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Message-ID: <3.0.5.32.19990623153056.009e8b90@sunf0>
Date: Wed, 23 Jun 1999 15:30:56 +0100
To: rsgb_lf_group@blacksheep.org
From: "Simon Lloyd-Hughes" <simon.lloyd-hughes@rd.bbc.co.uk>
Subject: Re: LF: Noise from phone lines
Cc: rpagejones@iee.org
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Did you mention this to the EMC Commmittee?  Although we are aware of many
technologies that can cause problems if we do not know of specific ones we
can not help.  In many cases the developers of these technology are unaware
of potential problems.  These problems are brought to their attention and
action taken where possible.

You may have read in some of the Computer magazines people having problems
with second telephone lines for internet use.  They have discovered in many
cases an an 'electronic splitter block' (I think its called a DEX unit) is
being used instead of another telephone line.  Because they are not being
told that these units are in use and the data rate is much less than
advertised users are requesting them to be removed and a seperate line
installed.

This has only happenned because users have complained both to the companies
and to the computer magazines.


8:50 15/06/99 +0100, you wrote:
>G4WHO wrote :
>
>>BT also have a wonderful little pair of boxes which duplexes two BT lines
>onto
>>one physical pair of cables. If someone near you has had one fitted
>depending on
>>the technology used this could increase the noise on the phone lines.
>
>Last year I started hearing approximately one-second ticks with a double
>tick on the minute on all radio frequencies up to 5 MHz, including 136. I
>thought at first MSF was running amok but it was coming from overhead phone
>lines running alongside my property and was somehow linked with a nearby
>cellphone installation. I moaned to BT who said they could do nothing about
>it  - "everything was within spec"  and it was somehow my fault for living
>too close by.  What with this sort of thing and the broadband noise now
>covering 160m over large areas of the country for hours on end I'm
>beginning to think my amateur radio days are over!
>Walter G3JKV 
>
>
>
>
>