The $25 widget from Dataq. 4 channels, 10 bits, serial port
http://www.dataq.com/products/startkit/di194rs.htm
They have others.
I've also used the Eval boards from Maxim or Nat Semi, but these day's they're
usually USB. Sometimes, the protocol isn't published, but is trivially reverse
engine
Test of quoting of responses..
This looks better, at least from here..
James Lux, P.E.
Task Manager, SOMD Software Defined Radios
Flight Communications Systems Section
Jet Propulsion Laboratory
4800 Oak Grove Drive, Mail Stop 161-213
Pasadena, CA, 91109
+1(818)354-2075 phone
+1(818)393-6875 fax
discussion, and you certainly have
the right to do as you choose, but I would ask, that at minimum, you
don't put chevrons in front of your new reply lines when you respond to
previous messages.
-Rex
Lux, James P (337C) wrote:
>-Original Message-
>From: time-nuts-
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Hal Murray
Sent: Wednesday, July 29, 2009 2:51 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] looking for good description/generalized model for
tim
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Christian Vogel
Sent: Wednesday, July 29, 2009 11:51 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] looking for good description/generalized model for
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Hal Murray
Sent: Wednesday, July 29, 2009 11:45 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] looking for good description/generalized model for
time
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of J. Forster
Sent: Wednesday, July 29, 2009 10:19 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] looking for good description/generalized model for
tim
I'm looking for a good (short) description and/or a generalized model for
relating a local time counter to some external reference. Here's the scenario..
A computer has a local clock that is a counter being driven by a local
oscillator.
Periodically, we get "time updates" from some outside sour
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Richard W. Solomon
Sent: Tuesday, July 28, 2009 9:21 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] What's the cleanest way to produce 1 and 5 MHz fro
On 7/28/09 4:47 AM, "J. L. Trantham" wrote:
> If you want a 'vintage' solution, the HP 5087A can be configured to take a
> single 5 or 10 MHz and divide/multiply it to 10 MHz, 5 MHz, 1 MHz and even
> 0.1 MHz then feed that to various output amplifiers of 10, 5, 1 or 0.1 for
> up to 12 total ou
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Brooke Clarke
Sent: Monday, July 27, 2009 7:04 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Position accuracy to improve Thunderbolt performance
Hi Warren:
I've found Google
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Robert Atkinson
Sent: Friday, July 24, 2009 12:55 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] adjustable gain/offset amplifiers
I have an EG&G (No
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of J. Forster
Sent: Friday, July 24, 2009 11:35 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] adjustable gain/offset amplifiers
Hi Jim,
A couple of th
I'm looking for some amplifiers with adjustable gain (say from 0 to 5) and
offset (say +/- 5V) for general benchtop use (e.g. you have some widget you
want to test as a replacement, but the original device had different input
ranges, and before you go redesign the rest of the circuit..) with at
On 7/24/09 6:32 AM, "Stephan Sandenbergh" wrote:
> Hi,
> Many sources and papers refer to the actual DMTD mixer system (and
> zero-crossing detector etc.). But, I've seen very little on the phase
> shifter circuits, that are used in conjunction with this system.
>
> I was hoping some of you m
Hey Chuck, I just learnt a new word: Gonzo :-)
I has a nice feel to it -- out of interest do you have the etymology? I
assume of US/Mexican origin?
Does it have any implied meaning other than that which I inferred: i.e.
idiotic?
See: Hunter S. Thompson, "Fear and Loathing in Las Vegas"
>Fro
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Poul-Henning Kamp
Sent: Tuesday, July 21, 2009 10:45 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Where does 28V come from?
In message <768062.16062
The issue of returning equipment for repair is a significant concern. Unless
you have the appropriate licenses both ways.. Company A in Germany, say,
ships a widget to company B in the US, all nicely approved by whoever in
Germany (maybe they didn't even need a license). Widget breaks and Company
S
In message , "Lux, James P (337C)" writ
es:
>ITAR and EAR are complex and[...]
Actually, the Vasenaar Convention made all that a lot simpler.
---
Not that much simpler..
You still have the Basic List and Munitions list, and the terms on the list are
vague enough that there&#
On 7/16/09 12:38 AM, "Jim Palfreyman" wrote:
> Don't forget books are not covered under ITAR.
>
> That's how the original PGP got distributed legally.
>
> Jim
>
> 2009/7/16 Robert Atkinson
>
Not without some hassles for Phil Zimmerman (although it was ostensibly the
distribution of PGP o
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of J. Forster
Sent: Wednesday, July 15, 2009 10:54 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] [Fwd: Accurate Thunderbolt position]
"Mark Sims" wrote:
>>
>> My Ashtech Z12 system has
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Brooke Clarke
Sent: Tuesday, July 14, 2009 3:56 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Accurate Thunderbolt position
Hi Mark:
0.1 degree
On 7/13/09 1:59 AM, "b...@lysator.liu.se" wrote:
>
>
>> What typically-available surplus receivers do carrier phase
>> measurements[1]? I'm close to putting up a choke ring antenna I scored
>> off of the surplus market on the roof -- I don't think the wife is going
>> to let me build a pro
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Joseph M Gwinn
> Sent: Tuesday, July 07, 2009 5:21 PM
> To: Discussion of precise time and frequency measurement
> Su
>
> The relevant US pipe-thread standards are quite clear -
>
On 7/6/09 5:37 AM, "John Ackermann N8UR" wrote:
>
> Of course, an alternative is to assign one USB or LAN GPIB unit to each
> instrument, but that gets expensive.
>
Yes, if you're scrounging old test equipment for $100 a copy. If you have
chunks of gear that cost $10K each, then $100-200
On 7/4/09 8:36 PM, "Robert Darlington" wrote:
> I have a GPIB-LAN, and it works. You basically telnet to it and issue
> commands either manually or via software. It works with EZ-GPIB without any
> trouble. It's extremely easy to use.
>
> That being said, it is not a substitute for a GPIB
On 7/4/09 7:43 PM, "Chad Simpson" wrote:
> Hello all, this is my first post to the list...
>
> Like many of you, over time I've acquired enough test equipment with the
> GPIB interface that I'm wanting to make use of it. I have narrowed the
> choice down to one of the Prologix devices (GPIB-
On 7/4/09 1:49 PM, "Hal Murray" wrote:
>
>
>> I've not attempted to butcher a capsule open to determine the cause -
>> this to my mind is bordering on the sacrilegious but if given
>> absolution from another TimeNut, I may attempt it and photograph the
>> results ...
>
> What have you got t
http://www.uspto.gov has a pretty good search engine for US patents (with
images, if you load the AlternaTiff plugin)
> > > Try http://ep.espacenet.com/ It's an offical european
> site that
> > > also searches US and World Patents. Very flexible
> search options
> > > and no registra
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com
> Sent: Tuesday, June 30, 2009 2:48 PM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Plug and play GPSDOs was:(no subject)
>
> -
> Something like thi
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims
> Sent: Tuesday, June 30, 2009 2:32 PM
> To: time-nuts@febo.com
> Subject: [time-nuts] Plug and play GPSDOs was:(no subject)
>
>
> Yes, you can just leave the unit runnin
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of John Ackermann N8UR
> Sent: Tuesday, June 30, 2009 11:40 AM
> To: les...@veenstras.com; Discussion of precise time and
> frequency measurement
> Subject: Re: [time-nuts] Plug and pl
> -Original Message-
> From: Lester Veenstra [mailto:m0...@veenstras.com]
> Sent: Monday, June 29, 2009 11:22 AM
> To: Lux, James P; les...@veenstras.com; 'Discussion of
> precise timeand frequency measurement'
> Subject: RE: [time-nuts] Orbiting crystals
>
Isn¹t Inmarsat in a Clarke Orbit? If the propagation path for the solar
eclipse shadow experiment runs through the eclipse with the path from Clarke
orbit to you, then there's tons of signals available to look at.
On 6/28/09 10:48 PM, "Lester Veenstra" wrote:
> INMARSATS Look at tracking bea
On 6/28/09 4:35 PM, "Magnus Danielson" wrote:
> iov...@inwind.it wrote:
>> James Lux wrote:
>>
>>> Ah.. That's easy.. Pretty much every satellite in orbit derives its transmit
>>> frequency from a crystal oscillator, either a TCXO or a OCXO. So all you
>>> have to do is pick a LEO satellite
On 6/28/09 3:23 PM, "iov...@inwind.it" wrote:
> James Lux wrote:
>
>> Ah.. That's easy.. Pretty much every satellite in orbit derives its transmit
>> frequency from a crystal oscillator, either a TCXO or a OCXO. So all you
>> have to do is pick a LEO satellite that is easy to receive and mea
On 6/28/09 2:59 AM, "iov...@inwind.it" wrote:
> Thanks all.
>
> Let's explain why I would like to look at orbiting crystals.
>
> Making experiments during eclipses would almost always mean
> that a measuring instrument should be put in the eclipse path.
> This is not always possible, or at l
200kHz is a bit tricky for the top end.. That probably puts the standard music
recording A/D out of the picture (although they have very high performance A/Ds
in them, and because of large production volume, they're relatively
inexpensive).
Almost any PC these days has enough processor to take
On 6/19/09 6:38 AM, "optoma...@rogers.com" wrote:
> Hey Robert
>
> Great tip about the attenuator.
>
> I looked up some models on the internet and some look fairly expensive.
> I know that I will always be injecting low voltage signals, do you think
> it would be wise to buy a cheaper fixed
We use a lot of 3325As in the lab at JPL (they used to have dozens of them at
the deep space network, so there are lots of them around). Some have the rear
panel option that puts out a sine wave up to 60MHz, which is fairly convenient.
The settability with lots o' digits is nice (that's why they
How accurate?
What frequency range?
What spectral performance (harmonics, spurs)?
One thing to watch out for on testing with very low level signals is leakage
out of the signal generator and into the unit under test via a path other than
the coax. When we test deep space transponders at work at
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of gandal...@aol.com
> Sent: Tuesday, June 16, 2009 5:20 PM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Thunderbolt stability and ambient temperature
>
>
> In a message dated
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
> Sent: Tuesday, June 16, 2009 3:05 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Thunderbolt stability and ambient tempera
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of J. Forster
> Sent: Monday, June 15, 2009 2:34 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Lifetime of glass containers
>
> Interestingly
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Dave Carlson
> Sent: Monday, June 15, 2009 12:57 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Lifetime of glass containers
>
> Not to char
On 6/13/09 10:16 AM, "Thomas A. Frank" wrote:
>>> I just don't know what to say to that! Even a child can put a
>>> case of bottled water in a box, and not have it evaporate or leak.
>>> I would venture that said case of bottled water will still be full
>>> up when the child graduates from co
Vintage port is more traditional substance...
-Original Message-
From: "Chuck Harris"
To: "Discussion of precise time and frequency measurement"
Sent: 6/10/09 16:45
Subject: Re: [time-nuts] Thunderbolt stability and ambient temperature
Joseph M Gwinn wrote:
...
>> Yes, but water is so
>
> I read somewhere the suggestion to take the cast iron block
> from an old automobile engine and put it in a heavy insulated
> wooden cabinet: ~250 Kg of iron in an insulated box. Cracked
> blocks are useless in an engine, and so are available in
> junkyards quite cheap.
>
> Joe Gwinn
>
On 6/10/09 1:15 AM, "Magnus Danielson" wrote:
>
>
> Nobody having a thermal inductive material around? That would be very
> usefull to handle temperature shifts.
Let's see.. If heat flow (watts) is the analog of current (Amps), and delta
T is the analog of voltage, what would a thermal induc
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Rex Moncur
> Sent: Tuesday, June 02, 2009 3:06 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Sound Cards for locking to GPSDO 10
> MHz re
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
> Sent: Tuesday, June 02, 2009 10:08 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Sound Cards for locking to GPSDO 10
> M
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Rex Moncur
> Sent: Monday, June 01, 2009 3:00 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: [time-nuts] Sound Cards for locking to GPSDO 10 MHz
> refere
Symmetricom bc635pci-V2 or -U? PCI-SG 2U
(some of the old TrueTime products, I'm sure)
It does IRIG... You'll have to call Symmetricom to see about drivers.. It has
Win, Linux, and Solaris.
On 5/27/09 7:26 PM, "Joe Gwinn" wrote:
Does anybody know of any PCI cards that will receive IRIG-B tim
I think you're talking about the VITC, which is on lines 19 and 20 (so you
get it on both fields with interlacing). VITC carries
hour/minute/second/frame (same as LTC), but I don't know if it's "program
time" (since start of program) or "real time).
There's a bunch of flavors of vertical interv
On 5/25/09 9:52 AM, "Bill Hawkins" wrote:
> Aficionados of accurate time,
>
> I have two Panasonic DVD TV recorders, a DMR-EZ27 and 28. They were set to
> automatically sync time to a TV station. This worked fine until a few months
> ago. Now they are on manual time, but, of course, they drif
On 5/24/09 11:13 AM, "Hal Murray" wrote:
>
>
>> Also, someone I was discussing this with at work reminded me of a
>> common problem. We often run tests in a testbed where we need to have
>> the entire testbed running at some time *not the actual time*.. E.g.
>> If you're simulating a Mars e
On 5/24/09 8:32 AM, "Bob Paddock" wrote:
>> A 33.31 format would buy us a century, still allow us to get
>> nanoseconds right, but it be computationally inconvenient and
>> looks messy, so people balk at it.
>
> Anything wrong with TAI64NA?
>
> http://cr.yp.to/libtai.html
>
> "libtai is a l
On 5/22/09 10:39 AM, "Rick Karlquist" wrote:
Considering
Other than that, there is really no way a transformer can
> fail. Another thing is that if any fan were used, it would raise
> the issue of microphonics in the 10811 oscillator, which is a serious
> issue in the 8662A signal generato
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Richard
> (Rick) Karlquist
> Sent: Thursday, May 21, 2009 9:26 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 5070B once more (actually
On 5/20/09 9:18 AM, "Roy Phillips" wrote:
> Mark
> Thanks for your comments. I suspect that there was a period when the "Papst"
> fan was the de facto standard in many equipments, it has considerable depth
> and obviously moves a lot of air.
There is no real correlation between noise level an
On 5/19/09 1:15 PM, "Russell Rezaian" wrote:
> At 12:58 PM -0700 2009/05/19, Hal Murray wrote:
>> USB has a bad reputation, but I think it's way way overblown. Yes, it's
>> polled, but that polling is done in hardware and the time scale is 1 ms. If
>> you are satisfied with an accuracy of a
On 5/18/09 6:18 AM, "Lux, James P" wrote:
>
>
>
>
> On 5/18/09 1:12 AM, "Hal Murray" wrote:
>
>>
>>
>> stanley_reyno...@yahoo.com said:
>>> I need to go back and read what you are trying to measure with your
>>>
On 5/18/09 1:12 AM, "Hal Murray" wrote:
>
>
> stanley_reyno...@yahoo.com said:
>> I need to go back and read what you are trying to measure with your
>> clock. Is it internal to the computer or an external event ?
>
> I was thinking of a FPGA on a PCI bus. It has to be PCI rather than USB
On 5/17/09 9:24 AM, "Hal Murray" wrote:
>
>
>> In which case, if you're saddled with 32 bit (or 8 bit!) reads, you
>> have to do multiple reads, so that by the end of the process, you can
>> assure yourself it's consistent.
>
>> E.g read high, read low, read high, read low So you can check
On 5/16/09 10:00 PM, "Poul-Henning Kamp" wrote:
> In message <20090517031525.292e7b...@ip-64-139-1-69.sjc.megapath.net>, Hal
> Murr
> ay writes:
>
>> This is one of the reasons why I was looking for a low-cost FPGA on PCI board
>> with some way to get a couple of external inputs.
>>
>> Thing
On 5/16/09 4:32 PM, "Chuck Harris" wrote:
> Lux, James P wrote:
>
>>> I don't believe that will be happening in a message passing microkernel
>>> (like minix) anytime soon... unless you build all of the timekeeping
>>> software into the ker
On 5/16/09 4:30 PM, "Chuck Harris" wrote:
> Lux, James P wrote:
>
>>
>> I think there is more use of microkernels (eCos, RTEMS, Erlang, etc.) in the
>> embedded world. The environment is more constrained, so reducing the
>> footprint is useful.
&g
On 5/16/09 1:43 PM, "Chuck Harris" wrote:
> Poul-Henning Kamp wrote:
>
>> I have no idea how the timing code is in minix3, but I do know
>> how much time it took me and subsequently Warner to get it right
>> and good in FreeBSD.
>
> Given that minix was written by a CS professor who has no
On 5/16/09 8:04 AM, "Chuck Harris" wrote:
> Bob Paddock wrote:
>> On Sat, May 16, 2009 at 9:21 AM, Chuck Harris wrote:
>
>>
>>> Why do you think Minix-III would be a good candidate for a time server?
>>
>> Minix-III is based on the microkernel approach of keeping things small and
>> fast.
>
On 5/10/09 4:26 PM, "Magnus Danielson" wrote:
> Lux, James P skrev:
>>
>>
>> On 5/10/09 12:15 PM, "Brooke Clarke" wrote:
>>
>>> Hi James:
>>>
>>> You might want to get a KIWI-OSD, Video overlay of GPS precision tim
On 5/10/09 12:15 PM, "Brooke Clarke" wrote:
> Hi James:
>
> You might want to get a KIWI-OSD, Video overlay of GPS precision time
> stamp. It adds HH:MM:SS FF at the bottom of the image and
> so can be seen in every field. They have also developed a way to
> calibrate the came
On 5/10/09 12:10 PM, "Hal Murray" wrote:
>
>
>> As a model for what they're trying to do, say you were going to
>> measure the acceleration due to gravity by videotaping a falling
>> object against a scale in the background. Except that the motion is
>> more complex.. Maybe imagine putting a
On 5/10/09 11:21 AM, "Magnus Danielson" wrote:
> Lux, James P skrev:
>> I'm looking for a way to take GPS time and generate a signal that can
>> be recorded on the audio track of a video recording to time stamp it.
>> This is so it can be aligned with
I'm looking for a way to take GPS time and generate a signal that can be
recorded on the audio track of a video recording to time stamp it. This is so
it can be aligned with other data that's collected with GPS based time. It
needs to be portable/small (i.e. Something you could attach to a smal
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths
> Sent: Thursday, April 02, 2009 3:00 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Frequency Divider
>
> Hal Murray wrot
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Bruce Griffiths
> Sent: Thursday, April 02, 2009 2:53 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Frequency Divider
>
> Hal Murray wrote:
Try http://www.dtic.mil/ rather than NTIS.
James Lux, P.E.
Task Manager, SOMD Software Defined Radios
Flight Communications Systems Section
Jet Propulsion Laboratory
4800 Oak Grove Drive, Mail Stop 161-213
Pasadena, CA, 91109
+1(818)354-2075 phone
+1(818)393-6875 fax
> -Original Message--
> Ah, stakeholders, what's the definition of a stakeholder?
The dead vampire.
>
> Like you say, can I sign up for, and then only pay for, the
> bronze standard, if that is all I really need?
>
I believe Galileo has a "pay for performance" model as part of their
public/private partnership.
>
> I see that jargon and a combination of business and space
> 'speak' is still something that goes on.
>
> For instance is "a unified Delta II and GPS team that
> sustained a laser focus on mission success" just two groups
> who worked together to make sure that the 'stuff' worked?
A mana
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
> Sent: Wednesday, March 18, 2009 4:11 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] French Time offset
>
> Actually, there this paper:
>
> http://www.ucolick.org/~sla/leapsecs/seago.pdf
>
> says that the delta was 9 minutes and 20 seconds (see page
> 10) Historic Universal Time (GMT) in France.
>
> Warner
>
9 min 20 sec = 9.333 mins = 0.155 hours = 2.33 degrees of longitude = 2 deg 20
min l
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Michael Sokolov
> Sent: Wednesday, March 18, 2009 10:56 AM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] French Time offset
>
> "Lux, James
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Jean-Louis Oneto
> Sent: Wednesday, March 18, 2009 10:14 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] French Time offset
>
> BIPM is an _i
On 3/17/09 10:35 PM, "Rich and Marcia Putz" wrote:
> Thanks John, yes I'm real.
> The 1978 date is correct, I'm looking for the article to quote. Prior to the
> decree, France maintained a roughly twelve and a half minute offset. I always
> was struck by this as the BIPM is located in France,
mechanical watch.
>
> Ralph
>
> On Tue, March 17, 2009 9:06 am, Lux, James P wrote:
> > The latter is probably because air traffic control is
> basically done
> > at a resolution of 1 minute (e.g. "Hold at SADLE
> intersection, expect
> > release at 32[minu
On 3/17/09 5:58 AM, "Arnold Tibus" wrote:
> Interesting facts:
> The GPS navigation system has GPS Time as its basis. Galileo
> will have TAI as its basis. GLONASS has UTC as its basis,
> Air traffic controllers are using UTC.
>
The latter is probably because air traffic control is basically
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Bill Hawkins
> Sent: Monday, March 16, 2009 4:33 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Loran-C & French Clocks
>
> According to
On 3/15/09 2:46 PM, "Thomas A. Frank" wrote:
> Time to shrink the atomic clock
>
> 14 March 2009 by Anil Ananthaswamy
> Magazine issue 2699. Subscribe and get 4 free issues.
> ATOMIC clocks, currently the size of fridges, could shrink to the
> microscale thanks to a new way of measuring the s
6:47 PM, "Don Latham" wrote:
> Best isolation is via a piece of fiber optics.
> Don
>
> Bruce Griffiths
>> Lux, James P wrote:
>>>> Actually, it depends on the distance from the hot carrier, the
>>>> amplitude
>>>> of the hot carrie
>
>
> Actually, it depends on the distance from the hot carrier, the amplitude
> of the hot carrier and the particular VNA in question. My VNA allows me
> to change filters as well as integration time.
And especially, where is the selectivity in the VNA's receiver? You might
have a 10 Hz filte
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Steve Rooke
> Sent: Wednesday, March 04, 2009 5:44 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] GPS disciplined mechanical clocks
>
> 2009
A professor of what? Medieval literature
Well, you never know
-Original Message-
From: "Jim Palfreyman"
To: "Discussion of precise time and frequency measurement"
Sent: 3/4/09 04:38
Subject: [time-nuts] Big bang theory
Has anyone here watched Big Bang Theory?
I think it's one of t
On 2/21/09 5:20 PM, "Bruce Griffiths" wrote:
> Tom Van Baak wrote:
>>> For observations at 1420MHz, and short integration times (~ 100sec) the
>>> phase error needs to be 100ps or less.
>>> For longer integration times (10,000 sec is desirable) and higher
>>> frequencies the timing constraints
On 2/17/09 2:38 AM, "Neville Michie" wrote:
> Hi Jim,
> you may have a problem similar to mine.
> In Sydney, with a nominal supply voltage of 240 Volts,
> the supply at my place is above 250 volts. The supply authority
> says that is in the limits of their specification.
Typically, limits are
On 1/29/09 5:13 PM, "Magnus Danielson" wrote:
> M. Warner Losh skrev:
>> In message: <25630a120901291622l5cc165ecna06e01cc3de52...@mail.gmail.com>
>> michael taylor writes:
>> : An academic maverick is challenging conventional wisdom on Canada's
>> : prehistory by claiming an arch
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Esa Heikkinen
> Sent: Tuesday, January 27, 2009 2:46 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Home made GPS disciplined atomic clock
>
>
On 1/16/09 12:34 PM, "M. Warner Losh" wrote:
> But what about the Beryllium Sphere? What happens when you activate
> that?
>
> Warner
>
The sphere merely provides the power for the Omega 13. That's what gets
activated.
And now that you mention such things, the Omega 13 has effects that would
More realistically, the dangeris dust when something is physically overstressed
(dropped, mounting overtightened, thermal shock). That, and if it gets ground
up in trash disposal... Say someone throws it in the shredder.
-Original Message-
From: "Mike S"
To: "Discussion of precise time
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van Baak
> Sent: Wednesday, January 14, 2009 12:58 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] WWV / WWVH / WWVB
>
> > Kind of a shame
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray
> Sent: Tuesday, January 13, 2009 3:24 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Sound cards
>
>
>
> I haven't worked with plastic fibers. I'd expect the
1 - 100 of 204 matches
Mail list logo
