sender:
If you think about it, there would have to be some time correction if only
because these fobs can't be all that accurate in maintaining time. That is,
they would be no better than a watch.
I'm not so keen on wearing out the internal battery since these things are now
$30 instead of $5 when
I think those SBCs have insufficient RAM (128M on the biggest board.) . 512M
seems to be OK (which is where most community boards are at). The Panda ES is
double that.
Now those SBC have sata ports, so swap space isn't quite as detrimental as on
SBCs that use the SDHC for swap. Still, I
Are the two diodes really back to back? I have use two in parallel to enhance
the time the diodes will conducting. Due to current hogging, the diodes will
effectively turn on one at a time.
-Original Message-
From: EB4APL eb4...@cembreros.jazztel.es
Sender: time-nuts-boun...@febo.com
OK. I have the circuit now. Normally you would want to limit the reverse
condition to one diode drop. At two silicon diodes, the chips themselves would
start to turn on.
Odd, but I assume the designers had a reason.
-Original Message-
From: EB4APL eb4...@cembreros.jazztel.es
Ok, but open loop as I described?
I bicmos design, there are two common junk buffers. The junkiest (sp?) is
going up a PNP and down a NPN. No feedback. You live with the vbe mismatch.
Next up the food chain is the long tail pair (diff amp) with emitter follower.
With one gain stage, it is
Well the Tek current probe that goes in the power supply wasn't low cost. They
also had a nice bench supply that went in the box. But a lot of the instruments
weren't so fancy.
-Original Message-
From: Max Robinson m...@maxsmusicplace.com
Sender: time-nuts-boun...@febo.com
Date: Fri, 1
If the intent is surface mount work, get an old BL Stereozoom 3. I'd suggest
getting one with any attached illuminator, even a broken one, since the fitting
to hold the illuminator is about $30. Later model stereozooms had plastic parts
in the focus mechanism. If you need more magnification,
Eh, I'd spend the extra $200 and get a BL unless you don't expect to use it
much. At around $300, you would get a Stereozoom 3, heavy table and long arm.
The Stereozoom dates back to the days they built magnetic RAM. It is designed
for all day use. The working distance is kind of important if
If you go onto alt.sci.satellite-nav, there are many technical threads about
why averaging GPS position readings has its limitations. It isn't like
averaging an electronic measurrment where you are filtering random noise. Or
maybe it is like an electronic measurement where you have to deal with
For a single frequency use like GPS, the impedance should be close to the
target. It is true for scanners and such, 50 ohms is quite nominal. (This
notion of DC to daylight and maintaining 50 ohms is fantasy. ) But for a GPS,
you know exactly the application.
The loading could effect the
I doubt the impedance would be designed so nobody gets a right match. Anyway,
the geometric mean, which is how you would do such a compromise is 61.24 ohms.
-Original Message-
From: Jim Lux jim...@earthlink.net
Sender: time-nuts-boun...@febo.com
Date: Wed, 23 Jan 2013 20:50:00
To:
It is hard to say which Arm is best for time nuts. The Cortex-A8 is what the
Beagleboard XM uses. That CPU has neon, which is Arm's version of MMX. That
is, not fully kosher floating point, but fast parallel processing good enough
for DSP. The Raspberry Pie uses a fancier GPU and a simpler CPU
There was a thread on RF absorbing material a few months ago to get rid of
reflections.. That might be a way to spend spme money. I'd like to see before
and after results.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Mon, 21
It is possible that the noise figure of the preamp is better than that of the
gps. This is especially true if the GPS predates SiGe parts being common place.
I never ran any heliax, but isn't the idea also that it will last longer than
coax.
-Original Message-
From: Chris Albertson
If you need that mixer for a LNBF, I believe that is close to the international
C-band. Google around for a Norsat that ends in I. They use it in India.
-Original Message-
From: Lizeth Norman normanliz...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Fri, 4 Jan 2013 14:12:55
To:
Paralleling devices reduces noise. Why do you think otherwise? Noise will be
reduced by the square root of the number of devices you parallel.
-Original Message-
From: cdel...@juno.com
Sender: time-nuts-boun...@febo.com
Date: Wed, 19 Dec 2012 14:43:02
To: time-nuts@febo.com
Reply-To:
But putting the diodes in series should increase the noise. They are
noncorrelated, so I would say increase the noise in a RMS fashion.
HP has made at least one radio with switched varactors in the prefilter. They
made a SIGINT rack for I presume three letter agencies, though it was in the
I can assure you the GSM shacks have GPS timing in them. I can dig up the
photos if you want.
-Original Message-
From: Joseph Orsak jor...@nc.rr.com
Sender: time-nuts-boun...@febo.com
Date: Sat, 15 Dec 2012 18:24:20
To: Discussion of precise time and frequency
Yeah, the TruePosition website is quite interesting. It seems they do a bit
more than 911 service. ;-)
Feel free to change the #3 in the file name to whatever for more shots of the
interior.
-Original Message-
From: Dennis Ferguson dennis.c.fergu...@gmail.com
Sender:
They make frequency difference meters. I never used one, but it seems to me a
frequency difference meter would just use the two input signals to toggle up
and down respectively on a counter, then display the result over a fixed period.
Would this do what you want?
--Original Message--
They routinely redact stuff in the awards. Usually the names of the individuals
that picked the vendor. It is a silly game since you can and do FOIA much of
the redacted information if you lost the bid.
Some of the crypto comm schemes need time of day to work. Usually the pilot
will say give
It is 31 bits with no missing codes. Usually missing codes is of concern in
feedback systems, but I don't see the use in a geophone. Perhaps they will
average the digital signal further to reduce the noise, hence the noisy bits.
___
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Regarding feedback loops, I had a brain fart. I mean monotonic and no missing
codes, not no missing codes in general.
I think it was Fluke or Analog that had a small booklet on understanding data
converter specifications.
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You would probably want to see when the external oscillator frequency is close
to the internal oscillator. I suppose than could be done with a mixer and glue
circuitry. I don't think this is cheap though.
-Original Message-
From: Joseph Gray jg...@zianet.com
Sender:
I don't know if this makes things easier or not, but the act of sampling itself
is like a mixer. If you sample one clock with the other, it would produce a
beat frequency. Sampling here just means a strobing a D flip flop. The output
will be low frequency, so the error could be measured with a
Relative to the last notice, a CW jammer would be at a single frequency, so it
seems odd they specify a band. Perhaps a CW anywhere in that band.
I talked to the USAF about their jamming, and they use white noise over the
band. A certain COTS Marconi (IIRC) signal generator produces the band
Or you just hack the SCADA. Far nastier.
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I have one of those key fobs. Does the code somehow inform the power the be
about the drift in the built in clock? Or is the time element of the code so
sloppy that the drift is acceptable?
-Original Message-
From: Jim Lux jim...@earthlink.net
Sender: time-nuts-boun...@febo.com
Date:
If you were going to add a pipe for coax purpose, wouldn't you want something
like the electrical service inlet? They have a bit of a hook on the top to
reduce water penetration.
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I'm just amazed Aligent doesn't take credit cards directly. Paypal is for small
time players.
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Based on a sample of one (my NTP), I can hold the clock frequency to 0.1PPM.
Seems to me you could compute the adjustment requirements from such a number.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Wed, 7 Nov 2012
Microsoft also does updates regarding the day daylight savings time changes,
similar to that Apple message.
I suspect I'm not following this thread correctly. What I got from the orignal
thread is Microsoft will thunk the RTC during the switchover. I'm going to
make it a point to insure NTP is
It has been my experience with nicad and NiMH, the higher the cell capacity,
the shorter the battery life. Not for cycles, but in terms of years.
I designed a charger chip for bridging applications. Bridging batteries are
used to maintain a system while you swap battery packs. The batteries
The GPS seeing the horizon isn't required. Those satellites are filtered out by
software. The timing GPSs are designed to be less sensitive to the horizon.
-Original Message-
From: Chris Albertson albertson.ch...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Thu, 25 Oct 2012
The 20 degree cutoff is what I recall the starloc uses as a default. Now I
don't know how important it is to filter those out by the response pattern of
the antenna versus by software.
-Original Message-
From: Rob Kimberley robkimber...@btinternet.com
Sender:
Just a FYI here, using Dave's logging program, I found large errors in NTP when
the antivirus did its thing. I don't know if it was due to CPU activity
interfering with NTP or the cabinet heating up when the antivirus was running.
-Original Message-
From: David J Taylor
A bit OT, no way OT, but I found Bev as useful as tits on a boar hog.
Planeplotter was trying doing illegal memory acesses and Bev wouldn't provide a
copy of the program with debugging enabled.
Worse yet, after paying for the program, my credit card got hacked all over
France.
Planeplotter
Looks good, but I would have gone for a different GPS antenna. The timing
antennas are weather proof. I have a Marine grade GPS antenna, also weather
proof, but the timing antennas are probably a little better since they have
less response to GPS birds on the horizon.
-Original
If they have FCC ID numbers, you may be able to find photographs of the inside
of the devices, which in turn could reveal the chipset if the photo was clear,
then with the chipset you could determine if a 1 second pulse is available.
Years ago I got a GPS board from Asin or something like that.
You really want to drive the LEDs with switcher designs typical in battery
chargers, basically hysteretic current output. Prior to LIon batteries (which
are voltage sensitive), the old nicad/NiMH chargers used the hysteretic scheme.
If you want a simpler switcher, you can take the garden
If you take your garden variety boost converter and place a resistor as the
load, the current in the inductor is regulated. (Current is vreference over
this resistor value.) All these dedicated LED drive chips do is reduce the
voltage across the resistor to improve efficiency. In addition, they
The PWM DAC should have perfect differential linearity, which I believe is all
that matters in this application. (That and no missing codes.) Not so when you
try to combine two DACs to make one higher resolution DAC.
-Original Message-
From: Tom Harris celephi...@gmail.com
Sender:
Fedex ground is awful. Fedex air is fine.
I go out of my way not to use Fedex ground. Fedex ground is mostly remnants of
RPS. Air and ground operate like two different companies, at least in attitude.
I have no idea if there is a firewall between them.
-Original Message-
From:
Ebay fees don't reflect shipping cost, so the seller makes more money by
inflating the shipping price, even if it reduces the final sales price.
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Items can swim through peanuts. You can put the peanuts in bags so the items
in the box don't reach the outside.
-Original Message-
From: Tom Miller tmil...@skylinenet.net
Sender: time-nuts-boun...@febo.com
Date: Mon, 10 Sep 2012 19:18:15
To: Discussion of precise time and frequency
I have a Junghans. I can't say it is easy on the batteries. Otherwise they
work. I regret not getting the glows in the dark version.
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What am I missing here? Vce = Vbe, so the diode connected transistor isn't
saturated.
-Original Message-
From: Bob Camp li...@rtty.us
Sender: time-nuts-boun...@febo.com
Date: Sun, 9 Sep 2012 19:16:22
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To:
I think 50% is the employee discount, at least back in the day.
I worked at a company that was one of the early users of Silvaco. The founder,
Ivan Pesic, bought all the gear for his start up at employee discount, then
started a company competing with HP TECAP. He got the network analyzer, the
I think monitoring a signal generator was the best idea presented. You always
need a baseline (sanity) test in any experiment.
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Some of those Microsoft hockey pucks used SIRF III chipset. I would check ebay
for that kind of USB GPS. Streets and Trips, well specifically using a notebook
for a display, has long been out of favor.
So I'm assuming here ST didn't use NEMA interface format.
-Original Message-
From:
These mapping programs tend to fall back to NEMA, but also have proprietary
formats. (Certainly true of Garmin and Delorme.) Now I wonder if by specifying
a ST USB GPS they want whatever proprietary format MS used. That is, it would
have made more sense that if they wanted NEMA, they would
Power factor.
-Original Message-
From: Tom Knox act...@hotmail.com
Sender: time-nuts-boun...@febo.com
Date: Sun, 19 Aug 2012 13:19:20
To: Time-Nutstime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] Modern
If you live near a Fry's, get a basic Kill-A-Watt. About $20. Often less on
sale. You don't need the fancy version that computes cost versus time of day,
etc.
-Original Message-
From: Ed Palmer ed_pal...@sasktel.net
Sender: time-nuts-boun...@febo.com
Date: Sun, 19 Aug 2012 12:35:51
To:
If you are using a desktop, I'd suggest putting in a serial card. The Netmos
chip based cards work on windows and linux, though your should do an internet
search on the particular card before you buy.
I have the prolific based converter. It didn't work with my Starloc. (The
netmos worked fine
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