>> ... it may be a possiblility they may be using Nextel or Southern Linc. ... The 900 MHz listings for power companies in some areas are used for SCADA systems (data) ...
Although Progress Energy has power plant operations throughout the southeast U.S., their residential customer base is almost entirely in North Carolina and Florida. Southern Linc coverage is primarily in Georgia (and Alabama ?).
In both N.C. and Fl., Progress Energy uses 800 and 900 MHz Motorola trunking for its primary communications. The sites handle voice and data communications ... the latter includes work orders that can be printed off in the truck. I am not sure if PE uses any 900 MHz conventional frequencies for SCADA, but SCADA frequencies can be distinguished by the fact that the frequency is determined to 5 places to the right of the decimal point, and will end in a "5." The licenses will also have a fixed link designation ... FXO, FX1, FX2.**
Although the corporate name has been Progress Energy for awhile, many of the licenses still reflect the old names used in N.C. (Carolina Power and Light) and Florida (Florida Power and Light). Any FCC U.L.S. searches should be done under both the old and new company names.
Justy - it sounds like you are trying to listen to Progress Energy, but you are not using a trunking scanner. That takes alot of the fun out of monitoring a trunked system ... sort of like watching a ballgame. but no one has their name or number on their uniform. To borrow a Sampson County phrase, save up some money for a trunking scanner and you'll feel like you're in "Hogs Heaven."
But, since you mentioned you heard PE traffic on 936.500, I know you can hear the Clinton site. Here are the frequencies for that site:
935.950 936.500 938.925 939.4125 939.975
If you plug those five frequencies in your scanner, one of them will broadcast a continuous rat-tat-tat noise, which is the control channel. You can lock that frequency out, but if you hear the control data on another of the five frequencies, unlock the old frequency and lock out the new control frequency.
Two other sites that might be within your range are Goldsboro and Erwin. You might want to enter their frequencies, and listen for a control frequency for either site. The data stream is continuous ... if you don't hear it, you're not "hearing" the trunked site.
Goldsboro - 936.925 937.925 938.925 939.925
Erwin - 935.975 936.900 937.475 938.9875
The Erwin site also has a conventional repeater which could be used for unit-to-unit communications, as well as for making phone calls (phone interconnect).
Keep in mind that, typically, there will be very little voice traffic on any of the PE trunked frequencies, unless there is a major outage or severe weather. Alot of the communications between service trucks and dispatch is passed via data terminal.
PE has a pretty decent website, but their information on service coverage areas is limited. You might get an idea of where the service trucks for your area are dispatched out of by looking in the local phone book at the office addresses provided for PE.
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http://mrtmag.com/mag/radio_scada_systems_risk/index.html
The above is a link to a Mobile Radio Technology editorial that appeared earlier this year as the DHS began looking at the issue of SCADA vulnerability to terrorist (and other) attacks.
As utilities network with each other to share operating conditions and data (the regional power grids are a good example), the vulnerabilities of the SCADA system may provide the means for an attacker to penetrate multiple utilities via the least-secure provider.
Jeff Multer