with an Iridium ground station (just above the GPS L1 frequency)
for scientific balloon data that had a new cell installation placed
nearby. We had (and thankfully were able to) have the cell base station
shut down while we were flying.
73,
David N1HAC
On 7/11/22 9:27 AM, paul swed via time
Are you sure the PN floor of the measurement instrument isn't the limiting
factor?
David
-Original Message-
From: Erik Kaashoek via time-nuts
Sent: 04 July 2022 10:14
To: time nuts ; Erik Kaashoek
Cc: Erik Kaashoek
Subject: [time-nuts] DIY Low offset Phase Noise Analyzer
place
for drafts - right below the air conditioning unit. I will look at moving
that.
Dave.
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On Tue, 28 Jun 2022 at 20:04, Bob kb8tq via time-nuts <
time-nuts@lists.febo.com> wrote:
> Hi
>
> The “typical” 10811 struggles when shut down for a while. Once the oven
> is turned off, the boards are just sitting there in whatever environment
> your
> lab provides. Do they soak up humidity or
by this time, is it just pot luck? I think it's the latter, but
maybe some are double-ovens and some single.
With the exception of power cuts of up to a few hours, the HP 10811-60111 I
fitted has been continuously powered on for a few years. But due to soaring
power costs, I am going to switch my ovens of
On Fri, 10 Jun 2022 at 17:39, Lux, Jim via time-nuts <
time-nuts@lists.febo.com> wrote:
>
> On the subject of rapid warm up. I suppose if you had a need, one could
> dump as much power as you need into the heater. Turn on oscillator,
> lights in room dim for a few moments.
>
Is that not likely
SSH.
Ask if you have further questions.
David
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.
To you guys in the USA or elsewhere, where places like NIST do not have
open-days, perhaps you can use the fact NPL does, to get your own national
metrology labs to have open-days.
Dr David Kirkby Ph.D
Email: drkir...@kirkbymicrowave.co.uk Web:
https://www.kirkbymicrowave.co.uk/
Kirkby Microwave Ltd
-Center or Lady Heather?
David
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If they are all in the same enclosure and powered from the same supply how are
you going to prevent injection locking?
Or do you want them to injection lock?
D.
-Original Message-
From: g...@hoffmann-hochfrequenz.de
Sent: 02 April 2022 08:22
To: Discussion of precise time and
a graphical add-on, if
not a text simulation of a graphical display. Mine was u-blox u-center with a
serial line actually from an RPi HAT, operated stand-alone.
73,
David GM8ARV
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on the other side of the north pole. More or less, there
is a big coverage blank area over the poles with GPS.
Even north of Hadrian's wall we get GNSS satellites overhead. Here's with an
indoor antenna dual-band setup. None reach 40 dB.
David
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<http://www.leobodnar.com/shop/index.php?main_page=index=107=15a
92055b16c36edbdc83f4ac8fb8abc>
D.
-Original Message-
From: David C. Partridge
Sent: 28 February 2022 13:56
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000
Maybe take a look at:
http://www.leobodnar.com/shop/index.php?main_page=index=107=15a9
2055b16c36edbdc83f4ac8fb8abc
-Original Message-
From: John Moran, Scawby Design
Sent: 28 February 2022 13:26
To: time-nuts@lists.febo.com
Subject: [time-nuts] GPSDO - GPS1300-10-1000 by RFX Ltd. UK
. On the '9046, pin 5 shuts the whole chip down, but there is
a way to force the oscillator to a zero frequency.
73,
David N1HAC
On 2/22/22 8:09 AM, Bob kb8tq wrote:
Hi
Best guess:
Your 10 MHz (for whatever reason) is being turned into a fast edge
square wave. That’s dumping current spikes
Probably more than you want but ... <
http://www.ko4bb.com/getsimple/index.php?id=the-new-thunderbolt-monitor-kit>
-Original Message-
From: Wojciech Tomczyk via time-nuts
Sent: 19 February 2022 12:07
To: time-nuts@lists.febo.com
Cc: Wojciech Tomczyk
Subject: [time-nuts] Trimble
corrupted and may take a while to reset. I also have a procedure I got
from Garmin to clear it if it does not take care of itself.
David N1HAC
On 2/9/22 10:57 AM, Andy Talbot wrote:
Yes, I had to disable the GSV sentence to get the data flow down to a level
that could be sent at the lower speed.
I'm
with a much faster timebase?
Cheers,
David
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one of the relatively old
edition's that I have doesn't provide it.
My previous answer mentioned precision, of course, not accuracy. And the error
I mentioned was not the error in GPS which places the zero degree meridian some
102m east of Greenwich!
David
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tale that some students at Cambridge did this in
the late '60s or early '70s and getting about a second or two accuracy, and
discovering that the longitude of the Cambridge Observatory was some hundred
metres out. You might find a reference, and I might be mistaken!
Cheers,
David
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I have a couple of Trimble UCCMs. They would not come ready unless pin
39 of the 50 pin ribbon connector is grounded. This selects the 1PPS
sync source. Ground is internal, open is external.
73,
David N1HAC
On 12/24/21 7:39 AM, Wilko Bulte wrote:
hi Francois,
That EEVblog thread
he current component shortage.
73,
David GM8ARV
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the GPS as you
know. The "o" tally code suggests that's OK.
I suggest using the "pool" directive rather than multiple pool servers:
https://www.satsignal.eu/ntp/setup.html#pool
Cheers,
David
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Thanks for that! I was only aware of a limited subset of that as I came later
to NTP on Linux (it was mostly Windows before), and I understood even less at
the time! Your notes helped clarify things, thanks.
David
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driver but it's no longer
accessible, and a workaround runs in user space, hence user mode.
Cheers,
David
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any
help. FreePascal/Lazarus both source and executable available:
https://www.satsignal.eu/raspberry-pi/DigitalClock.html
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Twitte
I can see a handful of them in my ntp leap second monitoring data.
https://www.maths.tcd.ie/~dwmalone/time/leaps/ntp2021Nov-leapbits.png
The regular data for June and December is here:
https://www.maths.tcd.ie/~dwmalone/time/leaps/
David
a little (Windows) program to check this.
Cheers,
David
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constant. Unfortunately they have been adopted for computer Real
Time Clocks, which is why most computers do not keep very good time.
David N1HAC
On 11/26/21 9:14 AM, Scott McGrath wrote:
Usually in analog quartz clocks oscillator frequency is around 32khz
Content by Scott
Typos by Siri
On Nov 26
On 25/11/2021 08:14, Hal Murray wrote:
(according to a pre-configured compile-time constant),
Have you looked at the tinker stuff in the config file? I'd expect it to be
there.
I don't see it in there, Hal.
David
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# Use pool NTP servers
pool nl.pool.ntp.org iburst
pool uk.pool.ntp.org iburst
See:
https://www.satsignal.eu/ntp/setup.html#pool
Cheers,
David
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Twitte
on 24x7 is best.
Be aware that many of the public stratum-1 servers are overloaded and perhaps
not as good as you might want.
Cheers,
David
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Shake:
https://raspberryshake.org/
The devices are not at the professional seismograph level. They operate a
world-wide network.
73,
David GM8ARV
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On Sun, Aug 29, 2021 at 10:43:51AM -0400, paul swed wrote:
> We my only issue is every time we had a lightning storm it seemed to
> fry the ICs.
While they may not have ideal behavior with temperature (and
related phase/group delay changes) the old antique 10Mbs era balanced
twisted
, "Lots of fun!"
John
Most interesting, John, thanks for posting.
(Accidentally send directly, sorry.)
David GM8ARV
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not have this. On the other hand, as has been
said, the Bodinar unit has poor hold-over performance if you lose GPS
lock, which here in NH amongst the trees and hills can happen fairly
frequently. As a result, I use OXCO GPSDOs with an external synthesizer.
David N1HAC
On 7/20/21 1:32 PM
it
with your (Android) phone/tablet which can display the signal strengths.
You could consider using something which sticks to the outside of the
window if the attenuation is too great? Cable through a small hole, or
where the window opens?
73,
David GM8ARV
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I would take 2 also.
Thanks,
David
> On May 1, 2021, at 11:10 AM, Bill Notfaded wrote:
>
> I'd be interested in 2 too.
>
> Bill
>
>> On Wed, Apr 28, 2021, 4:10 AM Michael Gindonis
>> wrote:
>>
>> I would be interested in at least one,
as to what the final price may be.
Cheers,
David
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Speaking of aspirational, for those interested in time travel (that
comes under "time nuts", no? ;-) ) there is this:
https://www.oreillyauto.com/flux-500.html
David N1HAC
On 4/3/21 11:10 AM, David Witten wrote:
It seems to be aspirational.
It has been on the SparkX page for a lon
It seems to be aspirational.
It has been on the SparkX page for a long time now.
Dave
> Date: Sat, 03 Apr 2021 07:15:13 +
> From: "Poul-Henning Kamp"
> Subject: [time-nuts] Sparkfun lists SA.35m
> To: Discussion of precise time and frequency measurement
>
> Message-ID:
On Sun, Mar 14, 2021 at 07:43:03PM -0700, lmcdavid wrote:
> I have 3 WWVB AM clocks that did not update DST overnight last night
> but one that did and two BPSK clocks that did. Par for the course. The
> BPSK clocks always set correctly within 10 minutes any time of day.I
My 4 BPSK
It looks like NPL are in the process of creating some courses on this.
Introduction to Time and Frequency Measurement
https://elearning.npl.co.uk/enrol/index.php?id=53
I think I read something on the NPL site to imply that was free, but I
can't see that now. Anyway, it's not available yet, but it
, they were 1 metre apart,
on ground planes, with excellent sky view.
[]
Thomas
Any chance of adding X and Y scales to the graphs?
David
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ated new topics and update on numerical controlled oscillators . Thanks,
> Ulrich
> >
> > Sent from my iPhone
> >
> >> On Aug 18, 2017, at 2:58 PM, David Bengtson
> wrote:
> >>
> >> That's good news. It would be good to have a single reference for
Stamp on the top is 1000 kHz in Russian.
David N1HAC
On 2/28/21 6:35 PM, Dan Kemppainen wrote:
Hi All,
I've picked up a couple of old crystals. Mostly because they look
neat. They are 1Mhz, in a glass tube. The quartz is ~25mm dia, at
about 1 mm thick. Was able to get them to oscillate
if the deviation exceeds 60 seconds are larger corrections
than 10 mHz allowed.
That may however be out of date.
David
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A clock that uses an NMEA stream for its display will be a few hundred
milliseconds slow, dependent on the chosen data products and serial baud
rate, as NMEA gives the time of the previous second mark.
David N1HAC
On 12/27/20 9:54 AM, Andy Talbot wrote:
I've just had a look around the house
In the Kenilworth, UK ...
I have a working 5372A for sale. Collection preferred, but can ship if
necessary.
Sensible offers OFF list please.
David
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microprocessor, and
SN74ALS160, and SN74ALS162 bus driver chips. It includes source code
and a (quite small) PC design, in Eagle.
I've built this, with PC design modified to use a 32LQFP package.
It works, at least for the simple use cases I've tried.
David
On 2020-11
k
diamond, which is a form of carbon, is the best thermal conductor, and
around 5x better than copper.
Dave
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–Rebka experiment). It is cool that we now have
clocks accurate enough to detect changes of the order of meters and
getting better.
David N1HAC
On 10/29/20 10:32 PM, The Fiber Guru wrote:
I actually had the privilege of hearing David Allan present his theories in the
yearly NIST conference
Note that WWVB is 60kHz, not 65kHz.
David N1HAC
On 10/18/20 10:35 AM, paul swed wrote:
Andre you can add layers of litz wire. You actually have litz wire? Thats
hard to find these days. But it most likely will need to be more than a few
layers. I would slip to small pieces of cardboard on both
What about using a the hot-air gun technique to migrate the Rb from the walls
of the lamp back to the well?
David
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Bob kb8tq
Sent: 28 September 2020 14:23
To: Discussion of precise time
ew
Jersey!
David N1HAC
On 8/14/20 5:52 PM, Dana Whitlow wrote:
Thanks, Paul.
Does this "standard marine preamp" have an integrated antenna of some kind?
If not (or you're not using it), can you tell me about the antenna you
*are* using?
I've not "heard" so much as a pe
oubt an 18 s error is going to be significant, but I can reset
the time to UTC.
Dave.
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Reg
*16 -- --- MODE Hold
*11 -- --- *17 -- ---
*12 -- --- 30 71 148 LAT N 51:39:04.128
LON E 0:46:36.375
ELEV MASK 10 deg *attempting to track HGT +46.29 m
(MSL)
HEALTH MONITOR ...
Hi Paul,
Is Wildwood transmitting now or will they be? I am not seeing anything
in NH.
Thanks,
David N1HAC
On 8/5/20 10:00 AM, paul swed wrote:
Hello to fellow time nuts.
Warm up those old Austrons. eLORAN out of New Jersey has been on the air
intermittently prior to a test run next week
IIRC the Thunderbolt DOES lock its internal clock to the GPS
David
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Bob kb8tq
Sent: 13 August 2020 14:39
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] ! PPS Source
On Tue, Aug 11, 2020 at 10:27:33PM -0400, paul swed wrote:
> Just saying they work for all those atomic clocks for $10.
Those don't give a damn about 60 KHz delay/phase provided it
doesn't change very fast (as it wouldn't due to thermal effects).
But monitoring frequency or
Would someone be able to send me a PDF of the Austron 2100F manual? I
have an F, but would also be interested in looking at the T manual, as
well. Thanks.
73,
David N1HAC
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The generic WWVB receivers in radio-controlled clocks are essentially
TRF receivers using a 60kHz crystal as the tuned element.
David N1HAC
On 7/22/20 2:26 PM, Hal Murray wrote:
tsho...@gmail.com said:
I myself did some experimenting with a tuned loop antenna through a 60 kHz
crystal
I have an 8640B in the lab. Bizarre instrument.
David
On 7/13/20 2:57 PM, Richard (Rick) Karlquist wrote:
On 7/13/2020 11:34 AM, jimlux wrote:
There are also "frequency locked" devices that are not "phase locked"
- they essentially discipline an internal oscilla
with a direct Ethernet LAN connection you may find
that's quite good if (and it's a big if) you have a stratum-1 Ethernet
source available.
Cheers,
David
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David,
I've seen your comparison in the list archives. However, none of the
approaches I have seen published so far (including yours) exploit all the
possibilities I mentioned.
The Raspi having better community support doesn't help if the platform
itself
is unfit for the purpose. It might
id make a comparison earlier which
showed the BBB to be better, yes, but certainly not enough for me to change
given the other factors.
Cheers,
David
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it accepts. Only one of my four works!
https://lists.ntp.org/listinfo/questions
Cheers,
David
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Here's a web page with several JK flip-flop dividers, including divide
by 5:
http://www.play-hookey.com/digital/counters/frequency_dividers.html
Dave
On 2020-06-30 15:47, dschuecker wrote:
> Hi,
>
> a divide by five should possible with a synchronous state-machine made of 3 (
>
Dr David Kirkby Ph.D C.Eng MIET
Email: drkir...@kirkbymicrowave.co.uk Web:
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Kirkby Microwave Ltd (Tel 01621-680100 / +44 1621-680100)
Stokes Hall Lodge, Burnham Rd, Chelmsford, Essex, CM3 6DT.
On Sun, 28 Jun 2020 at 12:44, Tom Van Baak wrote:
> About sl
the same version level as Meinberg (both one release out of date), and
as Meinberg's compilation of the port works I don't see any reason to
change. Make me wonder why they are bringing out their version.
73,
David GM8ARV
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r texts).
>
> -aps
IIRC there are two profs and both had written text books on GPS.
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a faster
serial port speed.
Lady Heather gets the time from the GPS receiver once, but then either
1) Windows reports the program is not responding.
2) The clock runs backwards.
I thought it might be worth trying different serial port settings.
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Kirkby Microwave Ltd,
dr
My HP 58503A is using the default 9600 8N1 for serial communication. It
would be nice to run the connection faster, and there are commands to
change the serial port speed, as well as reset the serial port settings to
the defaults. What concerns me is that if I try to run the serial port
faster,
ort.
It's something I've been asked for by users in my own software.
Cheers,
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The "GCS" command does that.
BR,
Matthias
==
Thanks, both. I'd looked at the help screen and not spotted it. I still
think that a "standard" click on column header to sort would be more
intuitive.
Thanks to Mark for the program.
Cheers
In Lady Heather, it would be useful to sort satellites by dBc. I can't see
a way to do this. Perhaps clicking on one of the table headings (e.g. dBc,
PRN AZ EL etc.) could enable that column to be sorted?
Thanks,
David
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the SI
units. I must have watched the video on that ten times before I was
confident I had a reasonably good understanding of that.
The 40 minutes for the exam was more than enough time.
Dave.
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https
You can watch the PBS American Experience program on him, "The Secret of
Tuxedo Park" here:
http://www.pbs.org/wgbh/americanexperience/films/secret-tuxedo-park/#part01
David N1HAC
On 5/12/20 7:56 PM, Tom Van Baak wrote:
Yes, the book about Loomis by Jennet Conant is highly r
BNC
adapters are common). I even have some amplified splitters, though I
modify them so they pass the normally 5V from GPS RXs to antenna and
have external 12V power for the amplifier.
73,
David
On 4/29/20 8:18 PM, Frank O'Donnell wrote:
I'm looking for a splitter to allow three or four GPSDO's to sh
,
David GM8ARV
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s seems to sync only overnight, so that may suit them. Actually we've
been enjoying a spell of good weather the last couple of weeks, so an
earlier period might have been ideally suited.
https://www.npl.co.uk/msf-signal
73,
David GM8ARV
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/performance_ntp.php
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be interested in some oscillator measurements made by
Daniel Estévez showing some unexpected steps. His blog is here:
https://destevez.net/2020/04/wiggles-in-the-qo-100-local-oscillator/
It's a fascinating story, and may not yet be complete.
Daniel is a GNSS Engineer by occupation.
Cheers,
David GM8ARV
Well, that's how it's supposed to be done, but these days the usual (and often
only) criterion other than part value (e.g. 15V 200uF +/- 10%) seems to be cost
(cheapest == best).
Sad isn't it.
David
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf
IIRC the latter
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Dana
Whitlow
Sent: 10 April 2020 11:06
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Phase noise confusion II
Question about definition of jitter:
If you look at the way the power is supplied to and output is taken from an
MMIC there's no way that I can see that they could go all the way to DC as
there's always a capacitor in the output ...
I got all excited a while back when I considered an MMIC for a project because
the spec said
The service manual says it is a manufacturer's part number T06/46 which
is a Saft number and a Google search shows a number of equivalents,
including the Tadiran.
David N1HAC
On 3/29/20 5:35 PM, Charles Steinmetz wrote:
Matthew wrote:
It looks like I need to replace the battery in my
Folks,
Thanks for all the help. I've put up a simple Web page showing the program
and its results here:
https://www.satsignal.eu/ntp/Raspberry-Pi-ntpheat.html
A good gain on that Raspberry Pi in a centrally heated room and nearer the
radiator than it should be.
Cheers,
David
Don't buy the 82357B - hardware is fine but the Keysight IO Libraries software
is totally dreadful. See recent posts by myself on
hp-agilent-keysight-equipm...@groups.io and EEVBlog
David
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Perry
I think it would be a dead-band.
David N1HAC
On 3/10/20 2:41 PM, djl wrote:
Is this effectively dither on the control voltage?
On 2020-03-10 10:30, Skip Withrow wrote:
Hello Time-Nuts,
A couple of weeks ago I posted regarding some weird behavior of the
Trueposition GPSDO that I was seeing
. :-)
David N1HAC
On 3/6/20 1:41 PM, Peter Loron wrote:
This is really shouldn’t be an issue. Many car manufacturers are leveraging and
improving already existing cellular data systems in their cars to provide
software and firmware updates over the air. I suspect the issue is more the
long supply chain
GMT EVERYWHERE!!
--
David VanHorn
Lead Hardware Engineer
Backcountry Access, Inc.
2820 Wilderness Pl, Unit H
Boulder, CO 80301 USA
phone: 303-417-1345 x110
email: david.vanh...@backcountryaccess.com
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!
Cheers,
David
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
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to this.
Cheers,
David
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
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on NTPsec, which I
don't use.
Temperature is certainly the prime contributor to instability here (or
temperature variations produced by CPU load variations).
Cheers,
David
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter
RPi server is a lowly RasPi 1B, and it runs at
2% CPU, ~43 C CPU (averaged over a day). It lives in an unheated cupboard
on an outside wall.
Cheers,
David
--
SatSignal Software - Quality software for you
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv
I remember opening up those military crystals and sanding them down with Ajax
cleaner to raise the frequency or rubbing a little solder on the plate to lower
it for CW transmitters.
High school days.
--
David VanHorn
Lead Hardware Engineer
Backcountry Access, Inc.
2820 Wilderness Pl, Unit H
Re: China, I heard a piece on NPR that gave the opinion that the virus
would only survive a few hours on a surface. Anything coming from China
should be fine. We are probably more likely to die from panic. ;-)
David N1HAC
On 2/4/20 4:54 AM, Clint Jay wrote:
Actinic short wavelength UV
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