Codan MT-3 User manual

Technical Notes for
Tuning, Installing,
Maintaining and Servicing
MT-3 and MT-4 Radio Systems
TECHNICALNOTES
Codan Communications
43 Erie Street
Victoria, British Columbia
Canada V8V 1P8
International
Phone: [phone]
Fax: [phone]
Email: [email protected]
Web: www.codancomms.com
Toll Free Canada and U.S.A.
Phone: [phone]
Fax: [phone]

Table of Contents
MT-3/4 Radio Systems
TECHNICAL NOTES
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System Overview
TN105 Dual Subrack Interconnection
TN110 Channel and Frequency Selection
TN150 Repeater / Tone Remote Controlled Base Station
TN151 Base Station Interface Connections
TN152 Linked Repeater Networks
TN160 Base Station or Link Confi guration Settings
TN175 MT-4E Firmware Upgrading
TN180 P25 Digital Ping Feature
TN181 Adjustable Courtesy Tone
TN182 Battery Level Reporting and Remote P25 Test Tone
Receiver Modules
TN247 VR-4E VHF MT-4E Receiver
TN267 UR-4E UHF MT-4E Receiver
TN287 UR-4E UHF 700 / 800 / 900 MHz MT-4E Receiver
Transmitter Modules
TN347 VT-4E VHF MT-4E Transmitter
TN367 UT-4E UHF MT-4E Transmitter
TN387 UT-4E UHF 700 / 800 / 900 MHz MT-4E Transmitter
Power Amplifi ers
TN441 AMP-4 VHF and UHF 30 Watt Power Amplifi ers
TN490 19” Rack Mount High Power Amplifi ers
TN491 Modular 5-Pack Series High Power Amplifi ers

Table of Contents
MT-3/4 Radio Systems
TECHNICAL NOTES
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Subracks
TN500 SR-39-1 Subrack
TN520 SR-39-3 Multiple Receiver Subrack
Control Cards
TN600 AC-3E Audio Control Card
TN640 CI-PM-3 Paging Modulator
TN650 CI-RC-4L Repeater Control Card
TN652 CI-RC-4M-G2 Multiple Link Controller
TN655 CI-BC-4E Base Control Card
TN661 UIC-5 Universal Interface Card
TN670 Stratus Controller
Transportable Systems
TN710 ET-3 Transportable Radio System Case
TN720 ET-4 Transportable Radio System Case
TN730 ET-5 Transportable Tactical Radio System
TN735 ET-6 Transportable Tactical Radio System
TN750 ET-1 Transportable Radio System Case
TN760 Stratus Transportable Tactical Radio System
TN761 Stratus Fixed Infrastructure Radio System
TN765 Stratus Tactical Controller
TN790 Transportable Radio System Accessories
TN791 Stratus Power Center
TN792 Stratus Rapid Antenna

Table of Contents
MT-3/4 Radio Systems
TECHNICAL NOTES
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Other
TN800 A-PNL-AUX96-3 Auxiliary Connector
TN811 SM-3 System Regulator
TN830 AC to DC and DC to DC Power Supplies
TN835 High Current AC to DC Power Supplies
TN836 High Current Digital Series AC to DC Power Supplies
TN840 Extender Cards and Kits
TN855 CI-DSP-223 Telex (Vega) DSP Tone-Remote Adapter
TN856 CI-IP-223 Telex (Vega) IP Network Remote Adapter
TN857 CI-IP-ADAPTER-1 Telex (Vega) IP-224 Ethernet Adapter
TN870 CI-RSWITCH Redundant Switch

TN105 Dual Subrack Interconnection
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
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TECHNICAL NOTE: TN105, REV 6-0-0, © November 2018
[e-mail]
The SR-39-1 subrack is designed to hold and interconnect the MT-3 and MT-4 series of receiver, transmitter and
control modules on one universal motherboard. This motherboard distributes audio, control and power signals
between the separate modules plugged into the subrack. The two main power signals used by the MT-3 and MT-4
modules are the +13.8 Vdc (power input) and +9.5 Vdc (regulated) power.
The +13.8 Vdc power input (+13.8 Vdc nominal, +10 to +17 Vdc range) is connected to the motherboard by a
terminal strip mounted on the back of the subrack. The +13.8 Vdc signal line is routed through the System Regulator
(SM-3) module and then distributed across the motherboard to the other modules. This allows the user to un-plug
the SM-3 module and turn off all power supplied to the other modules. This feature is not used very often as all
Codan modules are capable of being hot swapped.
The +9.5 Vdc regulated power is generated in the System Regulator module by the internal +9.5 Vdc voltage
regulator built into the SM-3. This +9.5 Vdc regulated voltage is then distributed across the motherboard to the
other modules. The voltage regulator is designed to source enough current to operate all modules in the subrack.
If a Codan radio system is designed so that a second subrack is required, the confi guration is dependent on the
modules in the second subrack:
Receivers, Transmitters or Control Cards In Second Subrack
If the second subrack requires receiver, transmitter or control cards, a system regulator is required in the second
subrack to source enough current for the +9.5 Vdc regulated voltage to these modules.
AMP-4 30 Watt Power Amplifi ers
If the second subrack contains Codan AMP-4 series 30 Watt power amplifi er modules, the AMP-4 series amplifi ers
do NOT use +9.5 Vdc power, so ONLY the +13.8 Vdc connection is required on the second subrack.
AMP-2 30 Watt Power Amplifi ers
If the second subrack contains Codan AMP-2 series 30 Watt power amplifi er modules (see Figure 1), the +9.5 Vdc
power is required, however, the regulated voltage current draw for these modules is very low, and the SM-3 in the
fi rst subrack can source enough current for the power amplifi ers in the second subrack. In this case, a second SM-3
module is not required, and the +9.5 Vdc regulated voltage is jumpered from the fi rst subrack with the SM-3 to the
second subrack with no SM-3 module, using the +9.5 Vdc input / output connector on the motherboards.
Jumper JU1 required on all second subracks with no SM-3 (AMP-2 and AMP-4 series)
If the second subrack has no SM-3 module installed, jumper JU1 is required to be installed in the second subrack
to allow +13.8 Vdc power to be connected to the 30 Watt power amplifi ers (the +13.8 Vdc is typically routed through
the SM-3). Jumper JU1 is typically a 16 AWG wire soldered across the jumper points (see Figure 2 for jumper wires
and JU1 placement). On older motherboards (Serial # 123125 and earlier) the jumper is in the same location, but
is labelled as JU40.
If a radio system is ordered from the factory with these confi gurations, the jumper wires are included in the shipment
and jumper JU1 is installed at the factory.

TN105 Dual Subrack Interconnection
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 2 of 2
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Figure 1 - Front View of Dual Subracks; Second Subrack has only AMP-2 series Power Amplifiers
Figure 2 - Rear View of Dual Subracks; Jumper wires between first and second subrack
FIRST SUBRACK WITH
TRANSMITTERS, RECEIVERS,
SYSTEM MONITOR & CONTROL CARD
SECOND SUBRACK WITH
AMP-2 SERIES 30 WATT
POWER AMPLIFIER MODULES
NO SYSTEM MONITOR
REQUIRED
NO CONTROL CARD
REQUIRED
REPEATER
CONTROL
RX B
TX B
RX A
TX A
CI-RC-4L
PULL DOWN
TO REMOVE
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
DANIELS
ELECTRONICS LTD.
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
DANIELS
ELECTRONICS LTD.
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
DANIELS
ELECTRONICS LTD.
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
DANIELS
ELECTRONICS LTD.
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
POWER AMPLIFIER
PWR
TX
O / T
VSWR
ON
OFF
RF OUT
RF IN
DANIELS
ELECTRONICS LTD.
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
POWER AMPLIFIER
PWR
TX
O / T
VSWR
ON
OFF
RF OUT
RF IN
DANIELS
ELECTRONICS LTD.
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
+9.5 Vdc
REGULATED
POWER OUTPUT
POWER INPUT
+10 to +17 Vdc
+13.8 Vdc NOMINAL +9.5 Vdc
POWER INPUT
SECOND SUBRACK WITH
30 WATT POWER AMPLIFIER
MODULES ONLY
JU1 INSTALLED
WITH 16 AWG WIRE
(REQUIRED WHEN NO
SM-3 IS INSTALLED)
POWER INPUT
+10 to +17 Vdc
+13.8 Vdc NOMINAL
FIRST SUBRACK WITH
TRANSMITTERS, RECEIVERS,
SYSTEM REGULATOR & CONTROL CARD
POWER
SUPPLY
INPUT
+9.5 Vdc INTERCONNECT CABLE
REQUIRED FOR AMP-2 CONFIGURATIONS
(NOT AMP-4)

TN110 Channel and Frequency Selection
MT-3/4 Radio Systems
TECHNICAL NOTES
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MT-4E Channel and Bank Selection
MT-4E radio modules are capable of 16 channel operation in 2 banks (32 channels total).
The 16 channels are controlled via four CSEL signal lines connected to each receiver and transmitter module. The
CSEL signal lines are set as either a 0 (0 Vdc) or a 1 (+9.5 Vdc). Table 1 shows the channel selected for the CSEL
input settings.
Table 1: Channel Selection Settings
Channel Decimal CSEL3 CSEL2 CSEL1 CSEL0
100000
210001
320010
430011
540100
650101
760110
870111
981000
1091001
11101010
12111011
13121100
14131101
15141110
16151111
The Receiver and Transmitter Bank A/B select lines are set as either a B (0 Vdc) or an A (+9.5 Vdc). The logic for
the Bank A/B select lines is diff erent from the CSEL signal lines. If the Bank A/B select line is pulled high (+9.5 Vdc),
or left fl oating, Bank A is selected. If the Bank A/B select line is pulled low (0 Vdc), Bank B is selected.
On older motherboards (Serial # 123125 and earlier), the Receiver Bank A/B select line uses the same line as the
MT-3 Receiver ISO COR K and the Transmitter Bank A/B select line uses the same line as the MT-3 Transmitter
Standby. No jumpers are available for the Bank select.

TN110 Channel and Frequency Selection
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 2 of 4
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There are 3 diff erent ways to change the channel and bank of a transmitter / receiver module:
1 The user can set jumpers mounted on the motherboard for each Channel Select signal line (set of four for
each Tx / Rx module) and Bank A/B select line. These jumpers can be used to permanently set a subrack
slot at a specifi c channel and bank.
• Jumpers can be set for 0 (0 Vdc) “down” or 1 (+9.5 Vdc) “up”.
• Pull-up resistor jumpers to +9.5 Vdc must be installed.
2 CSEL signal lines and Bank A/B select lines can be controlled externally by a tone remote adapter, a
CI-RC-4M-G2 multiple link controller, or other third party devices.
3 Sixteen-position rotary select switches mounted on the CI-BC-4E base controller can control the CSEL lines
and toggle switches can control the Bank A/B select line. Optionally the CI-RC-4L repeater controller or AC-3E
control card can have a rotary switch added for control of the CSEL signal lines. The control lines can also be
controlled by selecting the channel through a UIC control card.
The Pull-up resistor jumpers to +9.5 Vdc must be removed and all channel select and bank select jumpers must be
installed in the 1 or “up” position for both external control and rotary switch control of channel selection.
MT-4 Modules Frequency Selection
The MT-4 modules operating frequency is selected in standard channel increments through the Radio Service
Software (RSS). Frequencies can be directly entered or selected through the use of a spin button that cycles
through valid frequencies.
Transmitter A Channel Select Switching Control Option
The motherboard can be jumper confi gured to allow switching control of the TXA CSEL lines between a control card
and an external connection such as a tone remote.
Jumpers JU86 to JU93 are installed by default to allow either the A-PNL-AUX96-3 auxiliary connector, or AC-3E /
CI-BC-4E / UIC-4 control cards to have control of the Transmitter A channel select lines. This will cause contention
if both a control card and auxiliary connection attempt to change the channel select lines.
Switching control of the Channel Select lines can be selected by use of two General Purpose Inputs. GPIO22 and
GPIO23 allow for the use of a connection to Ground to enable or disable local control.
GPIO22 - Ground disables local (AC-3E / CI-BC-4E / UIC-4) control & enables auxiliary control.
GPIO23 - Ground enables local (AC-3E / CI-BC-4E / UIC-4) control & disables auxiliary control.
To allow switching control of the channel select lines remotely, remove jumpers JU86 to JU93, and install jumpers
JU94 to JU101, then install jumper JU102 or JU103 to determine if an active low will enable or disable the local
control of the channel select control.

TN110 Channel and Frequency Selection
MT-3/4 Radio Systems
TECHNICAL NOTES
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Transmitter A Channel Select Switching Control Option Diagram
TXA CSEL0
TXA CSEL2
TXA CSEL1
B21
A-PNL-AUX96-3
AUXILIARY
CONNECTOR
(P1)
C23
A21
C21
JU94
JU95
JU96
JU97
B21
AC-3E
CI-BC-4E
UIC-4
CONNECTOR
(J1)
C23
A21
C21
JU98
JU99
JU100
JU101
JU92 JU90 JU86 JU88
JU93 JU91 JU87 JU89
TXA CSEL3
GPIO23
(GND ENABLES
LOCAL CONTROL)
JU102
PWR
GPIO22
(GND DISABLES
LOCAL CONTROL)
JU103
REVERSE
LOGIC

TN110 Channel and Frequency Selection
MT-3/4 Radio Systems
TECHNICAL NOTES
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This Page Intentionally Left Blank

TN150 Repeater / Tone Remote Controlled Base Station
MT-4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
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A Codan radio system can be confi gured for a wide variety of radio system solutions. The large number of varied
solutions and the customizability of the radio system makes for a wide variety of audio, serial data and COR-PTT
routing confi gurations.
A repeater / analog controlled base station uses the LVDS serial data cable to allow full mixed mode (analog and
P25 digital) repeating, while the analog audio is sent to and from the tone remote adapter via the AC-3E or CI-BC-
4E control cards. This system can be confi gured as a “repeater only” by removing the control card or tone remote
adapter. It can also be confi gured as a “tone remote controlled base only” by removing the LVDS serial data cable.
If used as an analog repeater only, jumpers can be set in the control card to repeat audio and the LVDS serial data
cable can be disconnected.
Connections to the tone remote adapter are typically made from the receiver and transmitter, through the control
card to the adapter. Physical connections can be made on the A-PNL-AUX96-3 auxilairy connector, or the DB-25
connector (J10), both located on the back of the subrack.
Optionally, the receiver and transmitter can be connected directly to the tone remote adapter and bypass the control
card. The control card should be removed from the subrack or unwanted loading could occur. The A-PNL-AUX96-3
auxiliary connector supports connection directly to the receiver and transmitter, and the DB-25 (J10) can be jumper
selected to change the pins from Auxiliary Audio to Receiver / Transmitter Audio.
The tone remote adapter may also be replaced by an IP adapter, such as a Telex IP-223 or IP-224
DB25 Connector (J10)
Connector J10 is a female DB25 connector which can be used for basic base connections. When connected to a
Telex DSP-223 or IP-223 / IP-224, a standard straight-through male-to-male DB25 cable can be used with some
motherboard jumper changes. The IP-224 requires a female DB25 to male DB37 adapter. The IP-223 / IP-224
also requires that 2 pins on the DB25 (PTT COM - pin2 and MON COM - pin 16) are wired to ground for proper
operation. The DB25 can also be jumpered for Balanced Audio direct to / from the receiver / transmitter or Auxiliary
Audio (recommended) through the controller.
WARNING: JU108 must be confi gured correctly for DSP-223 or IP-223 / IP-224 or damage can occur.
JU104 A= RXABal O/P2 or B =AUX 1 AUD O/P2 JU107 A= RXABal O/P1 or B =AUX AUD O/P1
JU105 A= TXABal I/P2 or B =AUX 1AUD I/P2 JU108 A= DSP-223 / +13.8 V or B = IP-223 & IP-224/ RXACOR
JU106 A= TXABal I/P1 or B =AUX 1AUD I/P1 JU109 TXASEC / CLR I/P (installed to enable TXASEC / CLR I/P)

TN150 Repeater / Tone Remote Controlled Base Station
MT-4 Radio Systems
TECHNICAL NOTES
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AUXILIARY
BALANCED
AUDIO INPUT
2 or 4 WIRE
LINE
INPUT / OUTPUT
OPTICAL
ISOLATOR
TRANSMITTER
1 KHz Tone @ 60% of Max. Modulation (1.5 KHz Narrowband 3.0 KHz Wideband)
RECEIVER
RX BALANCED
AUDIO OUTPUT
-8.0 dBm
(307 mVrms) 1 KHz Tone @
60% of Max. Modulation (1.5 KHz Narrowband 3.0 KHz Wideband)
AUXILIARY
BALANCED
OUTPUT
-8.0 dBm
(307 mVrms)
AC-3E or CI-BC-4E
TX BALANCED
AUDIO INPUT
LINE
RX
RADIO
TX
LINE
TX
RADIO
RX
0 dBm
(775 mVrms)
0 dBm
(775 mVrms)
TX PTT INPUT
AUXILIARY
PTT (K) INPUT
PTT PTT
RJ45 Cable LVDS Serial Data + Analog and Digital COR-PTT Routing (Required for P25 Digital Repeater)
COR->PTT
Jumper
(Must NOT
be used
with RJ45
Cable
Installed)
Jumper Installed
to Disable
Audio Path
(Must be used
with RJ45 Cable
Installed)
TELEX (VEGA) DSP-223
TONE REMOTE ADAPTER
TO / FROM
TONE REMOTE
CONSOLE
RX COR OUTPUT
COR
ALL AUXILIARY CONNECTIONS
AVAILABLE ON A-PNL-AUX96-3
and DB-25 CONNECTOR
ALL INTERNAL CONNECTIONS
AVAILABLE ON A-PNL-AUX96-3
(TYPICALLY USED FOR TEST PURPOSES)
OPTIONALLY AVAILABLE ON DB-25
CONNECTOR (VIA JUMPER SELECT)
ANALOG LVDS
LEVEL ADJUST
ANALOG LVDS
LEVEL ADJUST

TN151 Base Station Interface Connections
MT-4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
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Base Stations can be interfaced to a console, or console network through a variety of technologies that have
changed considerably over the years.
Analog Tone Remote Interface
An Analog Tone Remote Interface provides a means of remotely controlling base stations by any voice grade
transmission medium such as a microwave link, a leased telephone line, or a twisted-pair 600-ohm line. An
industry-standard sequential tone keying format is generated by the console and is sent over the transmission
medium to a tone remote adapter that is capable of decoding the PTT tone sequence and the voice-plus-tone
signals. The tone portion of the voice-plus-tone signal is removed from the transmitted voice by the adapter. A tone
remote base station interface is shown in Figure 1.
Figure 1: Analog Tone Remote Interface
IP Network Remote Interface
An IP Network Remote Interface provides a means of remotely controlling base stations by any available Wide
Area Network (WAN) or Local Area Network (LAN) IP connection. This creates a Radio over IP (RoIP) network to
allow any Telex IP based console to communicate with the Telex IP Network adapter. Audio and control information
is encoded and decoded in a proprietary format over the network and converted back to analog audio and control
information (PTT) at the interface between the base station and adapter. The Telex IP network solution provides
voice and control over IP, but it is not end-to-end digital, or open standard. An IP network remote base station
interface is shown in Figure 2.
Figure 2: IP Network Remote Interface
In an analog tone remote and IP network remote, all P25 Digital communications are vocoded and de-vocoded at
the base station. This means that the interface does not support end-to-end encryption, P25 Digital ID’s or packet
data, to or from the console and base station.
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADEIN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNAA
RXA
TXA
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY(MHz)
MADEIN CANADA
MODEL# CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY(MHz)
MADEIN CANADA
MODEL# CODE
P25 BASE
CONTROL
BNK
PULLDOWN
TOREMOVE
5
9
13
RXA
A
B
BNK
5
9
13
TXA
A
B
TXA TXB
Secure
Clear
Zeroize
Key
Local
Disable
Enable
TELEX
PROGRAMMINGPORT
DSP-223
PTTIC
HANDSET
POWER PTT MONITOR
FUNCTION
CTCSS LINERX
LINETX+
RADIOTX +
RADIORX
LINETX
LINERX
RADIOTX
RADIORX
CTCSS
RADIOTX-
GROUND
LINETX-
A
NALOG TONE REMOTE
CONSOLE
ANALOG 2 OR 4 WIRE AUDIO AND TONES
(LEASED TELEPHONE LINES) ANALOG AUDIO INTERFACE
TELEX DSP-223 TONE
REMOTE ADAPTER
CODAN RADIO SYSTEM WITH AUDIO CARD
OR BASE CONTROL CARD
P25 DIGITAL OR
ANALOG SUBSCRIBER
COMMON AIR
INTERFACE
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADEIN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNAA
RXA
TXA
TRANSMITTER
CNTL
BUS
MIC RFOUT
AD
ANALOG
DIGITAL
NORM
OFF
KEYTX
MICMODE
REF
IN
USB
FREQUENCY(MHz)
MADEIN CANADA
MODEL# CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY(MHz)
MADEIN CANADA
MODEL# CODE
P25 BASE
CONTROL
BNK
PULLDOWN
TOREMOVE
5
9
13
RXA
A
B
BNK
5
9
13
TXA
A
B
TXA TXB
Secure
Clear
Zeroize
Key
Local
Disable
Enable
IP-223
TX
LNK
LINE
HANDSET
RX
GND
TX+
IC
TX-
TX
RX
TX
TX+
TX-
RADIO 1 RADIO 2
TELEX
TELEX IP BASED
CONSOLE
ANALOG AUDIO INTERFACE
TELEX IP-223 OR IP-224
IP REMOTE ADAPTER
TELEX PROPRIETARY DIGITAL IP INTERFACE
CODAN RADIO SYSTEM WITH AUDIO CARD
OR BASE CONTROL CARD
P25 DIGITAL OR
ANALOG SUBSCRIBER
COMMON AIR
INTERFACE
LAN / WAN

TN151 Base Station Interface Connections
MT-4 Radio Systems
TECHNICAL NOTES
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Proprietary IP Network Interface
A Proprietary IP Network Interface provides a means of remotely controlling one manufacturer’s base stations
by any available WAN or LAN IP connection. This creates a single vendor end-to-end digital RoIP network that
restricts interoperability, system fl exibility and competition. A proprietary IP network remote base station interface
is shown in Figure 3.
Figure 3: Proprietary IP Network Interface
P25 Open Standard Digital Fixed Station Interface (DFSI)
A P25 Open Standard Digital Fixed Station Interface (DFSI) provides a means of remotely controlling base stations
by any available WAN or LAN IP connection. This creates a multi-vendor platform end-to-end digital RoIP network
that supports full interoperability, system fl exibility and competitive pricing between vendors. A DFSI interface fully
supports end-to-end encryption, P25 Digital ID’s and packet data, to or from the console and base station. A DFSI
network remote base station interface is shown in Figure 4.
Figure 4: P25 Open Standard Digital Fixed Station Interface (DFSI)
P25 DFSI advantages over IP-223 / IP-224 Devices
• DFSI is an open standard multi-vendor protocol platform. IP-223/224 is a proprietary protocol.
• DFSI supports a direct digital interface to the Codan Base Station via IP. The IP-223/224 is an IPconnection to an analog gateway (IP-223/224) that
connects to the Codan Base Station via analog audio.
• DFSI supports full encrypted P25 voice to the console. An IP-223/224 will not transport encryption over the network.
• DFSI supports Single Block Commands as defined in the TIA-102 standards such as Radio Inhibit, CallAlert, Radio Monitor, Radio Check, etc. IP-
223/224 does not.
• IP-223 /224 requires a radio technician to tune analog audio levels in both the Codan Base Station and IP-223/224. DFSI is a direct digital interconnect
with no line level adjustments.
• DFSI supports the ability to upgrade to P25 Packet Data support such as GPS, Key Management, and othercapabilities. IP-223/224 does not.
MOTOROLA CENTRACOM
GOLD ELITE CONSOLE
MOTOROLA PROPRIETARY DIGITAL IP INTERFACE MOTOROLA QUANTAR
P25 DIGITAL OR
ANALOG SUBSCRIBER
COMMON AIR
INTERFACE
LAN / WAN
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
SYSTEM REGULATOR
MADEIN CANADA
VOL METER
+
-
ON
OFF
SPKR
INT
EXT
EXT
SPKR
ANTENNAA
RXA
TXA
P25 DFSI CONSOLE CODAN RADIO SYSTEM WITH UIC
LAN / WAN
TRANSMITTER
CNTL
BUS
MIC RFOUT
AD
ANALOG
DIGITAL
NORM
OFF
KEYTX
MICMODE
REF
IN
USB
FREQUENCY(MHz)
MADEIN CANADA
MODEL# CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY(MHz)
MADEIN CANADA
MODEL# CODE
P25 DIGITAL FIXED STATION INTERFACE P25 DIGITAL OR
ANALOG SUBSCRIBER
COMMON AIR
INTERFACE
UIC
RXB
TXB
RXA
TXA
PULLDOWN
TOREMOVE
ETHERNET
ZEROIZE
KEY

TN152 Linked Repeater Networks
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 1 of 4
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A linked repeater network is a series of repeaters that are linked together through RF links to create a wide area
conventional repeater network that allows for a widely confi gurable system with an expandable area of coverage
for mobile and portable radios (subscribers).
A linked repeater network can be installed as a fi xed network infrastructure, and can also be fully transportable. A
transportable linked repeater network is self-healing (linked repeaters can be added or removed at any time) and
is easily deployable and fi eld agile.
A linked repeater network is available as an analog only or analog and P25 digital (mixed mode) repeater network
giving the users full forwards and backwards compatibility with existing legacy equipment. In P25 Digital mode,
all encrypted voice and data will pass transparently through the repeater network. The repeaters do not require or
contain any encryption in order to pass the encryption through the repeater and links.
Repeaters and links can be any frequency band (VHF, UHF, 700/800/900 MHz). One common example is to have
VHF repeaters with UHF links.
Figure 1: Linked Repeater Network Diagram
A linked repeater network can be confi gured as two or more separate repeaters connected together. Figure 1
shows a system of three linked repeaters in use. Each repeater provides radio coverage for a local geographic
region utilizing a diff erent transmit / receive frequency pair. The repeater sites are RF linked together such that
transmitted information from Subscriber 1 is received at Site1, then linked to and rebroadcast from each repeater
in the system, allowing Subscriber 2 to receive the information from Site 3. This allows each subscriber to transmit
information to any other subscriber anywhere on the network.
The term Drop-Link is sometimes used to describe the repeater (drop) and the link in a linked repeater network.
HiveNet is also a term sometimes used to describe a linked repeater network.

TN152 Linked Repeater Networks
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 2 of 4
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Technical Description
Linked repeaters are made up of two transceivers, the repeater (sometimes referred to as the “Drop”), and the
Link. The Drop repeaters are on separate frequencies, while the link frequencies are matched (and reversed).
Figure 2 shows two repeaters linked together with frequency pairs. The Link is referred to as a “Switched Link”,
meaning that the receiver and transmitter are never active at the same time.
A Switched Link is typically half-duplex, allowing use of a duplexer or antenna relay for the antenna connection.
• An antenna relay allows for a more frequency agile link, transceiver frequencies can be changed without the
need for any duplexer retuning.
• A duplexer allows the Switched Link to be changed to a Repeating Link if the system needs to be expanded for
more linked repeaters.
• Simplex (same) frequencies can also be used on a two site Switched Link repeater with an antenna relay, but
every linked repeater must Link directly to each other (no “Chains” of links).
The use of diff erent repeaters all transmitting at the same time on diff erent frequencies is called multicasting.
Figure 2: Network of Two Repeaters
Site 1 Site 2
Drop Switched link
Tx-F1
Rx-F2
Tx-F3
Rx-F4
Drop
Switched link
Tx-F4
Rx-F3
Tx-F5
Rx-F6
To / From
Subscribers
To / From
Subscribers

TN152 Linked Repeater Networks
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 3 of 4
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Linked repeaters can be linked together to form diff erent confi gurations depending on requirements. For larger
systems a repeating link may be required as a centralized “hub” for the network as shown in Figure 3. Repeating
Links are full duplex and require a duplexer for the antenna connection, and possibly multiple antennas with a
power splitter or a multi-directional antenna.
Figure 3: Network of Four Repeaters
Drop Switched link
Tx-F1
Rx-F2
Tx-F3
Rx-F4
DropSwitched link
Tx-F3
Rx-F4
Tx-F5
Rx-F6
Repeating
link
Drop
Tx-F4
Rx-F3
Tx-F7
Rx-F8
Drop Switched link
Tx-F9
Rx-F10
Tx-F3
Rx-F4
Site 1 Site 2
Site 4
Site 3
To / From
Subscribers
To / From
Subscribers
To / From
Subscribers To / From
Subscribers

TN152 Linked Repeater Networks
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 4 of 4
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Some linked repeater confi gurations may also require multiple switched links in order to form a “chain” of repeater
links as shown in Figure 4. This requires another set of frequencies and another transceiver pair, but can allow
more customizing of the confi guration.
Figure 4: Repeater Network with Multiple Links
Site 2 Site 3
Drop
Switched link
Tx-F3
Rx-F4
Tx-F10
Rx-F9
Drop
Switched link
Tx-F9
Rx-F10
Tx-F5
Rx-F6
To / From
Subscribers
To / From
Subscribers
Switched link
Tx-F7
Rx-F8
Switched link
Tx-F8
Rx-F7
Drop
Tx-F1
Rx-F2
Site 1
To / From
Subscribers

TN160 Base Station or Link Confi guration Settings
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 1 of 2
[e-mail]
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When confi guring a Codan radio system for base station operation or for a linked confi guration, certain settings,
such as jumpers, may need to be installed to allow the base station or link to operate properly.
The receiver and transmitter modules are used with specifi c control cards to facilitate the external connections of a
base station, or to allow the complex connectivity of a linked system. The MT-3 modules are connected to an AC-3E
Audio Control Card and the MT-4 modules are connected to a CI-BC-4E Base Controller for base station operation,
or a CI-RC-4L Repeater Controller or CI-RC-4M-G2 Multiple Link Controller for a linked system. The A-PNL-
AUX96-3 auxiliary connector is recommended for facilitating all external connections in a base confi guration.
Antenna Relay Activation
The System Regulator module may have up to two optional antenna relays installed that can be used for a base
station or simplex / half-duplex link confi guration. The antenna relays are labeled as Relay A and Relay B (if only
one relay is installed, it is Relay A). The motherboard on the subrack contains a set of jumpers that are used to
activate the optional antenna relays in the System Regulator module. The relays are typically set with the PTT IN
and PTT OUT signal lines activating the relays.
Jumpers function as follows:
JU36 Tx A PTT OUT activates Relay A JU37 Tx A PTT IN activates Relay A
JU39 Tx A PTT OUT activates Relay B JU40 Tx A PTT IN activates Relay B
JU42 Tx B PTT OUT activates Relay A JU43 Tx B PTT IN activates Relay A
JU45 Tx B PTT OUT activates Relay B JU46 Tx B PTT IN activates Relay B
On older motherboards (Serial # 123125 and earlier) the jumpers were as follows:
JU16 Tx A PTT OUT activates Relay A JU12 Tx A PTT IN activates Relay A
JU14 Tx A PTT OUT activates Relay B JU10 Tx A PTT IN activates Relay B
JU15 Tx B PTT OUT activates Relay A JU11 Tx B PTT IN activates Relay A
JU13 Tx B PTT OUT activates Relay B JU9 Tx B PTT IN activates Relay B
Simplex Operation
The motherboard on the subrack contains a set of jumpers that are enabled when the radio system is operated in
simplex mode (simplex base station or simplex links). The jumper connects the Transmitter PTT OUT signal line to
the RX MUTE. This jumper will cause the receiver to mute when the transmitter is keyed.
JU38 Tx A PTT OUT mutes Rx A JU41 Tx A PTT OUT mutes Rx B
JU44 Tx B PTT OUT mutes Rx A JU47 Tx B PTT OUT mutes Rx B
The new System Regulators also have the same simplex mode jumpers for backwards compatibility with older
motherboards that did not have these jumpers. The jumpers were located on the old System Monitor as follows:
JU12 Tx A PTT OUT mutes Rx A JU13 Tx B PTT OUT mutes Rx B

TN160 Base Station or Link Confi guration Settings
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 2 of 2
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Control Card Simplex Operation
When a control card with LVDS Serial Data interconnect is used for the radio confi guration, the simplex muting
jumpers in the control card should be used in place of the jumpers on the motherboard. The jumpers on the control
cards activate faster than the jumpers on the motherboard
The CI-RC-4M-G2 Multiple Link Controller can be set for simplex link operation in the software under the System
Settings tab, but requires the MUTE line to be connected from the subrack to the controller.
The CI-RC-4L Repeater Control Card can be set for simplex link operation via the jumpers in the control card.
Simplex Operation Improvement
On some simplex base or link systems, the Rx MUTE line may be released too quickly after the Tx PTT is deactivated.
The RF signal has not had enough time to decay before the receiver is un-muted and this can produce an audible
noise burst or blip at the end of each transmission.
MT-3 Systems require that two resistors within the receivers be replaced with 47K ohm resistors (1150-4B1002FP).
R95 and R96 require replacement in FM receivers. AM receivers require that R35 and R83 are replaced.
MT-4E Systems have a software selectable Simplex Unmute Delay jumper setting that can be enabled in the RSS
software Service section.
MT-4D Systems require that JU33 is installed in the Y position in the receivers.
MT-4R Systems require a 4.7 uF capacitor (1055-5B475K16) to be added to the PTT OUT signal line. This
modifi cation was part of ECO 758. Any transmitters that were sold before, and have not been returned to the factory
since March 2003, will require this modifi cation for simplex operation.
MT-4R or MT-4D Base Station with Telex (Vega) DSP-223 Control
If an MT-4R or MT-4D base station is operated by a console other than a Telex product, through a Telex DSP-223
tone remote adapter, there is a possibility the transmitter may not change channels properly (only changing channels
every second time the PTT is activated at the console).
If the MT-4R or MT-4D system is being controlled by a CI-BC-4E Base Controller, JU125 is required to be installed
in the controller.
If the MT-4R or MT-4D system is being controlled by an AC-3E Audio Control Card (not recommended), a 22 uF
capacitor (1054-6G226M20) is required to be added by soldering the positive lead to J23 and the negative lead to
ground.