雑音源となる負荷とは変圧器で隔離され、電力会社の設計下で構築される中圧配電線を前提とした計算ですね。しかもアメリカでは地中化率が高い。

インバーター使用機器などの雑音源が直接接続されるためそれに打ち勝つ通信電力を必要とし、需要家による自由な引き回しを許す屋内配線を利用しようとしている我が国のPLCとは事情が異なるでしょう。

地震直後現地の錯綜する通信波を傍受した一人ですが、
現在の日本のPLC推進企業、推進団体の態度・姿勢は
人命を軽視したやり方だと警鐘を鳴らしたいと思います。

LONDON (Reuters) - Plans to send Internet broadband signals down mains
electricity cables rather than telephone lines could hit the radio hams
whose transmissions were so vital in the aftermath of the Asian
tsunami, New Scientist magazine reported on Wednesday.

The technology is being pushed by power companies keen to compete with
traditional broadband suppliers and get a slice of the profits from the
demand for fast Internet connection.

"The downside is that packets of Internet data pulsing down unshielded
mains cables makes the cables behave like aerials that send short-wave
interference beaming out over a wide area," the magazine reports.

Amateur radio operators believe this could threaten reliable
communications on short-wave frequencies, which are invaluable to
global broadcasting and emergency communications when all other options
fail.

"A few extra decibels of interference from future networks and I would
not have been able to hear the news from amateurs in Sri Lanka, India
and the Andaman Islands," Hilary Claytonsmith of the International
Amateur Radio Union's UK branch told the magazine.

The U.S. government approved the power line technology in October,
while the European Commission (news - web sites) is set to approve its
version soon.

The U.S. Federal Communications Commission (news - web sites) (FCC
(news - web sites)) has ruled service providers must use filters on
their household equipment, to avoid the problem. The EC is trying to
set similar rules.

上記の記事の翻訳は下記のURLに掲載されています(ITmediaニュース)

http://www.itmedia.co.jp/ne...