[Lf] UK AM broadcasters concerned about ADSL]

[Andre' Kesteloot]

Dave Sergeant wrote:

> >From Dave G3YMC
>
> Stewart Bryant wrote of an article in Saturday's Times about ADSL:
> >BRITISH TELECOM'S plans for a nationwide rollout of
>  > high-speed Internet services has come under an
>   >unprecedented attack from the entire UK radio industry,
>   >which fears that the planned network will cause
>   >interference to millions of radio listeners.
>
> There was an extensive article in IEE Communications journal about a year
> ago which analysed the whole issue of xDSL and its potential for
> interference with braodcast, amateur and other services.  I have mislaid the
> original article but I remember it pointed out that the AM broadcast service
> operates in a different way in the USA, where transmitting stations tend to
> be located in city centres, than in Europe where they tend to be in remote
> locations away from cities.  This was pointed out may result in more
> interference problems in Europe than in the USA where ADSL has been in use
> for some years.  It may now be that these problems are being experienced,
> and presumably if the RA takes a tough view it could spell big problems for
> BT.  At the moment ADSL is only available in London and the other large
> cities but is scheduled to expand in the next year or so.
>
> I noted with amusement, in the discussion of amateur interference, that ADSL
> was not thought to be an issue here as amateurs do not transmit below
> 1.8MHz!  In fact the ADSL baseband starts around 400kHz so perhaps the
> effects on Radio 4 and 136 will not be a problem - but only time will tell,
> and interference in general is slowly getting worse.
>
> 73s Dave
> sergeantd at compuserve.com
> dsergeant at iee.org
> http://ourworld.compuserve.com/homepages/sergeantd