The myth that BPL is a solution for rural broadband
 

Phil Kane wrote:
snipped

Transmission voltages (34 KV and up) are something else. Those are
never worked hot.

I have a video of a crew working on a 'hot' transmission line of several
hundred thousand volts, using a helicopter. They don't shut down the big
lines unless it's absolutely necessary.


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Cecil:

Manufacturer and model #?
Or location of one in South Texas?
Or URL for manufacturer of one?
Outside a sub-station, of course, which will be the requirement for BPL
repeaters, which will also have to be bi-directional.

--
Crazy George
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"W5DXP" wrote in message
...
WB2JKX wrote:
It would seem that the use of repeaters on the HV lines would require
the
power line to be broken into isolated sections (RF-wise) where the
repeaters
are located, with the 60Hz bypassed around the repeater. This can't be
good
for reliable electric service.

The power companies have already been using power line carrier repeaters
for many, many years. The repeaters are the bypass, not vice versa.
--
73, Cecil http://www.qsl.net/w5dxp



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Dresser Industries I know--good customer.
SCADA, I have worked with for 40+ years, although we usually supplied our
own RF/microwave interconnectivity. Used to be a good use for the 900 meg
band before all this cell nonsense. I guess that applies to 2 GHz for the
past ten years also.
Low frequency carrier current is familiar to me, the office next door to
mine in Lynchburg in 1960 is where GE designed their carrier current
signalling equipment.

So, where are these "repeaters" you blithely cited the existence of? Power
line carrier is regularly discussed in Transmission and Distribution News as
well as other electric utility magazines, and I do not recall seeing any
reference to any equipment outside substations associated with carrier
current signaling. I submit that the isolation inductors alone qualify the
location as a substation anyway, nevermind the ceramic posts they call
coupling capacitors.

--
Crazy George
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"W5DXP" wrote in message
...
Crazy George wrote:
Manufacturer and model #?
Or location of one in South Texas?
Or URL for manufacturer of one?
Outside a sub-station, of course, which will be the requirement for BPL
repeaters, which will also have to be bi-directional.

When I worked for Dresser Industries in Houston in the 60's, some
of our SCADA systems sold to power companies operated over power
line carrier systems. As I remember, it operated on RF frequencies
below the AM broadcast band.

A web search for "Power Line Carrier" turned up 650,002 entries
including some for high speed internet access.
--
73, Cecil http://www.qsl.net/w5dxp



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"W5DXP" wrote in message
...
Crazy George wrote:
So, where are these "repeaters" you blithely cited the existence of?

They existed in the 60's. That's all I can tell you. After that, I became
100% digital at Intel Corp. Doesn't the present existence of 650K of web
pages involving "Power Line Carrier" count?

In a word, NO. Not worth the paper they aren't written on. Next week, I am
going to be doing some library research at a technical library, and I am
going to scan through the issues of IRE Transactions on Power Equipment, or
whatever the name was pre-IEEE, from 1950 to 1965 or so, and I'll get back
to you. I already know the answer, and I think so do you. For your part,
why don't you start a movement within IEEE to put their pre-1990
publications in their digital database?
--
Crazy George
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--
73, Cecil http://www.qsl.net/w5dxp



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Crazy George wrote:
Next week, I am
going to be doing some library research at a technical library, and I am
going to scan through the issues of IRE Transactions on Power Equipment, or
whatever the name was pre-IEEE, ...

It was the American Institute of Electrical Engineers although I chose to
join the Institute of Radio Engineers instead, for obvious reasons. :-)

... from 1950 to 1965 or so, and I'll get back
to you. I already know the answer, and I think so do you.

I assume 400 KHz Power Line Carrier is hardly anything like BPL which,
I assume, is a lot broader banded than that. Power companies use Power
Line Carrier equipment to control sub-stations from a central location.
They don't generally use it between the sub-station and residences so it
is usually not a problem for hams. But I have heard of power companies
using Power Line Carrier systems to read their meters under computer
control. Do you have any other specific questions? I'll try to dust off
my failing memory and answer them.
--
73, Cecil http://www.qsl.net/w5dxp



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