Jim Palfreyman wrote:
My pet hate is loose and lose.
Perhaps we could form a chapter of the ?
http://www.worldwidewords.org/articles/apostrophe.htm
Dave (G0DJA)
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David Forbes wrote:
This is interesting. It means that I, as an American exporter selling
directly
to end customers in the EU, do NOT need to CE mark my American made products.
I have bought several items from the US for personal use, and not for
resale, I don't remember any of them
is --
Tim,
There is a Yahoo group called NeoNixie that is devoted to the art of
creating nixie clocks. A few of its members - the ones who want their
clocks to be somewhat accurate - are also members of this group.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com
Thomas A. Frank wrote:
Just to add a little confusion to the mix, mine is marked 5/1/03 Rev A
I wonder who will prove to have the last maked TB?
Mine has 4/26/04 Rev E, which I guess is the American notation for 26th
April 2004.
Dave
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Michael Baker wrote:
However, after completing its self-survey it thinks
its elevation is 11.2 meters when the actual elevation
of its antenna (on my house roof) is 28.4 meters.
I've not found any GPS receiver, available to the general pubic anyway,
that correctly reports its height above
There's a discussion of the different height measurements and the errors
found when using 4 Garmin GPS receivers at
http://users.erols.com/dlwilson/gpsvert.htm
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Clint Jeffrey - VK3CSJ wrote:
As for me now, there are a couple of interests, I'm wanting to put together a
receiver operating at 8.4GHz where the PLO is referenced (10MHz) from a OCXO
which in turn is getting it's reference from a GPS Rx with a 10KHz output,
all for the sake of increased
WB6BNQ wrote:
Hi Neville,
In all seriousness, I thought the Rubidium physics package is heated for
reasons. Now that you are heat sinking it, what has happened to the current
draw
for the whole unit ? Or am I misunderstanding something ?
BillWB6BNQ
He's not cooling it, he's
I'm glad to hear that Tom will replace the unit for you. I've worked with Asian
multivoltage switching supplies for years, and what the manufacturer usually
won't tell you is that their primary output (usually the +5) of a multivoltage
PS needs at least a 10 - 20 percent (or so) minimum load in
[EMAIL PROTECTED] wrote:
After connecting all wires to the Trimble plug and made a check if all
voltage is correct and left the PS unit to run
on the table without load/connecting to the GPSDO, about 15min got a
big bang and the Power Supply Unit blow-up.
On my unit the PSU was not working
When I get my Tbolt, I was planning to program a PIC18F6722-based board
I have already designed and produced, into the role of passthru/monitor
to indicate lock. What other features would everyone want to see on a
Tbolt monitor board relative to features/displays? What kit price range
What outdoor bullet antenna are people using for their Tbolts
(manufacturer and model number), where did you find it, and how much
did you pay for it? I'm looking at several eBay antennas and the like
crossing my fingers that the bias voltage and current will work, but
I'd rather
of magnitude better.
Curiously, the icworks.com domain name is now available for purchase.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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WB6BNQ wrote:
Tom Van Baak wrote:
On the DA you will want to ensure all your output cables are of
identical length as this will ensure that all signals are in phase at
the timebase input(s). It's a small thing really a fraction of a
picosecond but it's there and easily compensated for.
Gretchen Baxter wrote:
Hi,
I am doing research for my employer around time synchronization.
I have found a lot of good information at http://www.usno.navy.mil
But does the EU or other European countries have a similar source?
Several universities and scientific organisations in various
At 12:16 PM + 10/11/08, Poul-Henning Kamp wrote:
As former sound technician...
I used to do that stuff too, being the bass player/sound guy in a
cheesy bar band. Loads of fun!
Any more time nuts with sound reinforcement experience?
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--David Forbes, Tucson, AZ
http
that is guaranteed to count
seconds correctly in future years, short of having it receive leap
second announcements twice a year and adjust its timekeeping
accordingly.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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?
It is indeed amusing how the word year so muddies this simple
parameter of celestial mechanics, by inserting politics into the
question.
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Steve Rooke wrote:
I guess the question is, what's the likely-hood of a world standard
time being adopted (sort of like Star Trek)?
I would say it's very unlikely to happen. People tend to prefer the
time in their area to match up with the day. So, having the sun come up
at 7pm wouldn't
the
sun is at its highest). That caused major problems for the
railroads.
-Chuck Harris
Chuck,
I don't think you meant to say sidereal time, which is based the
stars, not the sun. There are 366.25 or so days in a sidereal year!
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com
is that there will be an
announcement soon of a frequency change.
Be ready to retune,
David McGaw
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I appreciate the assistance I've gotten here in getting my Tbolts set
up and generating that beautiful traceable 10 MHz for my benches at
home and work.
I've got a giveback IF someone plans to put it to good use. My
faithful Ballantine 5700A 9 digit nixie frequency counter isn't
Dewars lying around... one of
them could be retrofitted to hold a cryogenic standard if we felt
like it.
But there's the rent of regularly buying that LHe to keep the
standard cold. Kinda like being a drunkard on fine Scotch whisky
without the buzz.
--
--David Forbes, Tucson, AZ
http
Yes it did. But then it ran backwards until I refreshed it!
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Tom Van Baak
Sent: Wednesday, December 31, 2008 6:44 PM
To: Discussion of precise time and frequency measurement
Subject: Re:
with an M12M-T. I have tried a second VIC-100 with the
same results. Would anyone have an explanation for this?
Thanks,
David McGaw N1HAC
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Yes, more correctly I used 2 power inserters, one each way, to shunt
the antenna power around the attenuator so that the antenna is
powered and the GPS receiver sees the antenna as connected.
David
At 08:50 PM 1/14/2009, you wrote:
And I did not make myself clear.
If you were using power
d.sei...@comcast.net wrote:
Since we're on the subject, what does BeO typically look like when it's used
as a washer, heatsink, etc. I ask because I tend to keep everything and I
modify things all the time. Is there any way besides being painted that it
could pass as Al?
-Dave
Dave,
second.
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http://www.cathodecorner.com/
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one to dream about building a real Rb vapor cell timekeeping device that's
all exposed.
Sure, the vapor cell would have to be temperature stabilized, and various other
improvements would have to be made, and it wouldn't work really well.
But think of the geegaw appeal!
--David F
for any help about this.
--ga
German,
I have a 603 manual at the office. I could mail it to you if you
wanted to pay postage, or I could scan a few pages of interest.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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.
EDC306150-ND single sided 15 pin .156 pitch
EDC307300-ND double sided 2x15 pin .156 pitch
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of the receiver and
antenna will not be 1:1 either.
Good luck,
David
At 08:47 AM 4/7/2009, you wrote:
The reason that such cable mismatch isnt a problem is that the VSWR of
the Thunderbolt input is relatively high.
Bruce
Christian Vogel wrote:
Hi Steve,
these frequencies. I was thinking
or ASCII values.
Here's a 30MSPS card:
http://www.advantech.com/products/PCI-1714U/mod_GF-HQHV.aspx
--David Forbes, Tucson
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it's a good indicator
of a website's time source.)
So I don't have much faith in their service, if they can't even get
their website's clock right.
--
--David Forbes, Tucson, AZ
http://www.cathodecorner.com/
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Thanks Stan, W1LEFN41srCape Cod
Stan,
I did this recently. The ink is soluble in, of all things, water!
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http://www.cathodecorner.com/
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and maintenance reasons.
Given that many of these ECL chips are no longer made, keeping them
cool for long life is of utmost importance.
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http://www.cathodecorner.com/
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as well as any
model can, given the clumpiness of failures.
P.5-13 gives the temperature failure rate multiplier for ECL chips:
25C 0.10
45C 0.27
55C 0.42
65C 0.63
75C 0.94
85C 1.4
95C 1.9
So my off-the-cuff guess of failures doubling for every 10C rise is not too
wrong.
--David Forbes
Hi my name is David and I have a rubidium standard. It's a Efratom 100334-006
and outputs 10mhz. What can I do with it?
As I understand it I need to provide it a reference to set it's frequency. I
was thinking it'd be cool to build a counter that counts the waves and is
thereby a clock
If this had been a real message, there would have been content here.
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wrote:
Hej David!
David Bengtson skrev:
If this had been a real message, there would have been content here.
Assuming there had been a real message there, like a presentation of you,
what would it say?
Cheers,
Magnus
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On Tue, Jun 16, 2009 at 6:07 PM, Magnus
Danielsonmag...@rubidium.dyndns.org wrote:
Hal Murray skrev:
david.bengt...@gmail.com said:
I've recently gotten an opportunity to work on a GPSDO at work, and
so I now have a real need to pick up some more information on the
design tradeoffs and
...
On Thu, May 16, 2013 at 12:10 PM, David Hooke
dhooke-re5jqeeqqe8avxtiumw...@public.gmane.org wrote:
OK.
This MV89 is mounted on a PCB with SMA connectors for the EFC, REF and
10MHz. I connected the EFC from the TB to the REF out of the oscillator, not
for very long, and things haven't been quite
be enabled and are functional.
A AD9851 DDS fed 29.4912 MHz and set to multiply by 6 could give
10.3051758 MHz, off by ~3 E-10, well within the range of the
digital control.
73,
David
On 6/2/13 5:19 PM, Tom Miller wrote:
- Original Message - From: Chris Albertson
/PistonTrimmerCapsIndex.html.
Perhaps something that small would not be too bad for shipping.
Regards,
David
On 6/5/13 7:29 PM, Mark C. Stephens wrote:
Talking about punishment, I pulled the old 9390 out yesterday and plugged it in.
Up the GPS came, but after 8 hours, still no lock LED.
(the lock LED
On 14 June 2013 05:48, Perry Sandeen sandee...@yahoo.com wrote:
There are two long standing truths about
electronic equipment. One you can’t have
too much filter capacitance. Two, you
can’t cool too much. (Please spare me
the liquid nitrogen or submarine battery
comments.)
Regards,
On 14 June 2013 20:24, Claudio Girardi claudio.gira...@virgilio.it wrote:
Unfortunately, as far as I understood, you need to be a student at a French
university for obtaining an interlibrary loan.
The global French libraries catalog (http://ccfr.bnf.fr) does not list any
additional (i.e.
On 16 June 2013 01:33, k...@aol.com wrote:
Greetings Gentlemen!
I have been following the thread on HP equipment repair, as I have a bunch
of it and am waiting the inevitable day when something starts to smoke.
That being said, I agree with the gentlemen that say fixing is better than
On 27 June 2013 01:45, Doug Calvert dfc-l...@douglasfcalvert.net wrote:
The BBC recently did a three part series titled Precisoin: The Measure
of All Things.
Part 1 is Time and Distance
Part 2 Mass and Moles
Part 3 Is Heat, Light and Electricity
Probably nothing ground breaking for any
On 27 June 2013 06:08, Doug Calvert dfc-l...@douglasfcalvert.net wrote:
On Wed, Jun 26, 2013 at 10:07 PM, Dan Rae dan...@verizon.net wrote:
And BBC tv shows are not available (legitimately) for download or on demand
outside the UK anyway.
What is your point? Would you prefer that I only
someone, not sure who wrote
I don't know why they think there is additional risk with
international shipments. Just send it with a signature required, and
it has exactly the same risk as any ordinary shipment in the US. But
a lot of vendors feel the same way.
As someone
On 27 June 2013 12:30, Robert Atkinson robert8...@yahoo.co.uk wrote:
It actually even easier than ever now. Ebay.com do a global postage programme
http://pages.ebay.co.uk/shipping/globalshipping/buyer-tnc.html#paymentsplit
The seller ships it to a US processing center (an item I just won went
and will oscillate without the crystal controlling it - just try
it with a resistor for feedback and a capacitor to ground at the input,
no crystal.
David N1HAC
On 6/27/13 6:30 PM, paul swed wrote:
I will say the fact is the 74hc14 is a bit of a power pig we are talking 12
ma. The rcvr
On 9 July 2013 04:52, Mark Spencer mspencer12...@yahoo.ca wrote:
Hello, I've just reviewed the thread from earlier this year regarding low
noise power supplies and some related information about the noise levels of
certain batteries.Has anyone ever come across any data pertaining to the
On 11 July 2013 05:47, Mark Spencer mspencer12...@yahoo.ca wrote:
Eric:
http://tf.nist.gov/general/pdf/1133.pdf
discusses the noise levels of various batteries.
Regards
Mark S
Sod's Law comes into play here. From a quick read of that, it seems
NiCd are best, but they are being phased
On 14 July 2013 04:09, Perry Sandeen sandee...@yahoo.com wrote:
List,
I just purchased a HP 3585 spec analyzer on E bay
The problem is I didn’t know the beast weighed a svelte
88 pounds! Double Hernia time!
An SA is generally not something one moves around a lot, but if you
do, and have
The Earth's geomagnetic field has been unsettled (K=4) and the Solar
Wind magnetic field has been negative (energizing) all day. Could be a
setup for a big kick.
David
On 7/14/13 9:56 PM, paul swed wrote:
Well this is pretty strange.
Working on the WWVB d-psk-r and testing a new simple
On 15 July 2013 14:19, Robert LaJeunesse rlajeune...@sbcglobal.net wrote:
Rigol, unlike most of the Asian based manufacturers, does have a support
office in the States. They have also had a noticeable presence at the Dayton
Hamvention. I'm rather pleased with the low-end Rigol scope I bought
and high.
David
On 7/21/13 9:02 AM, Jim Lux wrote:
I don't have a GPS-18 in front of me, and I'm modifying some software
remotely, and I ran across an issue that someone on this list probably
knows off the top of their head.
Does the GPS-18 put out 1pps pulses even if it hasn't got a fix
to around 1Hz. Are
there any analysis packages I should look at to explore PN output, or is
spectrum lab the best best?
Thanks from a beginner.
david
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That's my HP 117A receiver that I listed. It's $120 and I pay for shipping.
It's the last of three I had. Shipping will cost between $20 -$25 depending on
where you live. I could either offer it for sale or send it to the landfill. I
chose to offer it to someone who might want to own a piece of
.
David
On 7/25/13 10:21 AM, paul swed wrote:
Debating the band belive ideal for older is +-3V. But I would need to
check. And how old is old? Not to sure many of the old 1488 1489 devices
are around anymore.
I think more compatibility would be supported by the +-1.4 you mention.
Regards
Paul
LORAN can be good to 60 ft.
On 7/27/13 12:21 AM, Jim Lux wrote:
On 7/26/13 8:45 PM, J. Forster wrote:
I gather from the article, the GPS position was spoofed and the
autopilot,
in bringing it back to where it was supposed to be, actually took it off
course.
There are places where a few
anyone recognise these boards and have experience with extracting
10kHz from them?
Regards,
David Smith
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and follow
seems to work for me, though it may not be pedantically
correct. Hal might have some comments on if it could easily be
improved. It might be an interesting option to have in the NMEA
driver, but it does seem a litle hacky.
David.
--- refclock_nmea.c.orig2010-11-10 03:38:22.0
is an Intel i210 and supports hardware timestamping. My
Ethernet switch also supports 1588 as Class A traffic.
I can't seem to find a manual specific for the Z3805A.
Are the 3.58 MHz ACPI timers okay or should I use the 25MHz HPET ones
for system clock?
--
David Gravereaux davyg...@pobox.com
the use of the phc2sys utility?
Probably a better question for the linuxptp group.
--
David Gravereaux davyg...@pobox.com
signature.asc
Description: OpenPGP digital signature
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On 08/20/2013 01:16 PM, Poul-Henning Kamp wrote:
In message 5213b89d.4070...@pobox.com, David Gravereaux writes:
I guess I can't go with TSC on this hardware.
You never should, for precision timekeeping, for a host of technical
hacks, all outside your control.
The most interesting
On 08/20/2013 01:16 PM, Poul-Henning Kamp wrote:
In message 5213b89d.4070...@pobox.com, David Gravereaux writes:
I guess I can't go with TSC on this hardware.
You never should, for precision timekeeping, for a host of technical
hacks, all outside your control.
Good to know, thanks. I
On 08/20/2013 01:51 PM, David Gravereaux wrote:
Also, and still back to my question, NTPd's control of the radio and PPS
signal wouldn't be using the same PPS kernel service would it?
Answering my own question, the clock at /dev/ptp0 (on the NIC) is not
the same as the realtime and needs
Here is an announcement article:
http://www.sciencemag.org/content/early/2013/08/21/science.1240420.full
David
On 8/23/13 10:51 AM, Frank Stellmach wrote:
Wow, this new type of clock is not even 100 times more longterm stable
than the Cs fountain clock, it's even short-term stable as a H
Option 001 for the 5342A did use a 10544A which looks like it just plugs
into the same socket as the standard oscillator. As Rick says, the
10811 will also work.
David
On 8/28/13 12:30 PM, Richard (Rick) Karlquist wrote:
I have an 18 GHz HP 5342A frequency counter, which I don't seem
BTW, the venerable Motorola MC12061 oscillator is a bipolar version of
this circuit. It was good for audio clocks in the 12 MHz range,
including VCXOs using a series varactor.
David
On 8/10/13 2:34 PM, Bob Camp wrote:
Hi
Any bets on weather or not they have actually designed a 12.8 MHz
HTBasic (RMB) and PN3048 using a NI GPIB card. I'm very pleased!
Thanks.
david
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Sorry Folks,
I had included an image from the 3048A Ops manual, but it didn't show up
in the post. The question remains valid however.
Cheers,
david
Hi Folks,
This is from the June 1990 version of the HP 3048A System Ops manual:
Does anyone have a secret stash of the RMB A.03.0x
The first character was dropped off:
http://io9.com/5947112/watch-32-discordant-metronomes-achieve-synchrony-in-a-matter-of-minutes
On 9/13/13 1:44 PM, Tim Shoppa wrote:
I first read about this is Scientific American a couple decades ago. A
slightly different set of clocks become largely
Compromise.
On 9/13/13 7:56 PM, Max Robinson wrote:
Question about the two metronome experiment. Is the slow one sped up
or the fast one slowed down? Or do they arrive at a compromise?
Regards.
Max. K 4 O DS.
Email: m...@maxsmusicplace.com
Transistor site
be multiple solutions.
The TV oscillator example is different as the driving source is not
influenced by the locked oscillator.
Now, can we lock multiple atomic oscillators together into a
super-accurate ensemble?
David
On 9/13/13 10:13 PM, Bill Hawkins wrote:
Maybe not. We need the math
NIST is off-line due to the shutdown.
http://www.nist.gov/pml/div688
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I have one of those crystals too. Have the oven somewhere. Had the
chassis, just like the picture. Would have made a great anchor for a
battleship.
David N1HAC
On 10/3/13 6:24 PM, paul swed wrote:
Yes remember back then there was Ready Kilowatt (Detroit Edison) power was
cheap cheap
They recommended using 75 ohm TV cable with F connectors as being
low-loss and cheap. The 50-75 ohm mismatch is negligible in this
application.
David
On 10/4/13 12:38 PM, Eric Garner wrote:
why do older thunderbolts use an F connector for the antenna? (the
current version uses a BNC
The correct link is http://www.jpl.nasa.gov/hijuno/
David N1HAC
On 10/8/13 1:17 PM, Paul K. wrote:
FYI
Follows is a post I picked up off of the Drake Group.
It sounds interesting.
Paul K.
WA0BAG
Hello ALL;
NASA spacecraft Juno, bound for Jupiter, will have a earth fly-by
Wednesday
amplifier is that it requires something like 16V so needs a
separate supply.
73,
David N1HAC
On 10/25/13 7:01 PM, Chuck Forsberg WA7KGX wrote:
Splitters for satellite TV pass DC to/from one receiver
and block it for the others. The GPS frequency is well within
the satellite downlink
to understand the red and blue
settings, the default PID parameters and the rim/mass ratio controls.
Thanks,
david
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Hi Ed,
My E1938 also came from a very battered STLN4096A from the same source,
and I might also try to get the other boards functional. Could you share
the details of the GPS connections, and which GPS receiver you used?
Cheers,
david
I recently purchased a Motorola STLN4096A with the HP
Thanks Ed (and Skip),
I've bolted the PCBs back together, and have it connected both via
SatStat and Ulrich's Z38XX. I'll let the oscillator cook for another
week and check the PN and ADEV, and if the E1938 looks good, figure out
the UT+ configuration.
Cheerio.
Hi David,
Skip Withrow
the influence of the package.
David
On 11/2/13 1:07 AM, Bob Camp wrote:
Hi
The real answer is that nobody knows. The economics essentially make finding
out very expensive. Q most certainly goes up, I don’t think anybody disputes
that. The questions about flicker / ADEV all revolve around small blank
Can you tell whether it is coming from Wildwood or another site?
David N1HAC
On 11/14/13 9:02 PM, paul swed wrote:
Sounds pretty good not banging in here like the old chain did.
austron 2100 says 38db
srs700 says 47 rcvr gain and 25 db noise margin.
hp3856b's says -53dbm or 500uv.
Regards
on a sound card. You can
get lots of (slightly noisy) samples per second. I took chunks of
this data and took the Fourier transform to find the dominant
frequency:
http://www.maths.tcd.ie/~dwmalone/time/leap2012/#mains
but I guess you could filter it and count crossings too?
David
This should be equivalent to the Synergy Timing 3000 antenna:
http://www.synergy-gps.com/images/stories/pdf/anttiming3000_tn888.pdf.
David N1HAC
On 12/12/13 2:59 PM, Dave Brown wrote:
They do ship internationally but to a limited number of countries. For
some reason the UK is not on the list
I pointed out a while ago that the modern chips like the MAX232 have a
positive receiver threshold so TTL drive is fine for short runs.
73,
David
On 1/27/14 10:35 AM, Javier Herrero wrote:
On 27.01.2014 15:08, Attila Kinali wrote:
In practice, the receiver chip only has one power supply
range is quite welcome.
Please let me know what you have- even if they're being sold.
Thanks!
David Jensen
djen...@ieee.org mailto:djen...@ieee.org
w8pdp
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as it does lend some isolation between the receivers.
David
On 2/4/14 4:50 PM, mike cook wrote:
Le 4 févr. 2014 à 22:35, Volker Esper a écrit :
http://www.ebay.de/itm/HP-58516A-GPS-1-4-signal-Distribution-Amplifier-Splitter-N-type-/300997787447?pt=US_Ham_Radio_Receivershash=item4614ddbf37
.
David.
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It makes sense that they would be using that chain. Seneca is the
primary and an eLoran station.
David
On 3/2/12 1:51 PM, paul swed wrote:
13:50 89700 great lakes is back on the air -65 db austrons locking.
So it would seem several things.
Crazy propagation today
They dropped power and shut
The article was accepted for publication on Feb 22, 2012in
Physical Review Letters.
The March issue has already been published, so maybe this one will be in
the April issue.
The title is
Single-ion nuclear clock for metrology at the 19th decimal place
Authors:
C. J. Campbell, A. G.
On 16 March 2012 16:22, Rix Seacord eseac...@verizon.net wrote:
Luckily, I use PayPal for most of my online purchases.
From the experience of a friend, who bought something eBay that needed
refunding by Paypal, it was a long complex process
1) Buy bandbag from eBay she believed was a fake.
2)
It appears that TI has entered the GPS market. I don't know if this would make
a good start on a GPSDO or not? Comments?
https://estore.ti.com/SimpleLink-CC44000-GPS-Development-Kit-P2945C159.aspx
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Mechanical wristwatches are capable of good precision. I have an
inexpensive 40-year old Caravelle (Bulova) that with reasonable
adjustment can still keep to a few seconds per day. I never have
considered quartz watches to be better unless they can be adjusted,
which most cannot.
David
What would it take (how big a dish) to receive a pulsar directly, such
as the millisecond one in the Crab Nebula? DBTV, TVRO?
David
On 3/28/12 2:29 PM, Tom Knox wrote:
If pulsars are natures best clocks, I wonder how practical it would be to use
satellites to receive and rebroadcast
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