"N2EY" wrote:

None of it is good news for hams.


It darn sure doesn't sound like it.


Basically they come down to two ideas:

1) spectrum masking, which consists of not
allowing the BPL systems to use frequencies
in the ham bands. (snip)


That has already been done with other devices and experience shows it
doesn't always work reliably.


2) "improved modes and modulations", which
permit the use of lower signal levels and
hence lower signal leakage. Supposedly.


On the HF frequencies, any leakage is significant.


The BIG problem is obvious to anyone who
actually goes out and looks at a typical
aerial distribution system. Lots of nice,
long wires, way up in the air, running all
over everyone's neighborhood. Put a little
RF in them and watch it radiate.


Exactly. That's what got me thinking about this in the first place. My
entire neighborhood is surrounded with power lines, some very high voltage
lines. While none are exactly next door, many are within sight.


You can read the comments of others and leave
your own at the FCC website, via the ECFS system.


I'll check into that, Jim. Thanks.


Dwight Stewart (W5NET)

http://www.qsl.net/w5net/

In article , Dwight Stewart
writes:

N2EY" wrote:

None of it is good news for hams.

It darn sure doesn't sound like it.

Visit the ARRL website and read their articles on it. Lots of good info. Note
the difference between existing PLC systems, Access BPL, and in-building BPL.

Basically they come down to two ideas:

1) spectrum masking, which consists of not
allowing the BPL systems to use frequencies
in the ham bands. (snip)

That has already been done with other devices and experience shows it
doesn't always work reliably.

Exactly.

2) "improved modes and modulations", which
permit the use of lower signal levels and
hence lower signal leakage. Supposedly.

On the HF frequencies, any leakage is significant.

Particularly given the ubiquity and proximity of power lines to typical amateur
installations.

The BIG problem is obvious to anyone who
actually goes out and looks at a typical
aerial distribution system. Lots of nice,
long wires, way up in the air, running all
over everyone's neighborhood. Put a little
RF in them and watch it radiate.

Exactly. That's what got me thinking about this in the first place. My
entire neighborhood is surrounded with power lines, some very high voltage
lines. While none are exactly next door, many are within sight.

The real villians for radiated noise are the medium voltage distribution lines.
For conducted and induced lines, it's the low voltage service wires.

You can read the comments of others and leave
your own at the FCC website, via the ECFS system.

I'll check into that, Jim. Thanks.

Comments are closed but reply comments are still open. You can read mine there
- search under my last name.

73 de Jim, N2EY