Motorola | BC796D | Monitoring the Wake County Trunked Radio System

Monitoring
the
Wake County
Trunked Radio System
Produced by:
Wake County Public Safety
919-856-6480
Version 2.3
November, 2005
Table of Contents
Introduction
3
Basic Explanation
4
Equipment Needed to Monitor
5
Frequencies and Talk groups
12
How to program equipment to monitor WCTRS
15
Glossary of Terms
17
Acknowledgements
19
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Introduction
Wake County North Carolina is implementing a Motorola, 800 MHz 4.1 SmartZoneTM trunked
radio system. This system will support both analog and digital voice modes. The system is
designed to expand the existing North Carolina State Highway Patrol (NCSHP) system,
significantly improving interoperability between all local, county and state public safety agencies
in Wake County.
"This radio system represents a massive improvement in emergency radio communications in
Wake County," said Wake County's Public Safety Director John Rukavina. "Our fire, EMS and
law enforcement agencies are eager to move from outdated VHF/UHF technology that cannot
grow with Wake County. Additionally, our partnership with the State Highway Patrol will
enhance interoperability and provide additional opportunities for use of new technology."
The new, shared system will add one simulcast and three INTELLIREPEATERTM subsystems to
the existing NCSHP SmartZone trunked system providing reliable wide area coverage throughout
Wake County's 12 municipalities, including the state capital of Raleigh. Seven trunked Radio
Frequency (RF) sites in the system will contain 14 channels operating in a simulcast mode.
"Our primary goal with creating this system was to eliminate the coverage problems that
continued to plague our aging legacy communications systems and improve all facets of
emergency management," said Emergency Management Director for Wake County, Martin
Chriscoe. "The system will significantly impact our ability to respond quickly and efficiently to
large incidents in the area, but also smaller daily incidents that require a multiple agency
response."
The Wake County Trunked Radio System (WCTRS) uses new digital technology that cannot be
monitored with traditional radio scanners. Many individuals and organizations have a vested
interest in monitoring the traffic on the WCTRS. These include:
Off duty law enforcement, fire, and EMS personnel.
Family members law enforcement, fire, and EMS personnel.
Volunteers that support law enforcement, fire, and EMS organizations.
Newspaper, TV and radio media.
Tow truck operators.
Amateur radio operators involved with SKYWARN spotter missions.
This guideline was developed to provide concise information on how to monitor the new digital
Wake County Trunked Radio System.
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How the System Operates
Trunked radio systems utilize techniques to allow multiple users on a limited number of voice or
traffic channels. Trunked systems incorporate control functions to manage larger volumes of
traffic and work off of the principle that not all users will utilize system resources all at one time.
This, however, means that you have to control what resources are allocated, and in what priority
for the various users. We need to remember that control messages are already utilized in some
form by many conventional mobile communication systems. The simple voice statement "over"
on a conventional analog two-way channel indicates to another user that the previous user is done
talking and the system is now available for use by a different user. Within more advanced
systems, control messages are exchanged as sub-audible tones that control access to the channel
and specific functions of the radio communication.
Simplex operation means that the radio uses the same frequency to transmit and receive. This
means that only one user can be talking at one time. If both "key up" at the same time, then the
users will not be able to understand each other because neither will be receiving, as they will both
be transmitting. Some systems provide control signaling along with the voice transmission that
provides a level of intelligence that avoids these kinds of conflicts.
Duplex operation allows users to carry on a conversation much in the same way we use a regular
telephone. Separate RF paths are assigned for the transmitter and receiver. This allows both
parties to talk and listen simultaneously. (Except in the case of halfduplex). Let's compare
simplex and duplex operation to trunked radio operation. With trunked radio operation, there is a
base site or repeater that coordinates the communication between the various mobile units
through the use of a control channel. This dedicated control channel provides the additional
management of the system resources. In effect, it is acting as an "overseer" of the network and
controls who can use the system, when they can use it and how they can use it. Usually, the
control channel is a separate frequency channel that is designated as the dedicated control channel
frequency and is different from the voice channels. Since the control channel is communicating
in digital "words", the modulation has to support digital "1s" and "0s" to accomplish the transfer
of data. Using a dedicated control channel is desirable in that it provides additional control of
spectrum in larger systems. It allows for the control of system resources and offers added features
not available in conventional radio communications.
The Wake County Trunk Radio System (WCTRS) is a SmartZone Type II trunk system marketed
by Motorola under the ASTRO name. All of these systems operate in a 12.5 kHz bandwidth
(Narrowband Operation). Motorola Type II systems refer to the second generation Motorola
Trunking systems that replaced Fleets and Subfleets with the concept of talkgroups and individual
radio IDs. ASTRO is the trademark name for Motorola's Digital Communications Solution. The
original Motorola ASTRO implementation uses the standard SmartZone 3600-baud data channel
and the digital voice solution is based on the common air IMBE (Improved Multiband Excitation)
vocoder. The WCTRS can support up to 28 channels, 65535 unique radio IDs and 4000
talkgroups.
The WCTRS operates from seven (7) main sites located through out the county. For monitoring
purposes all of these sites simulcast the control channel and repeater channels. This provides
continuous coverage over all of Wake County.
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Equipment Required for Monitoring
The WCTRS is a digital trunk radio system. Currently there are only three (3) scanners on the
market that will track and decode the WCTRS. These scanners are very new to the market and
represent first and second generation technology.
Uniden American Corporation
○1 BC296D - APCO P-25 Digital Handheld Scanner
The BC296D Digital Handheld Scanner is APCO P-25 Capable with 1000 channels, 10 banks, 10
priority channels and continuous band coverage.
PRODUCT FEATURE LIST
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APCO P-25 Digital Operation - Including 9600 Baud C4FM & CQPSK
PC Control/Programming (Software Included)
1000 Channels, 10 Banks, 10 Priority Channels
Continuous Band Coverage - 25MHz to 1.3GHz
Preprogramed Service Searches (12)
TrunkTracker IV - EDACS®, Motorola®, LTR, APCO
CTCSS/DCS Decode
S.A.M.E. Weather Alert - Specific Area Message Encoding - During a NOAA Weather
or Emergency Alert, a code for your specific location will alert you to severe conditions
in your immediate area.
Alpha Tagging - Bank Channel and Search Range
Backlit Keypad - Offers you added visibility for dialing at night or in low light.
Holographic Backlit LCD Display
Street Price $525.00
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○2 BC796D - APCO P-25 Digital Scanner
The BC796D Digital Scanner is APCO P-25 Capable with 1000 channels, 10 banks, 10 priority
channels and continuous band coverage.
PRODUCT FEATURE LIST
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APCO P-25 Digital Operation - Including 9600 Baud C4FM & CQPSK
PC Control/Programming (Software Included)
1000 Channels, 10 Banks, 10 Priority Channels
Continuous Band Coverage - 25MHz to 1.3GHz
Preprogramed Service Searches (12)
TrunkTracker IV - EDACS®, Motorola®, LTR, APCO
CTCSS/DCS Decode
S.A.M.E. Weather Alert - Specific Area Message Encoding - During a NOAA Weather
or Emergency Alert, a code for your specific location will alert you to severe conditions
in your immediate area.
Alpha Tagging - Bank Channel and Search Range
Backlit Keypad - Offers you added visibility for dialing at night or in low light.
Street Price $525.00
Uniden is currently offering a first generation model of the above radios. The BC250D APCO P25 Capable Handheld Scanner and the BC785D APCO P-25 Capable Scanner are available in the
market place. Both of these radios are “digital ready”. This means that in order to monitor all
WCTRS in digital mode the optional BCi25D Digital Card is required. Additionally, the BCi25D
Digital Card will only track 3600 baud systems. The WCTRS is a 3600 baud system so these
radios could be used. However, for propose of this Guideline these radios were not
recommended for two reasons, cost and functions. The combined cost of the BC250D/BCi25D or
BC785D/BCi25D is greater than the BC296D or BC796D. While both sets of these radios look
the same Uniden has made some improvements in the internal operation of the BC296D and
BC796D.
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Where to buy the Uniden BC296D - APCO P-25 Digital Handheld Scanner and
BC796D - APCO P-25 Digital Scanner
Over the Internet at:
Communications Electronics Inc.
254 Wagner Road South
Ann Arbor, Michigan 48103-1940 USA
800-USA-SCAN or 734-996-8888
www.usascan.com
Scanners Unlimited
1199A Laurel Street,
San Carlos, CA 94070
650-573-1624
www.scannersunlimited.com
Scanner World, USA
17 Interstate Ave.
Albany, NY 12205
800-476-8050 or 518-436-9606
www.scannerworld.com
Scanner Master Corporation
40 Freeman Place
Needham, MA 02492
800-SCANNER or 781-292-1010
www.scannermaster.com
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○3 Radio Shack Corporation PRO-96 Digital Trunking Handheld Scanner
This handheld scanner has an abundant memory capacity, able to store frequencies in 5500
memory channels. Plus, you can store up to 16,500 ID codes in one "working" 500 channel, 1500
ID code scanner with 11 "virtual" scanner pages of memory! This scanner follows APCO 25
digital and virtually all analog Motorola® and GE/Ericsson EDACS trunked systems. More and
more cities are using these trunked systems, allowing city services to share the same set of
frequencies. Conversations on these systems start on one frequency, then shift to a different one
with each transmission. This scanner can follow these systems. Patent Pending.
PRODUCT FEATURE LIST
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APCO 25 digital trunking including the newer systems using a 9600bps control channel
Follows analog Motorola I, II, I/II and GE/Ericsson (EDACS) trunked radio systems
It's preprogrammed with the most often-requested systems—if you live in a major metro
area, your city's system is probably already loaded
Expanded frequency coverage picks up local marine, police/fire, HAM, VHF-air, racing,
CB, weather, FRS/GMRS/MURS and virtually every other popular scanner frequency as
well
FM/AM mode
SAME (FIPS) weather alert
Backlit display and keypad
Channel scan
Alpha display can show name of service
Continuous Tone Controlled Selective Squelch (CTCSS) and Digital Coded Squelch
(DCS) decoding
TCXO for frequency stability; designed for new 6.25KHz channel spacing
Frequency coverage: 25-54, 108-136.9875, 137-174, 216.0025-225, 406-512, 806960MHz (except cellular), 1240-1300MHz
PC interface
Requires 4 “AA” batteries, not included
Street Price $499.99
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Radio Shack Catalog #: 20-283 800MHz Scanner Antenna
Recommended for use with both brands of scanners
Designed specifically for 800MHz reception, this RadioShack Scanner Antenna is ideal for
monitoring 800MHz trunked radio systems used by police, fire and emergency services.
Features:
• Compact—only 7” in height
• Male BNC connector
Street Price $14.99
Where to buy the Radio Shack PRO-96 Digital Trunking Handheld Scanner
Local Radio Shack Stores in Wake County:
WCPS
Raleigh
350 E Six Forks Rd
Raleigh, NC 27609
919-835-1430
Garner
1474 Garner Station Blvd
Raleigh, NC 27603
919-772-6696
Raleigh
Capital Square
3133 Capital Boulevard
Raleigh, NC 27604
919-876-5965
Raleigh
Crab Tree Valley Mall
4325 Glenwood Ave
Raleigh, NC 27612
919-782-6028
Raleigh
Wilders Grove Shop Center
4111 New Bern Ave #127
Raleigh, NC 27610
919-231-6139
Raleigh
Mini City
4554 Capital Blvd
Raleigh, NC 27604
919-876-8775
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Raleigh
Falls Village Shop Center
6643 Falls of the Neuse Rd.
Raleigh, NC 27615
919-847-1489
Raleigh
Stonehenge Market
7432 Creedmoor Rd
Raleigh, NC 27613
919-847-9526
Cary
Crossroads Plaza
419 Crossroads Blvd
Cary, NC 27511
919-851-0332
Raleigh
9660 Falls of Neuse Rd., Suite 165
Raleigh, NC 27615
919-841-1305
Raleigh
Triangle Town Center
5959 Triangle Town Blvd
Raleigh, NC 27616
919-792-2051
Morrisville
Park Place
9557 Chapel Hill Rd
Morrisville, NC 27560
919-469-4795
Cary
Cary Towne Center
1105 Walnut Street
Cary, NC 27511
919-467-1879
Fuquay Varina
Main Street Station
1009 E Broad St
Fuquay Varina, NC 27526
919-567-9986
Over the Internet At:
www.RadioShack.com
Scanners Unlimited
1199A Laurel Street,
San Carlos, CA 94070
650-573-1624
www.scannersunlimited.com
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WCTRS
Frequencies and Talk groups
The WCTRS operates from seven (7) main sites located through out the county. For monitoring
purposes all of these sites simulcast the control channel and repeater channels. This provides
continuous coverage over all of Wake County.
To monitor the WCTRS, program the frequencies in Table 1 into your scanner. The WCTRS is
currently active on about half of the allocated frequencies. As the system traffic increases more of
the frequencies will be activated.
ACTIVE FREQUENCIES
866.2000 MHz
Active
866.2625 MHz
Active
866.4625 MHz
Active
866.6250 MHz
Active
866.7625 MHz
Active
866.9625 MHz
Active
867.1500 MHz
Active
867.2625 MHz
Active
867.7875 MHz
Active
867.9625 MHz
Active
868.1500 MHz
Active
868.5375 MHz
Active
868.5625 MHz
Active Control Channel
868.7875 MHz
Active Control Channel
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Talk groups are “channels” that are assigned to agencies for specific uses. The scanner can be
configured to “scan” lists of talk groups or hold on one. The tables 2-4 list talk groups for the
various agencies using the WCTRS.
Talk Group ID #
33088
32816
32832
34000
33984
36640
32848
32864
32880
32896
32912
32928
32944
32960
33152
33168
33184
33200
32976
32992
33008
33024
33216
33232
33248
33264
33280
33296
33312
33328
33344
33360
33376
33392
33408
33424
33440
33456
33488
WCPS
Wake County Fire
Alpha Tag
Description
FIRE ALERT
Fire Alert
FIRE DISP 1
Fire Dispatch 1
FIRE DISP 2
Fire Dispatch 2
RFD ALERT
Raleigh Fire Alert
HQ DISP
RFD Headquarters
APEX DISP 1
APEX Fire Dispatch
FIRE OPS 1
Fire Operations 1
FIRE OPS 2
Fire Operations 2
FIRE OPS 3
Fire Operations 3
FIRE OPS 4
Fire Operations 4
FIRE OPS 5
Fire Operations 5
FIRE OPS 6
Fire Operations 6
FIRE OPS 7
Fire Operations 7
FIRE OPS 8
Fire Operations 8
FIRE OPS 9
Fire Operations 9
FIRE OPS 10
Fire Operations 10
FIRE OPS 11
Fire Operations 11
FIRE OPS 12
Fire Operations 12
FIRE NORTH
Fire North
FIRE SOUTH
Fire South
FIRE EAST
Fire East
FIRE WEST
Fire West
P S TAC 13
Public Safety Tac 13
P S TAC 14
Public Safety Tac 14
P S TAC 15
Public Safety Tac 15
P S TAC 16
Public Safety Tac 16
P S TAC 17
Public Safety Tac 17
P S TAC 18
Public Safety Tac 18
P S TAC 19
Public Safety Tac 19
P S TAC 20
Public Safety Tac 20
P S TAC 21
Public Safety Tac 21
P S TAC 22
Public Safety Tac 22
P S TAC 23
Public Safety Tac 23
P S TAC 24
Public Safety Tac 24
P S TAC 25
Public Safety Tac 25
P S TAC 26
Public Safety Tac 26
P S TAC 27
Public Safety Tac 27
P S TAC 28
Public Safety Tac 28
P S TAC 29
Public Safety Tac 29
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33504
33520
33536
33552
33568
33584
33888
33904
33920
33936
P S TAC
P S TAC
P S TAC
P S TAC
P S TAC
P S TAC
P S TAC
P S TAC
P S TAC
P S TAC
Talk Group ID #
35168
34416
34432
34448
34464
34480
34496
34800
34816
34832
34848
34864
Talk Group ID #
32016
32032
32048
32064
32112
32128
32144
32160
32176
32496
32512
32192
32208
32224
32240
32256
32272
WCPS
30
31
32
33
34
35
36
37
38
39
Public Safety Tac 30
Public Safety Tac 31
Public Safety Tac 32
Public Safety Tac 33
Public Safety Tac 34
Public Safety Tac 35
Public Safety Tac 36
Public Safety Tac 37
Public Safety Tac 38
Public Safety Tac 39
Wake County EMS
Alpha Tag
Description
EMS ALERT
EMS Alert
EMS DISP 1
EMS Dispatch #1
EMS DISP 2
EMS Dispatch 2
EMS OPS 1
EMS Ops 1
EMS OPS 2
EMS Ops 2
EMS OPS 3
EMS Ops 3
EMS OPS 4
EMS Ops 4
ADMIN - CITY
EMS Admin - City
ADMIN - NORTH EMS Admin - North
ADMIN - SOUTH EMS Admin - South
ADMIN - EAST
EMS Admin - East
ADMIN - WEST
EMS Admin - West
Wake County Sheriff Department
Alpha Tag
Description
WSODISP1
WSO Disp-Emer&Disp
WSODISP2
WSO Disp-Traffic
WSODISP3
WSO Disp-Check Out Ch
WSODISP4
WSO Disp-Emer Alt
WSOPAT1
WSO Patrol Event 1
WSOPAT2
WSO Patrol Event 2
WSOPAT3
WSO Patrol Event 3
WSOPAT4
WSO Patrol Event 4
WSOSRO1
WSO School Resource Offcr
WSOWAR
WSO Patrol Warrant Sqd
WSOTRANS
WSO Transport
WSOSRT1
WSO Patrol SRT-Entry
WSOSRT2
WSO Patrol SRT-Negotiator
WSOSRT3
WSO Patrol SRT-Ops
WSOCID1
WSO CID 1
WSOCID2
WSO CID 2
WSOCID3
WSO CID 3
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32288
32304
32320
32336
32352
25712
32384
32400
32416
32432
32624
25616
32448
32480
Talk Group ID #
35200
35216
35232
35248
35264
35312
35328
35344
35664
35648
35632
WCPS
WSODV1
WSODV2
WSODV3
WSOJUD1
WSOJUD2
WSOCOURTS
WSOMOP1
WSOMOP2
WSOMOP3
WSOMOP4
WSODET1
WSODET2
WSODET3
WSO TRAIN
WSO CID 4-D&V
WSO CID 5-D&V
WSO CID 6-D&V
WSO Judic Svc-Field
WSO Judic Svc-Field
WSO Judic Svc-Courts
WSO Mutual Ops 1-Future
WSO Mutual Ops 2-Future
WSO Mutual Ops 3-Future
WSO Mutual Ops 4-Future
WSO Detention 1-PSC
WSO Detention 2-Hammond
WSO Detention 3-Transport
WSO Admin Training
Fuquay-Varina
Alpha Tag
Description
FV_DISP
Fuquay-Varina PD Disp1
FV_PAT1
Fuquay-Varina PD Patrol 1
FV_TRAF1
Fuquay-Varina PD Traffic 1
FV_IVES1
Fuquay-Varina PD Invest 1
FV_CA1
Fuquay-Varina PD Comm Aff 1
FV_PAT2
Fuquay-Varina PD Patrol 2
FV_IVES2
Fuquay-Varina PD Invest 2
FV_CA2
Fuquay-Varina PD Comm Aff 2
FV_PAT3
Fuquay-Varina PD Patrol 3
FV_IVES3
Fuquay-Varina PD Invest 3
FV_CA3
Fuquay-Varina PD Comm Aff 3
Talk Group ID #
35376
35392
35408
35424
35472
35488
35504
35520
35536
35584
Garner
Alpha Tag
G_PDDISP
G_PDOPS2
G_PDOPS3
G_PDOPS4
G_PDSRT1
G_PDSRT2
G_PDSRT3
G_PDIVES
G_PDADMN
G_PDTAC
Description
Garner PD Dispatch
Garner PD Ops 2
Garner PD Ops 3
Garner PD Ops 4
Garner PD SRT 1
Garner PD SRT 2
Garner PD SRT 3
Garner PD Invest
Garner PD Admin
Garner PD Tactical
Talk Group ID #
35680
LE
Alpha Tag
LEEAST_DISP
Description
LE East (Region)
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Talk Group ID #
35744
35760
35776
Wendell
Alpha Tag
W_PDOPS1
W_PDOPS2
W_PDADMN
Description
Wendell PD Ops 1
Wendell PD Ops2
Wendell PD Admin
Talk Group ID #
35824
35840
35856
Zebulon
Alpha Tag
Z_PDOPS1
Z_PDOPS2
Z_PDADMN
Description
Zebulon PD Ops 1
Zebulon PD Ops 2
Zebulon PD Admin
Talk Group ID #
35888
35904
35920
Knightdale
Alpha Tag
K_PDOPS1
K_PDOPS2
K_PDADMN
Description
Knightdale PD Ops1
Knightdale PD Ops2
Knightdale PD Admin
Talk Group ID #
35952
35968
35984
36000
36016
36032
36048
36080
WCPS
Wake Forest
Alpha Tag
Description
WF_PDDISP
Wake Forest PD Disp
WF_PDTAC1
Wake Forest PD TAC 1
WF_PDTAC2
Wake Forest PD TAC 2
WF_PDTAC3
Wake Forest PD TAC 3
WF_PDADMN
Wake Forest PD Admin
WF_PDCOM
Wake Forest PD Comm
WF_PDSWAT
Wake Forest PD Tact Swat
WF_PDD&V
Wake Forest Drug & Vice
Talk Group ID #
36096
36112
Rolesville
Alpha Tag
RV_PD1
RV_PD2
Description
Rolesville PD 1
Rolesville PD 2
Talk Group ID #
37760
37776
37792
37808
Holly Springs
Alpha Tag
HS_PDDISP
HS_FDDISP
HS_OPS1
HS_OPS2
Description
Holly Springs PD Disp
Holly Springs FD Disp
Holly Springs PD Ops 1
Holly Springs PD Ops 2
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Talk Group ID #
27248
Apex
Alpha Tag
AP FDEMS
Description
Apex DS & EMS Disp
Programming equipment
Uniden American Corporation BC296D and BC 296D
Programming Type 2/Digital 800 MHz Systems
To program a Type 2/Digital 800 MHz system, you need to know the frequencies that the system
uses. Please refer to the frequency list in this guideline.
1. Select the trunk-programming mode.
2:SCAN OPTION → 2:TRUNK
2. Use the scroll bar to select the bank you want to program, then press E.
1:TRUNK TYPE → 1:ON
3. Select one of the following trunk types for Motorola Type 2 or digital Systems:
1:TYPE2/P25 800
Motorola Type 2 or Digital systems in the 800 MHz band
4. Select the channel to store the information into.
2:TRUNK CHANNEL
Use the scroll bar to select a channel within the bank to store a system frequency, then press E.
5. Store the channel information
1:FREQUENCY
Enter the frequency for the channel, then enter an Alpha Tag for the channel.
Repeat Steps 4 and 5 to store the rest of the frequencies for the system.
Programming Talkgroups
For many of the trunk scanning features to operate, you need to program the scanner with the
talkgroup ID’s. Each bank can store up to 100 talkgroups in 10 ID groups of 10 talkgroups each.
Group similar talkgroups together in the same ID group. When scanning, you can turn ID groups
on and off with a quick keypress.
Storing Known Talkgroups
Follow these steps to store talkgroups that are listed in this guidline.
2:SCAN OPTION → 2:TRUNK → Select the bank→ 3:TALK GROUP
1. Use the scroll bar to select the talkgroup to program, then press E.
2. Select 1:ID and press E.
3. Enter the up to 5-digit talkgroup ID, then press E.
Note: If you replace an existing ID, the alpha tag is also deleted.
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4. Select
2:ALPHA TAG and press E.
5. Enter the alpha tag for the talkgroup.
Note: The alpha tag defaults to the numeric talkgroup ID.
6. If you want the scanner to beep three times to alert you when the talkgroup is active,
select
3:BEEP ALERT and press E; then, select 1:ON.
7. Press MENU/BACK.
Repeat this procedure for each talkgroup in the system.
Radio Shack Corporation PRO-96
Programming Motorola analog, digital, and APCO-25 trunking systems
1. Press PGM and FUNC then S or T to select the desired channel storage bank to
program.
2. Press TRUNK to access the ID list and set the correct trunking bank type. If the bank has
never been programmed with a trunking system, the scanner will display ‘Not trunked!’
Press mode.
3. Press MODE until MOT (Motorola) appears in the display. This sets the channel storage
bank for Motorola operation.
4. Press PGM to return to the channel storage bank.
5. Select a channel to begin programming trunking system frequencies. Used direct channel
entry or the S or T keys. Please refer to the frequency list in this guideline.
6. Enter the trunking frequency and press ENTER. If necessary, press MODE to change the
receiving mode to MOT.
7. Repeat Steps 5 and 6 to enter the other trunking system control channel frequencies for
the system you wish to monitor.
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Programming Talkgroups
Each channel storage bank has an associated talkgroup ID list, for a total of 10 talkgroup ID lists.
Each ID list has 5 sub-banks. Each sub-bank has 30 ID locations. You can program up to 150
talkgroup IDs in each bank, so you can program up to 1500 talkgroup IDs in 10 banks.
1.
2.
3.
4.
5.
Navigate to a channel in the desired trunking bank using MAN or the S or T keys
Press PGM.
Press TRUNK.
Select the ID memory you wish to edit using any of the methods described above.
Enter the up to 5-digit talkgroup ID and press ENTER.
6. If you want to tag the ID, press TEXT, enter the desired text tag for the ID. Then
press ENTER.
7. To store the next ID memory in sequence, press p and repeat Step 5.
8. Press SCAN to start scanning.
Use the following keystrokes to navigate through the ID lists:
· Press PGM TRUNK to enter the ID list for the current channel storage bank.
· Press and release the S or T keys to scroll through the ID memories one at a time.
· Press and hold the S or T keys to scroll through the ID memories rapidly.
· Press TRUNK to advance to the next ID sub-bank.
· Press FUNC S or T to advance to the next or previous ID list.
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Glossary of Terms
Alphanumeric Display - Allows you to enter a “Title/Name” for each Bank, Talk Group and
Channel. When the scanner stops on a Talk Group you will actually see the title of the talk group
you are monitoring.
Alpha Tag - This term refers to an alphanumeric text tag that you can enter to describe the
individual frequencies that you have programmed. Rather than having to associate a specific
frequency to the individuals that are using it, you can enter the actual name of the group. This will
eliminate the need for memorizing the group’s frequency.
APCO – Association of Public Safety Communications Officials.
APCO Project 25 – A user-driven effort to develop a digital standard for wireless
communications users. These standards enable critical communications for the safety and security
of communities across North America and the world. In emergency situations, Project 25 users
can communicate with other agencies and mutual aid response teams. Project 25 wireless mission
critical communications user needs include these key digital standard attributes:
Backward compatibility and graceful migration.
Scalable Trunked and Conventional capabilities
Spectral efficiency.
Interoperability
C4FM – Compatible 4 level FM - A modulation process used in Project 25 Phase I digital radio
deployment that reduces the channel bandwidth down to 12.5kHz.
Control Channel - This is the frequency within a trunking system that runs the system. On
Control Channels (sometimes called Data Channels) you will hear a buzz saw sound. For the
most part, it is the sound of the system’s central computer directing talkgroups to particular voice
(working) frequencies within the system.
CQPSK – Compatible Quadrature Phase Shift Keying - a modulation process used in Project 25
Phase II digital radio deployment that reduces the channel bandwidth down to 6.25kHz.
Scan List - When you designate a bank to be a trunking bank, your scanner sets up Scan Lists,
which are simply list of your favorite Talkgroup IDs. These lists are designed to help you
organize the trunking system users into categories.
Talkgroup - A group of users within a trunked system that communicates with one another.
Since a trunked system shares multiple frequencies, various numbers (trunking ID or talk group
ID) are assigned to each department within the system. The number assigned to the department
you wish to monitor must be entered into the scanner in order for you to monitor the agency.
Trunked Radio System - Conventional scanning is a simple concept. You enter a radio
frequency in your scanner's memory, which is used by someone you want to monitor. For
example, the police in your area may broadcast on 460.500 MHz, the fire department on 154.190
MHz, the highway department on 37.900 MHz, etc. So when your scanner stops on a frequency,
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you usually know who it is, and more importantly, you can stop on a channel and listen to an
entire conversation. This type of scanning is simple and easy to set up and find.
As the demand for public communications has increased, many public radio users don't have
enough frequencies. To use a limited amount of radio frequency efficiently, trunking radio
systems were developed.
In a trunked radio system, which contains up to 28 different frequencies, radio users are divided
into groups, often called talk groups, and these talk groups are assigned specific IDs. When
someone in a talk group uses their radio, a brief burst of data is broadcasted before each
transmission. The trunking system computer uses this data to temporarily assign each radio in a
talk group to an available frequency. If the group using a frequency stops broadcasting or pauses
between replies for a few seconds, they are removed from the frequency so another talk group can
use it.
Sharing of the available public service frequencies, or trunking, allows cities, counties, or other
agencies to accommodate hundreds of users with relatively few frequencies. Following a
conversation on a trunked system using a conventional scanner is difficult, if not impossible.
When there is a short break during the conversation you are monitoring, it is possible that the talk
group will be assigned to a completely different frequency in the trunked system. This type of
scanning is more complex. Trunk tracking technology solves this problem and allows you to
monitor the entire conversation; no matter how many times the system changes frequencies.
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Acknowledgements
Radioreference.com
P25.com
Ifrsys.com
Motorola.com
Uniden American Corporation
- BC796D APCO P-25 Digital Scanner User Manual
- BC296D APCO P-25 Digital Handheld Scanner User Manual
Radio Shack Corporation
- PRO-96 Digital Trunking Handheld Scanner User Manual
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