Originally Posted by wogggieee
How would the NAC codes be useful in scanning?
For most people, the NAC codes would not be useful for monitoring ARMER. With conventional P25 it can be useful to determine users, reduce interference, etc. Often times comparisons are made between PL/DPL on analog and NAC codes on P25.
Now some people have actually used NAC codes for monitoring ARMER buy getting a P25 radio, say a Motorola XTS2500 or XTS5000, and scanning the channels conventionally rather than trunk tracking them. I sort of doubt that would work very well, but to each his own.
I, on the other hand, decide to scan/search the 800 band in the P25 mode just to determine what NAC codes are being used. My understanding is that each sub-system uses a different NAC code. That way any active frequencies with NAC code 40D should be coming from the Ramsey County sub-system. In essence, among other things, it gives me another way to verify the frequencies being used on each sub-system.
It seems like every time I go through the process of re-confirming active frequencies, PL/DPL NAC codes, etc. I learn something. For example, I have the BCD996XT and I was using the Control Channel search routine and it is just sort of interesting to see that work again.
Another example is all of the various LTR systems. I have never spent alot of time listening to them, but it interesting. I also need to spend some more time on the "new" 7.5 kHz channels to see if any other new users are popping up there.
I was surprised, however, is finding BF0 and ED0 in the history log. What I incorrectly assumed is that any 800 mHz frequencies using Astro P25 modulation would be a part of the ARMER system. Upon further research I have found the following:
858.4875 NAC ED0 is a part of the City Of Eden Prairie P25 Trunked System
857.8875 NAC BF0 seems to be a conventional Astro P25 repeater to the Eden Prairie Independent School District 272