Scanning Trunking in Auckland

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A bit of info about monitoring trunking systems

Control Channel: This is a data channel which is used to tell mobiles which channel to switch to to pass their traffic. The data channel is transmitting continuously and all mobiles listen to this channel until they receive an instruction to switch to a traffic channel to receive a call. Some systems always use the same frequency for the control channel, while others rotate the control channel around the available channels. (This evens out the wear and tear on the equipment since the control channel is operating 100% of the time !!). For example the Team Talk Fleetlink system keeps the same control channel all the time, while Motorola Smartnet may have up to four channels which are used as the control channel on some days and as traffic channels on other days.

Traffic channels: These are the channels used for voice or data traffic between mobiles. At the start of each conversation a free channel is allocated to the user by the system, and both the transmitting and receiving users are instructed to change to that channel for the duration of the conversation. Once complete, the users revert to monityring the control channel and the traffic channel is then available for someone else to use. The number of traffic channels depends on how many users are on the system.

Logical Channel Number (LCN): This is a channel number system which is used by the network to tell users what frequency to move to for traffic. The LCN allows the software to calculate what frequency to switch to.

The LCN is calculated as follows: Each system has a base frequency. (This is a starting point for calculating the operating frequency). The frequency of an operating channel is the base frequency, plus the LCN multiplied by the channel spacing. For example, The Team Talk MPT1327 system uses a base frequency of 414MHz. The channels in the TD band are spaced at 12.5kHz (or .0125 MHz) intervals. LCN 10 is therefore 414 MHz, plus .0125MHz multiplied by 10. 414 +(.0125x10) = 414.125MHz

Analogue and Digital systems Analogue trunked systems use standard FM for the voice channels. As long as you have software to control your receiver the traffic can be monitored just like conventional FM. Digital trunked systems work in generally the same way but use digital modulation formats which require specialised receivers to monitor. Current digital systems in use in Auckland are:

APCO P25 – systems operated by Team Talk and NZ Police. Unencrypted P25 systems can be monitored using P25 capable receivers.

DMR – Digital Mobile Radio - this is an open source digital format.

TETRA (Terrestrial Trunked Radio) This is a slightly different format in that instead of assigning different frequencies to the users for their traffic, it assigns time slots. So instead of traffic being transmitted simultaneously on different frequencies, it is transmitted sequentially with each user being allocated a specific interval after which the next person transmits their data etc. So there may be four different conversations taking place on a single frequency – user 1 transmits in the first 250 milliseconds, user two in the second 250ms, user 3 in the third, user 4 in the fourth, and then back to user 1 etc. This is called Time Division Multiple Access (TDMA). – Conventional trunking using discrete frequencies is called Frequency Division Multiple Access (FDMA).

Monitoring Trunked systems. Even if you don’t have a specialised scanner with trunking capability it is possible to monitor trunked systems without too much effort. Free software such as Trunkview and Unitrunker is available and can be used with either normal scanners that have facilities for computer control, or alternatively you could use Unitrunker and a couple of $20 RTL2832 software defined radio “dongles”, (one to monitor the control channel data and the other to monitor the traffic channels under software control). (search Trade Me for RTL2832).

More Info here.


TETRA Digital

(Currently available scanners are unable to decode this system. Submitted for interest only so you can identify what signals you are hearing)

Kordia "KorKor" Redoubt Road

Freq          Type

863.7375      TDMA Data
858.7375      TDMA Data
858.2375      TDMA Data

Kordia "KorKor"Bombay

858.2875      TDMA Data
859.2125      TDMA Data
858.0375      TDMA Data

Kordia "KorKor"Britomart Station

858.7375      TDMA Data
858.2375      TDMA Data

Kordia "KorKor"Eden House

859.9375      TDMA Data
858.8625      TDMA Data
858.3625      TDMA Data

Kordia "KorKor"Manukau

858.2125      TDMA Data
858.8125      TDMA Data

Kordia "KorKor"Remuera

858.9125      TDMA Data
858.4125      TDMA Data


Kordia "KorKor"Skytower

858.5625      TDMA Data
858.0625      TDMA Data
858.3125      TDMA Data
863.7625      TDMA Data

Kordia "KorKor"Waiatarua

858.3375      TDMA Data
858.0875      TDMA Data
861.3375      TDMA Data

Motorola Smartnet Analogue

Ports of Auckland Ltd System ID 6E3B

Freq        LCN    

859.1375    325    
860.1375    365    
861.1375    405    Control
862.1375    445    Control
862.6375    465    
863.1375    485    

Identified Talkgroups:
49200 = Container Terminal control
		

NEXCOM (Antares Communications Ltd) Skytower System ID 2F1D

Freq        LCN    

856.6625    226
859.3875    335    
859.8875    355    
860.3875    375    
860.8875    395    Control
861.5875    423   
861.8875    435    Control
863.3875    495    
863.8875    515
866.9875    639
869.3875    735
    

Identified Talkgroups:

Talkgroup ID    Talkgroup User
Decimal	Hex	
1968	07B0	Hotel
10064	2750	Restaurant
9040	2350	Security
13648	3550	Security
13680	3570	Security
9232	2410	Sky City Casino
9264	2430	Sky City Casino
10192	27D0	Sky City Casino "chan 3"
9392	24B0	Sky City Casino "chan 6"
9104	2390	Sky City Casino Gaming Floor
9456	24F0	Sky City Casino VIP rooms
9520	2530	Sky City Event Management
9616	2590	Sky City Maintenance
4976	1370	Surf Lifesaving Northern Region (Surfcomm)
8080	1F90	Waste Management bin trucks

		

NETCOM Services Mt Puketutu System ID 4602

Freq        LCN    

859.0375    321    Control
859.5370    341    
860.0375    361    
860.5375    381    
861.0375    401    
861.5125    420    
863.0375    481    
863.5375    501

Talkgroups:

9616
9648
9712
10544
10736
12400
12560
45168
		

NETCOM Services Auckland Airport System ID ID 4602

Freq        LCN    

859.6625    346   
860.6625    386   Control
861.6625    426
862.6625    466 
863.6625    506

Teamtalk Skytower System ID 8330

Freq        LCN    

859.18750   357
860.18750   367
861.18750   407    Control
863.18750   487

		


APCO P25 Digital

Unencrypted APCO P25 can be decoded using a suitable scanner. For encrypted P25 only the control signals can be decoded.

Team Talk Skytower Site ID 00003-00

System ID             : 002
System Name           : 
WACN                  : 00003
Tower Number (Decimal): 1-2
Tower Number (Hex)    : T0102

Freq          Type     Channel

855.35000     Control  00-0028
855.37500     Control  00-0030
856.60000     Voice    00-0128
857.17500     Voice    00-0174
859.56250     Control  00-0365
860.56250              00-0445
863.56250              00-0685


DMR Digital

Skycom Ltd(Skytower)

418.2500   Control Chan

DMR Trunking

Antares Communications LTD. System ID 214 Connect Plus Trunking

Site 1 Skytower

CON+,  214,  1,  1,  863.09375,  0.00,  0 ;CC
CON+,  214,  1,  2,  863.09375,  0.00,  0
CON+,  214,  1,  3,  862.09500,  0.00,  0 ;CC ALT
CON+,  214,  1,  4,  862.09500,  0.00,  0
CON+,  214,  1,  5,  859.59375,  0.00,  0
CON+,  214,  1,  6,  859.59375,  0.00,  0
CON+,  214,  1,  7,  860.09375,  0.00,  0
CON+,  214,  1,  8,  860.09375,  0.00,  0
CON+,  214,  1,  9,  859.09375,  0.00,  0
CON+,  214,  1,  10, 859.09375,  0.00,  0
CON+,  214,  1,  11,
CON+,  214,  1,  12,
CON+,  214,  1,  13,
CON+,  214,  1,  14,
CON+,  214,  1,  15,
CON+,  214,  1,  16,
CON+,  214,  1,  17,
CON+,  214,  1,  18,
CON+,  214,  1,  19, 859.59375, 0.00, 0
CON+,  214,  1,  20, 859.59375, 0.00, 0
First 10 voice channels mapped. Still trying to find the last 10 voice channels



Talkgroups


3, 
5, 
100,
103,
200,
300,
400,
401,
501,
701,
702,
1101,
1201,
1209,
1210,
1211,
1212,
1213,
1214,
1217, 
1301, "BAGGAGE HANDLERS"
1302, 
1303, 
1304, 
1405,
1501, "AKL DOMESTIC AIRPORT"
1502,
1601,
1801,
2001, 
2101,
2440,
2501,
2502,
2503,
2504,
2506,
2507,
2888,
3101,
3201,
3301,
3701,
3801,
3901,
4001,
4201,
4301,
4401, "SECURITY ENC"
4402,
4404,
4601,
4701,
4801,
4902,
4903,
5501,
5701,
5702,
6601,
6701,
34001,

DMR TIII trunking.

Copy paste into your DSD+ frequencies list.

Push Wireless

Talkgroups:

6102

Site: H1-1.1 DCC:0 

; TIII,1.1

TIII, 1, 1.1, 681, 418.25000,  410.2500, 0 ;CC
TIII, 1, 1.1, 682, 418.25000,  410.2500, 0
TIII, 1, 1.1, 721, 418.50000,  410.5000, 0
TIII, 1, 1.1, 722, 418.50000,  410.5000, 0
TIII, 1, 1.1, 761, 418.75000,  410.7500, 0
TIII, 1, 1.1, 762, 418.75000,  410.7500, 0
TIII, 1, 1.1, 841, 419.25000,  411.2500, 0
TIII, 1, 1.1, 842, 419.25000,  411.2500, 0

Site: H1-1.2 DCC:0

; TIII,1.2

TIII, 1, 1.2, , 418.27500,  410.27500, 0 ;CC


MPT1327 Analogue

Team Talk Fleetlink Site ID 4361 (Skytower)

Freq    	LCN	Type
414.1500	12	Traffic
414.2875	23	Traffic
414.4000	32	Traffic
414.5375	43	Traffic
414.6500	52	Traffic
414.7875	63	Traffic
414.9000	72	Traffic
415.0375	83	Traffic
415.1500	92	Traffic
415.2875	103	Traffic
415.4000	112	Traffic
415.5375	123	Control
415.6500	132	Traffic
415.7875	143	Traffic
415.9000	152	Traffic
416.0375	163	Traffic
416.1500	172	Traffic
416.2875	183	Traffic
416.5375	203	Traffic
417.9875	319	Traffic

Team Talk Fleetlink Site ID 4341 (Skytower)

Freq    	LCN	Type
417.7625	301	Control


Team Talk Fleetlink Site ID 4201 (Skytower)

Freq    	LCN	Type
416.5625	205	Control

Team Talk Fleetlink Site ID 4221 (Torbay)

Freq    	LCN	Type
415.7500        140	Control

Team Talk Fleetlink Site ID 42C1 (Quinns Road)

Freq    	LCN	Type
416.6750	214	Control

Team Talk Fleetlink Site ID 43E1 (Skytower)

Freq    	LCN	Type
417.7875	303	Control

Team Talk Fleetlink Site ID 49E1 (Manurewa)

Freq    	LCN	Type
417.8375	307	Control

Team Talk Fleetlink Site ID 4CE1 (Manurewa)

Freq	       LCN	Type

414.1375	11	Traffic
414.3875	31	Traffic
414.6375	51	Traffic
414.8875	71	Traffic
415.1375	91	Traffic
415.3875	111	Traffic
415.5875	127	Control
415.8875	151	Traffic
416.1375	171	Traffic
416.4125	193	Traffic


Team Talk ActionNet Site ID 5089 (Moir Hill)

Freq    	LCN	Type
414.3500	28	Control

Team Talk ActionNet Site ID 50C9 (Torbay)

Freq    	LCN	Type
417.8500        308	Control

Team Talk ActionNet Site ID 5109 (Waiatarua)

Freq    	LCN	Type
414.2750        22	Control
414.4750        38      Control

Team Talk ActionNet Site ID 5149 (Skytower)

Freq	        LCN	Type
414.7125	57	Traffic
414.9625	77	Traffic
415.4625	117	Traffic
415.7125	137	Control
416.2250	178	Traffic
416.4750	198	Traffic
416.7375	219	Control
416.9750	238	Traffic
417.2250	258	Traffic
417.4750	278	Traffic
417.7250	298	Traffic

Team Talk ActionNet Site ID 5189 (Redoubt Road)

Freq    	LCN	Type
415.7000        136     Traffic
417.9625        317	Control

Team Talk ActionNet Site ID 51C9 (Bombay)

Freq	        LCN	Type
414.48750	39	Traffic
414.73750	59	Traffic
414.98750	79	Traffic
415.73750	139	Control
415.98750	159	Traffic
416.57500	206	Traffic
417.07500	246	Traffic
418.01250	321	Traffic