I think that is the BIPM (http://www.bipm.org/en/home/) in association
with the IERS (http://hpiers.obspm.fr/)
Peter
On 28 March 2010 10:29, Steve Rooke sar10...@gmail.com wrote:
What puzzles me is who is the keeper of legal time for the other
93.4% of land mass and 95.5% of
While Britain and Europe may agree on the definition of billion
FWIW Britain is part of Europe. It would seem that Britain and
continental Europe don't agree on the meaning of billion.
Billion in the UK changed its meaning quite some time ago to accord with
the American usage (see
An off-topic from time to time is great, but a new email every minute
unrelated with time-nuts is a bit too much, didn't you think ?
Sorry, I don't want to be rude.
Don't apologise. Why the posters think this puerile off-topic drivel is
acceptable on the time-nuts list beats me. If they
I had a look at it again... and I'd say it is more like 3 meters up from
the chimney, but it is still 4 m up from the roof at the chimney so it is
a bit hard to get to.
If you are in Scandinavia, the GPS birds will not spend much time (if
any?) to the north of you. Slide 12 of
Steve,
The HP 10811AB manual lists several manufacturers of suitable connectors:
CINCH 50-30S-30 (HP 1251-0160),
Vishay/Dale (HP 1251-2035) EB81-BN15TGW,
EDAC 305-030-500-202 or 357-030-520-202 or equivalent
I bought from Mouser (http://www.mouser.com/) a year or so ago:
Mouser no.
On 3 Oct 2008 at 13:41, Steve Rooke wrote:
Call me crazy but I wonder if my accurate relative period of time
could be derived from the 230VAC 50Hz mains supply over here. Now,
before you yell at me, consider this, I have a couple of mains driven
clocks in the house and only seem to need to
Electric clock time: NGET will endeavour (in so far as it is able) to
control electric clock time to within plus or minus 10 seconds
(http://www.nationalgrid.com/NR/rdonlyres/4894C7AA-DCD2-4835-9986-
57338C31C86A/9922/BC3_i3r18.pdf - section BC3.4.3)
For some reason I could not get this
snip
everything in sync. Syncing between two local resources (main hard drive
and USB hard drive) is not too hard, considering the transfer speed that
can be achieved, but mirroring the web resources is a pain, partly because
of speed and partly because of OS differences in file name rules
On 24 Jul 2008 at 8:27, Murray Greenman wrote:
and second that the time around the loop is
changed by the instructions involved in loading.
Well, the timing can be kept constant by always adding in a value.
For the AVR, using a branch to test for overflow is not necessary: ROL
followed by
Before you do this find out what the reflection coefficient is for the
Thunderbolt input and the active antenna output when using a 50 ohm cable.
The active antenna may not be that well matched to 50 ohm cable.
Then adjust the cable length to an odd multiple of half the signal
wavelength
I've seen that you're right, Thunderbolt is originally supplied with 75ft
of 75 ohm RG-59 cable, as indicated in the manual... So I've the inverse
problem: the GPS antennas we have in the roof both have 50ohm cable :)
So... would be good to change the impedance at the Thunderbolt antenna
port
Then adjust the cable length to an odd multiple of half the signal
wavelength in the cable.
snip
Nothing to do with impedance transformation.
Just the phase shift associated with propagation down the cable and back
is then 0.
And this is also the case for a cable whose length is an even
What is the difference between 1E-12, 10E-12, and 10^-12?
E means raised to the power of ten.
E means times ten raised to the power (as, indeed, it says in the
wikipedia reference below) which is not the same thing as raised to the
power of ten.
x E y is shorthand for X * 10^y.
(See
the caseit is probably enshrined in law in the UK. Also Our
nominal voltage is 240v not the 230v decreed by the EU fortunately we
According to the Electricity Supply (Amendment) (No. 2) Regulations
1994 (Statutory Instrument 1994 No. 3021) at
Mike , this is correct. if you display just under 10Mhz , you have a
digit better resolution. My counter does the same
The same applies to 1Mhz , 100Mhz , etc . When the counter just has to
go to the next higher digit, it will loose one digit resolution.
Not if the counter can roll-over
Cambridge University Press, which is a non-profit company.
I am unsure of the relevance of the above statement but, being
pedantic (as befits time-nuts):
Cambridge University Press is part of the University of Cambridge
[see http://www.admin.cam.ac.uk/univ/so/so_statj.pdf], and the
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