87.5 MHz signal in France
John Butler
Has anyone any idea what the tones permanently resident on 87.5 MHz throughout
France are? At 87.5MHz FM there is a constant tone about 1 KHz which every so
often gives a short cadence then resumes. It is not a single station marker as
I was getting it all up the French west coast and it sounds a bit complex for
that. Some data or time signal transmission?
--
John Butler email: j...@dcs.ed.ac.uk ___
Department of Computer Science (ovo)
University of Edinburgh phone: (+44) (0)31-650-5181 ((`-'))
Edinburgh EH9 3JZ, UK. fax: (+44) (0)31-667-7209 -"-"-
Bernd Sieker
|>
|> Has anyone any idea what the tones permanently resident on 87.5 MHz throughout
|> France are? At 87.5MHz FM there is a constant tone about 1 KHz which every so
|> often gives a short cadence then resumes. It is not a single station marker as
|> I was getting it all up the French west coast and it sounds a bit complex for
|> that. Some data or time signal transmission?
As far as I am informed this signal is present in Germnay, too and is
just a sort of beacon that marks the lower edge of the FM Broadcast
Band in Europe (88 MHz to 108 MHz).
I was told that this was set up to simplify the adjusting of the
tuning capacitor's left edge when fine tuning the device in the
factory.
The LF tone makes this 'cadence' to be not mistaken with some noise
signal that might be in the vicinity. If you tune a simple FM
broadcast receiver in Germany to the left edge, you very often hear
that sound.
If anybody knows more (or better), please followup!
|> --
|> John Butler email: j...@dcs.ed.ac.uk ___
|> Department of Computer Science (ovo)
|> University of Edinburgh phone: (+44) (0)31-650-5181 ((`-'))
|> Edinburgh EH9 3JZ, UK. fax: (+44) (0)31-667-7209 -"-"-
--
_ Real Life Bernd Sieker, Universitaet Bielefeld
only // IRC Pink
Amiga__// HAM Radio DG 6 YHI
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David Josephson
>In article <CB4wL...@dcs.ed.ac.uk>, j...@dcs.ed.ac.uk (John Butler) writes:
>|>
>|> Has anyone any idea what the tones permanently resident on 87.5 MHz throughout
>|> France are? At 87.5MHz FM there is a constant tone about 1 KHz which every so
>As far as I am informed this signal is present in Germnay, too and is
>just a sort of beacon that marks the lower edge of the FM Broadcast
>Band in Europe (88 MHz to 108 MHz).
>I was told that this was set up to simplify the adjusting of the
>tuning capacitor's left edge when fine tuning the device in the
>factory.
>The LF tone makes this 'cadence' to be not mistaken with some noise
>signal that might be in the vicinity. If you tune a simple FM
>broadcast receiver in Germany to the left edge, you very often hear
>that sound.
>If anybody knows more (or better), please followup!
Paging. All over F, D, CH and NL. A four- or five-tone sequence
similar to the original Reach pagers here, but carried on a low
VHF channel, and slower than Reach or Motorola 5-tone.
--
David Josephson <da...@josephson.com>
skn...@googlemail.com
Look at this sites: www.oebl.de/eurosignal oder www.eurosignal.org
Ian Jackson
skn...@googlemail.com writes
below the lower edge the FM radio band. If I recall correctly, it used
to repetitively transmit a sequence of the same four "diddle-dee-doo"
musical tones - and these varied when anyone was being paged. See
https://nl.wikipedia.org/wiki/Semafoon
"Het semafoonnetwerk werkte met vier frequenties (kanalen): 87,15,
87,20, 87,25, 87,30 MHz. Dat is iets onder het FM-bereik."
A further quick Google suggests that modern pagers use other
frequencies.
[I'm pretty certain that, in the early 60s, the original name was
'Simafoon'.]
--
Ian