This is of interest showing a clear 64 Hz line, 50 Hz background mains
(Europe) and what always interests me- a high ELF earth resonance
increasing below 20 Hz and showing in red at the lower portion of the
graph
http://tech.groups.yahoo.com/group/humforum/message/11354
(I can't post the imageshack link on here for some reason)
There was very little analysis (unusual for the site) but it's good to
see people are getting used to flagging up specifics on their own
volition- and records like this will hopefully grow in time- becoming
the standard fare for Humz discussions rather than subjective comments
from far and wide.
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