| Author |
Message |
John
Guest
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 Posted:
Fri Feb 11, 2005 6:11 am Post subject:
Re: Powerline modem |
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Peter wrote:
| Quote: | On Wed, 9 Feb 2005 14:43:24 +0000 (UTC), kensmith@green.rahul.net (Ken
Smith) wrote:
In article <i4uf01doft60n1f23rt4ep34kf7b8o5d6u@4ax.com>,
Jim Thompson <thegreatone@example.com> wrote:
[...]
(1) RF transmitter at your meter, "neighborhood" receiver located on a
pole, then connection to phone lines.
(2) Modem connection between your meter and *your* phone line. Power
company polls your modem.
I'll add:
(3) An RF responder that is pinged from a truck going down the street.
I know, some places use this for water meters, but I expect that someone
has done it for power meters.
It seems interesting that none of these technologies has made
significant inroads into meter reading for smaller customers. About
the only development that has been widely adopted is a hand held
computer to replace the meter reading book.
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Maybe where you live. Here the gas company reads the meter electronically
via radio as they drive down the street and similar story for the electricity
company.
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John Woodgate
Guest
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| Posted:
Fri Feb 11, 2005 12:35 pm Post subject:
Re: Powerline modem |
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I read in sci.electronics.design that John <john_t@no.spam> wrote (in
<420BF787.C5273F15@no.spam>) about 'Powerline modem', on Thu, 10 Feb
2005:
| Quote: | You forget that the power utilities aren't setting out to do this to
become Internet companies, they were looking for efficient ways to
communicate with their meters (and utility controlled thermostats).
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This can be done very well using frequencies below 150 kHz which don't
create huge EMI problems.
| Quote: |
Being able to offer and sell Internet broadband access is a nice side
effect of having the infrastructure.
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Not at any price; the emission levels 3 to 30 MHz are 60 dB or so above
those currently accepted. It's very far indeed from a marginal increase.
--
Regards, John Woodgate, OOO - Own Opinions Only.
The good news is that nothing is compulsory.
The bad news is that everything is prohibited.
http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk |
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Gary
Guest
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| Posted:
Sat Feb 12, 2005 8:01 am Post subject:
Re: Powerline modem |
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"Gireesh" <girishdml@gmail.com> wrote in message
news:eb0a9f46.0502070435.fa1870b@posting.google.com...
| Quote: | Hi all,
I'm engaged in designing a powerline modem. and i'm in search of a
perfect IC for that.
I found HCPL800J DAA with DSP56F801 PLM ?
Is there any one who worked on this ?
Can abnybody suggest me better ICs ?
I need a range of atleat 1 km and the application is Automatic meter
reading
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If you haven't already discovered it, there is a lot of helpful information
on the Freescale Semiconductor web page for the DSP568xx family. There are
a couple of brochures on power line modems and power meters implemented with
the DSP568xx family. This link is a good place to start:
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=DSP56F803
You may also want to contact your local Freescale representative, as they
can point you to more detailed information the implementation of power line
modems on the DSP568xx family.
-Gary
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