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
-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
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-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Hal Murray
Sent: Wednesday, July 29
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
On 7/28/09 4:47 AM, J. L. Trantham jlt...@worldnet.att.net 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
-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
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
On 7/24/09 6:32 AM, Stephan Sandenbergh step...@rrsg.ee.uct.ac.za 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
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
-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
-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 EGG
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
From
-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
In message c6848687.91d9%james.p@jpl.nasa.gov, 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
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
-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 hol...@hotmail.com wrote:
My Ashtech
-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
On 7/13/09 1:59 AM, b...@lysator.liu.se 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
On 7/6/09 5:37 AM, John Ackermann N8UR j...@febo.com 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
On 7/4/09 1:49 PM, Hal Murray hmur...@megapathdsl.net 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
On 7/4/09 7:43 PM, Chad Simpson analogaficion...@gmail.com 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
On 7/4/09 8:36 PM, Robert Darlington rdarling...@gmail.com 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
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 registration
-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 play
-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 running
-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 this by any
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 m0...@veenstras.com wrote:
INMARSATS
-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
James:
I am afraid you lost me
On 6/28/09 2:59 AM, iov...@inwind.it 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,
On 6/28/09 3:23 PM, iov...@inwind.it 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
On 6/28/09 4:35 PM, Magnus Danielson mag...@rubidium.dyndns.org 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
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
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
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
On 6/19/09 6:38 AM, optoma...@rogers.com 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
-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 temperature
-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 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 charge in,
-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, I
On 6/13/09 10:16 AM, Thomas A. Frank ka2...@cox.net 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
On 6/10/09 1:15 AM, Magnus Danielson mag...@rubidium.dyndns.org 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
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
At
Vintage port is more traditional substance...
-Original Message-
From: Chuck Harris cfhar...@erols.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: 6/10/09 16:45
Subject: Re: [time-nuts] Thunderbolt stability and ambient temperature
Joseph M Gwinn
-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
MHz
-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
-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
references
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 joegw...@comcast.net wrote:
Does anybody know of any PCI cards that will
On 5/25/09 9:52 AM, Bill Hawkins b...@iaxs.net 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,
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 interval
On 5/24/09 8:32 AM, Bob Paddock bob.padd...@gmail.com 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
On 5/24/09 11:13 AM, Hal Murray hmur...@megapathdsl.net 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
On 5/22/09 10:39 AM, Rick Karlquist rich...@karlquist.com 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
-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 5370A
On 5/20/09 9:18 AM, Roy Phillips phill...@btinternet.com 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
On 5/19/09 1:15 PM, Russell Rezaian rreza...@motorola.com 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
On 5/18/09 1:12 AM, Hal Murray hmur...@megapathdsl.net 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
On 5/18/09 6:18 AM, Lux, James P james.p@jpl.nasa.gov wrote:
On 5/18/09 1:12 AM, Hal Murray hmur...@megapathdsl.net 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
On 5/16/09 10:00 PM, Poul-Henning Kamp p...@phk.freebsd.dk 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.
On 5/17/09 9:24 AM, Hal Murray hmur...@megapathdsl.net 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
On 5/16/09 8:04 AM, Chuck Harris cfhar...@erols.com wrote:
Bob Paddock wrote:
On Sat, May 16, 2009 at 9:21 AM, Chuck Harris cfhar...@erols.com 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
On 5/16/09 1:43 PM, Chuck Harris cfhar...@erols.com 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
On 5/16/09 4:30 PM, Chuck Harris cfhar...@erols.com 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.
That's just it, it doesn't reduce
On 5/16/09 4:32 PM, Chuck Harris cfhar...@erols.com 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 kernel, and then you are in the process
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
On 5/10/09 11:21 AM, Magnus Danielson mag...@rubidium.dyndns.org 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 other data that's
On 5/10/09 12:10 PM, Hal Murray hmur...@megapathdsl.net 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
On 5/10/09 12:15 PM, Brooke Clarke bro...@pacific.net 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
On 5/10/09 4:26 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
Lux, James P skrev:
On 5/10/09 12:15 PM, Brooke Clarke bro...@pacific.net wrote:
Hi James:
You might want to get a KIWI-OSD, Video overlay of GPS precision time
stamp. It adds HH:MM:SS FF
-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:
LVDS
-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 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
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 manager I
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.
For
On 3/17/09 10:35 PM, Rich and Marcia Putz rp...@bnin.net 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
-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
-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 P james.p@jpl.nasa.gov wrote
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 longitude
-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
Lux, James P skrev
On 3/17/09 5:58 AM, Arnold Tibus arnold.ti...@gmx.de 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
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[minutes after the hour]) so the several
second offset
between UTC and GPS is immaterial. You're looking
-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 ka2...@cox.net 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
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 filter,
PM, Don Latham d...@montana.com 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 carrier and the particular VNA in question. My VNA allows me
to change filters
A professor of what? Medieval literaturegrin
Well, you never know
-Original Message-
From: Jim Palfreyman jim77...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: 3/4/09 04:38
Subject: [time-nuts] Big bang theory
Has anyone here watched
-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
2009/3/5
On 2/21/09 5:20 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz 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
On 2/17/09 2:38 AM, Neville Michie namic...@gmail.com 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.
On 1/29/09 5:13 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
M. Warner Losh skrev:
In message: 25630a120901291622l5cc165ecna06e01cc3de52...@mail.gmail.com
michael taylor mct...@gmail.com writes:
: An academic maverick is challenging conventional wisdom on Canada's
:
-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
Its
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 mi...@flatsurface.com
To:
On 1/16/09 12:34 PM, M. Warner Losh i...@bsdimp.com 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
-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 they
optical media, the latter being attractive in further isolating PC
noise from any measurement setup. And of course, a manufacturer's
evaluation board is much better documented and more suited to
measurement-specific mods than a random sound card.
The optical link commonly being used for
The optical link commonly being used for S/P-DIF is TosLink and it
seems like it can be the cause of many problems. It seems like some
care in doing the optical link setup is needed. I have never digged
into why the optical links have that problem. I can only guess, but
bad optical
Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
Sent: Tuesday, January 13, 2009 3:01 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Sound cards
L
Consumer audio optical links (TOSlink)
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
Or 1553, for that matter
-Original Message-
From: David C. Partridge david.partri...@dsl.pipex.com
Get 'em to use twin-ax (twisted pair inside screen) like the IBM AS/400
terminals (5250?) send differential signal down the cable.
Dave
___
I like how you can get *Used* copies from Amazon for more than twice the brand
new price (even from the exact same seller!). Surely some sort of artifact of
the used book sellers' pricing algorithms. (or, maybe, you're paying for
someone to buy the book new, open it up, scuff the covers a
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson
Sent: Thursday, January 08, 2009 9:51 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] GPSDO time constant
Hi Brooke,
So you
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