On Wed, Feb 22, 2012 at 11:26 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
20m of extra fiber sounds *much* more plausible.
Inventing an excuse about a loose connector to cover up the mistake
sounds even more plausible.
You really don't want to defend your phd dissertation, being known
Hi Javier,
On 02/23/2012 09:42 AM, Javier Serrano wrote:
So please stay tuned for proper information. That's all I can say for now.
Which is more or less all you should say. I agree fully with you.
From a scientific point of view, all we have heard is indications, but
it needs to be
If and only if you want to reduce the SNR substantially.
A typical glass fibre will capture insufficient light to be useful
compared to the standard arrangement using a photocell.
Plastic fibres are not usable as the temperature in the vicinity of the
absorption cell is too high.
Bruce
Tom
The ion pump current at 0 is not good. At work they bought an FTS4065B
without telling me before: instead of a very old FTS4065, there is an
already working PRS50. Anyway if the ion currect is 0 check the HV
generator first. Check this http://www.ke5fx.com/cs.htm on how to try to
reactivate the
I have found the official CERN director's words: (from Marco URLs)
Ecco l’annuncio del Direttore del CERN:
The OPERA collaboration has informed its funding agencies and host
laboratories that it has identified two possible effects that could have an
influence on its neutrino timing measurement.
The Ion Pump I is measured as a voltage across a resistor in the +3500 VDC
supply in the return path from ground. This supply is capable of providing
only a small amount of current and will collapse to zero volts if
overloaded. Likewise, it can fail for a number of reasons, due primarily to
it's
Just for completeliness I was pointed to this information:
http://www.nature.com/news/flaws-found-in-faster-than-light-neutrino-measurement-1.10099
Arnold
Am 23.02.2012 12:21, schrieb Azelio Boriani:
I have found the official CERN director's words: (from Marco URLs)
Ecco l’annuncio del
Yes, this doesn't mean the results are necessarily wrong but only
questionable. Too bad we have to wait until May to know the damage
extension on the observed results. Here in Italy, unfortunately and as
usual, the announcement was distorted by our media today: now Einstein is
the winner as much
Thanks Azelio,
so let's wait for domani ;-) ,
Arnold
Am 23.02.2012 15:12, schrieb Azelio Boriani:
Yes, this doesn't mean the results are necessarily wrong but only
questionable. Too bad we have to wait until May to know the damage
extension on the observed results. Here in Italy,
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the leader of the team that
performed the Opera experiment.
He told me that
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the leader of the team that
Am 23.02.2012 15:24, schrieb Alberto di Bene:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the leader of the team that
I recommend the differential pair: here the trigger have to sense the
crossing of the two signals and this crossing is well definite.
On Thu, Feb 23, 2012 at 3:36 PM, Jim Lux jim...@earthlink.net wrote:
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp
On 02/23/2012 03:36 PM, Jim Lux wrote:
On 2/23/12 6:24 AM, Alberto di Bene wrote:
On 2/23/2012 1:04 AM, Poul-Henning Kamp wrote:
I simply don't buy the story that tightening the connector makes
a consistent 60 nanoseconds difference on a signal.
I spoke with a physicist of Cern, friend of the
And by using a differential pair is like halving the rise time: when one
arm rises the other falls, effectively doubling the speed of the crossing
and the sharpening of the trigger event. Sort of auto_ schmitt_trigger...
On Thu, Feb 23, 2012 at 3:45 PM, Azelio Boriani
To square a sine 10MHz you can use a 4:1 transformer with the center tap:
connect the tap to GND and use a differential line receiver (ADM485,
MAX485) connected to the differential signal that comes out from the
transformer. The input of the transformer receives the single ended sine
10MHz.
On
Thanks for your insights Bruce, I think I worded my thoughts badly. The fiber
would be in addition to, not replacing the photocell. It would feed a CCD for
display purposes only, although perhaps in the future if the concerns you
brought up were addressed the CCD could also act as photocel.
A transformer or differential signaling would also have the virtue of
allowing easy galvanic isolation to prevent ground loops.
Fiber optic and line receivers often set their switching threshold
using a positive and negative peak detector. The same design works
very well for analog peak to peak
Hi
Back in the long ago, processing was expensive. Much of what we do goes back
to that era and paradigm.
A bidirectional loop with smarts on both ends would make a lot of sense
today. Spend $5 on each end and you can be sure of what's going on. Yell to
higher authority if something didn't look
On Wed, 22 Feb 2012 23:26:09 +0100, Achim Vollhardt wrote:
Fellow Time-Nuts,
I am trying to run LH on an Alix 3D3 single-board PC:
http://www.pcengines.ch/alix3d3.htm
Being only a 500 MHz Geode CPU, there is not much power to work with.
Still, running Debian Linux with Wine allowed me to
Update.. The unit has been running continuously since my last test. I
collected approx 10 hours of data last night and the Adev is slightly better
now. (Approx 1.5 thru 2.0 E-12 from 100 thru 400 seconds. At 2,000 seconds
the Adev is approx 2.6E-12)
I also noticed that the unit is
A possible mechanism occurs to me. High-precision GPS is very vulnerable
to multipath errors. A loos connector will have a significant reflection.
The reflected energy will propagate backwards, and be reflected off the
transmitter output discontinuity, the twice-reflected energy propagating
It is hard to believe that they would go public with such earth shaking results
based on a single GPS timebase, but I have found it is easy to focus on the
test head and neglect the back end of an experiment. I must also admit it is
even worse science for someone sitting in Boulder Co like
I'm sure are all aware that in the general perceptions of the world, there
are great scientific achievements and disastrous engineering failures. Never
the other way around.
Yeah, I'm an engineer.
Tom Holmes, N8ZM
Tipp City, OH
EM79
-Original Message-
From: time-nuts-boun...@febo.com
I'm looking at Item: 300658066641 on EBay, and wanted to know if anyone in
the group had any experience of this product. I know this is way off topic,
but as a group it's nice to know what's out there and possibly useful in our
mutual hobby.
Thanks for reading.
Rob Kimberley
Two things that jumps out is they have the schematic on the listing and the
price.
Thomas Knox
From: robkimber...@btinternet.com
To: time-nuts@febo.com
Date: Thu, 23 Feb 2012 20:01:18 +
Subject: [time-nuts] OT - Portable Digital 'scope
I'm looking at Item: 300658066641 on EBay,
Lots of info here http://www.seeedstudio.com/forum/index.php
On 23.02.2012 14:01, Rob Kimberley wrote:
I'm looking at Item: 300658066641 on EBay, and wanted to know if
anyone in
the group had any experience of this product. I know this is way off
topic,
but as a group it's nice to know what's
Looks interesting, but...
1) The probe connectors are not the usual BNC. Are they anything common?
2) No mating cables or connectors provided for channels 3,4, and function
generator output.
3) Function generator output will have significant DC bias and no anti-aliasing.
4) Does not appear to be
Hi
It looks like the connectors are MCX. It's a normal / low cost 50 ohm coax
connector. You see them on some GPSDO's.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Robert LaJeunesse
Sent: Thursday, February 23, 2012 3:32 PM
On 2/23/2012 12:32 PM, Robert LaJeunesse wrote:
Looks interesting, but...
1) The probe connectors are not the usual BNC. Are they anything common?
2) No mating cables or connectors provided for channels 3,4, and function
generator output.
3) Function generator output will have significant DC
On Thu, 23 Feb 2012 20:01:18 -
Rob Kimberley robkimber...@btinternet.com wrote:
I'm looking at Item: 300658066641 on EBay, and wanted to know if anyone in
the group had any experience of this product. I know this is way off topic,
but as a group it's nice to know what's out there and
This setup makes me able to connect LH from any machine to a TB.
But only one active connection is allowed at a time.
So in practice i'm running the 2 x LH against the TB's on the mail-server.
And VNC to the mailserver if i want to see the LH's.
If you use server.exe running on a PC
Hi
...bring up server.exe on a NET4501 running off a cheap flash card.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Miles
Sent: Thursday, February 23, 2012 3:55 PM
To: 'Discussion of precise time and frequency measurement'
FWIW Rigol pushes their 40MHz Analog Devices part to 100 MHz without any
problem
(seen in eevblog teardown). Yes it's sort of cheating, but if the part works
fine because all of the suppliers parts now yeild that fast due to an improved
process well, it saves a few dollars / quid / drachma...
Yes, in my opinion the connectors are MCX and I totally agree with Attila
about the 20MHz limit. Nice toy to just take a look at low speed signals,
for example GPSDOs 10MHz and PPS, serial lines and so on.
On Thu, Feb 23, 2012 at 9:49 PM, Attila Kinali att...@kinali.ch wrote:
On Thu, 23 Feb
On Thu, 23 Feb 2012 12:55:22 -0800, John Miles wrote:
If you use server.exe running on a PC motherboard (or port it to an
embedded controller of some sort), you can log on to the Thunderbolt and
control it from up to 8 different clients. Depending on what the
serial-to-Ethernet converter
A possible mechanism occurs to me. High-precision GPS is very vulnerable
to multipath errors. A loos connector will have a significant reflection.
The reflected energy will propagate backwards, and be reflected off the
transmitter output discontinuity, the twice-reflected energy propagating
On 2/23/12 1:25 PM, Robert LaJeunesse wrote:
FWIW Rigol pushes their 40MHz Analog Devices part to 100 MHz without any problem
(seen in eevblog teardown). Yes it's sort of cheating, but if the part works
fine because all of the suppliers parts now yeild that fast due to an improved
process well,
Björn,
time-nuts-boun...@febo.com wrote on 02/23/2012 04:53:06 PM:
From: b...@lysator.liu.se
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Date: 02/23/2012 04:53 PM
Subject: Re: [time-nuts] Neutrinos not so fast? (defectove connector)
Sent by:
For what it's worth:
The DSO203 is good to about 1 MHz to 2 MHz, after that signals get very
rounded. This is caused by the analog path, not by the digital sample rate.
http://forums.parallax.com/showthread.php?127201-New-%28DSO203%29-portable-oscilloscope!/page2
---Original
Actually, undersampling does use the alias effect to bring down the RF
carrier. That is, the direct sampling radio concept cannot avoid the
aliasing: it is exploited to avoid, for example, to sample a 2GHz carrier
modulated with a 20MHz signal with a 4Gsample/second ADC (by the way, does
it
On Thu, Feb 23, 2012 at 2:22 PM, Azelio Boriani azelio.bori...@screen.itwrote:
Actually, undersampling does use the alias effect to bring down the RF
carrier. That is, the direct sampling radio concept cannot avoid the
aliasing: it is exploited to avoid, for example, to sample a 2GHz carrier
On 2/23/12 2:22 PM, Azelio Boriani wrote:
Actually, undersampling does use the alias effect to bring down the RF
carrier. That is, the direct sampling radio concept cannot avoid the
aliasing: it is exploited to avoid, for example, to sample a 2GHz carrier
modulated with a 20MHz signal with a
Sampling oscilloscopes and digital storage oscilloscopes that support
equivalent time sampling do this very thing. My Tektronix 2230 with a
20 MS/sec flash converter has a bandwidth of 100 MHz and a 2 GS/sec
equivalent time sampling rate. A 7854 with a 500 kS/sec sampler (at
10 or 11 bits) and
Actually, undersampling does use the alias effect to bring down the RF
carrier. That is, the direct sampling radio concept cannot avoid the
aliasing: it is exploited to avoid, for example, to sample a 2GHz carrier
modulated with a 20MHz signal with a 4Gsample/second ADC (by the way, does
it
I own one of these that I bought directly from Seeed Studios. Seeed also
sells some very inexpensive MCX-BNC females for use with these as well
as 1x-10x probes with mcx connectors. I have had their single channel
version (DSO Nano) for a while and have found it handy. The DSO Quad has
a
I still haven't seen the source of LH or serial.exe , any hints ?
server.cpp and the rest of the Heather sources are in the same directory as
the .exe, normally c:\program files\heather or c:\program files
(x86)\heather. (You basically end up with a copy of my development
directory in that
Switched gain stages mean the bandwidth and transient response before
the ADC is going to change with different sensitivities unless both
are significantly limited which apparently is the case.
How do modern DSOs handle that? I guess it would explain why I have
been told their front end
If the bandwidth is really limited to 2 MHz, that is a rise and fall
time of 175ns. Some of those PPS signals are barely wider than that.
On Thu, 23 Feb 2012 22:26:47 +0100, Azelio Boriani
azelio.bori...@screen.it wrote:
Yes, in my opinion the connectors are MCX and I totally agree with Attila
On Thu, 23 Feb 2012 17:53:49 -0600
David davidwh...@gmail.com wrote:
How do modern DSOs handle that? I guess it would explain why I have
been told their front end calibration is so arduous. If you lose the
calibration constants somehow, you might as well throw the
oscilloscope away. Do any
What do people use these days for schematic capture (and just possibly PCB
layout), for low-budget homebrew stuff? It's been so long since I did this, I
still own a T-square and a pile of contemporary relics like rules and triangles.
I'll get out my pencil sharpener if I have to. But really,
Jim...
There is a free package called Eagleware that you might find suitable. Or
maybe it is just Eagle; it's been a while.
A little quality time with Google should find it for you easily. It is for
Windows, but there might be a Mac version as well.
Tom Holmes, N8ZM
Tipp City, OH
EM79
Nowadays you can simply download the design software for free from the fab
houses.
Try PCB 123 from sunstone.com
Good shop, reasonable prices for quick protos.
bye,
Said
In a message dated 2/23/2012 16:39:12 Pacific Standard Time, j...@jxh.com
writes:
What do people use these days
Eagle all the way. It's free and the documentation is good enough to
get you by. There is a huge hobbiest following as well if you get
stuck. Definitely read the tutorial on creating parts. It'll be
nearly impossible to wing.
The free version has some limits. 80mmx100mm boards, 2 layers, and
On Thu, Feb 23, 2012 at 4:38 PM, Jim Hickstein j...@jxh.com wrote:
What do people use these days for schematic capture (and just possibly PCB
layout), for low-budget homebrew stuff?
Eagle is popular. It is a commercial product but there is a free
version that limits you to smallish PCBs. If
Ops, yes, 2MHz is a little narrow. 20MHz is better...
On Fri, Feb 24, 2012 at 1:28 AM, Attila Kinali att...@kinali.ch wrote:
On Thu, 23 Feb 2012 17:53:49 -0600
David davidwh...@gmail.com wrote:
How do modern DSOs handle that? I guess it would explain why I have
been told their front end
On Thu, Feb 23, 2012 at 4:46 PM, saidj...@aol.com wrote:
Nowadays you can simply download the design software for free from the fab
houses.
Yes, but in many cases these have problems like (1) They save the
design in a format that forces to to use ONLY that fab house to make
the PCB. You
Thanks to Ignacio (EB4APL) and the generosity of Mike Harrison, today I
received a PCB of a disassembled FE5680A.
I provided to make some scans of the board at 2400DPI resolution: the
picture size is about 7700x11500 pixel (9MB)
Top face (with and without ICs):
There are a bunch of choices, some free and some limited to working with
a certain PCB shop, but I like Eagle (http://www.cadsoftusa.com)
because, among other things, it's cross-platform running on Windows,
Mac, and Linux (I use the Linux version). There's a free version and a
couple of steps
DesignSpark PCB: http://www.designspark.com/knowledge/pcb
Being free and having no limitations like Eagle, I think you can try it...
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Amazing teamwork and effort.
Thanks for your hard work.
Regards
Paul
On Thu, Feb 23, 2012 at 8:02 PM, Elio Corbolante elio...@gmail.com wrote:
Thanks to Ignacio (EB4APL) and the generosity of Mike Harrison, today I
received a PCB of a disassembled FE5680A.
I provided to make some scans of the
On Thu, Feb 23, 2012 at 5:09 PM, Elio Corbolante elio...@gmail.com wrote:
DesignSpark PCB: http://www.designspark.com/knowledge/pcb
Being free and having no limitations like Eagle
This looks interesting but the download is a .exe file for Windows
Does anyone know if it works with Wine? Yes I
Jim Hickstein wrote:
What do people use these days for schematic capture (and just possibly PCB
worse, I prefer ANSI logic symbology over shovels-and-spades (or, really,
over
plain rectangles where you're expected to know what the part number
means).
I'll add another vote for Eagle. It is
Hi,
Comments on their downloads page indicate that it runs under Wine. I havent
tried it though.
Cheers.
On Thursday, February 23, 2012 05:18:06 PM Chris Albertson wrote:
On Thu, Feb 23, 2012 at 5:09 PM, Elio Corbolante elio...@gmail.com wrote:
DesignSpark PCB:
Hello to the group.
I have to agree with Joe on the addiction. I was the one asking strange
questions about 8 months ago as I glued together the Frankenstein of 5061s.
It used a tube that was given to me by a fellow time-nut that was bad that
however actually had a few more fumes of CS then my 004
Good eve,
I must be the exception... I've tried Eagle, most recently about three
months back. I can't stand it. I find it, for my purposes, to be about as
intuitive as a Salvador Dali painting.
I've not yet tried DesignSpark, but it looks very promising.
Personally, I
I favor ExpressPCs free schematic generation and board layout
But Now I have a whole new list to go looking for.
More time-nuts trouble ahead.
Regards
Paul
On Thu, Feb 23, 2012 at 8:36 PM, Bruce Lane kyr...@bluefeathertech.comwrote:
Good eve,
I must be the exception... I've tried
Bruce,
You are not alone. After 20 years of OrCAD, currently using 9.1, I agree
completely. Eagle just seemed...weird. (I should add that I'm a RPN calculator
fan - where one chooses data before selecting the operator.)
That said, I will probably learn to use Eagle, as that seems to be the
I mostly use Target3001:
http://server.ibfriedrich.com/wiki/ibfwikien/index.php?title=Main_Page
It's commercial, but there are six different editions starting as low as
59€, with digital+analog, schematics, PCB, autorouting, simulation, it's
multilingual (German/English/French), and there is
Jim Hickstein said the following on 02/23/2012 07:38 PM:
What do people use these days for schematic capture (and just possibly
PCB layout), for low-budget homebrew stuff? It's been so long since I
did this, I still own a T-square and a pile of contemporary relics like
rules and
I'll add another vote for Eagle. It is a German program written in
Unix, and ported to Windows. Therefore, you select the action
first then click on the object of the action. It takes some getting
used to. There has been a pattern of PC layout companies getting
cobbled up leaving you with
I used Eagle for years, but can't say I really warmed to it. I recently
changed to DipTrace. Their pricing model seems to work better for
me (large but sparse boards in Eagle require $$$ license) as it's based
on pin count, not board size.
It's really hard to quantify usability, but I no
In case you haven't already had enough suggestions: KiCad is an open-source
option. It is much less popular/well known than Eagle, but it is free, has no*
limitations on layers, parts, or board size. Runs on Linux and Windows. All
design files are in plain text format, hence easy to parse by
On Thu, 23 Feb 2012 15:50:00 -0800, John Miles wrote:
I still haven't seen the source of LH or serial.exe , any hints ?
server.cpp and the rest of the Heather sources are in the same directory
as the .exe, normally c:\program files\heather or c:\program files
(x86)\heather. (You basically
Hi Jim, for many years (over 20) I have used protel (now altium)
autotrax- not that I am recommending it to you, but it is a very
simple and intuitive program to use and I base my opinion of all the
others on it. All the more modern ones I have tried are, for the most
part, from fairly, to
I've been using LTspice for schematic capture and simulation at
home. Will the PCB CAD tools being discussed (Eagle, DesignSpark,
FreePCB, etc.) import netlists from LTspice? Or do folks prefer to
do the schematic capture in a CAD tool and export that netlist to
LTspice for simulation?
I've also used KiCAD. The inability to do 100x160mm Eurocards on the free
version of Eagle was the killer for me. I also have a british program called
EasyPC.
Robert G8RPI.
From: beale be...@bealecorner.com
To: Discussion of precise time and frequency
On Thu, Feb 23, 2012 at 10:52 PM, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
I've been using LTspice for schematic capture and simulation at home. Will
the PCB CAD tools being discussed (Eagle, DesignSpark, FreePCB, etc.) import
netlists from LTspice? Or do folks prefer to do
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