ARLA/CLUSTER: Petição para banir o PLC no Reino Unido.

[João Costa > CT1FBF]

Radio interference from Internet over mains units

The horrendous radio interference problems caused by devices providing
an Internet connection over the household electrical mains has become
a 'hot topic' recently with a petition being started on the Government
website to get the devices banned.

A number of companies are selling products that enable people to link
their computers or TV set-top boxes to the Internet via the household
mains. Such devices are even being supplied to consumers by British
Telecom (BT) as part of their BT Vision product.

In a recent posting on the DRM-L Yahoo group Mike Barraclough provided
some links demonstrating the interference these devices cause across
the radio bands. Mike wrote:

BT are supplying two Comtrend DH10-PF adaptors, they are being used to
communicate from the BT Home Hub by the computer to the BT Vision
V-Box by the television.

The interference affects all bands, there is limited, but not
particularly effective, notching in the amateur bands.

Here are some WAV files recorded two weeks ago by Alan Roe in
Teddington whose neighbours have these devices, Alan is a long time
shortwave broadcast band listener and editor for the World DX Club.

For each file, you'll hear Alan stepping through the range in 5 kHz steps:

4700-4800khz   13500-13600kHz
5900-6000kHz   15000-15100kHz
9400-9500kHz   17450-17550kHz
11500-11600kHz   25600-25700kHz

BT Vision is installed in 282,000 UK homes, the adaptors are supplied
as standard and the install guide says customers should use them.

There are alternatives to this technology, wired or wireless
solutions. Ofcom are logging complaints as spectrum abuse and it's
known that in three cases the adaptors have been removed by BT
following complaints to Ofcom.

However a complaints based system does not solve the problem, BT
Vision has been targeted so far at current BT Broadband users, they
are shortly to be advertising the system nationally.

For much more information - please go to the UKQRM website at:
http://www.mikeandsniffy.co.uk/UKQRM/

and join the Yahoo Group at:
http://tech.groups.yahoo.com/group/UKQRM/

and if you are a British citizen (including ex-pats) or resident sign
the petition at:
http://petitions.number10.gov.uk/SaveShortwave/



Mike

DRM-L Yahoo Group
http://www.groups.yahoo.com/group/DRM-L


-- Fonte: The Southgate News website
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