Bob somewhere buried in my collection of interesting bits I have a rather
battered demo sample of what the British GPO Research crystal labs refered
to as an Essen Ring. It is indeed around 3 inches in outer diameter and
almost an inch thick and wide. this would have been cut from natural
Hi Andy I recall many years ago when most of us had mains synchronous motor
clocks the frequency was tweaked nationally to set the clocks right at I
think 06:00 every morning. I guess since most now use quartz clocks that has
been dropped.interesting! Just turn the wind down a bit will
This topic has arisen several times in the past and again recently. This
month's Physics World, the magaizine of the UK's Institute of Physics
carries an article on page 36 describing Christiaan Huygens experiments in
the 1660s, and follows up with descriptions of some modern academic work.
I
It can be justified very simply that the phase mod data on 198kHz is NOT
intended as a standard time distribution. As far as I am aware only the
frequency accuracy is covered in the NPL contract. Even that no longer seems
to be monitored and offsets published.
Time distribution is on MSF
Paul, NPL are the sponsor of the Droitwich standard.
See https://www.npl.co.uk/products-services/time-frequency/gps-bulletins
I have not used Droitwich for some time now, but It should be better than
you quote. NPL bulletins used to quote it at parts in 10^11. That is a long
term daytime
Hi David, thanks for that succinct explanation. The SSC is a "fudge" to
defeat the measurement technique, which has nothing to do with the
psychological effect of the interference, or the BER effect on the
legitimate user. In fact it is often easier for the legitimate user of
the frequency to
Hi Brooke to bring it up to date, David Rooney who was (is?) the curator of
the time gallery at Greenwich wrote a book on on the Belevilles, father and
daughter and their service to London clock repair shops . It is titled
''Ruth Belville: The Greenwich Time Lady'' and published by the National
Hi Nigel, NPL stopped monitoring Loran several years back now (before 2000).
Even my semi-formal contacts via the old T Club no longer respond even on
MSF problems. (He may have retired by now :-)) )
Alan
G3NYK
- Original Message -
From: "gandalfg8--- via time-nuts"
To:
Cc:
Hi Nigel, NPL have no involvement with eLoran, the contract for that is from
Trinity House. The site operator is Babcock Internationalbut I doubt
anyone there will admit to knowing what is going on.
:-((
Alan
G3NYK
- Original Message -
From: "gandalfg8--- via time-nuts"
Hi Ed I have a 5120A with a non-workinf DDS board. I cant remember the model
but I did find a generic ''circuit'' for how the DDS worked in one of the
later PTS manuals. I'm guessing you have already gone beyond that in your
circuit tracing. The 5120A has two boards and the only information
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