[time-nuts] Optical link connects atomic clocks over 1400 km of fibre
phk at phk.freebsd.dk
Thu Aug 25 04:25:49 EDT 2016
In message <1057836989.2088307.1472104857885.JavaMail.yahoo at mail.yahoo.com>, Br
uce Griffiths writes:
>You'd need a rather thick copper jacket to shield effectively
>against the 50Hz magnetic field.
As in: A good-sized fraction of the wavelength if I recall :-)
Electric fields are so much easier...
One interesting thing here is that across distances like this,
there would be significant longitudal currents in such a shield.
Not as bad as metal spanning the Mississippi, but getting there.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
More information about the time-nuts