Dear Luciano,
What do you need to know?
Beefing up Wikipedia articles is indeed a nice thing, but lets hear what
you look for.
Cheers,
Magnus
On 07/13/2015 09:20 AM, tim...@timeok.it wrote:
Hi all,
I am looking on Wikipedia a description of the Residual Phase Noise but this
page do not ex
Dear Ulrich,
Indeed. I think it's really not meaningful of saying it is additive,
just as it is not meaningful to say residual. Any buffering/amplifying
stage will add phase noise (and amplitude noise). We will have
conversion between AM and PM to some degree. For higher quality stuff,
the le
Dear Ulrich,
Nice performance on your 10 GHz oscillator then!
I was not aware of that level of performance from a more regular
oscillator source.
Wish you luck with solving the power amplifier stage phase noise issue.
The FSWP is indeed a nice new box for the task. Wish I had one. Already
th
Hi,
There is indeed investigations going on about what the cost of receivers
would be etc. A benefit of Loran-C is that relative jamming/spoofing
resistance can be had without the need of opening up for keyed
receivers. This helps for non-military and non-government operations.
Now, there is
Fellow time-nuts,
Since I haven't seen any reports on this, I though I would write down a
few lines.
While normal counters use a pair of phase-samples to estimate the
frequency, now called Pi counters (big pi, which has the shape of the
weighing function of frequency samples), counter vendor
d, description about the Phase Noise introduced, or Added, by a
"non generative" devices.
thanks,
Luciano
On Mon 13/07/15 17:37 , Magnus Danielson wrote:
Dear Luciano,
What do you need to know?
Beefing up Wikipedia articles is indeed a nice thing, but lets hear what
you look for.
Poul-Henning,
On 07/14/2015 06:16 PM, Poul-Henning Kamp wrote:
In message <55a4ac81.1030...@rubidium.dyndns.org>, Magnus Danielson writes:
The safety is
relative, in that it takes quite a bit of more infrastructure compared
to the jamming of GPS, and that lies in the wavelen
they rarely do).
Implementing this for "frequency only" in the BBB would not be too hard
if you like to do that.
I need to install my BBB board one of these days.
Cheers,
Magnus
Thanks!
-Chuck Harris
Magnus Danielson wrote:
Fellow time-nuts,
Since I haven't seen any reports
Ole,
What is the value of the "2E21" resistor?
Looks like a typo. 2k?
Feel inspired to rig up something for my FS700.
Will wooden frame my TP-cable wired to form a 8 turns times the cable-turns.
Cheers,
Magnus
On 07/16/2015 09:05 AM, Ole Stender Nielsen wrote:
I use a home-made untuned loop
09:21 PM, Ole Stender Nielsen wrote:
Hi Magnus,
The 2E21 is a 2.21 Ohms resistor.
The RC network was found useful to ensure loading at higher frequencies.
Best regards
Ole
Den 16-07-2015 kl. 18:27 skrev Magnus Danielson:
Ole,
What is the value of the "2E21" resistor?
Looks like a
I was thinking along these lines.
Cooking up a 3-pole filter in the form of a Pi-filter should be a good
start, and then add traps for third and possibly fifth overtones that
will not get much damping initially can be done if you need it pretty clean.
Cheers,
Magnus
On 07/17/2015 04:07 AM, Gr
Dear Ulrich,
On 07/17/2015 01:15 PM, ka2...@aol.com wrote:
Simulated 5 Mhz phase noise, only very little deviation from measured data.
Happy weekend, Ulrich N1UL
Looks like you did your homework well, which is expected. :)
Would love to have more devices with that kind of phase-noise.
MVH
Ma
ogy posted earlier by Charles is indeed quite adequate.
You can get -60 dbc harmonics without
going very crazy on the design. Part values can either be calculated from formulas
that have existed for > 80 years
or you can play with simulation.
Bob
On Jul 17, 2015, at 4:07 AM, Magnus Danielso
Dear Ulrich,
Now you taught me something useful, that the SC-cut has inherent less
noise than AT-cut. Many thanks.
Indeed, measuring below 1 Hz starts to be challenging as environmental
aspects chimes in. I assume you ovenize your crystals, to make use of
the turn-over point.
Even for oven
matic for the trap used in a
Colpitts
oscillator which will look like 58pF at 5MHz and will be inductive at
5.5MHz. So something like this can be used in place of a pair of one of
the split capacitors at ~56pF loading the crystal.
Jerry N9XR
On Sat, Jul 18, 2015 at 11:59 AM, Magnus Danielson
Hi,
On 07/25/2015 03:35 AM, Charles Steinmetz wrote:
skipp wrote:
[the 10MHz output is] not even close to being symmetrical. The waveform
on-portion (duty cycle) appears (surprising to me) to be much less
than 20%
Now I'm under the assumption that proper rounding or conversion of the
non
sy
Good morning,
On 07/28/2015 11:51 PM, Poul-Henning Kamp wrote:
Sorry this is a bit long-ish, but I figure I'm saving time putting
in all the details up front.
The canonical time-nut way to set up a MVAR measurement is to feed
two sources to a HP5370 and measure the time interval between their
z
Hi James,
On 07/30/2015 06:34 PM, James Peroulas wrote:
My understanding is that MVAR(m*tau0) is equivalent to filtering the phase
samples x(n) by averaging m samples to produce x'(n)
[x'(n)=1/m*(x(n)+x(n+1)..x(n+m-1))] and then calculating AVAR for
tau=m*tau0 on the filtered sequence. Thus, MVA
Hi Poul-Henning,
On 08/01/2015 10:32 PM, Poul-Henning Kamp wrote:
In message <49c4ccd3-09ce-48a4-82b8-9285a4381...@n1k.org>, Bob Camp writes:
The approach you are using is still a discrete time sampling
approach. As such it does not directly violate the data requirements
for ADEV or M
Poul-Henning,
On 08/03/2015 01:07 AM, Poul-Henning Kamp wrote:
In message <55bdb002.8060...@rubidium.dyndns.org>, Magnus Danielson writes:
For true white PM *random* noise you can move your phase samples around,
but you gain nothing by bursting them.
I gain nothing mathemat
Hi,
On 08/08/2015 07:05 PM, Bob Camp wrote:
Hi
A factory reset will not brick the unit.
Either:
1) Your TBolt is blown
2) The cable has an issue
3) The antenna has an issue.
I've seen them all over the years, so neither is necessarily the most
likely. I'd also add:
4) Power-issue
5) Seria
Alan,
Do not worry about that sky-view.
I'd guess your issue is more local, as on your roof.
Still, in timing you can afford to drop a lot of satellites if you only
got a good fixed position.
Cheers,
Magnus
On 08/04/2015 11:02 AM, Alan Ambrose wrote:
p.s. here's the view south taken from abo
Ole,
I checked with a former Pendulum employee, and free off memory, he
recommend trimming up the 100 MHz until Error 2 does not show. Sensing
it directly can be difficult, FET-probe essentially mandatory.
Indirectly a 10 MHz is possible. A problem is that trimming with the
hood off causes a
Nick,
To get you started, I would use a free-running Rubidium and a
time-interval counter. The rubidium will be having the wrong frequency,
but that should cancel out in the Allan deviation processing. The drift
of the rubidium clock will form a limit, but you can overcome that by
using eithe
Hi,
I warmly recommend people to play around with Tom's GPSDO-SIM tool. It's
a quick way to get some important learnings about what knobs do what on
the response.
Cheers,
Magnus
On 08/16/2015 09:31 PM, Tom Van Baak wrote:
Hi Nick,
Nice project. Thanks for sharing.
I was hoping someone wou
Magnus,
I have a few of these counters and would love to see the details of the
calibration process you mention.
Cheers.
david
On 17/08/2015 5:16 AM, Magnus Danielson wrote:
Ole,
I checked with a former Pendulum employee, and free off memory, he
recommend trimming up the 100 MHz until Error
Great news! :)
Cheers,
Magnus
On 08/17/2015 09:33 AM, Ole Petter Ronningen wrote:
Fantastic, just what I needed. Thank you!
On Sun, Aug 16, 2015 at 9:16 PM, Magnus Danielson <
mag...@rubidium.dyndns.org> wrote:
Ole,
I checked with a former Pendulum employee, and free off memo
Hi,
http://ascii.textfiles.com/archives/4711
Impressive! I think we shall be thankful for the huge effort being done.
Cheers,
Magnus
On 08/18/2015 09:00 AM, Poul-Henning Kamp wrote:
http://ascii.textfiles.com/archives/4683
http://ascii.textfiles.com/archives/4695
htt
Dear Poul-Henning,
I have been suspecting this very mechanism to exist in the HP5065 among
others. I have not been overly impressed by the stability by which the
current is produced.
It would be interesting to see to what degree the surrounding
temperature as well as the mains supply voltage
Hmm, could it be change of GPS week, which occurs then?
Cheers,
Magnus
On 08/18/2015 11:38 PM, Esa Heikkinen wrote:
Gerhard Wittreich kirjoitti:
Heol is sending me and another "timenut" a new GPS board with the updated
firmware. If you have an early version of the board, be on the
lookout fo
Dear Mathias,
On 08/19/2015 06:40 PM, Matthias Jelen wrote:
Hello,
I´ve got a question concerning ADEV-measurements.
I´m measuring the 15 MHz output of a KS-24361 with my SR-620 with it´s
internal (Wenzel) OCXO using Timelab. For the first shot I used the
counters frequency mode with 1s gateti
agnus
Cheers,
Matthias
Am 19.08.2015 um 21:52 schrieb Magnus Danielson:
Dear Mathias,
On 08/19/2015 06:40 PM, Matthias Jelen wrote:
Hello,
I´ve got a question concerning ADEV-measurements.
I´m measuring the 15 MHz output of a KS-24361 with my SR-620 with it´s
internal (Wenzel) OCXO using Ti
Poul-Henning,
Using ADEV and MDEV, and indeed TDEV as TVB points out, for analyzing
other physical signals than phase/frequency is maybe not very common,
but if Kocher if you know your field well enough.
David Allan and I discuss this every once in a while. ADEV/MDEV and
friends is really th
Hang on a minute, polarity does not switch all of a sudden.
However, a short or a glitch could cause the signal to be garbled such
that we incorrectly interpret it as inverted. It can also be the result
of the signal 0 to 5V being triggered on the 0V line on the wrong transient.
It might be t
Hi,
On 08/26/2015 06:28 AM, Brian M wrote:
Hi -
So I took the time tonight to poke at things with the scope. Hopefully it
will be of interest.
First off, I probed the MCU (MC68HC11) TX line directly. And, it looks like
I misstated in my last mail. The MCU itself is 5V TX idle TTL Serial. On
th
I think you put too much into the detector without concerning the rest
of the design. The XOR gate is a 1-bit multiplier. If you have nice and
clean "digital" signals, it is a good choice.
What makes a PLL or FLL a poor design is not down to only the detector,
it is also to the rest of the des
Hi again,
A frequency detector uses a phase-memory one way or another.
Digital FLL detectors recall the sequence of events, see 4046
Phase-Frequency Detector.
Using a phase detector, just differentiate the phase data to get a
frequency difference estimate, however phase-wrapping usually upset
Hi,
On 08/29/2015 10:01 AM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
On 28 Aug 2015 23:05, "Oz-in-DFW" wrote:
The uncertainly listed seems to be 7.6 mHz (milliHertz, or .0076 Hz. A
bit better that you mention..
No, please look again.
The first line does show an uncertainty of 7.6 mH
Skip,
I had some fun post-processing your data.
If we believe this to be a representative set, then on average they age
about -3E-11/year. Plotting it (error vs. years and error/year vs.
years) gives no real clue.
Cheers,
Magnus
On 08/28/2015 04:37 AM, Skip Withrow wrote:
Hello time-nuts,
Martyn,
Thanks for this report. This is exactly why I invested in the time-pod
and why I use 2 reference sources for measurements.
It would be interesting to see papers on the validation of these
measurements.
Cheers,
Magnus
On 08/29/2015 01:54 PM, Martyn Smith wrote:
Hello,
HISTORY
I m
Hi,
On 08/29/2015 11:24 AM, Neville Michie wrote:
A PLL locks on to the nearest cycle,
is a Time Locked Loop different?
Yes and now. In a signal conveying time, rather than letting a rising
edge denote "0 degrees of phase" you have some even time measure
occuring, of some known nominal rate
ee. There are only antiques, except possibly the
HP 3335A synthesizers and Racal Dana 1882 counters. I've tried to sell a
few times but have had no takers. I won't ship (no time) but you can
hire someone to pick it up.
-----Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo
John,
On 08/31/2015 12:37 AM, John Miles wrote:
The is a publication by the NPL that talks about a similar technique, but
comes to a somewhat different conclusion.
http://publications.npl.co.uk/npl_web/pdf/mgpg68.pdf
Bottom line: it holds that the phase noise of all three sources can be
determ
Hi Ulrich,
On 08/30/2015 09:58 PM, KA2WEU--- via time-nuts wrote:
This is the measured phase noise of the 10 MHz output. Not quite state of
the art but stable frequency .
Any other data of other oscillator available ? 73 de Ulrich
For the fun of it I did a few quick and dirty measurements s
Poul-Henning,
On 08/30/2015 09:54 PM, Poul-Henning Kamp wrote:
In message <1698d85b-ebb6-45e3-9cb0-cbf780ce5...@n1k.org>, Bob Camp writes:
Since they needed to calibrate the voltage swing, there aren’t a lot of options
with the technology they were using at the time. Today there are a
Hi John,
On 08/31/2015 05:12 AM, John Miles wrote:
On that note, did you look more closely on the NIST analysis of
cross-correlation and a possible cancellation and thus overly optimistic
results? Did it have any consequence on your code? What did you take
away from it?
Yes, you can definitely
founded ….The
741 only
was designed in 1968….The 5065 design dates to roughly that time.
Bob
On Aug 30, 2015, at 8:08 PM, Magnus Danielson
wrote:
Poul-Henning,
On 08/30/2015 09:54 PM, Poul-Henning Kamp wrote:
In message <1698d85b-ebb6-45e3-9cb0-cbf780ce5...@n1k.org>, Bob Camp
Poul-Henning,
On 08/31/2015 08:28 AM, Poul-Henning Kamp wrote:
In message <55e39af2.2050...@rubidium.dyndns.org>, Magnus Danielson writes:
Ehm, eh... that transistor pair you have there. How *tight* together is
really the transistors thermal connection? I bet not all tha
Good afternoon,
Sorry, unintentionally killed of the webserver during an upgrade.
It's up there again.
A somewhat shorter URL for the same picture is:
https://rubidium.dyndns.org/~magnus/time/timelab/OSA8600_1.png
Cheers,
Magnus
On 08/31/2015 12:30 PM, KA2WEU--- via time-nuts wrote:
Good Morn
Hi,
On 09/04/2015 11:37 PM, Poul-Henning Kamp wrote:
In message <89828.1441376...@critter.freebsd.dk>, "Poul-Henning Kamp" writes:
I actually have some calculations relevant to this, I'll write them
up on my homepage when I have a second.
Here:
http://phk.freebsd.dk/hacks/H
Hi,
On 09/07/2015 02:23 AM, Tom Van Baak wrote:
Finally analyzing the data with Tom Van Baak's adev1 (
http://www.leapsecond.com/tools/adev1.htm)
[paul@localhost Documents] $ ./adev1 1 < ../datafile.txt
Hi Paul,
There's also the adev4 and adev5 tools too. But my main suggestion is to use
Jo
Analog is nice and dandy, but for longer time-constants, digital does
have it's merits.
Wonder how good resolution one really need for sensing and how to
achieve it.
Cheers,
Magnus
On 09/15/2015 12:58 PM, Bob Camp wrote:
Hi
To the extent that the oven controller is an integrator, it only
Jim,
I had the intent to try this, but never got around doing it. Thanks for
reminding me. Please share any enhancements.
I did exchange some emails with Lars, but as that project never got off
the ground, it faded out.
Cheers,
Magnus
On 09/21/2015 10:02 PM, Jim Harman wrote:
Hi Can,
Fo
Jim,
There is some systematic bumps in there which make me wonder what
happens here. Care to share data/plots for phase?
You want to understand the systematics when it looks like that.
Cheers,
Magnus
On 09/23/2015 09:09 PM, Jim Lux wrote:
a bit more than 5 minutes of data.
Now to go get a
Hi,
Another method would be to measure the phase-detector beat-note
frequency (most have mixer-like behavior), which you should be able to
measure with quite good precision, then set the EFC accordingly and then
close the loop.
If you measure for sufficient time, and fail to detect a beat-no
Hi Hal,
On 09/26/2015 11:47 PM, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
Another method would be to measure the phase-detector beat-note frequency
(most have mixer-like behavior), which you should be able to measure with
quite good precision, then set the EFC accordingly and then
Hi,
On 09/27/2015 02:04 AM, Bob Camp wrote:
Hi
If you digitize the beat note it’s fairly simple:
The beat note is not really a sine wave. It’s periodic, but not a pure sine. The
reason is fairly simple. The frequency changes as the beat note changes the EFC.
You have a lower frequency as it ge
Poul-Henning,
On 09/27/2015 09:46 AM, Poul-Henning Kamp wrote:
Discovery of the day: The voltage supplied to the Rb87 lamp changes
the frequency on the order of 1.5e-11 per volt.
I have no idea why...
http://phk.freebsd.dk/hacks/HP5065A/index.html
I can think of two mechanisms in play
Hi,
On 09/27/2015 02:35 PM, Poul-Henning Kamp wrote:
In message <5607d3b0.80...@rubidium.dyndns.org>, Magnus Danielson writes:
You should be able to servo the intensity using the DC intensity level
detected by the photodetector.
That would require a way to steer the intensi
Hej,
On 09/28/2015 04:17 PM, Attila Kinali wrote:
On Sun, 27 Sep 2015 07:46:26 +
Poul-Henning Kamp wrote:
Discovery of the day: The voltage supplied to the Rb87 lamp changes
the frequency on the order of 1.5e-11 per volt.
I have no idea why...
http://phk.freebsd.dk/hacks/HP5065A/i
Attila,
On 09/29/2015 09:05 AM, Attila Kinali wrote:
On Mon, 28 Sep 2015 22:59:27 +0200
Magnus Danielson wrote:
There should be somewhere a mention how much the frequency shift
of an Rb vapor cell due to light intensity change is, but i couldn't
find a good number in a couple of minute
Poul-Henning,
On 09/29/2015 10:01 PM, Poul-Henning Kamp wrote:
In message <560ac40b.1040...@rubidium.dyndns.org>, Magnus Danielson writes:
If possible, I'd also check the spectrum of the lamp before and after
the filter, depending on different lamp voltages, temperatures
On 09/30/2015 12:29 AM, Poul-Henning Kamp wrote:
In message <560b0e63.1060...@rubidium.dyndns.org>, Magnus Danielson writes:
For instance, the lamp oscillator is
open-loop, so supply voltage and temperature effects will factor in
undamped. Servo up the intensity seems to
Hi,
I did measure the phase-noise of a FS710 with my TimePod and saw the
same as you. Cross-correlation is a nice tool in the toolbox.
It was really clear that the OSA cesium was much cleaner than the FS710
buffered variant of the signal.
The sawtooth is expected, and the caps just makes su
Fellow time-nuts,
Next week is filled with interesting stuff as we gather in Potsdam for this:
https://www.ptb.de/8fsm2015/about-the-symposium/
I and Attila will be there, so who will join us?
PS. For the moment I actually don't know how many Cs-clocks I have...
it's complicated.
Cheers,
Ma
iche Nachricht-
Von: time-nuts [mailto:time-nuts-boun...@febo.com] Im Auftrag von Magnus
Danielson
Gesendet: Freitag, 9. Oktober 2015 20:55
An: Discussion of precise time and frequency measurement
Cc: mag...@rubidium.se
Betreff: [time-nuts] 8th Symposium on Frequency Standards and Metrology
Fe
Hi,
On 10/09/2015 09:35 PM, Rami Vainio wrote:
On 7.10.2015 14:45, Arthur Dent wrote:
I believe that like a lot of the Meinberg receivers that
this uses a down converter to give an IF frequency of
35.4 MHz. If you don't have the converter that apparently
isn't included with the receiver you hav
Hi,
On 10/07/2015 04:06 AM, Bob Benward wrote:
If anyone is interested, a Rohde & Schwarz GPSDO:
Rohde & Schwarz GPS RECEIVER ED170MP MEINBERG 2105.5504.00
http://www.ebay.com/itm/262081245211?_trksid=p2055119.m1438.l2649&ssPageName
=STRK%3AMEBIDX%3AIT
Ok, who is the lucky winner that out-bi
Meanwhile I like his book better, but the Best book isn't too bad for
some people. Wolaver is another good book. They excell in different aspects.
Cheers,
Magnus
On 10/17/2015 12:33 AM, Alexander Pummer wrote:
actually my old friend Dr. Floyd Gardner -- who is the pope of the phase
locked loop
Hi,
On 10/17/2015 01:57 PM, Tom Van Baak wrote:
Martyn Smith wrote:
All we want to do is lock a 10 MHz ULN OXCO to a rubidium.
So basically a clean up loop.
Then we can provide an ULN output from the ULN OXCO and long term stability
from the rubidium.
The 10 MHz ULN OXCO has phase noise of –11
otel Saturday, all but one was gone. Strange
feeling, but I then got to meet a friend who now lives in Berlin, and
that warmed me up again. :)
Cheers,
Magnus
On 10/09/2015 08:54 PM, Magnus Danielson wrote:
Fellow time-nuts,
Next week is filled with interesting stuff as we gather in Potsdam
rough the week.
Cheers,
Magnus
On 10/19/2015 01:04 AM, Bob Camp wrote:
Hi
Very interesting
Thanks!!
Bob
On Oct 18, 2015, at 5:50 PM, Magnus Danielson wrote:
Hi,
I thought a small report might be appreciated.
It's been a very intensive week. Fellow time-nuts Attila Kinali and
Hi,
On 10/22/2015 07:54 AM, Rob Seaman wrote:
Mark Sims said:
Ars Technica just put up a piece on the effects of various attacks on NTP with
a link to the original paper.
http://arstechnica.com/security/2015/10/new-attacks-on-network-time-protocol-can-defeat-https-and-create-chaos/
The Ne
Bob,
It was linked from the article. Some 18 pages of reading. Go and read
it. I will when I get the time... can somebody skew my time by skew my
NTP? Just read the article, it tells you how to pull it off.
Cheers,
Magnus
On 10/24/2015 03:02 PM, Bob Camp wrote:
Hi
Without the real paper(s)
Hi,
It is well worth mentioning that a crystal filter on the output can
become a challenge, as the source impedance can be far from 50 Ohm, and
thus a bit of a challenge depending on how you measure.
Cheers,
Magnus
On 10/28/2015 06:11 AM, Bruce Griffiths wrote:
Ulrich
Surely you meant to w
It's chapter 6 in his phase noise book.
Cheers,
Magnus
On 10/28/2015 11:04 PM, Richard (Rick) Karlquist wrote:
Do you have a specific URL for "hacking oscillators"? I can't
find it on Rubiola's web site.
Rick
On 10/28/2015 1:32 PM, Gerhard Hoffmann wrote:
Am 28.10.2015 um 19:22 schrieb KA2W
Hi Chris,
On 10/31/2015 11:50 AM, Chris Wilson wrote:
31/10/2015 10:46
I have a Racal counter locked to 1 MHz on its rear panel external
input socket from my Trimble Thunderbolt GPS. I derive the 1 Mhz
from a David Partridge divider board. If I also feed the counter
with th
Hi Chris and Bob,
On 10/31/2015 02:13 PM, Bob Camp wrote:
Hi
On Oct 31, 2015, at 6:50 AM, Chris Wilson wrote:
31/10/2015 10:46
I have a Racal counter locked to 1 MHz on its rear panel external
input socket from my Trimble Thunderbolt GPS. I derive the 1 Mhz
from a David Partr
Paul,
On 11/09/2015 01:07 AM, paul swed wrote:
Because the roll over is a pain.
Thats good engineering if they checked that far.
What happens if you have a receiver that doesn't handle it correctly is you
do not tend to get satellite lock because the dates all wrong.
No. The GPS internal date-
Chuck,
Because all the leap-second info is kept in GPS-calender form, and
essentially indicating current leap-second difference and which GPS week
(modulo 256). Check out the ICD for yourself, IS-GPS-200H:
8<---
20.3.3.5.2.4 Coordinated Universal Time (UTC).
Page 18 of subframe 4 includes: (
Paul,
On 11/10/2015 08:58 PM, paul swed wrote:
There is a good discussion about old GPS receivers that have been running.
Its the NAVSTAR proteus thread.
Very good details in that thread about some issues. Such as the 1024 week
rollover and that the receiver should still keep working. Though the
Bob,
The single-shot does not improve, it's 500 ps, but the averaging of N
samples give you that result. The 53131 does similar tricks.
Cheers,
Magnus
On 11/17/2015 02:27 AM, Bob Camp wrote:
Hi
At leas on the spec sheet I found, both counters have a single shot of 500 ps.
The
6680 “improve
Bob,
To illustrate your point.
The original PM6681 calibration setup includes a PC, an ancient Philips
ISA-bus GPIB interface and an ancient Philips driver and a DOS program.
Collecting these and put them together to work will be an interesting
challenge.
A more modern variant of the calibra
Hi,
Lacking the charging controller in mine, what would be a good approach
to go about and build one?
Need to replace the battery setup in my XSRM setup too, the packs I
installed is now dead.
Tempted to think in terms of LiFePO.
Cheers,
Magnus
On 11/21/2015 03:45 AM, Dan Rae wrote:
On 1
Hi,
On 11/27/2015 05:03 PM, Tom Van Baak wrote:
They mentioned some "6 miles per day" offset due to GPS relativity effects.
I think this is the sum of both special relativity (time dilation) and
general relativity (gravitational) effects. The GR correction is 45
microseconds a day fast; the SR c
The trouble is that they experience different acceleration, due to
gravity, and this yanks the experienced time. In the relativistic world,
the concept of time is not consistent between locations, and the effect
of acceleration between two locations shift it, and this is a
consequence of a fixe
Hi,
On 11/28/2015 06:05 PM, Mark Sims wrote:
The GPS spec implies the satellites have a fixed frequency offset to compensate
for relativistic effects.
The spec actually points out that explicitly. This is the General
Relativity shift due to different gravitational position of the satellites.
Paul,
Many GPS receivers only use 2,046 MHz bandwidth, but some use the full
20,46 MHz even if they only do C/A. Guessing that you are working on
down-conversion for an old box, then 2,046 MHz will be your answer.
Cheers,
Magnus
On 11/30/2015 06:37 PM, paul swed wrote:
I am looking at build
Hi,
This is a side-track to Pauls original question, but maybe a nice little
point to make now that Peter touched on the subject.
To elaborate a little on C/A and multipath surpression.
The multipath surpression of the receiver depends on code rate,
bandwidth and correlator spacing. P-code is
then will
follow that with 30 db of gain at 75 MHz.
At least thats my thinking.
Regards
Paul
WB8TSL
On Tue, Dec 1, 2015 at 1:36 AM, Magnus Danielson
wrote:
Hi,
This is a side-track to Pauls original question, but maybe a nice little
point to make now that Peter touched on the subject.
To e
Jim,
On 12/05/2015 11:45 AM, Poul-Henning Kamp wrote:
In message
, Jim Palfreyman writes:
The weird thing is that the jump is ~0.7ns and that 1/0.7E-9 is close-ish
to 1420.4MHz which is the hydrogen line. Too much of a coincidence for me.
Is there a direct digital divider chain to
Bert,
Extending the RG-6U using N-connectors should not be giving you more
than 0.20 dB, probably less. Considering that you have have 6.12 dB per
100 feet in RG-6U at 1 GHz (should be about 8 dB @ 1.575 GHz), so it
will be more. Using N-connectors to extend the cable-stretch isn't going
to b
David,
You obviously is not working with 75 Ohm N-connectors on a regular basis.
Also, the point was to show that using proper connectors isn't going to
be a major issue in the loss process.
Cheers,
Magnus
On 12/06/2015 07:58 AM, David J Taylor wrote:
Bert,
Extending the RG-6U using N-conn
God kväll Attila,
On 12/08/2015 05:32 PM, Attila Kinali wrote:
Moin,
I've been digging through some stuff and stumbled (again) over Rick's
paper on high resolution, low noise DDS generation[1] and got confused.
The scheme is very simple and looks like to be quite easy and reliably
to implement.
Jim,
On 12/08/2015 07:09 PM, Jim Lux wrote:
On 12/8/15 8:32 AM, Attila Kinali wrote:
Moin,
I've been digging through some stuff and stumbled (again) over Rick's
paper on high resolution, low noise DDS generation[1] and got confused.
The scheme is very simple and looks like to be quite easy and
Azelio,
You don't get BVA performance easily out of an oscillator being
significantly less stable than a BVA. Some environmental aspects you can
dampen, some you can compensate, but then as you hit the fundamental
noise processes of the oscillator. Knowing how systematics affects the
oscillat
God kväll,
On 12/09/2015 11:47 AM, Attila Kinali wrote:
God eftermiddag,
On Tue, 8 Dec 2015 23:45:52 +0100
Magnus Danielson wrote:
If you would setup essentially a micro-stepper design, such as those
being used for cesium and hydrogen masers, but maybe adapted to a
hobbyist needs and with
Poul-Henning,
On 12/09/2015 09:24 AM, Poul-Henning Kamp wrote:
In message <56675da0.4050...@rubidium.dyndns.org>, Magnus Danielson writes:
So, what did I miss? Why do people use DAC-EFC control instead of
the DDS scheme?
The main reason I would say is habbits, people have h
hread, so it may have already
been mentioned.
Merry Christmas,
Don
Magnus Danielson
God kväll,
On 12/09/2015 11:47 AM, Attila Kinali wrote:
God eftermiddag,
On Tue, 8 Dec 2015 23:45:52 +0100
Magnus Danielson wrote:
If you would setup essentially a micro-stepper design, such as those
being
Hi,
Vremya also have such boxes. The current one, VCH-317, goes under the
name "Real-Time Atomic Clock Combiner" which may not give you the
initial association of it being a micro-stepper. I have read the manual
for an older box, or at least an older description, which included a
nice descrip
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