>Da: t...@leapsecond.com
>Data: 01/05/2014 8.07
>
>Hi Antonio,
>
>At some level, frequency standards are all affected by every environmental
factor
Tom,
thanks for your comments.
There is some geomagnetic activity today May 8, see http://www.swpc.noaa.
gov/rt_plots/satenv.html (GOES Hp a
Hi, Antonio,
I regularly note the geomagnetic Kp value when I take part in an FMT
but most of the discussion of this takes place on K5CM's FMT-nuts mail
list (as far as I know). Fortunately, most FMTs have not coincided
with a major storm but there have been a few where some really weird
eff
ator, then no worries. If it's more than
that, then you get to decide if you want to make your oscillator a better
timekeeper or a better sensor.
/tvb
- Original Message -
From:
To: "Discussion of precise time and frequency measurement"
Sent: Wednesday, April 30, 2014 3:28
Hi all,thanks for your replies.Geomagnetic storms are known to produce easily
detectable effects at earth, sometimes dramatic (
http://en.wikipedia.org/wiki/Solar_storm_of_1859 ,
http://www.youtube.com/watch?v=7ukQhycKOFw ), sometimes serious (compasses get
crazy), sometimes minor (only aurora
It's not exactly a time-nut quality oscillator, but the Earth's Schumann
Resonances (circa 7.83 Hz) are perturbed slightly as solar activity changes
the effective size of the ionosphere:
http://en.wikipedia.org/wiki/Schumann_resonances
On Mon, Apr 28, 2014 at 5:18 PM, iov...@inwind.it wrote:
>
Hi Antonio:
There's a sheet metal bender up the road from me and one of their customers was HP. The metal had special magnetic
properties and was used to shield an HP oscillator, don't remember which one, but maybe one of the Cs units. So for
that unit a change in the very small Earth's magne
Antonio,
That is a great question. I am not 100% sure of the answer myself, but I
am sure others will chime in.
I used to be responsible for an RF lab in which we did a lot of low-noise
measurements; had shielded racks, chamber, etc. - I can tell you from
experience that
anything that can raise
Alan
G3NYK
- Original Message -
From:
To:
Sent: Monday, April 28, 2014 10:18 PM
Subject: [time-nuts] Phase noise and geomagnetism
As our geomagnetic field gets quite noisy during geomagnetic storms (which
are connected to solar activity), I was wondering if this could affect
phase noise of o
As our geomagnetic field gets quite noisy during geomagnetic storms (which are
connected to solar activity), I was wondering if this could affect phase noise
of oscillators. I see that theoretically it could. Has anybody ever measured
phase noise increments which could be explained this way?Anto
