Powerline 4 Megabit/s

[Brian Densmore]

What you get with twisted pair is a continually spiraling RF, which
would reduce interference on the twisted pair, but sends out (slightly
reduced) RF in all directions. Not enough power in twisted pair networks
to disturb other electronics, unless really close or really sensitive.
High power lines, now that is a different story. Right now the RF they
generate is in the VERY LARGE wavelengths (as in miles long). There is a
reason the FCC limits telephone lines to 53K ... "radio" (as in the
radio band of the EMS) interference. I can't begin to imagine how they
would freak about high power lines generating high frequency radio
interference.

> -----Original Message-----
> From: David P. Engvall [mailto:davideng at ponyexpress.net]
> Sent: Tuesday, October 23, 2001 11:12 PM
> To: zscoundrel
> Cc: DCT Jared Smith; kclug at kclug.org
> Subject: Re: Powerline 4 Megabit/s
> 
> 
> I think that might not be quite right.  The reason twisted 
> wire is used
> for networking is to limit interference from ambient RF.  It 
> takes power
> to make an effective transmitter.  Maybe the low power signals on an
> untwisted wire would be vulnerable to interference but I'm not sure
> they would produce much.
> 
> zscoundrel wrote:
> 
> > Wave goodbye to TV and radio reception!  4.5mb/s on our unshielded
> > single-strand power distribution system would turn the each 
> leg of the
> > power lines into giant RF noise generators.
> >
> > The reason the little wires in your CAT5 network cable are 
> twisted arond
> > each other is to limit the amount of radiated noise.
> >
> > DCT Jared Smith wrote:
> >
> > > 
> http://www.ascom.com/apps/WebObjects/ecore.woa/de/showNode/sit
> eNodeID_19589_
> > > contentID_134952_languageID_1.html
> > >
> > > or if e-mail broke this link,
> > > go to http://www.ascom.com and click on:
> > >      25/09 Powerline Communications in Switzerland.
> > >
> > > This is compelling; I've seen the idea from time to
> > > time on Slashdot, but no one here in the States seems to
> > > be taking advantage of it. From what I can tell the electric
> > > company becomes a broadband provider, and
> > > though not specific, they say it is conceivable it
> > > could be less expensive than other forms of
> > > broadband. At 4.5 Megabits/s, it's worth looking
> > > in to. Maybe we can convince Ascom to set up the
> > > first North American installation right here in KC.
> > >
> > > I think it would perfectly address what Sunflower
> > > is looking for... but it might be a ways off yet!
> > >
> > > -J
> > >
> > >
> > >
> > >
> majordomo at kclug.org
> > >
> > >
> >
> > --
> > At 20, I was liberal, because I had nothing to lose and so 
> much to gain.
> > by 40, I was conservative, because I had so much to lose 
> and so little to gain.
> > Isn't it amazing what 20 years of hard work and experience 
> will do for ones' point of view?
> >
> majordomo at kclug.org
> 
> 
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