-------- In message <20170317220437.4a4ff406...@ip-64-139-1-69.sjc.megapath.net>, Hal Murray writes: > >e...@scace.org said: >> Frequencies around 15 Hz were common on early 20th century cables, >> depending on the degree of success in compensating for the inherent >> capacitance on a cable thousands of miles long surrounded by conductive >> sea water. > >Is the sea water relevant?
Not in a coaxial cable, unless it gets into the cable. Most telegraph cables where not coaxial and used the sea-water as return path. >Does enough energy leak through the shield so that it matters? How well does >coax work at low frequencies? Coax is near perfect at low frequencies, but the lengths of these cables introduced geophysics as a number of sources of noise. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
