OP25 Recon questions on a new Phase 2 TDMA P25 system

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mccleway

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Jun 10, 2009
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I've got a neighboring county that is putting in a Phase 2 TDMA P25 system, and I'm trying to do some recon on it so that I can update my equipment when I see traffic. I know the primary control channel is on 856.8125 MHz and I see that channel on the air (with OP25/RTL-SDR & on my BS536HP) broadcasting NAC 0x2c9. According to the info that I had, the system was supposed to be completed and the county would be cut over by the end of March 2020. The system is supposed to be majority non-encrypted traffic, but I'm not getting any hits on it at all. Right now I'm thinking that they have decided to hold off on transitioning during this time due to COVID-19, or I'm missing something in my monitoring. I still hear regular traffic on their old SmartNet system, so I'm leaning towards the first conclusion. Also, I can use the same setups to hear another neighboring counties Phase 1 P25 system with no issues.

tl;dr: Question- is there anything special I need to do in OP25 to monitor a new Phase 2/TDMA system?
 

boatbod

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Joined
Mar 3, 2007
Messages
2,960
Location
Talbot Co, MD
Make sure you're logging at "-v 1" and then any voice calls will be logged as follows:-
Code:
04/23/20 15:33:12.638164 voice update:  tg(11504), freq(773593750), slot(1), prio(3)
04/23/20 15:33:17.688128 voice update:  tg(11504), freq(773593750), slot(1), prio(3)
04/23/20 17:30:17.005498 voice update:  tg(11501), freq(773593750), slot(1), prio(1)
04/23/20 17:40:19.515398 voice update:  tg(11501), freq(771718750), slot(0), prio(1)
04/23/20 17:41:53.179041 voice update:  tg(11504), freq(771718750), slot(1), prio(3)
04/23/20 17:42:04.796820 voice update:  tg(11504), freq(771718750), slot(0), prio(3)
04/23/20 17:42:25.669933 voice update:  tg(11504), freq(771718750), slot(0), prio(3)
04/23/20 17:44:24.451474 voice update:  tg(11504), freq(771718750), slot(1), prio(3)
04/23/20 17:56:42.140575 voice update:  tg(11504), freq(773593750), slot(1), prio(3)
04/23/20 17:56:48.013277 voice update:  tg(11504), freq(773593750), slot(1), prio(3)
04/23/20 17:56:54.021630 voice update:  tg(11504), freq(773593750), slot(0), prio(3)
04/23/20 17:57:39.764181 voice update:  tg(11504), freq(773593750), slot(1), prio(3)
04/23/20 17:57:48.638514 voice update:  tg(11504), freq(771718750), slot(1), prio(3)
04/23/20 17:57:53.549266 voice update:  tg(11504), freq(773593750), slot(0), prio(3)
04/23/20 17:58:08.989335 voice update:  tg(11504), freq(771718750), slot(1), prio(3)
04/23/20 17:58:22.830058 voice update:  tg(11504), freq(771718750), slot(0), prio(3)
04/23/20 17:59:02.091787 voice update:  tg(7616), freq(773593750), slot(0), prio(2)
04/23/20 17:59:07.139534 voice update:  tg(7616), freq(771718750), slot(1), prio(2)
04/23/20 17:59:19.701080 voice update:  tg(7616), freq(771718750), slot(0), prio(2)
04/23/20 17:59:37.592059 voice update:  tg(7616), freq(771718750), slot(1), prio(2)
 
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