I heard of a system used in Melbourne between two major stations using
pulses in a pipe of water to sync. I suppose that pulses travel much faster
in water being incompressible, so better accuracy!
Tom Harris <celephi...@gmail.com>
On 20 October 2015 at 07:00, Brian Inglis <
,
the webserver runs a script that generates the response, the webserver
serves it out, your browser displays it. Why bother with learning a
framework? Messing about with mechanics is far more fun!
Tom Harris celephi...@gmail.com
On 4 July 2015 at 23:13, Jim Lux jim...@earthlink.net wrote:
I've
evaporated. He also dipped people's cigarettes in liquid oxygen, this turns
them into miniature firecrackers when lit, all the more fun if they are in
someones mouth at the time! The invites had the time/date in Unix seconds
since 1970.
Tom Harris celephi...@gmail.com
On 24 June 2015 at 05:28, Esa
include typographical errors and may
be revised at any time without notice.
Wasn't the leap second publicised 6 months in advance?
Tom Harris celephi...@gmail.com
On 25 June 2015 at 02:24, David J Taylor david-tay...@blueyonder.co.uk
wrote:
From: Jim Lux
https://support.microsoft.com/en-us/kb
with multiple cigarette papers to make a gapped core.
Tom Harris celephi...@gmail.com
On 23 June 2015 at 05:02, Attila Kinali att...@kinali.ch wrote:
Hi,
I was looking up some stuff and realized (again) that I don't know
anything about how magnetic electronic components (inductors/solenoids
You have TX connected to TX? Swap your TX/RX connections and see if the
levels improve.
Tom Harris celephi...@gmail.com
On 3 June 2015 at 14:38, Dan Quigley d...@quigleys.us wrote:
Hello,
I'm integrating an Arduino (Due/Mega have tried both) with a surplus
Thunderbolt and need some advice
.
Tom Harris celephi...@gmail.com
On 11 May 2015 at 10:32, Hal Murray hmur...@megapathdsl.net wrote:
Michael Wright talking about the Antikythera
http://www.the-eg.com/videos/michael-wright-antikythera-resurrector-eg8
The video is 1/2 hour. I thought it was good. He's a colorful speaker
inside. It has quartz in big letters on the front. That dates it back to
when quartz signified quality and accuracy.
Maybe I should make an offer.
Image resize to something sensible, thanks for the nod TvB:)
Tom Harris celephi...@gmail.com
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I can open it up whatever. I shall certainly take photos. I hope that it
did not have internal nicads, as they will indeed be in a sad state after
30 years :(
Tom Harris celephi...@gmail.com
On 31 March 2015 at 01:31, paul swed paulsw...@gmail.com wrote:
You should make an offer that way we
Python has a nice library struct that can take a binary buffer of just
about anything, integers, strings, etc, with any alignment or byte ordering
and parse it to a list of values. I've never had the need to use anything
else. Perl probably has the same as well.
Tom Harris celephi...@gmail.com
The public exhibition for this conference Ships, Clocks and Stars: The
Quest for Longitude is apparently coming to the colonies (Canada
Australia) this year, so us colonials might get a chance to feast on the
Harrison timepieces in all their glory. True clock p**n.
Tom Harris celephi
What beautiful looking instruments. I bet they look just as sexy from
behind. Someone should make a coffee table book of glamour shots of old HP
gear. I'd buy a copy. Including a gatefold of a full rack, captioned Nice
rack
Tom Harris celephi...@gmail.com
On 19 March 2015 at 06:57, Poul
the right number of cycles per day. It was insensitive to
voltage. We did find that isolating the zener opto via a transformer gave
a temperature dependant phase shift, exactly what you don't want for
switching thyristors.
Tom Harris celephi...@gmail.com
On 19 December 2014 at 08:16, Charles
to the list. I have not heard of being able to
access the clock in the tower over the network.
The beauty of phone network is that it works in buildings, where GPS does
not reach.
Tom Harris celephi...@gmail.com
On 12 November 2014 01:24, Tony tn...@toneh.demon.co.uk wrote:
How accurately can you
your neighbourhood. As you go between towers you will get new NITZ updates,
and you can log the accuracy.
Try not to get arrested as a terrorist :)
There is a simplified NTP service that only receives a small packet, I
think I saw an example for Arduino.
Tom Harris celephi...@gmail.com
On 12
it was easy to perform integrations of the output over time.
Simply cut the roll along the recorded line and weigh the remainder on an
analytical balance, the ratio of the weight to an equal length of uncut
roll was the integral.
What larks!
Tom Harris celephi...@gmail.com
On 12 August 2014 04:31
Tom Harris celephi...@gmail.com
On 10 April 2014 16:35, Chris Albertson albertson.ch...@gmail.com wrote:
To many ifs and you could The Arduino is what it is. There
is no capture register, no interrupt priorities and the counter is...
There certainly is an input capture, and it makes
the delay between
the PPS and the line on a CRO set on infinite persistance, just to check if
it works.
Tom Harris celephi...@gmail.com
On 9 April 2014 13:05, Chris Albertson albertson.ch...@gmail.com wrote:
I just had some success with a new GPSDO based very much on Lars Walenius'
design
I cut his
Tom Harris celephi...@gmail.com
On 13 March 2014 01:21, Chris Albertson albertson.ch...@gmail.com wrote:
Sorry forgot to add this.
As for delayed turn on. That can work but why not simply have the software
go into a 5 or 10 second wait before it does anything else. Display
warming up
The really scary thing is that this is some sort of postgraduate thesis
project examined by a swag of learned doctors, complete with the artistic
waffle of What It All Means.
Tom Harris celephi...@gmail.com
On 24 February 2014 15:11, Daniel Mendes dmend...@gmail.com wrote
sense.
Tom Harris celephi...@gmail.com
On 7 February 2014 08:32, Jamieson (Jim) Rowe jimr...@optusnet.com.auwrote:
Hi again folks,
You may (or may not) recall that a month or so ago, I asked for any
information that might be available regarding how to fix a 'used' FE-5680A
rubidium module
field?
Tom Harris celephi...@gmail.com
On 6 February 2014 04:39, Hal Murray hmur...@megapathdsl.net wrote:
jimmydb...@gmail.com said:
Interesting.. I'm assuming the green graph is actual voltage and the red
graph is..?
The green is the frequency as measured over the last 10 seconds
deg :)
Tom Harris celephi...@gmail.com
On 21 January 2014 05:49, Jim Lux jim...@earthlink.net wrote:
So here's my next idea..
Set up a 24 hour movement (no minute hand) so that you have the sun moving
around the dial: at the top at solar noon, with the rate being reasonably
constant
of course was amazingly strong for it's diameter.
Myself I'd use a pneumatic cannon, since I have one, rather than a crossbow.
Tom Harris celephi...@gmail.com
On 11 December 2013 15:55, Jim Lux jim...@earthlink.net wrote:
On 12/10/13 5:57 PM, Don Latham wrote:
I always thought invar
There is a good writeup of the Dicke switch in Horowitz Hill The Art of
Electronics, since Horiwitz is a radioastronomer of note. I've just bought
my daughter a copy for Xmas, poor girl, she wants to be an engineer...
Tom Harris celephi...@gmail.com
On 11 December 2013 13:02, Don Latham d
photodiodes, instead of the tradional PMTs.
Tom Harris celephi...@gmail.com
On 13 December 2013 14:19, Brooke Clarke bro...@pacific.net wrote:
:Hi Tom:
I can't find anything in the Table of Contents or in the index.
Can you tell me the page or title of the writeup?
Have Fun,
Brooke
.
Tom Harris celephi...@gmail.com
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wrote:
Le 09/12/2012 11:28, Tom Harris a écrit :
Greetings Time Nuts.
Time related, but unusually so:
I am examining the DCF77 (see
http://en.wikipedia.org/wiki/**DCF77http://en.wikipedia.org/wiki/DCF77for a
refresher) data output from a master clock intended to drive a series of
slave
:24 PM, mike cook mc235...@gmail.com wrote:
Le 09/12/2012 11:28, Tom Harris a écrit :
Greetings Time Nuts.
Time related, but unusually so:
I am examining the DCF77 (see http://en.wikipedia.org/wiki/DCF77 for a
refresher) data output from a master clock intended to drive a series
should be coded as '7'. However I am
seeing a value of '3', which is Wednesday.
Is this normal, do wired DCF77 slave clocks transmit munged dow data to
prevent them being used with someone else's master clock? If they do I am
hosed since I am trying to reverse engineer the master clock.
--
Tom Harris
a high sensitivity, and I can use an active antenna if
needed.
Am I wasting my time. Sorry for not requiring the time more accurate
than a second, but that's all the clients require.
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the drift characteristics of the TCXO, which
it then compensates to generate indicated time. The TCXO's that I have
played with have a very predictable aging characteristic over time, at
least in a normal home/office environment.
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- Original Message -
From: Tom Harris celephi...@gmail.com
To: time-nuts@febo.com
Sent: Friday, September 07, 2012 5:53 AM
Subject: [time-nuts] DCF77 Generation
Greetings,
I have just written some code for generating DCF77 pulses given a 100ms
clock interrupt and an accurate
Greetings,
I have just written some code for generating DCF77 pulses given a 100ms
clock interrupt and an accurate timestamp from a RTC, for a mate who has
to get some imported clock movements synced up (we are in Australia which
has no radio time service). I did a quick search and found very
an advert around 7 pages long
in New Scientist. In this advert, he published a scientific paper,
since no mainstream journal would publish his paper.
I
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Kasper,
I like your style! Small ROM = no inessential features! I shall be
studying this code, getting capture working with no capture hardware
is a real pain.
On 2 January 2012 00:53, Kasper Pedersen time-n...@kasperkp.dk wrote:
On 01/01/2012 12:23 PM, Tom Harris wrote:
I too have been
for this is that the RTC chip for a product has the engaging
property of shifting it's frequency by several ppm after being
soldered to the board, and I need to characterise this to get accurate
timing for the product.
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Tom Harris celephi...@gmail.com
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