Message-ID: <3BE66466.F1BDFE8D@usa.net>
Date: Mon, 05 Nov 2001 11:05:26 +0100
From: "Alberto di Bene" <dibene@usa.net>
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To: rsgb_lf_group@blacksheep.org
Subject: LF: Re: spectrum 136kHz I2PHD/dj8wx
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Vernall wrote:

> Alberto and others,
>
> The most plausible explanation, as already mentioned on the reflector, is
> that the lines come from the sampling rate of 8 kHz used by digital
> telephone systems.  There could be several telephone exchanges in a city and
> while they likely have stable master oscillators, they are not necessarily
> "locked".  Telephone systems still use a lot of copper pairs, covering
> kilometres of distance, so it would be feasible for some radiation to occur
> for any high frequency spectral content in the telephone signal.
> [...]

Hello Bob,
   thanks for your message.
Yes, I had read that explanation on the reflector, but I am still puzzled, as I
live in a small village, and the local Telecom told me that  ADSL will be
available here not sooner than at least 6 months. And when they say 6 months,
they mean not less than 12....
I asked my neighbors, but nobody has an ISDN line here. Just plain old analog.
But ADSL and ISDN can be found in a nearby town, about 5 km from here.
Given that today all telephone lines are buried, I am a bit skeptical about the
possibility to receive the 17th harmonic of a signal passing in a buried line
five kilometers from here. But in my life I have learnt that often reality defies
intuition and reasoning...

73  Alberto  I2PHD