[RFI] RE: A Serious Threat

morel morelg at 013.net.il
Thu May 15 23:37:53 EDT 2003

Most PLC systems I have already tested for FCC Part 15 EMC (pre)compliance,
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 very
broad and it's creating a very strong field around which will reduce
dramatically the overal dynamic performance of the receiver front end.

Morel Grunberg
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 lot
> 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 the
> 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?
> >
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