Bob Camp wrote:
Hi
I realize that this is a bit off topic from the flow of the last few days. I
can only claim temporary insanity. Any comments about the temporary modifier in
that sentence being unneeded will of course be ignored...
Assuming that:
1) I have a DMTD setup of the "basement eng
Bill Hawkins wrote:
My first job was in a blasting cap plant in 1960. There were
military devices so sensitive they could be set off by turning
on a nearby fluorescent desk lamp.
I learned that the human body has a capacitance of 400 pico F.
Getting up from a chair could raise a couple of kilovo
Lux, Jim (337C) wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bill Hawkins
I learned that the human body has a capacitance of 400 pico F.
Getting up from a chair could raise a couple of kilovolts. We
walked on conductive r
Ed Palmer wrote:
Everything old is new again.
The 25+ year old HP Bench Brief that I referred to a few messages back
warns about that.
"Nothing usefull could be found in old documents, they just didn't have
the same technology as we have, and hence not the problems." Well, not
that much dif
John Miles wrote:
So why even talk about TC phase shifts at the ps / deg level? Who
cares and who needs it?
A picosecond is 1000 femtoseconds. When you're spending $100/ea. on parts
rated for 60-70 fs jitter, a picosecond starts to look like a long time
indeed.
Does not sound like you are
saidj...@aol.com wrote:
I recommend un-screwing that SMC since it is almost impossible to find the
mate, and feeding two wires from a 5V supply into the unit through the
hole, and soldering the wires to the PCB. Works well for me.
It is not impossible. I have a cable suitable for it, but we
saidj...@aol.com wrote:
Hi Brian,
This is a classical crystal jump.
Nothing one can do about it.
Could have been internal to the crystal (stress-relief) or external (gamma
particle hitting the crystal lattice etc).
My 58503A does it every couple of days or so. Really messes with your AD
Hal Murray wrote:
Interesting timing...
http://xkcd.com/695/
If you aren't familiar with xkcd, some may be NSFW. (and/or it may be a time
sink)
I think this one is safe/great.
Mmm... XKCD is usually brilliant. I think he draw a Mars rover but had a
dash of Marvin tossed into the silicon
Poul-Henning Kamp wrote:
In message <6755cb2a-9566-4f35-818e-38471be65...@cq.nu>, Bob Camp writes:
And now "they" are trying to do away with edison bulbs. I hope
the LED equivalents are better, because the CF bulbs seem to last
less in most home apps.
Speaking of LED lamps: I want to point ou
J. Forster wrote:
Attached is a spectrum of a "white" LED Flashlight. My diode spectrometer
does not go further than the limits shown.
Looks pretty continuous to me. Great. I know there is non-continuous
LEDs out there, but I hope they will fade to grey while continuous takes
the market.
Ch
J. Forster wrote:
The attached spectrum is from a Circline Fluourescent that screws into a
table lamp.
This is the type of spectrum I would like to avoid.
Continuous spectrum and warm white is my preference for normal light.
Fluorescent "sky blue white" is what I don't want.
Cheers,
Magnus
_
Don Latham wrote:
also matches the sun within reason...
Indeed.
Cheers,
Magnus
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d.sei...@comcast.net wrote:
I took apart the last dead one just for that purpose. I initially eyed the 105deg Al cap, but it was dead, along with one of the xstrs (hole in package). The film caps, diodes and fuse are still good too. As is the tube- don't know what I'll do with that.
Sounds to m
Robert Atkinson wrote:
Hi,I'm late to the thread (as usual), but have looked at these LED's in the past. It was for a biotech imaging application. There are two types, a red/green/blue cluster or a blue / near UV LED with a white phosphor. These phosphors seem to have a fairly continuous spectrum,
Mark Sims wrote:
Sulphur flower is ground sulphur raw sulphur. Flowers of sulphur is precipitated out of sulphuric acid.
The distinction is subtle, but can be quite deadly if you do pyrotechnics.
Flowers of sulphur can be highly acidic and reacts violently with chlorate
compounds.
Hmm.
Steve Rooke wrote:
Not wishing to push this O/T thread more O/T but coming from England,
and now in New Zealand, we have these sodium streetlights which I
think are a pain in the neck. They have only two narrow spectra of
yellow light and although they produce light it makes it hard, if not
impos
Fellow time-nuts,
I keep poking around various processing algorithms trying to figure out
what they do and perform. One aspect which may be interesting to know
about is the use of zero dead time phase or frequency data and the
frequency estimation from that data. One may be compelled to
diffe
Tom,
Tom Van Baak wrote:
Magnus,
Correct, all the terms cancel between the end points. Note
that this is exactly equivalent to the way a traditional gated
frequency counter works -- you open the gate, wait some
sample period (maybe 1, 10, or 100 seconds) and then
close the gate. In this scenari
Pete Rawson wrote:
Gentlemen,
You've hit a topic I've become more confused about after
researching some of the original papers on this subject.
Here are a few questions which I would like to become
educated about.
1) Will the calculated results of ADEV, ODEV, MDEV & TOTDEV
suggest which
Bruce,
Bruce Griffiths wrote:
There are some excellent papers on the subject; start with
the one by Rubiola:
<
http://www.femto-st.fr/~rubiola/pdf-articles/journal/2005rsi-hi-res-freq-counters.pdf
>
There are additional papers (perhaps Bruce can locate them).
In particular, there is one p
paul swed wrote:
Unfortunately can't download these
You need the IEEE UFFC account. Now you know why I have mine. Those two
articles is fairly short, so getting an UFFC account for those alone is
kind of meaningless.
Cheers,
Magnus
___
time-nuts
Bob Camp wrote:
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good 10 Hz sine wave. A normal audio generator will not produce a 10 Hz output with good enough short term stability / noise to give you useful data. Audio generators may
Bruce Griffiths wrote:
Bob Camp wrote:
Hi
At least from the last time I tried it:
If you use a sine wave input source, it's got to be an amazingly good
10 Hz sine wave. A normal audio generator will not produce a 10 Hz
output with good enough short term stability / noise to give you
useful
Bob Camp wrote:
Hi
The DAC will quite nicely produce a trapezoid (or clipped triangle wave). It's certainly on the list.
---
I've had a lot of lunch time discussions with the NIST guys about their "obsession" with input levels. About all I can say is that I don't see the same sensitivities t
Bruce Griffiths wrote:
Magnus Danielson wrote:
When both the RF and LO ports are saturated, the mixer output
waveform depends on how the IF port is terminated.
The output is indeed approximately triangular with your IF port
termination method when both the RF and LO ports are saturated.
My
Bruce Griffiths wrote:
Joseph M Gwinn wrote:
The integration function requires a low frequency cutoff (either a
servoloop or a resistor shunting the integration capacitor) to avoid
integrator saturation.
This inevitably distorts the triangle wave, however it should be
possible to reduce the tria
Gerhard Hoffmann wrote:
paul swed wrote:
Well not having a lot of luck with the xilinx wise application.
Its a 6.5 GB tar and after a good 5 hr plus download the tar doesn't open
with zipgenious
But 6.5 GB to work a cpld. Seems crazy to me.
I also had no luck two weeks ago with the single fi
Bruce Griffiths wrote:
_Correction_
Oops, Its the CNT91 not the CNT81 that actually does the regression fit.
How did you achieve MDEV ~1E-13 @10s with a counter rated at 50ps single
shot resolution?
I think the actual resolution and trigger jitter was combined to a
single number. For some r
Pete Rawson wrote:
Efforts are underway to develop a low cost DMTD apparatus with
demonstrated stability measurements of 1E-13 in 1s. It seems that
existing TI counters can reach this goal in 10s. (using MDEV estimate
or 100+s. using ADEV estimate). The question is; does the MDEV tool
provide an
Bob Camp wrote:
Hi
The counter is not the big issue in DMTD. We seem The problems lies elsewhere.
I think we've gone into that pretty deeply in various recent threads.
Indeed, as long as one slew-rate amplify the beat signal such that the
slew-rate into the counter does not become the main
Chris Caudle wrote:
No discussion on the new Al based atomic clock paper from NIST?
http://arxiv.org/PS_cache/arxiv/pdf/0911/0911.4527v2.pdf
"Here we describe an Al+ ion clock with an inaccuracy of 8.6×10−18."
Doesn't get more nutty than that.
Not matching any of my counters all that well..
Bruce Griffiths wrote:
If one has a high end sound card then it could be used to implement the
bandpass filter and replace the zero crossing detector.
It may be necessary to insert a pilot tone to calibrate the sound card
sampling clock frequency.
A noise floor of about 1E-13/Tau should be achi
Bob Camp wrote:
Hi
I believe the statement:
"Both systems are equally limited by the reference oscillator"
was part of the same paragraph as the comment on 10811 short term stability.
Neither system, no matter how well set up will get below the stability of the
reference oscillator.
For
Bob Camp wrote:
Hi
My main concern with the low frequency pole in the sound card is the quality of the R/C
used. You can certainly model what ever you have. If they used an aluminum electrolytic
for the "C" it may not be the same next time you check it
Do consider to bypass it. This is
Raj wrote:
While comparing a Rb FE5680 frequency reference with another RB or GPSDO I find
that tapping a Rb unit causes a sudden shift in the scope display meaning the
frequency has slightly shifted momentarily and locks back steadily with a phase
shift. This does not happen in another Rb FE5
Raj,
Raj wrote:
Hi Stan,
I will explore this issue tomorrow, 20:00 here now. I was just going
through a boyish thrill of fiddling with a Sony ICF-S10Mk2 and the amazing
numbers of AM stations it picks up.. maybe it can be used at 60Khz.. for 10$ it
worth it !!
How about keep
Dear Mark,
Mark Sims wrote:
A while back there was a discussion on just how Trimble's AMU (amplitude
measurement units) signal levels related to the dBc values. Here is a
conversion table.
It was generated by doing a 24 hour antenna signal level survey in dBc and another one in AMUs and the
Mark Sims wrote:
The data was collected in 0.1 dB / AMU steps. There was a lot of noise in the raw data (maybe +/- 1 dB or AMU), but the general trend of the curve was quite distinct. I smoothed it out by hand and filled in a few (maybe 15) of the missing steps that had no signal.
The 0.1
Arnold,
Arnold Tibus wrote:
Magnus & Mark,
for my Thunderbolt system I found a very good correlation
between AMU and dBc/ Hz ( observed on my system using
the ThunderboltMonitor watching over long time stable satellite signals )
when I use the Formula: C/N0(dBHz) = 20 log(AMU) + 23.5.
It w
Stan, W1LE wrote:
Hello The Net:
About a year ago I asked CTS Knights that very question.
They said it was a custom unit and they would NOT divulge the specs.
They referred me to SRS, their customer.
So I talked with SRS and they would only sell me a complete FS700
rebuild service
for more mo
Henry Hallam wrote:
Timing newbie here, so please educate me - why does aging matter?
Isn't the whole purpose of a GPSDO to completely eliminate long-term
drift?
First degree effect yes, but depending on how you do it, more or less of
the drift remains uncompensated. If you just try to do freq
Lux, Jim (337C) wrote:
(If you've ever seen the Villa d'Este in Tivoli, near Rome, you'd be amazed at
what can be done with air and water pressure, ALL gravity fed)
http://en.wikipedia.org/wiki/Villa_d%27Este (which is actually a pretty lame
description) google for "villa d'este organ fountai
Bob Camp wrote:
Hi
DMTD looks at a pair of sources (crystal, rubidium, maser .) and tells you
the difference between them. If you looked at more than two, you can better
characterize the individual sources.
Any good papers out there on taking the DMTD approach and extending it to
simul
Bruce Griffiths wrote:
Lux, Jim (337C) wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]
On Behalf Of Bruce Griffiths
Sent: Wednesday, February 17, 2010 2:10 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-n
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths wrote:
Lux, Jim (337C) wrote:
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths
Sent: Wednesday, February 17, 2010 2:10 PM
To: Discussion of precise time
Bruce Griffiths wrote:
System constraints arent necessarily due to cost constraints.
The constraints may be imposed by experience limitations and the
learning curve associated with FPGAs etc.
The level of design ability needed is still moderate, and for a skilled
designer, the effort to produ
WarrenS wrote:
T&F Nut question
Is the high frequency phase noise of a buffer important when the
Oscillator is used just as the Reference for taking ADEV data?
The current (2005) writings say that ADEV phase data should be bandpass
filtered which removes all the High freq edge jitter.
If that
Lux, Jim (337C) wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bob Camp
Sent: Wednesday, February 17, 2010 4:24 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] DMTD to MMTD
Hi
No Windows 7
Hal Murray wrote:
The trick of including a PLL in an oscillator package has been around for a
while.
The initial ones were programmed at the factory or distributor. The idea was
to avoid the long wait while they polished the crystal to your specific
frequency. They stocked them in a handful
Richard (Rick) Karlquist wrote:
David C. Partridge wrote:
Cough - the rubidium clock or oscillator does have an intrinsic
frequency,
which is the rubidium hyperfine transition of 6 834 682 610.904 324
Hz, it's
just that the frequency generated by the transition in question isn't
used
to DEF
Rick Karlquist wrote:
ewkeh...@aol.com wrote:
The HP 5062C is not a "Primary Standard", and that is why it is called a
"Reference" because it uses a different transition of Cesium 133 with the
frequency of 9192.631,774,3 MHz which does not meet the definition of a
second
and resulted in a relat
Rick Karlquist wrote:
If you want to get technical, the frequency of a cesium standard
also depends on the gravitational acceleration, but for relativistic
reasons, not newtonian physics. Any decent cesium is accurate
enough that it will noticably speed up at NIST in Boulder. NIST's
best clocks
Poul-Henning Kamp wrote:
In message <20100223214204.eae71117...@hamburg.alientech.net>, Mike S writes:
renamed, since the discussion has shifted.
"In the time and frequency field, the term primary standard is
sometimes used to refer to any cesium oscillator, [...]
That rhymes with and Karls
Bruce Griffiths wrote:
Garry Thorp wrote:
With the 723, you can make the reference noise as low as you want, by
heavy RC filtering. This applies whether you use its own reference or a
better external reference.
The 723 also seems to work quite happily with a feedback capacitor from
the output to
Gerard,
Gerard PG5G wrote:
Hello all,
First post here, so I'll start with a quick introduction. I trained as
an electronic engineer but don't work in that field any more, which has
given me the appetite back to do some electronic engineering as a
hobby. I have been a licensed ham
Bob Camp wrote:
Hi
The winds in Sweden change directions in a *very* predictable fashion?
Ghaa! Our secret is out! :)
No, by rock I mean crystal, gas is Rb and Cs but could also be H but I
don't have one of those babies, and by air I mean GPS or other radio-signal.
Cheers,
Magnus
most of what others have asked
me as well.
Regards
Gerard
Magnus Danielson wrote:
Would you consider to disclose your architecture somewhat more?
In broad terms:
Input conditioning with ADCMP600 comparators followed by FF divide by 2
to get a 50% duty cycle signal on both the ref and
Jim Palfreyman wrote:
Anyone here have any experience with these masers?
In particular the VCH-1005A?
I have been tasked to look after a number of these units and am currently
going through the manuals (which are in English but written by a Russian, so
they can be challenging :-)
Any thoughts,
Bob Camp wrote:
Hi
I hear that the US ones look better than the Russian ones when you have them
spinning around on a frozen pond. Nether one does a very good triple axle
jump though. At least that's what I read on the internet
---
There's always been a *lot* of debate about exa
Gerard,
Gerard PG5G wrote:
I have had a few replies, both on list and off list, including some
offers for help and some suggestions regarding the capabilities of my
counter. Thanks to everyone who took the time to write.
I understand from various replies I had that I cannot measure ADEV the
Bob Camp wrote:
Hi
So a parts donor 5370B is a donor for 5370B's and not so much for a 5370A.
It should be decided on a board-for-board level. Several boards are just
the same, so it would be no problem.
Cheers,
Magnus
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time-nuts mailing list
Bob Camp wrote:
Hi
I'm about 90% sure I'm going to hang on to the counter. It may wind up with
a bunch of fixed level inputs on it, but for the price - I'll live with
that. Other than the blow to the front panel it seems to be in ok shape.
If I do keep it, tearing it open and checking all the i
Yuri Ostry wrote:
Hello,
J> Anyone here have any experience with these masers?
J> In particular the VCH-1005A?
J> I have been tasked to look after a number of these units and am currently
J> going through the manuals (which are in English but written by a Russian, so
J> they can be challenging
Mark Sims wrote:
99.95 ns is a typical number for the period reading at minimum gate time. Set
the gate time to 1 sec. My 5370A shows 99.999 999 9650 +/- 50 at 1 sec gate
time.
Measuring it's own time-base is expected to give value not exactly
on-beat. Internal cross-talk with the interna
Mike S wrote:
At 12:44 AM 3/10/2010, Ed Palmer wrote...
It would seem to make more sense to have the fan blowing hot air out
the back and drawing the hot inside air over the temperature sensor.
The reason to have a fan blow in is so you can put a filter on it. It
also creates more turbulence
Ed Palmer wrote:
Good point about the filter, but it doesn't appear that the 5371a or
5372a ever had a filter. Unless it was just done out of habit because
other HP units did have a filter.
If you want to toss a filter on it because your environment isn't
exactly clean, it is trivial. Maybe
Bob Camp wrote:
Hi
Yes indeed, the period was measured with the two channels in the com mode and
the reference
into one of them. I hadn't considered the trigger offset issues and was
expecting something
sub-100 ps rather than 500 ps. Obviously I need to spend some "quality time"
with this bea
Ed Palmer wrote:
One trick I always use to quiet down a rowdy fan is to replace the
mounting screws with rubber mounts. This isolates the fan's mechanical
vibrations from the chassis. The difference is audible - even with a
good fan. I salvaged some mounts from IBM machines that work great.
Bob Camp wrote:
Hi
Fanless Atom motherboard / solid state disk / wall wart power supply ... DVD
is still the main source of noise.
This was far from that. It is a AMD PHENOM II X4 90SE 2,5GHz CPU with 8
SAMSUNG ECOGREEN F2 1,5TB SATA disks is certainly not tailored in such a
fashion. The Fr
Hal Murray wrote:
Concerning my query about what's good enough to count as a contact...
We've done Moonbounce with 3mW (Hobart - Dwingeloo) in JT65 - but a
26m and a 25m dish is stretching 'amateur' a bit again.
Googling for JT65 finds a nice paper:
http://www.arrl.org/FandES/field/regulat
Hal Murray wrote:
mag...@rubidium.dyndns.org said:
Their modulation scheme is 1 of 65 tones. 6 bits per baud.
The extra tone is the synchronizing signal.
6 bits per symbol. 1 baud is 1 symbol per second.
Happy to see someone using baud, just unhappy about seeing it being
used incorrectly
John Ackermann N8UR wrote:
There is a way to slide the board in that clears the standoffs; almost
impossible to describe so I should make a video of it one of these days!
In general, you slide the board in with a very shallow "angle of
attack" and do an overshoot-and-reverse. I'm sure that'
Peter Vince wrote:
As I understand it, the GPS signals are circularly polarised, and so
surely reflections will reverse the sense of that polarisation such
that the antenna will be insensitive to them?
Yes, as a first degree analysis. However, cancellation will not be 100%
since neither the wa
jimlux wrote:
David C. Partridge wrote:
definition of "pie"
3.1415926535 etc ?
Ooops
D.
And, as my daughter reminds me, today is pi day (in the U.S. where we
write the date month/year.. those of you in the rest of the world will
have to wait a long time, as there is no April 31st)
Nope.
Bob Camp wrote:
Hi
Wedding cake pans normally come in 1" increments and are either 2" or 3" deep. Sets
are 2" increments on the diameter:
http://cooksdream.com/store/wedding-round.html
http://www.hubert.com/store/products.asp?CAWELAID=126235277&A=SB%2E58369%2E10738&Dn=0&An=966+966&Au=Presenta
Joe Gwinn wrote:
Date: Sun, 14 Mar 2010 21:09:00 +0100
From: Magnus Danielson
Subject: Re: [time-nuts] Choke Ring Pictures
To: Discussion of precise time and frequency measurement
Message-ID: <4b9d425c.2050...@rubidium.dyndns.org>
Content-Type: text/plain; charset=ISO-8859-1;
WarrenS wrote:
Bruce wrote:
"Which antenna performance metric do you have in mind?"
Could do GPSDO hold over performance, but that would not be much of a
test of the antenna.
How about the antenna's effect on the ADEV Osc noise and Phase noise.
What else does the Time Nut care about?
Mul
WarrenS wrote:
Magnus wrote:
"Multipath rejection, antenna selectivity, antenna amplifier gain,
antenna noise factor... all weigh in."
And Your point is?
Their effects would all be included in as much as they effect ADEV Osc
noise and Phase noise.
They would show up on the ADEV and phase
Bert, VE2ZAZ wrote:
OK, I am doing a 24-hour ADEV analysis of the HP 5328A Timebase Output when set to divide-by-10,000,000. I use the 10MHz output from an HP 8644A sig.gen. OCXO. I split that 10MHz signal into two; one end goes to the the input of the HP 5328A counter. The other 10MHz end goes to
Hi Bert,
Reverting back to the list for more people to see.
Bert, VE2ZAZ wrote:
Hi Magnus,
No, I don't see why there would be any cycle slips since the readings are
around 65 ns and both Start and Stop come from the same reference OCXO. Quickly
browsing through the data does not show any.
John Miles wrote:
I would tend to say that the divider is pretty lousy for short
term, but it is all fine for longer runs, right?
Is this what I should expect from a TTL/ECL divider chain
designed in the '70s-'80s? How would this compare to a modern
divider chain, like the PIC divider or David P
Demian Martin wrote:
At some point I'll re-run tempco and jitter measurements of the dividers
and 1PPS distribution amps >I have here.
Last time I used a 5370B and a SR620. This time I'd like to try a
Wavecrest. If someone on the list >has done this already can you let me
know?
Thanks,
/tvb
Tom Van Baak wrote:
Hi David,
Thanks for the detailed comments. I understand better
how the two boards differ now. You did a fine job. And
thanks for making it available to the group, with good
documentation and all.
One comment in the use of microcontrollers -- a reason
I (and many others) hav
Bob Camp wrote:
Hi
Can we all come live at your house and play with your toys?
That would cause some troubles with logistics, like places to sleep. ;)
Tom has far more toys than me. I might have a few things he doesn't
have, but other than that he outperforms me in most fields.
So far, onl
Dear Corby,
Corby Dawson wrote:
Bill,
The receiver unit is not sealed.
To remove the lamp assy. you remove the two nuts (one inside) and the 3
shields from the central threaded rod that protrudes from the lamp end.
Then remove the tiny phillips head screws (3) around the circumference of
the
Bob Camp wrote:
Hi
I've had pretty good luck with Quartus setting up delay relationships and optimizing for them. You are correct that you do get speed variations from the slow model to the fast model. Getting it all to work out is usually a two step process. Find the delay clusters and then sho
Bob Camp wrote:
Hi
Good point, pretty much everything I worry about is timing to or from an external pin.
Once it's "inside" it's all clocked to the global clock(s).
If you look at the modern families, you no longer have "only" clocking
on both edges... but even higher rates.
The I/O-bloc
Mark Sims wrote:
Basically it means the unit has lost the battery backup to the calibration memory.
The cure is a rather simple calibration step. On the 5372A you input a 60 mV
10KHz sinewave and perform Test 25.
The adjustment is also called "Maximum Hysteresis"
It also tells you that
John Miles wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]on
Behalf Of Bob Voelker
Sent: Sunday, March 21, 2010 1:59 PM
To: time-nuts@febo.com
Subject: [time-nuts] HP 5065A performance vs. others
As several postings have indicated, the perf
Tom Van Baak wrote:
Group,
If Dave P's current divider design has design jitter specs approaching
SOTA vvs cost levels whilst the TAPR board is (perhaps) slightly
inferior in performance, where does that leave Tom's venerable 1pps PIC
divider in the pecking order ?
Will all designs be subjected
Bruce Griffiths wrote:
The performance of the sine to square wave conversion clock shaper
circuit may dominate the divider performance.
Thus an evaluation of the jitter performance of sine to square wave
conversion circuits would also be informative/useful.
We should standardise some test for e
Mark Sims wrote:
If the battery has not been replaced, you also get the warning message about
the config being lost... Just the 160 error usually means the battery was
replaced, but the system was not recalibrated (or a glitch wiped the memory).
Anyway, I always replace the battery.
The
Bruce,
Bruce Griffiths wrote:
Magnus Danielson wrote:
Bruce Griffiths wrote:
The performance of the sine to square wave conversion clock shaper
circuit may dominate the divider performance.
Thus an evaluation of the jitter performance of sine to square wave
conversion circuits would also be
Tom Van Baak wrote:
The TSC5120A allows phase noise measurements on signals with
frequencies down to 1MHz.
Classical diode mixer based systems can go somewhat lower in frequency.
You should realize that I have reasons to believe that the limit is
one of software parameters rather than anything
Mark Sims wrote:
Nope, Magnus was right... this is Time Nuts... it does indeed make Julian fries.
You can use the hot wire stripper to peel the spud, the Microchine dremel tool
(with instant stop probe brake) to cut the fries, the vacuum pick to move 'em
around, slather them with pas
Bruce Griffiths wrote:
Magnus Danielson wrote:
Mark Sims wrote:
Nope, Magnus was right... this is Time Nuts... it does indeed
make Julian fries.
You can use the hot wire stripper to peel the spud, the Microchine
dremel tool (with instant stop probe brake) to cut the fries, the
vacuum
Dave Baxter wrote:
Relatively easy to do in principle, and good no doubt that this would be
results wise, it's suddenly not a DIY project any more for 99% of
people.
There is now plenty of people doing things like it in DIY projects. The
software is available for free download, the chips is fair
Fellow time-nuts,
I am a curious mind, which should come as no big supprise, and I know
that lots of people have looked deeply into these devices before me.
So, first of all I wonder, what other commands than S and F=<32-bit
hex number> is there? Anything fun? Anything useful? Anything boorin
Dear Raj,
Raj wrote:
Ahem!, time-nuts. Please release all GPS satellites you are holding up on the
other side of the world. I don't seem to have any over my head over Asia.
I wonder what happens to those guided missiles that depend of GPS or those in
vehicles looking for directions ?
Oh, sor
J. Forster wrote:
From an unnamed, but VERY credible source:
"> It might be that the DoD is turning the civilian signals off in combat
areas to deny GPS to the Taliban and others.
Quite possible. This countermeasure was discussed more than ten years
ago.
It is possible to turn of th
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