Hello Ossi, Stefan, and all,
Paul has post-processed his recorded data from Todmorden, UK, and posted
this info on the VLF group (
http://tech.groups.yahoo.com/group/VLF_Group/message/16833 ). The
readings are absolute magnetic fieldstrengths.
73, Wolf .
>>>>
It looks like OE5ODL has been transmitting most days since the beginning
of the month. Going back through the raw data gives:
(Durchschnittliche H-field Signal, von 12.00 bis 16.00 Uhr
jeden Tag gemessen)
2011-01-03: 8970.0038Hz 0.12fT
2011-01-04: Signal nicht gefunden;
2011-01-05: 8970.0320Hz 0.08fT
2011-01-06: 8970.0341Hz 0.14fT
2011-01-07: 8970.0310Hz 0.12fT
2011-01-08: Signal nicht gefunden;
2011-01-09: Signal nicht gefunden;
2011-01-10: 8970.0226Hz 0.10fT
2011-01-11: 8970.0241Hz 0.12fT
2011-01-12: Signal nicht gefunden;
2011-01-13: 8970.0244Hz 0.11fT
2011-01-14: Signal nicht gefunden;
2011-01-15: 8970.0183Hz 0.08fT
2011-01-16: 8970.0192Hz 0.11fT
2011-01-17: 8970.0205Hz 0.8fT Mit Ballon;
2011-01-18: 8970.0216Hz 0.12fT
2011-01-19: 8970.0210Hz 0.14fT
2011-01-20: 8970.0242Hz 0.08fT
2011-01-21: 8970.0265Hz 0.11fT
The signal seems pretty repeatable each day, the variation can be
accounted for by drift of the tx frequency. Noise levels are
at their lowest at the moment - dipping down sometimes to 20fT/sqrt(Hz)
between 12:00 and 16:00. I don't think this signal will be visible
above noise in other seasons.
(I used to keep just 10 days of raw, but since looking for meteors I've
added another 4Tbyte of disk space and now can keep at least 2 months,
in addition to permanent storage of Dec and Jan to continue study of
the Geminids and Quadrantids.)
--
Paul Nicholson
--
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