lundi 28 juillet 2014

P25 ARMER Questions

I should start out by saying that I am definitely a novice.



I've noticed a few things and developed questions because of those observations.



1.) Is the ARMER system a giant blanket of coverage? As an example, if a radio in a talk group half way across the state attempts to reach other radios in the talk group, must those radios be within range of the same site, or does ARMER provide a means for that information to be relayed to other sites where the rest of the talk group is present.



2.) I noticed that some sites are assigned various frequencies. For example the site near my residence has seven assigned frequencies. One is the primary control channel, and another is the secondary control channel. What are the other five for? Are these seven listed frequencies the frequencies upon which communication is actually taking place, or are these frequencies just used for the sake of letting the radios know which frequencies to switch over to in order to communicate?



3.) I pulled the FCC license for my county, in which the ARMER site resides... and the frequencies in the FCC listing don't match the frequencies for the ARMER site on the Radio Reference database. 1800 units were assigned frequencies in 300 unit blocks, for a total of six frequency blocks, and then six more frequencies were assigned to six individual repeaters... are these repeaters considered to be the ARMER "site" or is the site a single location, and the repeaters are acting in another capacity.



4.) Do the frequencies assigned to the 1800 handsets split into 6 blocks of frequencies get used for actually transmitting voice data, or do these frequencies just get used to communicate to the site, and then the site tells the radio which frequency to transmit over?



I've been looking everywhere for a really good overview of the state ARMER system, but so far I am just left with more questions than answers.



I'd really appreciate any help someone can offer making sense of this system.





Thanks,



Jared.




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