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Originally Posted by opticalc
Im trying to wrap my head around the database...
An example:
In Alabama, Dallas County is listed as being part of the State of Alabama EDACS system. But when I click on that system to get info, there are no cities/sites from Dallas County listed with any frequencies.
Now, supposing that I did live in Jefferson County, in Birmingham, there are some freqs listed there as site 003. But none of those freqs are red/blue. All the freqs for site 003 are black, so im assuming that those freqs are for the actual FM audio?
But doesnt each site HAVE to have towers with control channels???
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Yes, they do, BUT for an EDACS system the control channels are really a mute point. EDACS, unlike Motorla, requires that all the frequencies be entered and that the frequencies be entered in LCN (Logical Channel Number) order.
What you are seeing for the Alabama State system are the districts covered by specific sites. Find the district(s) closest to Dallas county and load them into your scanner. How to load an EDACS system varies from scanner to scanner, so read your instructions there.
The LCN number is included in the RR DB as the light grey number next to the frequency.
Using your example so you can see the difference between an EDACS and a Motorla system, take a look at the Huntsville (Madison county, actually, you'll need to go to the list of trunked systems for AL and select Huntsville's public safety, the map is not working for Madison county). You will see that Huntsville has twenty frequencies, but only four are shown as control channels. Also note the lack of the greyed numbers to the left of the frequency.
Where you see a specific control channel on an EDACS system, it could be that this is the only channel used for control, or it was the channel active when the information was submitted.