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???
12/04/08 22:18
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#160616 - DC? ... over a 10 kM line?
Responding to: ???'s previous message
I'd guess this will be an AC line, and having a 240-volt P-P signal imposed on a, say, 4.7 KV line will be a trick, but it's achievable and recoverable.

The U.S. power companies "read the meter" over their lines, so, though the voltages will differ, it must work quite well.

RE

List of 23 messages in thread
TopicAuthorDate
long distance communication            01/01/70 00:00      
   TelCo?            01/01/70 00:00      
      Contact ID?            01/01/70 00:00      
   more information would be helpful            01/01/70 00:00      
   Breif Explaination            01/01/70 00:00      
      is there local power at the "field switches" ?            01/01/70 00:00      
      INdustrial Data Comms Supplier            01/01/70 00:00      
         In North America            01/01/70 00:00      
         Another Industrial Data Comms Supplier            01/01/70 00:00      
      Too brief            01/01/70 00:00      
         re:            01/01/70 00:00      
            Suggestion            01/01/70 00:00      
               re:Andy Neil            01/01/70 00:00      
                  or with wifi            01/01/70 00:00      
            Past Experience            01/01/70 00:00      
            Serious warning            01/01/70 00:00      
      with PLC or rs-485            01/01/70 00:00      
      SHM ,LHM            01/01/70 00:00      
   It might interest you to know ...            01/01/70 00:00      
   There are ways but,            01/01/70 00:00      
      DC? ... over a 10 kM line?            01/01/70 00:00      
   I might suggest that you consider...            01/01/70 00:00      
      HART            01/01/70 00:00      

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