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Date: Mon, 02 Aug 1999 12:38:59 +0100
To: rsgb_lf_group@blacksheep.org
From: "M. Bruno" <spin@inrete.it>
Subject: Re: LF: Mystery VLF signals in Italy
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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

spin@inrete.it

Rivalta, ITALY JN35SA (N 45 01' 25.6", E 7 31' 09.4")