On 27 February 2014 08:26, Hal Murray hmur...@megapathdsl.net wrote:
The advantage of something like the BBB is that it runs Linux so you have a
nice environment in which to run your code. The disadvantage of Linux is
that it's complicated and you have things like file systems that can get
On 27 Feb 2014 16:55, cheater00 . cheate...@gmail.com wrote:
If having a battery in the device makes some of you queasy, you could
always put it outside, on the back. But I seriously believe there are ways
to make battery backup which will not leak.
Two batteries, each with a diode and bought
On 27 February 2014 17:31, Chuck Harris cfhar...@erols.com wrote:
Backup batteries don't make me queasy. The easiest,
cheapest backup battery would be a small 6V 3AH sealed
lead acid battery. It is trivial to make a good float
charger using a 3 terminal regulator and a diode, and
they do
On 4 Apr 2014 08:55, Tom Knox act...@hotmail.com wrote:
90 microns is approx a freq res of about 1 x 3.66 -12
Thomas Knox
Since the Doppler shift is prortional to the frequency, I can't see how
one can determine the absolute frequency.
But given light travels at 3e8 m/s and they can
On 4 Apr 2014 23:39, saidj...@aol.com wrote:
Hello everyone,
sorry for the plug, but we just announced a new $568 complete GPSDO
reference kit.
Given the low power consumption I assume that this doesn't use an oven.
That means if it does lose GPS lock, the frequency is going to drift much
On 10 May 2014 11:01, Tom Van Baak t...@leapsecond.com wrote:
Hi Bill,
eBay has a search bar. If you type
PRS10 Rubidium
it will locate Corby's item and possibly other similar items.
I rarely use eBay's search tool now, since I found
http://www.geo-ship.com/
as it is much better at
On 20 May 2014 21:19, paul swed paulsw...@gmail.com wrote:
Boy this is really off target I guess.
To get it back on topic, if one of the options was going to be time
related, what would it be?
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To
On 28 May 2014 14:06, Tom Holmes thol...@woh.rr.com wrote:
Which begs the question: just where the heck, exactly, is the center of
the
Earth given that it is in the 'middle' of a molten and dynamic core.
I always thought that the centre was molten. There was something on the TV
in the UK a
On 2 Jun 2014 10:03, Tom Van Baak t...@leapsecond.com wrote:
Now I have never had a problem with reception in the terminal, walkway,
or even while seated inside a plane. I figured the aluminum frame of the
plane was thin enough that photons at cell, GPS, and gamma frequencies
easily pass through
On 2 Jun 2014 15:50, Attila Kinali att...@kinali.ch wrote:
I recently got introduced into the usefullness of a VNA. But these
things are horribly expensive for home use, even if bought from ebay
(before you say anything, remember i live in europe, where every
boat anchor hast to travel a long
On 2 Jun 2014 17:33, Ed Palmer ed_pal...@sasktel.net wrote:
There's a DIY project to build a spectrum analyzer at
http://scottyspectrumanalyzer.com . Since it's modular, one version of the
project is to add a couple of modules that change it into a network
analyzer.
But I think a VNA is an
On 2 Jun 2014 18:14, Thomas S. Knutsen la3...@gmail.com wrote:
The design of an VNA is an interesting thing. It requires quite high focus
on good RF practices and screening.
In the range 0-3GHz there is no low cost devices avaible, not counting the
copper mountain tech boxes (
On 2 Jun 2014 19:07, Alexander Pummer alex...@ieee.org wrote:
I do not wanted to discourage any body, but building the hardware of a
network analyzer is not a simple task, and requires substantial
instrumentation, software could solve hardware problems to certain limit
only
73
KJ6UHN
VERY
On 3 June 2014 16:54, Scott McGrath scmcgr...@gmail.com wrote:
Where are the software options for the 8753 coming from. Agilent will not
even talk about a VNA that's older than the PNA series
This has been discussed on the HP/Agilent mailing list. Basically a
couple of people that work at
On 3 June 2014 19:22, paul swed paulsw...@gmail.com wrote:
Great comment by Dave on the fact that someone
will give out some of the old options. Now I have to figure out what on
earth that might actually mean.
Regards
Paul
WB8TSL
There are a few options for those VNAs. These are basically
) Who in Australia would be best at measuring the reflection
coefficient of a 50 Ohm termination?
--
Dr. David Kirkby G8WRB
http://www.vnacalibration.co.uk/
Economical accurate VNA calibration kits.
Coefficients available for HP, Agilent, Anritsu, Rohde Schwarz and
VNWA network analyzers
On 2 Jul 2014 07:55, Magnus Danielson mag...@rubidium.dyndns.org wrote:
The authoritative source is BIPM:
http://www.bipm.org/en/practical_info/useful_links/nmi.html
Thank you. That is a useful resource to know of.
which points to:
http://www.measurement.gov.au/Pages/default.aspx
Thanks,
On 10/18/12 12:33 AM, Jim Lux wrote:
On 10/17/12 3:35 PM, David Kirkby wrote:
On 17 October 2012 20:35, Jim Lux jim...@earthlink.net wrote:
Someone found the manual I needed (see the other posts).. it was on that
general website but not linked from anywhere...
I guess you should report
they are a threat to national security!
Dave
--
Dr. David Kirkby Ph.D C.Eng MIET
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
advantages in small, compact units with a warranty, but I'd
certainly want to consider buying used professional equipment.
--
Dr. David Kirkby Ph.D C.Eng MIET
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi
David C. Partridge wrote:
No they cannot be - yet. At the point where (e.g.) the second is re-defined
in terms of the aluminium quantum clock, then the aluminium quantum clocks
are then by definition the primary standards of time, and all the Cs clocks
are now secondary standards as the second
Tom Holmes, N8ZM wrote:
My recollection of the definition of an Ampere is 6.02 x 10^23 electrons per
second (Avogadro's Number, I believe) passing a point in a conductor. To this
day, I wonder how they managed to count all those electrons. But it does
suggest that the silver deposit approach
On 07/ 3/10 10:50 PM, J. Forster wrote:
master_clocks/g-0rb/http://esoteric.teac.com/master_clocks/g-0rb/
About $15,000.
-John
Perhaps you should ask why they don't use a more accurate reference than
rubidium. Or better still, play dumb and ask them if this rubidium is the best
possible
On 07/ 4/10 08:48 AM, Steve Rooke wrote:
Maybe we are into the wrong sort of projects here, instead of knocking
together $10 testers we should get some cheap Rb units off fluke.l
and start turning out $15,000 audio equipment. Can you imagine how
much you could get for your ageing tube Cs unit in
On 07/ 5/10 02:56 AM, Steve Rooke wrote:
On 4 July 2010 23:30, Dr. David Kirkbydavid.kir...@onetel.net wrote:
Do the cheap fluke units allow locking to a 1 pps signal? If so, you could
sell a GPS locked version for even more!
You could get a Motorola M12+ from Bob for $0.01 if your lucky on
On 10/12/10 09:27 PM, WB6BNQ wrote:
OK, found it
There is one version but two choices. The first is a FREE one with limited
capability. The second is the same program but with a key to unlock all the
color and variable adjustment capabilities of the program. The WEB page shows
a number of
On 10/18/10 03:21 AM, Oz-in-DFW wrote:
I used these guys for $9:
http://www.cheapssls.com/comodo-ssl-certificates/positivessl.html
It was worth it to not have to walk people through accepting a
self-signed cert.
But the more people that fork out, the less common self-signed certificates
On 8 August 2013 04:10, Brooke Clarke bro...@pacific.net wrote:
Hi Mark:
These only ship to the UK.
Does not ship to the US
Have Fun,
Brooke Clarke
I've bought one. On the message to seller I have asked if he will
ship outside the UK.
I've had a couple of those rubidiums a few years, but
On 6 August 2013 09:37, Raj vu2...@gmail.com wrote:
Found this on Hack-a-day
http://www.youtube.com/watch?v=chrzrod3tQY
Cheers
--
Raj, VU2ZAP
Interesting video. I decided to but one of the distribution amps. I
already have the rubidium. There were a few things that struck me in
the video.
On 8 August 2013 14:49, mc235960 mc235...@gmail.com wrote:
None left from that batch. Hope you got yours.
I suspect he has a lot. He originally listed 10, and all them have
gone, so he has listed another 10
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItemitem=161082475549
Dave
On 9 August 2013 03:50, Mark Sims hol...@hotmail.com wrote:
Hi Mark,
I'm not sure why you needed to start a new thread - why not just add
to the old one?
I also use a blinking status LED controlled by an ATTINY13 AVR chip. It also
reads a temperature sensor and controls a PWM'ed fan. The
On 9 August 2013 14:09, Bob Camp li...@rtty.us wrote:
Hi
A few observations:
1) He talks about using a heat sink on the front panel, but then never shows
it / does it. The fan inside the box is not going to cool that Rb the way it
needs to be cooled. You either need a pretty massive heat
On 10 August 2013 19:59, Brooke Clarke bro...@pacific.net wrote:
Hi:
This is an interesting type of VNA where they independently change the LO
and detector DDS clocks to fill in what otherwise would be nulls thus
extending the frequency coverage. 20 minutes into the video they talk about
On 27 August 2013 16:25, Steven Kluck skluck...@yahoo.com wrote:
I am new to this group, and my main interest is time keeping/ time signal
reception, but all of this frequency talk is catching my interest.
If
I had a couple of extra cesium frequency references, I would want to
try Roland
On 27 August 2013 04:42, Raj vu2...@gmail.com wrote:
Found this on Hack-a-day
http://gerrysweeney.com/diy-hpagilent-53131a-010-high-stability-timebase-option/
Regards
--
Raj, VU2ZAP
I've noticed one seller on eBay who is selling seller refurbished
test equipment where he has put rubidiums
On 28 August 2013 17:35, cfo xne...@luna.dyndns.dk wrote:
and as the seller wrote it is fully
working , and passes self test. I was wondering if anyone could give some
hints to test that it's working ok.
I often ask sellers how something was tested. Some peoples idea of
tested is very
On 29 August 2013 01:00, Mann Weltzeit mweltz...@ymail.com wrote:
I have recovered BVA Oscillators from Telecommunications decommissioned
equipment
and these tested Oscillator Modules are offered for sale to the Time-Nuts
group.
I have two 8600-06 units with 5 MHz sinus wave output on two
On 1 October 2013 23:59, saidj...@aol.com wrote:
Guys,
there is only one problem: there is just no way they can claim only 1
second error in a 1000 years unless they also have a GPS receiver for
calibration in there, which kind of mutes the point as that has been done
using wwvb
etc.
I got sent an email about a Webinar, which is free (I like that!!!) on
next Wednesday (Oct 9th).
http://mwrf.com/webinar/webcast-phase-noise-jitter-measurements
I'm not sure how useful it will be, but might be worth a look.
Dave
___
time-nuts mailing
On 3 October 2013 02:26, Joseph Gray jg...@zianet.com wrote:
I won't be available when this is live. Do you know if the video will be
available afterwards?
Joe Gray
W5JG
Sorry, I don't know. You could ask either R+S or MWRF. I know Agilent
archive their webinars, but I've never seen one from
this evening. Its a series of flash files with a
size of 20 - 50k. They can be saved in a hurry. I could not find a audio
file, its also one of the flash files. At the end all files are gone. Its not
very practical to save it.
From: Dr. David Kirkby drkir
Some time back I needed to purchase some caps to cover RF connectors.
Despite only wanting a couple of hundred of each, I was unable to get
small quantities, so had to buy either 2500 or 5000 of each, so I have
a few to spare. If anyone wants to cover their plugs and sockets to
stop dirt and
I forgot to add. There are some pictures on eBay of these, but I'm
selling them cheaper off of eBay, but you can see the pictures with
the various connectors. (No PL259 or S0239 shown, but they do fit. I
had to hunt hard to find such connectors here)
On 17 November 2013 15:48, Tom Van Baak t...@leapsecond.com wrote:
I passed on it due to its weight and condition.
/tvb
I wonder if that is really worth more than its scrap value?
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To
On 17 November 2013 20:19, Don Latham d...@montana.com wrote:
Ridiculous price for the condition.
I do have kin in mnpls who could pick it up, but...
Don
It may well be incomplete too. It is quite possible someone has raided
it for parts.
Dave
___
On 18 November 2013 02:41, Bob Camp li...@rtty.us wrote:
I have paid a lot of money over the years for “stuff”. I’m not in any way
saying that buying “stuff” is a bad idea. If you could make it work, that’s
certainly neat stuff. My only issue here is - what’s this going to do for
somebody?
want anyone else to
waste their time. I will upload a better version later.
--
Dr. David Kirkby G8WRB
http://www.vnacalibration.co.uk/
Economical accurate VNA calibration kits.
Coefficients available for HP, Agilent, Anritsu, Rohde Schwarz and
VNWA network analyzers
On 19 November 2013 16:53, cfo xne...@luna.dyndns.dk wrote:
On Tue, 19 Nov 2013 09:35:00 -0700, Tom Knox wrote:
Amazing price, is there a gun involved?
Thomas Knox
No gun , but some previous buys from same seller.
And no options installed in the unit.
I have just been told that the
On 20 November 2013 02:35, paul swed paulsw...@gmail.com wrote:
Don
A couple of comments. I have the old ethernet 100 also. As I recall it
would only work up until windows 98 or 2000..
I don't think that is true
http://www.ni.com/download/ni-488.2-3.1.2/4360/en/
supports windows 8 and
On 5 December 2013 05:56, David J Taylor david-tay...@blueyonder.co.uk wrote:
Anyone know whether these antennas are any good? Anyone used one? I wonder
where they are made?
http://www.rfsupplier.com/timing-antenna-meter-plug-with-rg58-coax-cable-p-2344.html
Looks like it has no filter,
://www.nlsa.com/nets/moon-net-help.html
--
Dr. David Kirkby G8WRB
http://www.vnacalibration.co.uk/
Economical accurate VNA calibration kits.
Coefficients available for HP, Agilent, Anritsu, Rohde Schwarz and
VNWA network analyzers.
___
time-nuts mailing
mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
Dr. David Kirkby G8WRB
http://www.vnacalibration.co.uk/
Economical accurate VNA calibration kits.
Coefficients available for HP, Agilent, Anritsu
On 26 December 2013 01:18, Philip Pemberton li...@philpem.me.uk wrote:
Hi guys,
It seems I must have had a bit too much to drink after Christmas dinner,
as I've apparently gone crazy and bought an Efratom SLCR-101 Rubidium
frequency standard:
http://www.ebay.co.uk/itm/400624911534
I
On 26 December 2013 11:01, Philip Pemberton li...@philpem.me.uk wrote:
Then there's the customs charge (20% VAT plus a £10 handling fee). So in
most cases, buying from China is a bit of a false economy:
$75 US at ~$1.5 to £1 = £50
£50 + 20% VAT = £60
Plus the £10 handling fee = £70
On 26 December 2013 16:07, ct1dmk ct1...@gmail.com wrote:
Hello,
I'm willing to generate a pulse (of some few hundred volts)
by discharging a capacitor into a pulse transformer
There are probably more modern approaches, but a thryatron is one
possibility. Shame I put on in the dump a few
@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
Dr. David Kirkby G8WRB
http://www.vnacalibration.co.uk/
Economical accurate VNA calibration kits.
Coefficients available for HP, Agilent, Anritsu, Rohde Schwarz and
VNWA
On 6 February 2014 21:32, Jamieson (Jim) Rowe jimr...@optusnet.com.au wrote:
So I decided to test this in a crude way, by inverting the FE-5680A and
seeing what happened. And - lo and behold - it locked up within 2.5 minutes,
and stayed locked until I turned off the power and let it go cold
On the train this morning I picked up a copy of the Metro (there are usually
numerous copies on any train, as its free and does not take long to read).
There was an article about financial institutions being concerned about the time
of their clocks being purposely altered by GPS manipulation
On 03/31/12 09:38 PM, Jim Lux wrote:
On 3/31/12 1:15 PM, Brooke Clarke wrote:
Hi Achim:
SMA RF connectors have a very limited life (number of matings) until
they are worn out.
I don't think so. Yes, they're only rated for 500 cycles, but there's a
paper by a guy at Maury Microwave that I ran
On 04/ 1/12 03:33 PM, Jim Lux wrote:
On 4/1/12 3:01 AM, Dr. David Kirkby wrote:
On 03/31/12 09:38 PM, Jim Lux wrote:
I don't think so. Yes, they're only rated for 500 cycles, but there's a
paper by a guy at Maury Microwave that I ran across when trying to get
statistics on the reflection
This is not exactly a time related question, but I'm sure the subject must be of
interest to time-nuts using GPS.
If one transmits from an antenna such as a helical one, RHCP, can the same
antenna be used for reception, or does the helix need to be wound the other way?
If you google this
On 06/ 5/12 04:06 PM, Rex wrote:
I took a scan through Kraus Antennas since he did much of the
definitive work on Helical antennas. In his chapter on Wave Polarization
he gives a mathematical definition of Left- and Right-circular
polarization, then quickly mentions that the IEEE definition is
On 06/ 5/12 06:43 PM, J. Forster wrote:
IMO, the IEEE is pretty much useless for practicing engineers. It is
mostly by and for academics to build up their resumes
YMMV,
-John
I disagree with that. I find the IEEE useful as a practicing engineer. I think a
lot of companies do to. My own
On 06/ 5/12 09:23 PM, Jerry Mulchin wrote:
I joined IEEE for a while a few years ago with the hopes of being able to
access the libraries I wanted most. What a shock to find out that I had to
pay additional monies to get access to those files. So I quit the IEEE
and now I keep getting Emails
On 06/ 5/12 12:26 AM, Magnus Danielson wrote:
On 05/06/12 00:30, Dr. David Kirkby wrote:
This is not exactly a time related question, but I'm sure the subject
must be of interest to time-nuts using GPS.
If one transmits from an antenna such as a helical one, RHCP, can the
same antenna be used
On 07/ 7/12 05:43 PM, Magnus Danielson wrote:
On 07/07/2012 06:21 PM, Dr. David Kirkby wrote:
I can confirm that I'm 100% sure that the polarization of the two
antennas needs to be the same - i.e. both RHCP or both LHCP. I built two
of them for RHCP, and got appreciate gain.
Despite what
/mailman/listinfo/time-nuts
and follow the instructions there.
--
Dr. David Kirkby Ph.D C.Eng MIET
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
John May wrote:
I'm in the UK and am often frustrated when a nice piece of kit is
offered for sale on the 'bay by dealers in the US who won't ship
overseas. I've been looking for an HP 5370B and have lost out on a few
nice looking units because of this. There's one sitting there just now
Marco IK1ODO wrote:
Robert,
Some power tubesmay use it internally.
As far as I know, from many discussions with power tube
manufacturers, no power tube uses beryllia, except for that
conduction-cooled Eimac tubes. It's simply not needed.
Other tubes (not power ones) may be different, but I
Dr. David Kirkby wrote:
Marco IK1ODO wrote:
Robert,
Some power tubesmay use it internally.
As far as I know, from many discussions with power tube manufacturers,
no power tube uses beryllia, except for that conduction-cooled Eimac
tubes. It's simply not needed.
Other tubes (not power ones
Philip Pemberton wrote:
First, I have a set of original DEC OS/8 TU56 distribution tapes. I
emphasize, these are *original*, nearly pristine, DEC-labeled
distribution tapes. I've had these for nearly thirty years. 'Nuff said.
SNIP
Second, I have an Atomichron. Yes, a real one, a
J. Forster wrote:
Many years ago, when the State Lottern Numbers Game started up here, I
noticed that doubles were coming up a lot... like 4662. I was utterly
convinced they were overrepresented.
However, being cheap and sane, I decided to test the theory before
spending $$. I collected ALL
I'm on the so-called 'Economy 7' electric in the UK, where I'm supposed to get
cheap electric from 0030 to 0730 - i.e. a 7 hour period when electricity demand
is low. I'm no longer heating by electric, but do run some computers 24/7. It's
not totally clear whether this saves me money or costs
not have thought a trimmer cap going open-circuit could have induced a
2% change. That seems an awful lot.
Thanks for the idea of the ferrite rod.
Dave
--- On Mon, 28/12/09, Dr. David Kirkby david.kir...@onetel.net wrote:
From: Dr. David Kirkby david.kir...@onetel.net
Subject: [time-nuts] Can
Bruce Griffiths wrote:
If the trimmer in in series with the crystal and not shunted by another
capacitor then the crystal will no longer control the oscillator frequency.
0.1pF or 0.01pF in series with a tuning fork crystal instead of the
nominal value (20pf?) will make a singnificant
Bob Camp wrote:
Hi
Even with a tuning fork crystal, anything past about 0.2% is a very large
changel. That's true for tuning and also true for normal aging.
I suspect that something mechanical has happened.
1) A cracked crystal - unlikely
2).An electro magnet in the driving circuit no
more than usual.
Dave
--- On Mon, 28/12/09, Dr. David Kirkby david.kir...@onetel.net wrote:
From: Dr. David Kirkby david.kir...@onetel.net
Subject: Re: [time-nuts] Can a quartz crystal go off by 2% ?
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Date: Monday
the 50 Hz
supply.
Rob Kimberley
The electricity bill always states the times are approximately 0030 to 0730 GMT.
Therefore, there is no change for daylight saving.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dr. David
I know many time-nuts use FreeBSD. Is there anyone interested in devoting some
spare time to help port the GPL2 Sage maths software Sage
http://www.sagemath.org/
to FreeBSD?
There is someone else doing this (Peter, who I cc'ed this to), but I suspect
Peter's efforts are somewhat hampered by
Chuck Harris wrote:
I bought some of the LED replacements for Edison bulb incandescents, and
they have an afterglow that lasts for several minutes. It is very much
dimmer than when they are turned on, but is there none the less.
-Chuck
I got one of these so called 2D fluorescent tubes in a
Dr. David Kirkby wrote:
Chuck Harris wrote:
I bought some of the LED replacements for Edison bulb incandescents, and
they have an afterglow that lasts for several minutes. It is very much
dimmer than when they are turned on, but is there none the less.
-Chuck
I got one of these so called 2D
Max Robinson wrote:
I remember hearing about a law suit in an engineering law class I had to
take way back when. It seems a farmer had a long fence running under
and parallel to a high tension distribution line. He had hidden a
copper line in it and was harvesting enough power to operate
On Wed, 20 Apr 2005, Bill Janssen wrote:
I picked up a HP 10811A today and need the connection information.
I tried the WEB and went to the Bama site but at Bama they removed all
HP info.
Thanks
Bill K7NOM
I don't have time now, but are 99.9% sure I downloaded a manual (I'm not
sure what
are not that expensive.
5) Jitter on GPS.
6) If one needs to buy a manual on the Z3801A, that will add to its cost.
Any other thoughts
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E
by a PDF file. I don't have to pay them anything.
4) I have signed the document, returned it to Agilent by airmail, and
will await their confirmation.
Sorry I am not willing to go into further details just as this minute.
But when I have received confirmation, I will post further details.
--
Dr. David
averager (because the sawtooth does not necessairly average
out to zero in that timeinterval).
Even then, the PRS10+M12+T is by far the best bang for the
buck I can think off.
I am confused how this can be cheaper although I accept its performance
should be excellent.
--
Dr. David Kirkby PhD CEng
thoughts on that sort of idea above?
Any obvious flaws?? Apart from the fact it is getting more and more
expensive, and less and less related to the initial aim of making a
couple of hundred year old pendulum clock more accurate!!!
Dr. David Kirkby
Brooke Clarke wrote:
Hi Tom:
Don't forget that SRS has
thoughts on that sort of idea above?
Any obvious flaws?? Apart from the fact it is getting more and more
expensive, and less and less related to the initial aim of making a
couple of hundred year old pendulum clock more accurate!!!
Dr. David Kirkby
Brooke Clarke wrote:
Hi Tom:
Don't forget
Dr. David Kirkby Ph.D. CEng MIEE,
Senior Research Fellow,
Department of Medical Physics and Bioengineering,
Malet Place Engineering Building,
Gower St,
University College London,
London,
WC1E 6BT
Tel: 020 7679 0273
On Wed, 27 Apr 2005, Tom Van Baak wrote:
If I have two different
This does not seem to make sense. No matter what you are measuring it is
assumed that the phase noise of the item being measured is greater than the
piece of test equipment doing the measurement, else you would not see it.
My reason for asking this is that given I have nothing to make a phase
intention to fool anyone. Sorry if you did not mean it that
way, but I can understand a certain sense of confusion. But they are
different. I just wanted to put the record straight.
Dr. David Kirkby.
Senior Research Fellow,
Department of Medical Physics and Bioengineering,
Univeristy College London
. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E 6BT.
___
time-nuts mailing list
time-nuts@febo.com
https://www.febo.com/cgi-bin/mailman
it
commerically.
If anyone has later revision sheets, that cover later serial numbers,
let me know.
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E 6BT
runs 24/7, the PC route would have been more
expensive.
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E 6BT.
___
time-nuts
not considering myself serious, but what thinking the other day a second HP5370B would be nice.
However, I will get my pendulum clocked to a 10811A (or perhaps a Stanford PRS10) first, before
worrying about anything else.
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical
already be
doing it.
I appreciate what you are saying. I will test the seals periodically.
-Chuck
Dr. David Kirkby wrote:
For obvious rasons a frequency standard should be battery backed. I
was intending puting the batteries in the same box as my GPS/rubidium
etc, but was advised
in the calibration procedure of vector network analysers.
Application notes on their theory should be on the Agilent web site.
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E 6BT
me know off-list.
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical Physics,
Mallet Place Engineering Building,
Gower St,
University College London,
London WC1E 6BT.
___
time-nuts mailing list
time-nuts@febo.com
https
meter (10-1500MHz) in either electronic or a paper
copy they would loan me, could they let me know. I have two electronic copies, both of which have
problems - one is a very old manual and the other incomplete.
--
Dr. David Kirkby PhD CEng MIEE,
Senior Research Fellow,
Department of Medical
Agilent aware of this, but they are not sure if the problem can be
fixed or not. If I can fix it myself, I'll let them have a complete copy.
--
Dr. David Kirkby PhD CEng MIEE,
If you use Windows, there are two free programs for merging pages or
entire PDF files - PDF Blender and PDFTK
1 - 100 of 448 matches
Mail list logo
