|
Nederlands Forum over Oude Radio´s |
waarom PLC een slecht idee is
Geschreven door Arjan Muil op 20. Sep 2003 20:29:16:
Een beetje off topic maar toch misschien interessant.
Onze mooie oude radio's geven nog steeds radiosignalen weer maar dit kan de komende jaren minder worden. Niet alleen digitalisering van de modulatie (DRM) is een bedreiging maar ook de mogelijke introductie van PLC (powerline communicatie).
De Europese commissie staat op het punt om PLC vrij te geven en heeft een "Call for contributions on powerline communications" op internet gezet.
http://europa.eu.int/information_society/topics/telecoms/regulatory/publiconsult/powerline_communications/text_en.htmHet onderstaande bericht heb ik van een nieuwsgroep overgenomen.
Als we willen blijven luisteren naar het warme buizengeluid van onze verzameling is het misschien waard om te reageren.
Groeten,
Arjan, PE2AJM
---------
The EU is looking to give the PLC industry a blank cheque to pollute
the shortwave with emissions from their broken legacy technology. We
must respond and submit comments before October 1st.Check here;
http://europa.eu.int/information_society/topics/telecoms/regulatory/publicon
sult/powerline_communications/documents/cocom03_32.pdfAnd
http://europa.eu.int/information_society/topics/telecoms/regulatory/publicon
sult/powerline_communications/text_en.htmNotes for making a submission;
With respect (be polite NO FLAMES), you wish to point out that PLC has
experienced many problems and no technical data has been presented
that the PLC problems are resolved and the threats from PLC are very
significant.Introduce yourself, if you have a particular expertise tell them.
Key is to support Broadband and offer positive alternatives such as
Wireless. Focus on all users of the shortwave, particularly where they
have no alternative. It is easy for the PLC industry to dismiss hams
bit more difficult when it comes to aeronautical radio and safety of
life communications.Applaud and support the implementation of the Broadband imitative,
point out that Broadband can be delivered by many diverse means
including DSL, Cable, Wireless, Satellite etc.
WiMax in particular can make a significant contribution to Wireless
Broadband.
wimaxforum.orgIntel has pledged to enhance WLAN standards and the technologies they
encompass to such an extent that copper cabling can be eliminated as a
network medium.
http://www.theregister.co.uk/content/69/32917.htmlThe shortwave spectrum is used for many diverse applications including
Broadcasting, Aeronautical, Radio Astronomy, Security, Amateur Radio,
most of which will have no alternative if PLC is permitted to create
interference. In addition the shortwave is used for point to point
links in other countries in particular the Third World and widespread
use of PLC could disrupt these communications.Interference from PLC is very difficult to trace, when a licensed
radio service causes a problem it can be quickly identified and the
issue addressed. In the USA a division of the FAA reported that it had
to cease operations on one aeronautical band at one of its facilities
due to interference from PLC products and the FCC was unable to
resolve the issue.
http://gullfoss2.fcc.gov/prod/ecfs/retrieve.cgi?native_or_pdf=pdf&id_documen
t=6514683399PLC systems can suffer interference from licensed radio services and
strong local radio signals could also result in intermodulation
signals that could cause interference to FM radio and VHF aircraft
frequencies.Japan has very extensive and inexpensive Broadband rollout and has
banned PLC due to interference concerns.Cite from the BBC reports here;
http://www.bbc.co.uk/rd/pubs/whp/whp063.html
http://www.bbc.co.uk/rd/pubs/whp/whp-pdf-files/WHP055.pdf
http://www.bbc.co.uk/rd/pubs/whp/whp012.html
http://www.bbc.co.uk/rd/pubs/whp/whp013.html
http://www.bbc.co.uk/rd/pubs/whp/whp004.htmlRadiocommunications agency
http://www.npl.co.uk/electromagnetic/rfmff/tech-transfer/freemet/meeting_4/t
revor_clarkson.pdf
Slide 15 shows a 30 db increase in the noise level due to PLC.Good information from the ARRL here;
http://www.arrl.org/~ehare/bpl/hyperlinks.htmlPLC interference complaints are listed here;
http://www.darc.de/referate/ausland/iaru/eurocom/euronews0103.pdfKey that as many individual different submissions are made, focus on a
particular issue, make it your personal call for the shortwave - the
commons of the radio world be preserved. Also may like to contact your
MEP and raise the issue.Please forward this email to anyone who can help, in particular other
European countries.
- Re: waarom PLC een slecht idee is Roland 20.9.2003 21:03 (4)
- Re: waarom PLC een slecht idee is Mans Veldman 20.9.2003 21:37 (3)
- Re: waarom PLC een slecht idee is Ed van der Weele 21.9.2003 02:55 (2)
- Re: waarom PLC een slecht idee is Andries van Bronkhorst 24.9.2003 11:26 (0)
- Re: waarom PLC een slecht idee is Hans 22.9.2003 10:58 (0)