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August 18th 05, 03:02 AM

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On 17 Aug 2005 09:55:16 -0700 wrote:

| The "notching" solution is simple: Their BPL system does not use
| frequencies that are also ham bands. Whether it works or not is an open
| question.

What about MARS and SWL frequencies?

| - BPL is a "last mile" delivery method, not a complete system. Still
| needs a 'head end'

I've seen pictures of these units on primary (12 kV) lines, so by
"last mile" this must mean more than just the drop into the home.

| - BPL bandwidth is shared between users on the same line, so as your
| neighbors sign up and use the system, your performance degrades.

On what line? The primary (12 kV) or the secondary (120/240 V)?

| - There are other technologies (like Wi-Fi) which can do the same job
| without all the fuss and bother.

These are on 12cm and 5cm from what I have heard.

| - The big danger of BPL is that it turns the whole idea of spectrum
| protection and allocation upside-down, and sets a bad precedent.

It can also be susceptible to ham transmissions, which will unfairly blame
the ham radio operator as the cause of networking failures.

It will also be susceptible to interference from natural sources such as
lightning and other manmade sources such as occur with many electrical
devices. It would be quite easy to have a case where the computer power
supply, computer monitor, television, fluorescent lights, etc could cause a
degradation of the service.

Dee D. Flint, N8UZE

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