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Dear Henny,
my QTH is about 400 m from a railway line,
and I regularly saw their 16.667 Hz power frequency and several ELF
harmonics. The E-fields are relatively strong as the lines normally do not carry
a grounded top wire for lightning
protection. The "modulation" could be caused by some switching
activity.
Another origin might be a
controlled rectifier on the 50 Hz mains, which could be triggered
at a subharmonic frequency.
Best regards,
Markus, DF6NM
----- Original Message -----
Sent: Wednesday, March 04, 2009 7:43
PM
Subject: LF: capture 67hz.jpg
Hi,Lf
capture unid signal 67hz,but who ?
henny pa3cpm
best 73s
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