[RFI] RE: A Serious Threat

Michael Tope W4EF at dellroy.com
Thu May 15 15:24:54 EDT 2003

As far as I am concerned, this whole movement is a backdoor attempt
to "take over" already allocated radio spectrum via a corruption of
the regulatory process. Make sure you make your voices heard. The
government does all kinds of stupid things when they only hear one
side of the argument. The fiasco with the so-called gasoline
oxygenate MTBE is a good example. The government was presented
with bad scientific data suggesting that adding MTBE to gasoline
would reduce air pollution from automobiles. What these scientists
didn't tell the government was that it also reduced efficiency. As a
result, cars using reformulated gasoline with MTBE have to burn
more fuel to go the same distance so the net release of
pollution is the same as when there is no oxygenate present. MTBE
also dissolves readily into ground water and is poisonous to humans.
Nice hugh! So don't think for a minute that reason and good science
will prevail on its own. This is politics - the squeaky wheel gets the
grease. Vote early and vote often.

73 de Mike, W4EF...............................................

----- Original Message -----
From: "morel" <morelg at 013.net.il>
To: "Michael Tope" <W4EF at dellroy.com>; <spammers at must.die.com>;
<rfi at contesting.com>
Sent: Thursday, May 15, 2003 1:37 PM
Subject: Re: [RFI] RE: A Serious Threat

> Most PLC systems I have already tested for FCC Part 15 EMC
> are connected to lines via a kind of small injection XFMR. All tested PLC
> systems in early or advanced R&D stages are a powerful broadband noise
> source which become more dangerous as the owner house has extended
> 120/240Vac cabling which is an "excellent"antenna radiator.
> Not only radioamateurs receivers are affected, broadcast listeners are
> sniffing too the heavy noise despite their reduced front end sensitivity.
> Notches are not necessarly the most efficient solution as the noise is
> broad and it's creating a very strong field around which will reduce
> dramatically the overal dynamic performance of the receiver front end.
> 73,
> Morel Grunberg
> 4X1AD
> EMC/RFI Dept. - Telrad Networks Ltd.
> ----- Original Message -----
> From: "Michael Tope" <W4EF at dellroy.com>
> To: <spammers at must.die.com>; <rfi at contesting.com>
> Sent: Thursday, May 15, 2003 9:07 PM
> Subject: Re: [RFI] RE: A Serious Threat
> > There are two systems. Homeplug is a PLC standard for in-home local
> > area networking (connecting PCs together inside a home using the AC
> > wiring). The other system which is subject of the FCC Notice of Inquiry
> > is a WAN standard which will be used to deliver broadband internet
> > to homes using MV (medium voltage) powerlines. I believe the MV
> > to LV transformers (pole-pigs) will be bridged with some kind of special
> > equipment in order to the signals from the powerline side to the house
> > drop side. The system is attractive economically because the rollout
> > costs are relatively low (no poles to set or wire to run). There is a
> > of money behind this technology (they have already developed ASICs
> > for the modems), so I would encourage everyone to submit comments in
> > response to the FCC NOI. I plan to do so. You kind find details on
> > the ARRL's PLC webpage:
> >
> > http://www.arrl.org/tis/info/HTML/plc/
> >
> > I especially encourage everyone to take a look at Ed Hare's report to
> > IEEE C63 EMC standards committee. From the looks of Ed's analysis,
> > PLC will be a RFI nightmare for hams if it is widely adopted (we
> > are talking about S9+ QRM from 2 to 30 MHz).
> >
> > http://www.arrl.org/tis/info/HTML/plc/files/C63NovPLC.pdf
> >
> > 73 de Mike,
> >
> > ...
> >
> >
> > > I'm under the impression that PLC will be used only to carry the
> > > connection on the secondary - i.e. from the low voltage side of the
> > > transformer into the home. (That's bad enough.)
> > >
> > > Will PLC be used to transport signals on the primary (HV) side?
> > >
> >
> >
> >
> >
> > _______________________________________________
> > RFI mailing list
> > RFI at contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> >

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