At 09.21 02/08/99 +0200, you wrote:
From HB9ASB, JN36pt
I've never seen a response to Marcos query about the signal on 1025 Hz.
Here a possible explanation:
Of course I can see and hear the signal, like many others in the VLF/ULF
range, at my QTH.
They are coming over the mains but I can receive them also fro the air
with my 136 kHz aerial and detect them with my receiver and the
soundcard and spectrogram. The sources - at least here in Switzerland -
are well known. The signals are generated by our power stations and feed
into the mains to control street lamps, electricity counters in the
households (different day/night charges for the kWh) and other devices.
................
Thanks to Tony for the explanation. In effect I had no other responses,
except one from Gamal Soegiono, noting the use of 687 Hz in Germany for
the same purpose.
Well, mistery solved ... but there are a few more man-made signals
around 50 Hz. I will post a message in next days.
Thank you again, Toni.
73 - Marco IK1ODO
[email protected]
Rivalta, ITALY JN35SA (N 45 01' 25.6", E 7 31' 09.4")
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