[Elecraft] BPL achilles heel

[N2EY@aol.com]

In a message dated 9/30/03 5:38:50 PM Eastern Daylight Time, k7mw@cmc.net 
writes:


> I am not sure.  

I am

A distribution transformer has a fair amount of interwinding
> 
> capacitance at RF, with a common  ground connection. 

Not really. There's a faraday screen (actually a single open turn of copper 
sheet) between the primary and secondary, so that any short between primary and 
secondary has to go through the shield. Transformer failures of this kind 
were one reason Edison opposed AC distribution 100+ years ago. Westinghouse found 
the solution in the ground screen, which also acts to contain line noise.   

 Also, I think that it
> 
> is hard to win a legal issue with the argument that it would be to expensive
> for the other side.  I understand that BPL has been proven in other
> countries. 

Just the opposite - it has been banned in some due to interference and a flop 
in others.

73 de Jim, N2EY


--- StripMime Report -- processed MIME parts ---
multipart/alternative
  text/plain (text body -- kept)
  text/html
The reason this message is shown is because the post was in HTML
or had an attachment.  Attachments are not allowed.  To learn how
to post in Plain-Text go to: http://www.expita.com/nomime.html  ---