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Posted by Jim Thompson on February 9, 2005, 9:54 am
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On Wed, 09 Feb 2005 11:48:21 -0500, Spehro Pefhany
>On Wed, 09 Feb 2005 07:59:32 -0700, the renowned Jim Thompson
>
>>On Wed, 9 Feb 2005 14:43:24 +0000 (UTC), kensmith@green.rahul.net (Ken
>>Smith) 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.
>>>
>>>--
>>
>>I'm sure you can find other methods as well. This part of the
>>industry hasn't yet standardized. Everything still is in 'beta' ;-)
>>
>>In my neighborhood the "meter reader" plugs a hand-held device into
>>the meter and records the information, my bill is based on three
>>rates: off-peak, on-peak and peak demand.
>>
>> ...Jim Thompson
>
>http://www.gtiservices.org/amra/amra1/
>
>
>
>Best regards,
>Spehro Pefhany
I did some chip design work for a "modem-per-house" company that was
in (IIRC) Toronto. But they lost their funding before they got it
working.
BTW, if you haven't heard the news...
"PALO ALTO, Calif., Feb 09, 2005 (United Press International via
COMTEX) -- The chairman and chief executive of Hewlett-Packard Co. has
resigned suddenly in a dispute with the California company's board."
Good riddance, Carly ;-)
...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |
I love to cook with wine. Sometimes I even put it in the food.
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Posted by Rob Gaddi on February 9, 2005, 11:12 am
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Jim Thompson wrote:
>
> BTW, if you haven't heard the news...
>
> "PALO ALTO, Calif., Feb 09, 2005 (United Press International via
> COMTEX) -- The chairman and chief executive of Hewlett-Packard Co. has
> resigned suddenly in a dispute with the California company's board."
>
> Good riddance, Carly ;-)
>
> ...Jim Thompson
Ding dong, the wicked witch is dead. Now to see if I can't go
defibrillate my poor HP shares.
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Posted by Spehro Pefhany on February 9, 2005, 12:48 pm
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On Wed, 09 Feb 2005 11:12:43 -0600, the renowned Rob Gaddi
>Jim Thompson wrote:
>>
>> BTW, if you haven't heard the news...
>>
>> "PALO ALTO, Calif., Feb 09, 2005 (United Press International via
>> COMTEX) -- The chairman and chief executive of Hewlett-Packard Co. has
>> resigned suddenly in a dispute with the California company's board."
>>
>> Good riddance, Carly ;-)
>>
>> ...Jim Thompson
>
>Ding dong, the wicked witch is dead. Now to see if I can't go
>defibrillate my poor HP shares.
Don't count on it happening really fast:
"The uptick in Hewlett-Packard is purely because of market psychology
and will pass as the company still has the same mess in its hand and
doesn't have anyone to run the ship long term," said Cummins
Catherwood, managing director, Walnut Asset Management.
But given my experience with such experts, maybe the above is a 'buy'
signal.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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Posted by Peter on February 10, 2005, 10:00 am
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On Wed, 9 Feb 2005 14:43:24 +0000 (UTC), kensmith@green.rahul.net (Ken
Smith) 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.
There has been talk of these systems going hand in hand with demand
side management eg real time pricing, but efforts to reduce the cost
of these systems to a lever where they are worth adopting seem so far
to be without success.
The most successful niche seems to be a low bandwidth system for rural
areas (where meter reading costs are very high) which does not require
transformer bridging ( http://www.turtletech.com ).
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Posted by Peter on February 9, 2005, 2:29 am
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On Mon, 07 Feb 2005 23:00:32 GMT, Joerg
>Hello Rick,
>
>> If you have a EE PHD from MIT, go for it. Do you realize that the high
>> fequency transmission characteristics of most peoples "powerline"
>> changes constantly and essentially randomly? - RM
>
>
>For power metering it seems that the OP only needs a very narrow channel
>bandwidth. The challenge will be mostly in the analog and filter design
>arena but it can be done. Then, of course, there are the transformers
>that need to be bridged.
>
With very low channel width and appropriate signalling you do not need
to bridge transformers. However if complex tariffs are envisaged
there may be a need for transmitting up to 24 readings a day per meter
and this may be beyond such systems.
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