Codan MT-3, MT-4 Technical Notes For Tuning, Installing, Maintaining And Servicing

TECHNICAL NOTES

Technical Notes for

Tuning, Installing,

Maintaining and Servicing

MT-3 and MT-4 Radio Systems

Codan Communications
43 Erie Street
Victoria, British Columbia

Canada V8V 1P8

International
Phone: [phone]
Fax: [phone]

Email: [e-mail]
Web: www.codancomms.com

Toll Free Canada and U.S.A.
Phone: [phone]
Fax: [phone]

Table of Contents

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

TECHNICAL NOTES

MT-3/4 Radio Systems

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

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Table of Contents

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

TECHNICAL NOTES

MT-3/4 Radio Systems

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

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MT-3/4 Radio Systems

Table of Contents

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

TECHNICAL NOTES

TN870 CI-RSWITCH Redundant Switch

TABLE OF CONTENTS

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN105 Dual Subrack Interconnection

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.

TECHNICAL NOTE: TN105, REV 6-0-0, © November 2018
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TN105 Dual Subrack Interconnection

FIRST SUBRACK WITH

TRANSMITTERS, RECEIVERS,

SYSTEM MONITOR & CONTROL CARD

CI-RC-4L

REPEATER
CONTROL

PULL DOWN
TO REMOVE

TRANSMITTER

FREQUENCY (MHz)

AD

REF

IN

NORM
OFF
KEYTX
ANALOG

MICMODE

CNTL
BUS

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

DANIELS

ELECTRONICS LTD.

DIGITAL

TXA

RXA

TX B

RX B

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

RF NI

CNTL
BUS

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

MICMODE

CNTL
BUS

REF

IN

USB

TRANSMITTER

FREQUENCY (MHz)

AD

MIC RF OUT

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

NORM
OFF
KEYTX
ANALOG
DIGITAL

TECHNICAL NOTES

MT-3/4 Radio Systems

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

CNTL
BUS

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

SYSTEM REGULATOR

FUNCTION

1

12

2

11

3

10

4

9

5

8

67

POWER

+

METER

-

MADE IN CANADA

ON

OFF

VOL

ON
OFF

RF NI

SPKR

INT
EXT

EXT

SPKR

NO CONTROL CARD

REQUIRED

RF OUT

RF IN

POWERAMPLIFIER

PWR

TX

O / T

VSWR

FREQUENCY (MHz)

ON

OFF

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

SECOND SUBRACK WITH

AMP-2 SERIES 30 WATT

POWER AMPLIFIER MODULES

RF OUT

RF IN

POWERAMPLIFIER

PWR

TX

O / T

VSWR

FREQUENCY (MHz)

ON

OFF

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

NO SYSTEM MONITOR

REQUIRED

Figure 1 - Front View of Dual Subracks; Second Subrack has only AMP-2 series Power Amplifi ers

+9.5 Vdc

REGULATED

POWER OUTPUT

FIRST SUBRACK WITH

TRANSMITTERS, RECEIVERS,

SYSTEM REGULATOR & CONTROL CARD

+9.5 Vdc INTERCONNECT CABLE
REQUIRED FOR AMP-2 CONFIGURATIONS
(NOT AMP-4)

+9.5 Vdc

POWER INPUT

SECOND SUBRACK WITH

30 WATT POWER AMPLIFIER

MODULES ONLY

POWER
SUPPLY

INPUT

POWER INPUT
+10 to +17 Vdc

+13.8 Vdc NOMINAL

POWER INPUT
+10 to +17 Vdc

+13.8 Vdc NOMINAL

JU1 INSTALLED

WITH 16 AWG WIRE

(REQUIRED WHEN NO

SM-3 IS INSTALLED)

Figure 2 - Rear View of Dual Subracks; Jumper wires between fi rst and second subrack

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN110 Channel and Frequency Selection

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.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN110 Channel and Frequency Selection

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.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN110 Channel and Frequency Selection

Transmitter A Channel Select Switching Control Option Diagram

(J1)

UIC-4

AC-3E

CI-BC-4E

CONNECTOR

TXA CSEL3

TXA CSEL2

TXA CSEL1
TXA CSEL0

JU87

JU86

JU89

JU88

JU91

JU90

JU93

JU92

JU98

JU94

C23

JU99

JU95

A21

JU100

JU96

B21

JU101

JU97

C21

LOGIC

REVERSE

C23

TN110, REV 4-0-0, © Aug 2016

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A21

B21

(P1)

AUXILIARY

CONNECTOR

A-PNL-AUX96-3

C21

PWR

JU102

JU103

GPIO23

GPIO22

(GND ENABLES

(GND DISABLES

LOCAL CONTROL)

LOCAL CONTROL)

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TN110 Channel and Frequency Selection

This Page Intentionally Left Blank

TECHNICAL NOTES

MT-3/4 Radio Systems

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TECHNICAL NOTES

MT-4 Radio Systems

TN150 Repeater / Tone Remote Controlled Base Station

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-BC­4E 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 = RX A Bal O/P2 or B = AUX 1 AUD O/P2 JU107 A = RX A Bal O/P1 or B = AUX AUD O/P1
JU105 A = TX A Bal I/P2 or B = AUX 1 AUD I/P2 JU108 A = DSP-223 / +13.8 V or B = IP-223 & IP-224/ RX A COR
JU106 A = TX A Bal I/P1 or B = AUX 1 AUD I/P1 JU109 TX A SEC / CLR I/P (installed to enable TX A SEC / CLR I/P)

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TECHNICAL NOTES

MT-4 Radio Systems

TN150 Repeater / Tone Remote Controlled Base Station

RJ45 Cable

LVDS Serial Data +

Analog and Digital

COR-PTT Routing

(Required for P25

Digital Repeater)

1 KHz Tone @

60% of Max. Modulation

(1.5 KHz Narrowband

3.0 KHz Wideband)

1 KHz Tone @

60% of Max. Modulation

(1.5 KHz Narrowband

3.0 KHz Wideband)

ANALOG LVDS

TRANSMITTER

TX PTT INPUT

OPTICAL

AC-3E or CI-BC-4E

ISOLATOR

AUXILIARY

PTT (K) INPUT

PTT PTT

LEVEL ADJUST

AUDIO INPUT

TX BALANCED

AUXILIARY

BALANCED

AUDIO INPUT

-8.0 dBm
(307 mVrms)

0 dBm

(775 mVrms)

RECEIVER

Jumper

be used

with RJ45

(Must NOT

COR->PTT

to Disable

Audio Path

(Must be used

with RJ45 Cable

Jumper Installed

ANALOG LVDS

LEVEL ADJUST

COR

RX COR OUTPUT

Cable

Installed)

Installed)

AUXILIARY

RX BALANCED

BALANCED

-8.0 dBm

AUDIO OUTPUT

0 dBm

OUTPUT

(307 mVrms)

(775 mVrms)

ALL INTERNAL CONNECTIONS

AVAILABLE ON A-PNL-AUX96-3

OPTIONALLY AVAILABLE ON DB-25

CONNECTOR (VIA JUMPER SELECT)

(TYPICALLY USED FOR TEST PURPOSES)

and DB-25 CONNECTOR

AVAILABLE ON A-PNL-AUX96-3

ALL AUXILIARY CONNECTIONS

TX

RADIO

RX

LINE

TELEX (VEGA) DSP-223

TONE REMOTE ADAPTER

CONSOLE

TO / FROM

TONE REMOTE

TN150, REV 1-0-0, © Aug 2016

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LINE

2 or 4 WIRE

INPUT / OUTPUT

RX

RADIO

TX

LINE

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A

MT-4 Radio Systems

TN151 Base Station Interface Connections

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.

TELEX DSP-223 TONE

DSP-223

FUNCTION

HANDSET

PROGRAMMING PORT

POWER PTT MONITOR

RECEIVER

FREQUENCY (MHz)

AD

USB

CNTL
BUS

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

REMOTE ADAPTER

OR BASE CONTROL CARD

SPKR

FUNCTION

12

11

10

9

8

VOL METER

ON
OFF

INT
EXT

EXT

SPKR

SYSTEM REGULATOR

1

2

3

4

5

67

+

-

MADE IN CANADA

COMMON AIR

ANTENNA A

RX A

TX A

INTERFACE

P25 DIGITAL OR

ANALOG SUBSCRIBER

ANALOG 2 OR 4 WIRE AUDIO AND TONES

NALOG TONE REMOTE

CONSOLE

(LEASED TELEPHONE LINES)

Figure 1: Analog Tone Remote Interface

TELEX

X

TX

+

­X

S

X

-

+

D

IO R

IO

S

TX

E R

E TX

N

D

D

S

TX

TX

O

RX

A

A

TC

IO R

IO TX

I

S

E

E

E

OU

LIN

LIN

R

R

C

D

D

D

A

TC

A

A

IN

IN

IN

L

R

C

L

R

GR

R

L

PTT IC

ANALOG AUDIO INTERFACE

TRANSMITTER

P25 BASE
CONTROL

FREQUENCY (MHz)

RX A

AD

REF

A

IN

5

13

BNK

NORM
OFF

B

KEY TX

9

ANALOG

MICMODE

DIGITAL

TX A

A

5

13

BNK

USB

B

9

TX A TX B

CNTL

Secure

BUS

Clear

Local

MIC RF OUT

Enable

Disable

Zeroize

Key

PULL DOWN
TO REMOVE

MADE IN CANADA

MODEL # CODE

CODAN RADIO SYSTEM WITH AUDIO CARD

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.

TELEX IP-223 OR IP-224

IP-223

IC

TX

LINE

LNK

IP REMOTE ADAPTER

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

RF NI

CNTL
BUS

MADE IN CANADA

MODEL # CODE

OR BASE CONTROL CARD

SPKR

FUNCTION

12

11

10

9

8

VOL METER

ON
OFF

INT
EXT

EXT

SPKR

SYSTEM REGULATOR

67

+

-

COMMON AIR

ANTENNA A

1

2

3

4

5

RX A

TX A

MADE IN CANADA

INTERFACE

P25 DIGITAL OR

ANALOG SUBSCRIBER

TELEX IP BASED

CONSOLE

LAN / WAN

TELEX PROPRIETARY DIGITAL IP INTERFACE

TELEX

HANDSET

X

X

X-

GND

TX-

TX

TX+

TX+

T

R

T

RX

RADIO 1 RADIO 2

ANALOG AUDIO INTERFACE

TRANSMITTER

P25 BASE
CONTROL

FREQUENCY (MHz)

RX A

AD

REF

A

IN

5

13

BNK

NORM
OFF

B

KEY TX

9

ANALOG

MICMODE

DIGITAL

TX A

A

5

13

BNK

USB

B

9

TX A TX B

CNTL

Secure

BUS

Clear

Local

MIC RF OUT

Enable

Disable

Zeroize

Key

PULL DOWN
TO REMOVE

MADE IN CANADA

MODEL # CODE

CODAN RADIO SYSTEM WITH AUDIO CARD

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.

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TECHNICAL NOTES

MT-4 Radio Systems

TN151 Base Station Interface Connections

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.

COMMON AIR

INTERFACE

LAN / WAN

P25 DIGITAL OR

MOTOROLA CENTRACOM

MOTOROLA PROPRIETARY DIGITAL IP INTERFACE

GOLD ELITE CONSOLE

Figure 3: Proprietary IP Network Interface

MOTOROLA QUANTAR

ANALOG SUBSCRIBER

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.

TRANSMITTER

P25 DFSI CONSOLE

LAN / WAN

P25 DIGITAL FIXED STATION INTERFACE

UIC

ETHERNET

TX A

RX A

ZEROIZE

KEY

TX B

RX B

PULL DOWN
TO REMOVE

RECEIVER

FREQUENCY (MHz)

FREQUENCY (MHz)

AD

AD
REF
IN

NORM

SQ. DISABLE
OFF
KEY TX

NORM
ANALOG

MICMODE

DIGITAL

OFF

REF

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

IN

USB

RF NI

CNTL
BUS

MADE IN CANADA

MODEL # CODE

CNTL
BUS

CODAN RADIO SYSTEM WITH UIC

SPKR

FUNCTION

12

11

10

9

8

VOL METER

ON
OFF

INT
EXT

EXT

SPKR

SYSTEM REGULATOR

1

2

3

4

5

67

+

-

MADE IN CANADA

ANTENNA A

RX A

TX A

COMMON AIR

INTERFACE

P25 DIGITAL OR

ANALOG SUBSCRIBER

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 IP connection 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 defi ned in the TIA-102 standards such as Radio Inhibit, Call Alert, 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.

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TN152 Linked Repeater Networks

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.

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TN152 Linked Repeater Networks

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.

To / From
Subscribers

To / From
Subscribers

Site 1 Site 2

Drop

Tx-F1

Rx-F2

Figure 2: Network of Two Repeaters

Switched link

Tx-F3

Rx-F4

Switched link

Tx-F4

Rx-F3

Drop

Tx-F5

Rx-F6

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TN152 Linked Repeater Networks

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.

To / From
Subscribers

Site 1 Site 2

Drop Switched link

Tx-F1
Rx-F2

To / From
Subscribers

Site 3

Drop

Tx-F3
Rx-F4

Site 4

Repeating

link

Tx-F4
Rx-F3

Switched link

Tx-F3
Rx-F4

Drop

Tx-F7
Rx-F8

To / From
Subscribers

DropSwitched link

Tx-F5
Rx-F6

To / From
Subscribers

Tx-F9
Rx-F10

Figure 3: Network of Four Repeaters

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TN152 Linked Repeater Networks

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.

To / From
Subscribers

Site 1

Drop

Tx-F1

Rx-F2

Switched link

Tx-F7

Rx-F8

Figure 4: Repeater Network with Multiple Links

Drop

Tx-F3

Rx-F4

Switched link

Tx-F8

Rx-F7

To / From
Subscribers

Site 2 Site 3

Switched link

Tx-F10

Rx-F9

To / From
Subscribers

Drop

Tx-F5

Rx-F6

Switched link

Tx-F9

Rx-F10

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TN160 Base Station or Link Confi guration Settings

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-PNL­AUX96-3 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

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TN160 Base Station or Link Confi guration Settings

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.

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TN175 MT-4E Firmware Upgrading

Codan Communications allows customers to upgrade the fi rmware of their MT-4E Receivers and Transmitters
via the Firmware Flashing Software and Firmware Upgrade fi les. The Firmware Flashing Software and Firmware
upgrade fi les are all available at the Codan website www.codancomms.com under Support - Software & Firmware.

It is not necessary to upgrade the fi rmware if the equipment is installed and is operating satisfactory. A fi rmware
upgrade is typically only needed to fi x minor software bugs or to upgrade the functionality of the equipment.

Firmware versions earlier than 1.6.0 must be returned to the factory for upgrading. Firmware version 1.6.0 and

1.7.0 may need to be returned to the factory for minor hardware upgrades. Contact the Codan service department

for more information.

Instructions

Please read all of these instructions before beginning the Firmware Flashing process.

Download the Firmware Flashing Software and appropriate Firmware upgrading fi les to a PC running a Windows
XP (or higher) operating system before beginning the upgrading procedure.

Choosing the Appropriate Firmware Upgrading Files

MT-4E Receivers and Transmitters can be purchased as an analog radio, or they can be purchased with the P25
Digital radio fi rmware package. If the radio is Analog only, download the Analog fi rmware upgrade, if it is P25 Digital
(and Analog) capable, download the Digital fi rmware upgrade. To determine if the MT-4E Receiver or Transmitter
is Analog only or P25 Digital, read the fi rmware version of the module using the Firmware Flashing Software or the
Radio Service Software as shown in Figure 1. If the last digit of the fi rmware version is an “a” or “0”, the fi rmware is
Analog only, if the last digit is a “d” or “1”, the fi rmware is P25 Digital and Analog.

NOTE: The Firmware Flashing Software will not allow you to program an MT-4E Receiver or Transmitter with the

wrong fi rmware upgrade

Figure 1: Version Number Examples

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TN175 MT-4E Firmware Upgrading

Download the latest fi rmware version (Analog or Digital) from the website for both the receiver and transmitter. If
the current fi rmware version of the MT-4E Receiver or Transmitter is 1.6.0 or 1.7.0, an additional Bootloader and
Version 2.0.0 fi rmware (Analog or Digital) will also need to be downloaded.

Using the Firmware Flashing Software

Start the Firmware Flashing Software application and turn on the MT-4E Receiver or Transmitter. Using a USB type
A to 5 pin mini-type B cable (the same USB cable used to program the modules), connect the USB port of the PC
to the USB port on the front panel of the MT-4E Receiver or Transmitter module as shown in Figure 2.

NORM
OFF
KEY TX
ANALOG
DIGITAL

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

RF NI

CNTL
BUS

MADE IN CANADA

MODEL # CODE

SYSTEM REGULATOR

12

11

10

9

8

VOL

ON
OFF

SPKR

INT
EXT

EXT

SPKR

FUNCTION

67

+

METER

-

MADE IN CANADA

1

2

3

4

5

POWER

ON

OFF

USB CABLE

REPEATER

CONTROL

SWITCH A SWITCH B

15

13

11

9

TRANSMITTER

FREQUENCY (MHz)

AD

REF

15

3

3

IN

5

11

7

7

9

MICMODE

TX A

USB

RX A

CNTL
BUS

TX B

MIC RF OUT

RX B

PULL DOWN
TO REMOVE

MADE IN CANADA

MODEL # CODE

Figure 2: PC to Radio USB Connection

An information window will appear stating that the existing fi rmware in the radio is out of date and needs to be
upgraded. Click OK to close this window.

If the current fi rmware version of the MT-4E Receiver or Transmitter is 1.6.0 or 1.7.0 a Bootloader dialog box will
appear. See the section on upgrading Firmware version 1.6.0 and 1.7.0. If the current fi rmware version is 2.1.0 or
higher, the Firmware Flashing Software can upgrade the fi rmware immediately to the next fi rmware version without
the Bootloader.

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TN175 MT-4E Firmware Upgrading

Flashing the Firmware

To apply the fi rmware upgrade (or Bootloader), click on File - Open and navigate to the directory where the fi rmware
upgrades are stored on your PC. Load the appropriate update fi le (Transmitter / Receiver; Analog only / Digital and
Analog; Bootloader / Firmware Version) as shown in Figure 3.

Figure 3: Firmware Flashing Software Example.

Click on the Program button to start the fi rmware update process. A dialog box will appear asking confi rmation to
proceed with the fi rmware update. A dialog box will also appear cautioning against interrupting the fl ashing process
in any way while the fi rmware is being updated. This is very important as any interruptions could cause the fi rmware
in the radio to be corrupted. Click on OK to proceed with the fi rmware update.

At the conclusion of the update the radio may need to be manually reset by cycling power to the module.

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TN175 MT-4E Firmware Upgrading

Upgrading Firmware version 1.6.0 and 1.7.0

If the current fi rmware version of the MT-4E Receiver or Transmitter is 1.6.0 or 1.7.0, a dialog box will appear as
shown in Figure 4, warning that the fi rmware is out of date and will require the Bootloader.

Figure 4: Version 1.6.0 and 1.7.0 Warning Dialog Box

Once the Bootloader is applied, the module’s fi rmware will appear as version 0.0.0. Firmware Version 2.0.0 is
required to be installed next and a dialog box will appear as shown in Figure 5.

Figure 5: Bootloader Warning Dialog Box

When installing Version 2.0.0, another dialog box will appear as shown in Figure 6, warning that the Bootloader
must have been applied before proceeding.

Figure 6: Version 2.0.0 Warning Dialog Box

Bringing the MT-4E Receiver or Transmitter module up to Firmware Version 2.0.0 is a two-step process, which is
required in order to apply any further fi rmware upgrades. Once this two-step process is completed, it will not be
required again. Firmware Version 2.0.0 is a “blank” fi rmware version and must be upgraded to the latest fi rmware
in order for the module to operate.

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TN180 P25 Digital Ping Feature

A conventional radio system requires the users to set the subscriber radio on the frequency pair of the nearest
repeater by manually turning the channel selector knob. This requires more training and attention on the part of
the radio user.

Subscriber radios can be programmed to scan the repeater transmit frequencies to lock onto the repeater when it
is transmitting. Standard scanning results in the subscriber selecting and using the fi rst channel in the scan list it
fi nds an active (transmitted) signal. Since the repeater talk-out range is generally greater than the subscriber talk­in range, standard scanning does not always result in the optimal channel (typically the closest repeater) for the
subscriber to operate on.

In Vote Scan operation, each channel is qualifi ed by measuring the received signal strength of each repeater at
the subscriber radio. The subscriber then votes from the repeater sites, selecting either the best signal or the fi rst
signal that exceeds a pre-programmed received level threshold.

In order to keep the subscriber locked onto the best (typically closest) repeater site when the subscriber is keyed,
the repeaters need to have traffi c on the transmitter regularly. Since the radio users may not have consistent radio
traffi c, a Codan repeater can be programmed to ping after an inactive time interval allowing the vote-scanning
subscriber radios to lock onto the best repeater. The ping uses the P25 standard “silent” message, so that users
will not hear the radio traffi c, but it will activate the vote-scan capability in the subscriber.

The optional digital ping software timer is confi gured to key the transmitter after a specifi ed time (interval) with no
activity, with a message of programmable duration (length) as shown in Figure 1.

Figure 1: Optional P25 Digital Ping Feature

Ping Interval range: 10 sec to 120 secs.
Ping Length: 1 sec to 15 secs (rounded to nearest LDU length – 180 mS)
The maximum Ping Length is less than 50% Ping Interval. e.g. Ping length < 5s if Ping interval set to 10s.

Setting the Ping Interval to a small value and the Ping Length to a large value will cause excessive network traffi c.

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MT-4 Radio Systems

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TN181 Adjustable Courtesy Tone

An Adjustable Courtesy Tone option allows customization of the courtesy tone transmitted at the end of an analog
or P25 Digital transmission. The Adjustable Courtesy Tone is available in addition to the Fixed Courtesy Tone
implementation. The Radio Service Software (RSS) allows selection of either the fi xed or Adjustable Courtesy
Tone. If the Adjustable Courtesy Tone feature is disabed, the hang timer / courtesy tone will revert to it’s previous
(older fi rmware) method of programming and operation. This selection is made under Service->Courtesy Tone.

The Adjustable Courtesy Tone feature requires transmitter fi rmware version 2.10.9 (or higher) and RSS version

1.7.6 (or higher).

Figure 1: Adjustable Courtesy Tone

With the Adjustable Courtesy Tone, users may set diff erent courtesy tone settings for the following scenarios:

• transmission is shorter than a user programmable length

• transmission is longer than a user programmable length

• 13.8 Volt line (Supply Voltage) is below (or above) user programmable threshold #1.

• 13.8 Volt line (Supply Voltage) is below (or above) user programmable threshold #2.

• Courtesy Tone when input pin B14 or Z14 on the Transmitter module is asserted.

This is the MT-3 PTT NTO pin. Accessible as J1-3 (TX A PTT) for TXA and J1-11 (TX B PTT) for TXB on the
back panel Auxiliary connector (P1). Also, JU21 must be installed in the A position for TXA and JU20 must be
installed in the A position for TXB.

• Loss of Network condition

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TN181 Adjustable Courtesy Tone

Setting the Adjustable Courtesy Tone

The priority level of each scenario can be independantly selected, or any scenarios can be individually disabled.
The priority arrangement must be the same for both analog and P25 digital mode.

The courtesy tone operation consists of 2 tones. Both tones can be programmed the same or diff erently or as
silent.

To have a silent tone in analog mode, simply set the volume of the tone to “0” or set the tone to 0 Hz. To have a
silent tone in P25 digital mode, set the tone frequency to 0 Hz.

The courtesy tone generated in analog mode is done after the pre-emphasis stage of the signal processing
chain of the transmitter. Therefore it will always come out as fl at audio response. Separate volumes controls are
provided for the fi rst and second tones in cases where the listening receiver is using de-emphasis.

In P25 mode, the following hang time behaviors are off ered:

• Silent Voice Frame Only

• Silent Voice Frame + Tone

• Simple Terminator Data Unit only (typically used for P25 encrypted calls)

• Simple Terminator Data Unit + Tone (typically used for P25 encrypted calls)

Sample tone setup for the Adjustable Courtesy Tone:

- Set the “Adjustable Courtesy Tone” option to ‘Enable’.

- Set the “Battery Reading Level 1 Trigger” to the low voltage trigger point. Such as 10 Vdc

- Set the “Battery Reading Level 2 Trigger” to the High voltage trigger point. Such as 17 Vdc

- In the Analog table set the two tones and level for the Battery Level 1 and 2.

- Set the Priority to 1 and all other priorities to 0 if the other settings are not used.

The transmitter will now send a two tone at the end of a transmission if the voltage goes below or above the
indicated voltage trigger point.

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TN182 Battery Level Reporting and Remote P25 Test Tone

Battery Level Reporting is a method of activating a repeater remotely to have it transmit a signal that reports the
battery voltage level over RF. The Remote P25 Test Tone is a remotely activated Standard 1011 Hz P25 test tone
transmitted out of a repeater that allows a mobile coverage test to be done with a receiver performing a P25 Bit
Error Rate test.

Both the Battery Level Reporting and Remote P25 Test Tone are only available in a repeater confi guration with
a receiver connected to a transmitter through the front panel RJ45 Control bus. It can be a direct connection, or
through a CI-RC-4L repeater controller or a CI-RC-4M-G2 Multiple Link Controller. The Battery Level Reporting
and Remote P25 Test Tone are activated by a DTMF signal sent over RF to the repeater receiver.

The Battery Level Reporting and Remote P25 Test Tone features requires transmitter fi rmware version 2.10.9 (or
higher), receiver fi rmware version 2.9.8 (or higher) and RSS version 1.7.6 (or higher).

Battery Level Reporting

When the receiver receives a DTMF code of ##123 (or any three-digit programmed ID code), it will initiate the
transmitter with the corresponding three digit value (ID code of 123) to key up and transmit the battery level.

• The battery level is measured internally by the transmitter every two seconds.

• The battery reporting transmission can be stopped by another PTT from a subscriber radio.

• A DC off set adjustment (of the 13.8V line reading) is required for each transmitter. The procedure of this adjustment

is described in Battery Level Reporting DC Off set Adjustment Procedures.

Analog Mode

In analog mode, an audio tone that corresponds to the battery level of the repeater system is transmitted. For
example, a 1380 Hz tone transmitted over the air corresponds to a battery level of 13.80 Vdc.

• The duration of the reporting transmission is user programmable but has to be at least ten seconds.

• The deviation of the analog tone can be adjusted in the software as the tone volume.

P25 Digital Mode

In P25 digital mode a DTMF tone sequence that corresponds to the battery level of the repeater system is
transmitted. The battery level reporting is a DTMF tone sequence in the following format (in P25):

• Example - B125A123

• B marks the beginning of the battery level.

• The three 0 to 9 digits make up the battery level reporting.

• B125 means battery level of 12.5 Vdc

• A marks the beginning of the ID code of the transmitter reporting the battery level.

• The three 0 to 9 plus A, B, C, D digits is the ID code of the transmitter that reported the battery level.

• The number of times the battery report string transmits is user programmable but has to be at least two times.

• The duration of the silent P25 frame gap between each DTMF sequence is user programmable.

• The P25 Digital DTMF tone sequence volume can be adjusted in the tone volume.

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TECHNICAL NOTES

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TN182 Battery Level Reporting and Remote P25 Test Tone

Figure 1: Transmitter Battery Level Reporting

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TECHNICAL NOTES

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TN182 Battery Level Reporting and Remote P25 Test Tone

Remote Keying of 1011 Hz P25 Test Tone

This feature is only applicable to P25 digital mode. When the receiver receives a DTMF code of **123 (or any
three-digit programmed ID code), it will initiate the transmitter with the corresponding three digit value (ID code of

123) to key up and transmit the1011 Hz P25 Test Tone.

• ** marks the beginning of a DTMF command code for requesting remote keying of 1011 Hz test tone in P25 mode.

• The three 0 to 9 plus A, B, C, D digits is the ID code of the transmitter being requesting to do the remote keying

of 1011 test tone.

• The duration of the 1011 Hz P25 test tone transmission is user programmable (can be set to infi nite).

• The 1011 Hz P25 test tone transmission can be stopped by another PTT from a subscriber radio.

• The pattern being generate is the Standard Tone Test Pattern as per TIA-102.CAAA Section 1.3.3.7 a).

• This feature must be enabled via RSS for both the receiver and transmitter.

Figure 2: Transmitter Remote 1011 Test Tone

Figure 3: Receiver Remote 1011 Test Tone

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TECHNICAL NOTES

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TN182 Battery Level Reporting and Remote P25 Test Tone

Subscriber DTMF Requirements

In P25 digital mode, the subscriber is required to have the capability to generate DTMF in P25 Digital mode (not
all P25 equipment supports this capability).

In analog mode the DTMF implementation can vary between diff erent models of subscriber. As a consequence,
the analog DTMF decoder of each repeater receiver is required to be tuned to work with a particular subscriber
model. The procedure for this adjustment is described in the Receiver Analog DTMF Decoder Alignment Proce­dures.

More than one subscriber manufacturer / model may work, but to guarantee the best operation the most common
subscriber should be used to tune this feature. This is an issue with subscribers that Codan tries best to accom­modate.

The subscriber and repeater also need to match the use of pre/de-emphasis or fl at audio.

Battery Level Reporting DC Off set Adjustment Procedures

Tools Required:

DC volt meter
RSS version 1.7.6 or later

Steps:

1. Power up the transmitter.

2. Make sure the transmitter is not transmitting (keyed).

3. Connect to RSS via a USB cable.

4. Navigate to Service -> Extra Feature -> Battery Level Reporting (Tab)

5. Enable (and program) Battery Level Reporting if it is not already enabled.

6. Have the DC volt meter monitor the 13.8V line of the transmitter. Monitor this voltage where you would like the

battery reading to be taken from, for example, via the System Regulator (Monitor).

7. Click Read 13.8V line Button.

8. Adjust the Battery Reading Off set Adjustment fi eld until the Battery Reading in the RSS matches the battery level

on the DC voltmeter.

9. Repeat Steps 7 and 8 until the reading matches that of the DC voltmeter. (Allow 3 seconds between each click

of the Read Battery Voltage button. The transmitter internally only takes a reading every 2 seconds.)

10. Click Program to save the value.

11. Exit out of RSS.

Note: The calibration procedure is done with the transmitter under very little load. When the transmitter is transmitting,
the reading will be lower in comparison with the reading at the system regulator.

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TECHNICAL NOTES

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TN182 Battery Level Reporting and Remote P25 Test Tone

Receiver Analog DTMF Decoder Alignment Procedures:

Tools Required:

Oscilloscope
Optional: Analog communication test set (eg. Marconi 2955)
RSS version 1.7.6 or later
Extender card
The subscriber model to be used with the receiver

Steps:

1. Connect the receiver to the sub-rack with the extender card or cable in between.

2. Have the Oscilloscope monitor Pin Z24 out of the back 48 pin connector of the receiver via the extender card.

J4-10 (RX A MODE) for RXA and J4-14 (RX B MODE) for RXB.

3. Do NOT connect a transmitter to the receiver via the front panel CNTL BUS.

4. Use RSS to program the repeater receiver to match the bandwidth and de-emphasis settings of the subscriber

(this is typically done for radio operation).

5. Navigate to Service -> Jumper Settings -> Output Pins.

6. Note the current selection for Pin Z24. You will need to program it back after tuning.

7. Select and Program “Analog DTMF Decode (High)” for Pin Z24 as shown in Figure 4.

Figure 4: DTMF Setup Output Pin Selection

8. Exit back to Service Window.

9. Select Extra Features.

10. Select Battery Level Reporting Tab

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TECHNICAL NOTES

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TN182 Battery Level Reporting and Remote P25 Test Tone

12. Turn on the Battery Level Reporting and click program if it is not already on.

The following values are a good starting point
5 : Detection Threshold for First Harmonics
100: Input Audio Sample Gain (Narrow Band)
100: Input Audio Sample Gain (Wide Band)

Figure 5: Receiver Battery Level Reporting

13. Use the subscriber to transmit each DTMF tone. As an Option you can have an analog communication test

monitor the subscriber at the same time with the demod output connected to one of the oscilloscope channels.

14. Figure 6 shows what the output at Pin Z24 looks like when it is tuned correctly for a particular subscriber.

A single pulse will correspond to each burst of diff erent DTMF tone.

Figure 6: Oscilloscope showing DTMF output on Pin Z24 (Good Tune)

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TN182 Battery Level Reporting and Remote P25 Test Tone

15. Figure 7 shows what the output at Pin Z24 may look like when it is not tuned correctly for a particular

subscriber.
More than a single pulse will correspond to some of the bursts of diff erent DTMF tones.
You will sometimes see no pulse corresponding to some of the burst of diff erent DTMF tones.

Figure 7: Oscilloscope showing DTMF output on Pin Z24 (Bad Tune)

16. Make the adjustment to the Detection Threshold for First Harmonics and/or the Input Audio Sample Gain so that

the result looks like Figure 6. Be sure to go through all possible DTMF tones.

17. Click Program to save the adjustment value.

18. Navigate to Service -> Jumper Settings -> Output Pins

19. Program back the previous setting for Pin Z24.

20. Exit RSS.

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TECHNICAL NOTES

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TN182 Battery Level Reporting and Remote P25 Test Tone

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TN247 VR-4E VHF MT-4E Receiver

TECHNICAL NOTES

MT-4 Radio Systems

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

CNTL
BUS

RF NI

The VR-4E VHF receiver is an FM radio module capable of analog operation in 12.5 KHz
(narrowband) or 25 KHz (wideband) channels. A fi rmware upgrade may be purchased to
allow P25 digital operation. The VR-4E VHF receiver operates over the frequency band
from 136 to 174 MHz. A modular design allows each of the receiver’s internal modules to be
individually assembled and tested. This facilitates construction, tuning and maintenance as
well as troubleshooting procedures. The receiver can be programmed with up to 2 banks of
16 channels each.

MADE IN CANADA

MODEL # CODE

Specifi cations

Frequency Band 136 - 174 MHz
Channel Spacing 12.5, 15, 25 and 30 KHz
Frequency Switching Range ± 2 MHz
Reference Sensitivity ≤ -118 dBm (.280 μV)
(12 dB SINAD and 5% BER)
Adjacent Channel Rejection (Class A) ≥ 45 dB; NB Analog / ≥ 75 dB; WB Analog / ≥ 60 dB; Digital
Adjacent Channel Rejection (Class B) ≥ 40 dB; NB Analog / ≥ 70 dB; WB Analog / ≥ 60 dB; Digital
Conducted Spurious Output Power (Analog) ≤ -95 dBm (Class A) / ≤ -57 dBm (Class B)
Intermodulation Rejection ≥ 75 dB Analog / ≥ 80 dB Digital (Class A)
≥ 70 dB Analog / ≥ 70 dB Digital (Class B)
Hum & Noise Ratio ≥ 34 dB Narrowband / ≥ 40 dB Wideband
L.O. Frequency Stability ± 1.0 ppm (-30°C to +60°C)
Audio Distortion (Analog and Digital) ≤ 2.0 % (25°C); ≤ 3.0 % (-30°C to +60°C)
Audio Output Level (600  Balanced) ≤ +3.0 dBm
Operating Temperature -30°C to +60°C
Supply Current (Class A) ≤ 250 mA / ≤ 280 mA with encryption module
Supply Current (Class B) ≤ 115 mA / ≤ 145 mA with encryption module

Models Available

VR-4E150-A0-000 12.5 / 25 KHz Bandwidth, 136 - 174 MHz, Class A
VR-4E150-00-000 12.5 / 25 KHz Bandwidth, 136 - 174 MHz, Class B

Receiver Operating Frequency

The receiver is initially aligned at the factory for the frequency shown on the label on the front panel. For a small
frequency change, no re-alignment of the receiver may be required. If the frequency change is greater than ±2 MHz
from the frequency at which the last complete receiver alignment was performed, the RF Preselector will need to
be realigned. To align and / or adjust the receiver, the outer cover needs to be removed; the receiver needs to be
plugged into the subrack via a cable and / or extender card; and power must be applied to the system.

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TN247 VR-4E VHF MT-4E Receiver

TECHNICAL NOTES

MT-4 Radio Systems

The VR-4E VHF receiver is primarily software-controlled, allowing tuning, programming and maintenance to be
done via software service with few hardware adjustments required.

RF Preselector Alignment:

Alignment for the RF Preselector consists of tuning the fi ve-section helical fi lter only. There are two methods of
tuning the RF Preselector. The preferred method of tuning the RF Preselector is to use a Spectrum Analyzer with
a Tracking Generator. Ensure that the +9.5 Vdc supply is connected to the RF Preselector (red wire). Connect the
Tracking Generator output at a level of -20 dBm to the Receiver’s RF input. Connect the Spectrum Analyzer input to
the RF Preselector’s IF output (SMB cable normally connected to the Receiver Mainboard). Adjust the helical fi lter
trimmer capacitors for a fl at response at a level typically -40 dBm to -65 dBm, centred at the desired RF frequency.
The alternate method of tuning the RF Preselector is to monitor receiver SINAD. Inject the desired RF signal to the
RF input connector at a level of -118 dBm and adjust the helical fi lter trimmer capacitors for best receiver SINAD (≤

-118 dBm).

RSS Service Mode:

The RSS has the ability to put a receiver into Service Mode, where the Reference Oscillator may be aligned, Audio
Levels may be set, Jumper Settings may be selected, a BER test can be performed, and an RSSI meter can be
monitored. To put the receiver into Service Mode, it must be connected to a PC running the Radio Service Software
(RSS) using a type A to 5-pin mini-type B USB cable. From the RSS Receiver Confi guration window, click on the
Service button. Note that you must not remove power to the radio or swap radios during servicing. When any
required Service functions have been completed, the radio can be taken out of Service Mode by clicking on the Quit
button in the Service window.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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TN267 UR-4E UHF MT-4E Receiver

TECHNICAL NOTES

MT-4 Radio Systems

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

CNTL
BUS

RF NI

The UR-4E UHF receiver is an FM radio module capable of analog operation in 12.5 KHz
(narrowband) or 25 KHz (wideband) channels. A fi rmware upgrade may be purchased to allow
P25 digital operation. The UR-4E UHF receiver operates in one of fi ve frequency bands: 380
to 406 MHz, 406 to 430 MHz, 430 to 450 MHz, 450 to 470 MHz or 470 to 520 MHz. A modular
design allows each of the receiver’s internal modules to be individually assembled and tested.
This facilitates construction, tuning and maintenance as well as troubleshooting procedures.
The receiver can be programmed with up to 2 banks of 16 channels each.

MADE IN CANADA

MODEL # CODE

Specifi cations

Frequency Bands 380 - 406 / 406 - 430 / 430 - 450 / 450 - 470 / 470 - 520 MHz
Channel Spacing 12.5 and 25 KHz
Frequency Switching Range ± 2 MHz
Reference Sensitivity ≤ -116 dBm (.350 μV) 380 & 440 & 500
(12 dB SINAD and 5% BER) ≤ -118 dBm (.280 μV) 420 & 460
Adjacent Channel Rejection (Class A) ≥ 45 dB; NB Analog / ≥ 75 dB; WB Analog / ≥ 60 dB; Digital
Adjacent Channel Rejection (Class B) ≥ 40 dB; NB Analog / ≥ 70 dB; WB Analog / ≥ 60 dB; Digital
Conducted Spurious Output Power (Analog) ≤ -95 dBm (Class A & 380 & 440) / ≤ -80 dBm (500)
≤ -57 dBm (Class B)
Intermodulation Rejection ≥ 75 dB Analog / ≥ 80 dB Digital (Class A & 380 & 440)
≥ 70 dB Analog / ≥ 70 dB Digital (Class B)
Hum & Noise Ratio ≥ 34 dB Narrowband / ≥ 40 dB Wideband
L.O. Frequency Stability ± 0.5 ppm (-30°C to +60°C)
Audio Distortion (Analog and Digital) ≤ 2.0 % (25°C); ≤ 3.0 % (-30°C to +60°C)
Audio Output Level (600  Balanced) ≤ +3.0 dBm
Operating Temperature -30°C to +60°C
Supply Current (Class A) ≤ 250 mA / ≤ 280 mA with encryption module
Supply Current (Class B) ≤ 115 mA / ≤ 145 mA with encryption module
Supply Current (380 & 440) ≤ 270 mA / ≤ 300 mA with encryption module

Models Available

UR-4E380-00-000 12.5 / 25 KHz Bandwidth, 380 - 406 MHz, Class B
UR-4E420-A0-000 12.5 / 25 KHz Bandwidth, 406 - 430 MHz, Class A
UR-4E420-00-000 12.5 / 25 KHz Bandwidth, 406 - 430 MHz, Class B
UR-4E440-00-000 12.5 / 25 KHz Bandwidth, 430 - 450 MHz, Class B
UR-4E460-A0-000 12.5 / 25 KHz Bandwidth, 450 - 470 MHz, Class A
UR-4E460-00-000 12.5 / 25 KHz Bandwidth, 450 - 470 MHz, Class B
UR-4E500-00-000 12.5 / 25 KHz Bandwidth, 470 - 520 MHz, Class B * Not available in Canada

Receiver Operating Frequency

The receiver is initially aligned at the factory for the frequency shown on the label on the front panel. For a small
frequency change, no re-alignment of the receiver may be required. If the frequency change is greater than ±2 MHz
from the frequency at which the last complete receiver alignment was performed, the RF Preselector will need to
be realigned. To align and / or adjust the receiver, the outer cover needs to be removed; the receiver needs to be
plugged into the subrack via a cable and / or extender card; and power must be applied to the system.

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TN267 UR-4E UHF MT-4E Receiver

TECHNICAL NOTES

MT-4 Radio Systems

The UR-4E UHF receiver is primarily software-controlled, allowing tuning, programming and maintenance to be
done via software service with few hardware adjustments required.

RF Preselector Alignment:

Alignment for the RF Preselector consists of tuning the fi ve-section helical fi lter only. There are two methods of
tuning the RF Preselector. The preferred method of tuning the RF Preselector is to use a Spectrum Analyzer with
a Tracking Generator. Ensure that the +9.5 Vdc supply is connected to the RF Preselector (red wire). Connect the
Tracking Generator output at a level of -20 dBm to the Receiver’s RF input. Connect the Spectrum Analyzer input
to the RF Preselector’s IF output (SMB cable normally connected to the Receiver Mainboard). Adjust the helical
fi lter trimmer capacitors for a fl at response at a level typically -40 dBm to -65 dBm (-20 dBm to -40 dBm for Class
B), centred at the desired RF frequency. The alternate method of tuning the RF Preselector is to monitor receiver
SINAD. Inject the desired RF signal to the RF input connector at a level of -118 dBm and adjust the helical fi lter
trimmer capacitors for best receiver SINAD (≤ -118 dBm).

RSS Service Mode:

The RSS has the ability to put a receiver into Service Mode, where the Reference Oscillator may be aligned, Audio
Levels may be set, Jumper Settings may be selected, a BER test can be performed, and an RSSI meter can be
monitored. To put the receiver into Service Mode, it must be connected to a PC running the Radio Service Software
(RSS) using a type A to 5-pin mini-type B USB cable. From the RSS Receiver Confi guration window, click on the
Service button. Note that you must not remove power to the radio or swap radios during servicing. When any
required Service functions have been completed, the radio can be taken out of Service Mode by clicking on the Quit
button in the Service window.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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TECHNICAL NOTES

MT-4 Radio Systems

TN287 UR-4E UHF 700 / 800 / 900 MHz MT-4E Receiver

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

CNTL
BUS

RF NI

The UR-4E UHF 700 / 800 / 900 MHz receiver is an FM radio module capable of analog
operation in 12.5 KHz (narrowband) or 25 KHz (wideband) channels. A fi rmware upgrade may
be purchased to allow P25 digital operation. The UR-4E UHF 700 / 800 / 900 MHz receiver
operates in one of fi ve frequency bands: 768 to 776 MHz, 798 to 824 MHz, 851 to 869 MHz,
896 to 902 MHz or 930 to 960 MHz. A modular design allows each of the receiver’s internal
modules to be individually assembled and tested. This facilitates construction, tuning and
maintenance as well as troubleshooting procedures. The receiver can be programmed with

MADE IN CANADA

MODEL # CODE

up to 2 banks of 16 channels each.

Specifi cations

Frequency Bands 768 - 776 / 798 - 824 / 851 - 869 / 896 - 902 / 930 - 960 MHz
Channel Spacing 12.5 and 25 KHz
Frequency Switching Range Full Band
Reference Sensitivity ≤ -116 dBm (.350 μV)
(12 dB SINAD and 5% BER)
Adjacent Channel Rejection ≥ 45 dB; NB Analog / ≥ 70 dB; WB Analog / ≥ 60 dB; Digital
Conducted Spurious Output Power (Analog) ≤ -80 dBm
Intermodulation Rejection ≥ 70 dB
Hum & Noise Ratio ≥ 31 dB Narrowband / ≥ 37 dB Wideband
L.O. Frequency Stability ± 0.1 ppm (-30°C to +60°C)
Audio Distortion (Analog and Digital) ≤ 3.0 % (25°C); ≤ 5.0 % (-30°C to +60°C)
Audio Output Level (600  Balanced) ≤ +3.0 dBm
Operating Temperature -30°C to +60°C
Supply Current ≤ 200 mA / ≤ 230 mA with encryption module

Models Available

UR-4E768-00-000 12.5 / 25 KHz Bandwidth, 768 - 776 MHz, Class B
UR-4E800-00-000 12.5 / 25 KHz Bandwidth, 798 - 824 MHz, Class B
UR-4E850-00-000 12.5 / 25 KHz Bandwidth, 851 - 869 MHz, Class B
UR-4E900-00-000 12.5 / 25 KHz Bandwidth, 896 - 902 MHz, Class B
UR-4E950-00-000 12.5 / 25 KHz Bandwidth, 930 - 960 MHz, Class B

Receiver Operating Frequency

The receiver is initially aligned at the factory for the center of the frequency range and is programmed for the
frequency shown on the label on the front panel. No re-alignment of the receiver is required to change frequencies.

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MT-4 Radio Systems

TN287 UR-4E UHF 700 / 800 / 900 MHz MT-4E Receiver

The UR-4E UHF 700 / 800 / 900 MHz receiver is primarily software-controlled, allowing tuning, programming and
maintenance to be done via software service with few hardware adjustments required.

RSS Service Mode:

The RSS has the ability to put a receiver into Service Mode, where the Reference Oscillator may be aligned, Audio
Levels may be set, Jumper Settings may be selected, a BER test can be performed, and an RSSI meter can be
monitored. To put the receiver into Service Mode, it must be connected to a PC running the Radio Service Software
(RSS) using a type A to 5-pin mini-type B USB cable. From the RSS Receiver Confi guration window, click on the
Service button. Note that you must not remove power to the radio or swap radios during servicing. When any
required Service functions have been completed, the radio can be taken out of Service Mode by clicking on the Quit
button in the Service window.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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TN347 VT-4E VHF MT-4E Transmitter

TECHNICAL NOTES

MT-4 Radio Systems

REF

MICMODE

CNTL
BUS

IN

USB

TRANSMITTER

AD

FREQUENCY (MHz)

NORM
OFF
KEY TX
ANALOG
DIGITAL

MIC RF OUT

The VT-4E VHF transmitter is an FM radio module capable of analog operation in 12.5 KHz
(narrowband) or 25 KHz (wideband) channels. A fi rmware upgrade may be purchased to
allow P25 digital operation. The VT-4E VHF transmitter operates over the frequency band
from 136 to 174 MHz. A modular design allows each of the transmitter’s internal modules to
be individually assembled and tested. This facilitates construction, tuning and maintenance as
well as troubleshooting procedures. The transmitter can be programmed with up to 2 banks
of 16 channels each.

MADE IN CANADA

MODEL # CODE

Specifi cations

Frequency Band 136 - 174 MHz
Channel Spacing 12.5, 15, 25 and 30 KHz
Frequency Switching Range Full Band; ± 0.5 MHz for VSWR alarm
RF Output Power 0.5 to 8.0 Watts adjustable
Duty Cycle 100% (-30°C to +60°C)
Undesired Emissions (Conducted Spurious) ≤ -70 dBc @ 8.0 Watts
Undesired Emissions ≤ -60 dBc; Narrowband Analog / ≤ -70 dBc; Wideband Analog
(Adjacent Channel Power Ratio) ≤ -70 dBc; Digital
Intermodulation Attenuation ≥ 45 dB
FM Hum & Noise Ratio ≥ 42 dB; Narrowband / ≥ 48 dB; Wideband
Carrier Frequency Stability ± 1.0 ppm (-30°C to +60°C)
Emission Designators Analog: 11K0F3E (Narrowband); 16K0F3E (Wideband)
Paging: 9K20F1D
P25 Digital: 8K10F1E (Digital Voice); 8K10F1D (Digital Data)
Audio Distortion (60% of maximum deviation) ≤ 3.0% (-30°C to +60°C)
VSWR Protection ≤ 20:1 VSWR (All Phase Angles)
Operating Temperature -30°C to +60°C
Standby Current ≤ 50 mA / ≤ 80 mA with encryption module
Transmit Current (8.0 W) ≤ 2.80 A

Models Available

VT-4E150-00-800 12.5 / 25 KHz Bandwidth, 0.5 - 8.0 W, 136 - 174 MHz

Transmitter Operating Frequency

The transmitter is initially aligned at the factory for the frequency shown on the label on the front panel. For a small
frequency change, no re-alignment of the transmitter may be required. If the frequency change is greater than

±0.5 MHz from the frequency at which the last complete transmitter alignment was performed, the VSWR alarm
/ overload (if used) will need to be realigned. To align and / or adjust the transmitter, the outer cover needs to be

removed; the transmitter needs to be plugged into the subrack via a cable and / or extender card; and power must
be applied to the system. A 50  dummy load should be connected to the RF output when transmitting.

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TN347 VT-4E VHF MT-4E Transmitter

TECHNICAL NOTES

MT-4 Radio Systems

The VT-4E VHF transmitter is primarily software controlled, allowing tuning, programming and maintenance to be
done via software service with few hardware adjustments required.

VSWR Alarm / Overload Adjustment:

The VSWR alarm / overload only requires adjustment if the VSWR Alarm is being used. When the VSWR alarm /
overload circuit is properly set, the Amplifi er is protected from excessive antenna VSWR by reducing the amplifi er’s
gain when an overload condition occurs. If the VSWR alarm is not set, the amplifi er is still protected by a current
limiter circuit. The circuit limits Amplifi er current draw to 2.0 Amps and protects the Amplifi er from damage.

To set the VSWR alarm / overload circuit properly, the RF power level must be set to the desired RF power output
fi rst. After the RF power level is properly set, rotate the VSWR alarm adjust potentiometer (RV3) fully counter
clockwise. Terminate the transmitter with a 3:1 mismatch load and connect a voltmeter to Pin 5 of connector J1 in
the transmitter. Slowly adjust the VSWR alarm adjust potentiometer (RV3) clockwise until Pin 5 reads +2.5 Vdc, or
a noticeable drop (10% of total current or more) in current on the +13.8 Vdc line occurs.

RSS Service Mode:

The RSS has the ability to put a transmitter into Service Mode, where the Reference Oscillator may be aligned,
Audio Levels, Subtone Deviation Levels and RF Power Levels may be set, Jumper Settings may be selected, and
Test Patterns can be generated. To put the transmitter into Service Mode, it must be connected to a PC running
the Radio Service Software (RSS) using a type A to 5 pin mini-type B USB cable. From the RSS Transmitter
Confi guration window, click on the Service button. When any required Service functions have been completed, the
radio can be taken out of Service Mode by clicking on the Quit button in the Service window.

NOTE: Do not remove power to the radio or swap radios during servicing.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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TN367 UT-4E UHF MT-4E Transmitter

TECHNICAL NOTES

MT-4 Radio Systems

REF

MICMODE

CNTL
BUS

IN

USB

TRANSMITTER

AD

FREQUENCY (MHz)

NORM
OFF
KEY TX
ANALOG
DIGITAL

MIC RF OUT

The UT-4E UHF transmitter is an FM radio module capable of analog operation in 12.5 KHz
(narrowband) or 25 KHz (wideband) channels. A fi rmware upgrade may be purchased to
allow P25 digital operation. The UT-4E UHF transmitter operates in one of three frequency
bands: 380 to 406 MHz, 406 to 470 MHz or 470 to 520 MHz. A modular design allows each
of the transmitter’s internal modules to be individually assembled and tested. This facilitates
construction, tuning and maintenance as well as troubleshooting procedures. The transmitter
can be programmed with up to 2 banks of 16 channels each.

MADE IN CANADA

MODEL # CODE

Specifi cations

Frequency Bands 380 - 406 / 406 - 470 MHz / 470 - 520 MHz
Channel Spacing 12.5 and 25 KHz
Frequency Switching Range Full Band; ± 0.5 MHz for VSWR alarm
RF Output Power 0.5 to 8.0 Watts adjustable or 0.5 to 6.0 Watts adjustable
Duty Cycle 100% (-30°C to +60°C)
Undesired Emissions (Conducted Spurious) ≤ -70 dBc (-31 dBm @ 6 / 8 W) 380 & 450; (-32 dBm @ 6W) 500
Undesired Emissions ≤ -60 dBc; Narrowband Analog / ≤ -70 dBc; Wideband Analog
(Adjacent Channel Power Ratio) ≤ -67 dBc; Digital
Intermodulation Attenuation ≥ 40 dB (380) / ≥ 45 dB (450 & 500)
FM Hum & Noise Ratio ≥ 40 dB NB ; ≥ 46 dB WB (380) / ≥ 38 dB NB ; ≥ 44 dB WB (450)
≥ 34 dB; NB ; ≥ 40 dB; WB (500)
Carrier Frequency Stability ± 0.5 ppm (-30°C to +60°C)
Emission Designators Analog: 11K0F3E (Narrowband); 16K0F3E (Wideband)
Paging: 9K20F1D
P25 Digital: 8K10F1E (Digital Voice); 8K10F1D (Digital Data)
Audio Distortion (60% of maximum deviation) ≤ 3.0% (-30°C to +60°C)
VSWR Protection ≤ 20:1 VSWR (All Phase Angles)
Operating Temperature -30°C to +60°C
Standby Current ≤ 50 mA / ≤ 80 mA with encryption module
Transmit Current (8.0 W) ≤ 2.80 A

Models Available

UT-4E380-00-800 12.5 / 25 KHz Bandwidth, 0.5 - 6.0 W, 380 - 406 MHz
UT-4E450-00-800 12.5 / 25 KHz Bandwidth, 0.5 - 8.0 W, 406 - 470 MHz
UT-4E500-00-800 12.5 / 25 KHz Bandwidth, 0.5 - 6.0 W, 470 - 520 MHz *Not available in Canada

Transmitter Operating Frequency

The transmitter is initially aligned at the factory for the frequency shown on the label on the front panel. For a small
frequency change, no re-alignment of the transmitter may be required. If the frequency change is greater than

±0.5 MHz from the frequency at which the last complete transmitter alignment was performed, the VSWR alarm
/ overload (if used) will need to be realigned. To align and / or adjust the transmitter, the outer cover needs to be

removed; the transmitter needs to be plugged into the subrack via a cable and / or extender card; and power must
be applied to the system. A 50  dummy load should be connected to the RF output when transmitting.

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TN367 UT-4E UHF MT-4E Transmitter

TECHNICAL NOTES

MT-4 Radio Systems

The UT-4E UHF transmitter is primarily software controlled, allowing tuning, programming and maintenance to be
done via software service with few hardware adjustments required.

VSWR Alarm / Overload Adjustment:

The VSWR alarm / overload only requires adjustment if the VSWR Alarm is being used. When the VSWR alarm /
overload circuit is properly set, the Amplifi er is protected from excessive antenna VSWR by reducing the amplifi er’s
gain when an overload condition occurs. If the VSWR alarm is not set, the amplifi er is still protected by a current
limiter circuit. The circuit limits Amplifi er current draw to 2.0 Amps and protects the Amplifi er from damage.

To set the VSWR alarm / overload circuit properly, the RF power level must be set to the desired RF power output
fi rst. After the RF power level is properly set, rotate the VSWR alarm adjust potentiometer (RV3) fully counter
clockwise. Terminate the transmitter with a 3:1 mismatch load and connect a voltmeter to Pin 5 of connector J1 in
the transmitter. Slowly adjust the VSWR alarm adjust potentiometer (RV3) clockwise until Pin 5 reads +2.5 Vdc, or
a noticeable drop (10% of total current or more) in current on the +13.8 Vdc line occurs.

RSS Service Mode:

The RSS has the ability to put a transmitter into Service Mode, where the Reference Oscillator may be aligned,
Audio Levels, Subtone Deviation Levels and RF Power Levels may be set, Jumper Settings may be selected, and
Test Patterns can be generated. To put the transmitter into Service Mode, it must be connected to a PC running
the Radio Service Software (RSS) using a type A to 5 pin mini-type B USB cable. From the RSS Transmitter
Confi guration window, click on the Service button. When any required Service functions have been completed, the
radio can be taken out of Service Mode by clicking on the Quit button in the Service window.

NOTE: Do not remove power to the radio or swap radios during servicing.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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TECHNICAL NOTES

MT-4 Radio Systems

TN387 UT-4E UHF 700 / 800 / 900 MHz MT-4E Transmitter

REF

MICMODE

CNTL
BUS

IN

USB

TRANSMITTER

AD

FREQUENCY (MHz)

NORM
OFF
KEY TX
ANALOG
DIGITAL

MIC RF OUT

The UT-4E UHF 700 / 800 / 900 MHz transmitter is an FM radio module capable of analog
operation in 12.5 KHz (narrowband), 25 KHz (wideband) or 20 KHz (NPSPAC) channels. A
fi rmware upgrade may be purchased to allow P25 digital operation. The UT-4E UHF 700
/ 800 / 900 MHz transmitter operates in one of two frequency bands: 768 to 869 MHz or
896 to 960 MHz. A modular design allows each of the transmitter’s internal modules to be
individually assembled and tested. This facilitates construction, tuning and maintenance as
well as troubleshooting procedures. The transmitter can be programmed with up to 2 banks

MADE IN CANADA

MODEL # CODE

of 16 channels each.

Specifi cations

Frequency Bands 768 - 869 MHz / 896 - 960 MHz
Channel Spacing 12.5 and 25 KHz (20 KHz NPSPAC; 850 only)
Frequency Switching Range Full Band; ± 0.5 MHz for VSWR alarm
RF Output Power 0.5 to 3.0 Watts adjustable
Duty Cycle 100% (-30°C to +60°C)
Undesired Emissions (Conducted Spurious) ≤ -80 dBc (-45 dBm @ 3.0 Watts) 850
≤ -65 dBc (-30 dBm @ 3.0 Watts) 900
Undesired Emissions ≤ -50 dBc; Narrowband Analog / ≤ -60 dBc; Wideband Analog
(Adjacent Channel Power Ratio) ≤ -67 dBc; Digital
Intermodulation Attenuation ≥ 40 dB
FM Hum & Noise Ratio ≥ 34 dB; NB ; ≥ 40 dB; WB ; ≥ 35 dB; NPSPAC (850)
≥ 31 dB; NB ; ≥ 37 dB; WB ; ≥ 35 dB; NPSPAC (900)
Carrier Frequency Stability ± 0.1 ppm (-30°C to +60°C)
Emission Designators Analog: 11K0F3E (Narrowband); 16K0F3E (Wideband)
Analog: 14K0F3E (20 KHz NPSPAC 850 only)
Paging: 9K20F1D (Narrowband); 16K0F1D (Wideband)
P25 Digital: 8K10F1E (Digital Voice); 8K10F1D (Digital Data)
Audio Distortion (60% of maximum deviation) ≤ 3.0% (-30°C to +60°C)
VSWR Protection ≤ 20:1 VSWR (All Phase Angles)
Operating Temperature -30°C to +60°C
Standby Current ≤ 115 mA / ≤ 145 mA with encryption module
Transmit Current (3.0 W) ≤ 1.80 A

Models Available

UT-4E850-00-300 12.5 / 25 KHz Bandwidth, 0.5 - 3.0 W, 768 - 869 MHz
UT-4E900-00-300 12.5 / 25 KHz Bandwidth, 0.5 - 3.0 W, 896 - 960 MHz

Transmitter Operating Frequency

The transmitter is initially aligned at the factory for the frequency shown on the label on the front panel. For a small
frequency change, no re-alignment of the transmitter may be required. If the frequency change is greater than

±0.5 MHz from the frequency at which the last complete transmitter alignment was performed, the VSWR alarm
/ overload (if used) will need to be realigned. To align and / or adjust the transmitter the outer cover needs to be

removed, the transmitter needs to be plugged into the subrack via a cable and / or extender card and power must
be applied to the system. A 50  dummy load should be connected to the RF output when transmitting.

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TECHNICAL NOTES

MT-4 Radio Systems

TN387 UT-4E UHF 700 / 800 / 900 MHz MT-4E Transmitter

The UT-4E UHF 700 / 800 / 900 MHz transmitter is primarily software controlled, allowing tuning, programming and
maintenance to be done via software service with few hardware adjustments required.

VSWR Alarm / Overload Adjustment:

The VSWR alarm / overload only requires adjustment if the VSWR Alarm is being used. When the VSWR alarm /
overload circuit is properly set, the Amplifi er is protected from excessive antenna VSWR by reducing the amplifi er’s
gain when an overload condition occurs. If the VSWR alarm is not set, the amplifi er is still protected by a current
limiter circuit. The circuit limits Amplifi er current draw to 2.0 Amps and protects the Amplifi er from damage.

To set the VSWR alarm / overload circuit properly, the RF power level must be set to the desired RF power output
fi rst. After the RF power level is properly set, rotate the VSWR alarm adjust potentiometer (RV3) fully counter
clockwise. Terminate the transmitter with a 3:1 mismatch load and connect a voltmeter to Pin 5 of connector J1 in
the transmitter. Slowly adjust the VSWR alarm adjust potentiometer (RV3) clockwise until Pin 5 reads +2.5 Vdc, or
a noticeable drop (10% of total current or more) in current on the +13.8 Vdc line occurs.

RSS Service Mode:

The RSS has the ability to put a transmitter into Service Mode, where the Reference Oscillator may be aligned,
Audio Levels, Subtone Deviation Levels and RF Power Levels may be set, Jumper Settings may be selected, and
Test Patterns can be generated. To put the transmitter into Service Mode, it must be connected to a PC running
the Radio Service Software (RSS) using a type A to 5 pin mini-type B USB cable. From the RSS Transmitter
Confi guration window, click on the Service button. When any required Service functions have been completed, the
radio can be taken out of Service Mode by clicking on the Quit button in the Service window.

NOTE: Do not remove power to the radio or swap radios during servicing.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN441 AMP-4 VHF and UHF 30 Watt Power Amplifi ers

VSWR

POWER AMPLIFIER

FREQUENCY (MHz)

PWR CTRL

TX

G/F

RF OUTPUT

RF INPUT

The AMP-4 30 Watt power amplifi er operates in one of three frequency bands: 136
to 174 MHz, 380 to 430 MHz or 450 to 520 MHz. The power amplifi er is rated for
continuous duty at an adjustable RF output power of 20 to 30 Watts. The output
power is adjusted either using the front panel potentiometer (local mode) or by a
voltage via the rear panel connector (remote mode). The local and remote mode
output power control is determined by a hardware jumper on the inside of the power
amplifi er. The AMP-4 was designed to mate with any of the MT-3 / MT-4 transmitter

MADE IN CANADA

MODEL # CODE

exciter modules.. The input to the power amplifi er cannot exceed 8.0 Watts.

Specifi cations

Frequency Band 136 - 174 MHz / 380 - 430 MHz / 450 - 520 MHz
RF Output Power 20 to 30 Watts adjustable
RF Input Power Range (from exciter) 6.4 to 8.0 Watts (VHF) / 6.0 to 8.0 Watts (UHF)
Duty Cycle 100% (-30°C to +60°C)
Undesired Emissions: Conducted Spurious ≤ -70 dBc
(Includes Harmonics)
Undesired Emissions: Radiated Spurious ≤ -13 dBm (≤ 57.8 dBc)
Intermodulation Attenuation ≥ 40 dB
Thermal Thermal interlock disables @ +80°C (± 5°C) / +176°F
Resets at +70°C (± 7°C) / +158°F
Fan Fan activates @ +60°C (± 5°C) / +140°F
Resets @ +40°C / +104°F
VSWR Protection ≤ 20:1 VSWR (All Phase Angles)
Operating Temperature -30°C to +60°C
Output Impedance 50 
Standby Current Drain ≤ 5 mA
Transmit Current Drain ≤ 7.00 A

Models Available

AMP-4-150-30-00 FM, 20 - 30 Watts continuous duty, 136 - 174 MHz
AMP-4-410-30-00 FM, 20 - 30 Watts continuous duty, 380 - 430 MHz
AMP-4-470-30-00 FM, 20 - 30 Watts continuous duty, 450 - 520 MHz

Guide Rails in Subrack for Power Amplifi er:

The AMP-4 is installed in the subrack (taking up a transmitter and receiver slot) and is mated with a transmitter
exciter. Additional guide rails are required to be mounted in the subrack to support the AMP-4 properly. The
amplifi er can be mounted in slot “A” or slot “B” in the subrack. A guide strip at the top of the subrack will help to
place the guide rails in the proper position by following the numbers on the guide strip. Only the top portion of the
subrack is labeled. Guide rails must be added or removed in the same position on the bottom as on the top.

Remove any guide rails that were used to hold the AMP-2 amplifi er. These guide rails will be located at number
20/21 for slot “A” and number 48/49 for slot “B”. Install guide rails at number 11/12 and 34/35 for slot “A” and number
39/40 and 62/63 for slot “B”.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN441 AMP-4 VHF and UHF 30 Watt Power Amplifi ers

Power Amplifi er Alignment:

Before aligning the 30 Watt Power Amplifi er, the Transmitter Exciter should be tuned properly following the alignment
procedures in the Technical Notes or Instruction Manual for the transmitter. Disable the output power alarm,
VSWR alarm, and VSWR overload by turning the adjustment pots fully counter clockwise (if applicable, depending
on use and model). Set the RF output power at 6.4 Watts. Do not exceed 8.0 Watts at any time into the power
amplifi er.

Connect the transmitter exciter RF output to the power amplifi er input using the 37 cm cable supplied with the power
amplifi er. Connect the Wattmeter to the power amplifi er output and key the exciter by fl ipping the switch on the front
panel to KEY TX.

If jumper J1 on the amplifi er is set for Local Mode (default), adjust the front panel
PWR CTRL (Power Control) pot to obtain the desired RF output power on the
wattmeter.

If jumper J1 is set for Remote Mode, set the voltage on Pin Z22, on the rear
connector of the power amplifi er, to obtain the desired RF output power on the
wattmeter. Pin Z22 can be accessed on an auxiliary panel on the back of the
subrack. The Remote Power Control Voltage range is 0 to 9.5 Vdc.

132

Remote

Power Control

or

132

Local

Power Amplifi er LEDs and Alarms:

The AMP-4 has a heavy duty and a thermally switched cooling fan. The power amplifi er has three LEDs on the front
panel and three open connector alarm outputs at the rear connector.

The green TX LED illuminates when the power amplifi er is transmitting greater than 20 Watts. When the output
power is less than 20 Watts, the “Low TX Output” open collector alarm on Pin B26 will activate.

The red G/F (General Fault) LED is a combination of two alarms: the heatsink temperature and the supply voltage.

The G/F LED will illuminate in standby mode when the heatsink temperature exceeds 80°C (176°F) and will reset
when the temperature falls below 70°C (158°F).

The G/F LED will illuminate in active mode (transmit) when the supply voltage exceeds +17.8 Vdc and will reset
when the supply voltage is reduced to +17.3 Vdc.

When the G/F LED illuminates, the “General Fault” open collector alarm on Pin B24 will activate, and the power
amplifi er turns off the voltage regulator to the RF and main control circuits to enter a low power mode

The red VSWR LED illuminates when the power amplifi er has a VSWR of 2.1:1 to 4.0:1. When the VSWR LED
illuminates, the “VSWR” open collector alarm on Pin Z26 will activate.

Note: For complete alignment procedures, refer to the instruction manual. These notes are for reference only.

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MT-3/4 Radio Systems

TN490 19” Rack Mount High Power Amplifi ers

TECHNICAL NOTES

DC ON
LOW OUTPUT
HIGH VSWR
HIGH TEMP

FRONT VIEW

RF OUT

REAR VIEW

ALARMGND

SH/D CTRL

FAN+ GND

+13.8 VDC

RF IN

GND

The 19” rack mount high power amplifi ers are available in VHF, UHF and 700 / 800 MHz frequency bands. The
power amplifi ers are rated for continuous duty at an RF output power of 60 - 110, 80 or 100 Watts and is designed
to fi t in 7” (4 RU) of rack space.

Specifi cations

Frequency Bands 136 - 144 MHz / 144 - 152 MHz (VHF)
152 - 162 MHz / 162 - 174 MHz (VHF)
406 - 450 MHz / 450 - 512 MHz (UHF)
768 - 869 MHz (700 / 800 MHz)
RF Output Power (factory set) 60 - 110 Watts (VHF)
100 Watts (UHF)
80 Watts (700 / 800 MHz)
RF Input Power Range (from exciter) 5.0 to 10.0 Watts (VHF and UHF)

2.0 to 5.0 Watts (700 / 800 MHz)

Spurious & Harmonics ≤ -63 dBc @ 60 Watts RF output (VHF)
≤ -65 dBc @ 110 Watts RF output (VHF)
≤ -70 dBc @ 100 Watts RF output (UHF)
≤ -70 dBc @ 80 Watts RF output (700 / 800 MHz)
Duty Cycle 100% (-30°C to +60°C)
Load VSWR Tolerance VSWR Protected above 2.5:1
Output Impedance 50 
Tx Current Drain @ 60 W (VHF) 17 A (typical) / 22 A (maximum)
Tx Current Drain @ 110 W (VHF) 22 A (typical) / 25 A (maximum)
Tx Current Drain @ 100 W (UHF) 21 A (typical) / 25 A (maximum)
Tx Current Drain @ 80 W (700 / 800 MHz) 20 A (typical) / 24 A (maximum)
Weight 10 lbs

Depth 19.0 inches
Vertical Rack Space 7.0 inches (4 RU)
Horizontal Mounting 3.4 inches

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MT-3/4 Radio Systems

TN490 19” Rack Mount High Power Amplifi ers

VHF Rear Panel Mount

The VHF power amplifi er is available in both a 19”
rack mount package and a rear panel mount that
attaches to the back of the Codan subrack. The
rear panel mount cannot be used with an A-PNL­AUX96-3 Auxiliary Connector or the rear panel
mount AC to DC or DC to DC Power Supplies.
The rear panel mount amplifi er does not come
with the LED indicators but does maintain the
ALARM, CTRL and SH/D pins.

TECHNICAL NOTES

Models Available

AMP-140-110-D1P Rear Panel Mount, 60 - 110 Watts continuous duty, 136 - 144 MHz
AMP-140-110-D1R Rack Mount, 60 - 110 Watts continuous duty, 136 - 144 MHz
AMP-148-110-D1P Rear Panel Mount, 60 - 110 Watts continuous duty, 144 - 152 MHz
AMP-148-110-D1R Rack Mount, 60 - 110 Watts continuous duty, 144 - 152 MHz
AMP-157-110-D1P Rear Panel Mount, 60 - 110 Watts continuous duty, 152 - 162 MHz
AMP-157-110-D1R Rack Mount, 60 - 110 Watts continuous duty, 152 - 162 MHz
AMP-168-110-D1P Rear Panel Mount, 60 - 110 Watts continuous duty, 162 - 174 MHz
AMP-168-110-D1R Rack Mount, 60 - 110 Watts continuous duty, 162 - 174 MHz
AMP-428-100-D1R Rack Mount, 100 Watts continuous duty, 406 - 450 MHz
AMP-481-100-D1R Rack Mount, 100 Watts continuous duty, 450 - 512 MHz
AMP-817-080-D1R Rack Mount, 80 Watts continuous duty, 768 - 869 MHz

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN490 19” Rack Mount High Power Amplifi ers

Power Amplifi er Operation

The 19” rack mount high power amplifer has a heavy duty heatsink and an RF switched cooling fan. The power
amplifi er has four standard LEDs (not available on the VHF rear panel mount), and a summary alarm pin.

The LEDs operate as follows:

Label Color Description
DC ON Green Activates when DC power is connected.
LOW OUTPUT Red Activates when the output power drops to 80-85% of output power.
HIGH VSWR Red Activates when VSWR exceeds 2.5:1.
HIGH TEMP Red Activates when the amplifi er exceeds safe operating temperature.

The three pins on the rear of the amplifi er operate as follows:

Pin Description
ALARM A summary alarm that activates (< 1 Vdc) when any of three alarm conditions activate
(Low Output, High VSWR or High Temp).
CTRL When this pin is pulled to ground, the output power is reduced by 1 to 1.5 dB.
SH/D When this pin is pulled to ground through a 0 to 50 K Ohm resistor,
the output power is reduced by up to 4 dB.

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MT-3/4 Radio Systems

TN490 19” Rack Mount High Power Amplifi ers

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TECHNICAL NOTES

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN491 Modular 5-Pack Series High Power Amplifi ers

FRONT VIEW REAR VIEW

DC ON LOW OUTPUT HIGH VSWR HIGH TEMP

RF POWER AMPLIFIER

RF IN

ALARM

+13.8 VDC

GND

RF OUT

The modular 5-pack series high power amplifi ers are available in VHF, UHF and 700 / 800 MHz frequency bands.
The power amplifi ers are rated for continuous duty at an RF output power of 80 or 100 Watts. Designed to be fully
modular and space effi cient, the 5-pack series allows for 5 amplifi ers in 4 RU of rack space using a 19” subrack.

Specifi cations

Frequency Bands 136 - 144 MHz / 144 - 152 MHz (VHF)
152 - 162 MHz / 162 - 174 MHz (VHF)
406 - 450 MHz / 450 - 512 MHz (UHF)
764 - 870 MHz (700 / 800 MHz)
RF Output Power (factory set) 100 Watts (VHF and UHF)
80 Watts (700 / 800 MHz)
RF Input Power Range (from exciter) 5.0 to 10.0 Watts (VHF and UHF)

2.0 to 5.0 Watts (700 / 800 MHz)

Spurious & Harmonics ≤ -65 dBc @ 100 Watts RF output (VHF)
≤ -70 dBc @ 100 Watts RF output (UHF)
≤ -70 dBc @ 80 Watts RF output (700 / 800 MHz)
Duty Cycle 100% (-30°C to +60°C)
Load VSWR Tolerance VSWR Protected above 2.5:1
Output Impedance 50 
Tx Current Drain @ 100 W (VHF) 18 A (typical) / 23 A (maximum)
Tx Current Drain @ 100 W (UHF) 21 A (typical) / 25 A (maximum)
Tx Current Drain @ 80 W (700 / 800 MHz) 20 A (typical) / 24 A (maximum)
Weight 10 lbs

Depth 19.0 inches
Vertical Rack Space 7.0 inches (4 RU)
Horizontal Mounting 3.4 inches

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN491 Modular 5-Pack Series High Power Amplifi ers

Models Available

A-RACK19-AMP-02 19” Subrack for 5-Pack Series Amplifi ers, holds up to 5 amps

AMP-140-100-D1M 5 Pack Series, 100 Watts continuous duty, 136 - 144 MHz
AMP-148-100-D1M 5 Pack Series, 100 Watts continuous duty, 144 - 152 MHz
AMP-157-100-D1M 5 Pack Series, 100 Watts continuous duty, 152 - 162 MHz
AMP-168-100-D1M 5 Pack Series, 100 Watts continuous duty, 162 - 174 MHz
AMP-428-100-D1M 5 Pack Series, 100 Watts continuous duty, 406 - 450 MHz
AMP-481-100-D1M 5 Pack Series, 100 Watts continuous duty, 450 - 512 MHz
AMP-817-080-D1M 5 Pack Series, 100 Watts continuous duty, 768 - 869 MHz

Power Amplifi er Operation

The Modular 5-pack Series high power amplifer has a heavy duty heatsink and an RF switched cooling fan. The
power amplifi er has four standard LEDs, and a summary alarm pin.

The LEDs operate as follows:

Label Color Description
DC ON Green Activates when DC power is connected.
LOW OUTPUT Red Activates when the output power drops to 80-85% of output power.
HIGH VSWR Red Activates when VSWR exceeds 2.5:1.
HIGH TEMP Red Activates when the amplifi er exceeds safe operating temperature.

The ALARM pin on the rear of the amplifi er operates as follows:

Pin Description
ALARM A summary alarm that activates (< 1 Vdc)when any of three alarm conditions activate
(Low Output, High VSWR or High Temp).

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN500 SR-39-1 Subrack

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 Type 84 motherboard makes extensive use of cage
jacks to interconnect the A and B systems supporting a number of fi eld confi gurations. Additional auxiliary control
connectors provide easy access to virtually all control and audio lines, simplifying many standard base / repeater
confi gurations. Modules may be inserted in the subrack in many various confi gurations as shown in Figure 1. The
Control 1 connector is used for the base or repeater control card or paging modulator. The Optional Control 2 card
is for custom systems requiring specialized paging / data / audio interconnections and is not normally used. If the
radio system is ordered with antenna relays, the system regulator with the relays is housed in a larger module that
encompasses the area for the Control 2 module. The subrack has room for two transmitter and receiver pairs. The
left side connectors are reserved for transmitter and receiver A (C in second subrack) respectively, while the right
side connectors are reserved for transmitter and receiver B (D in second subrack). Although any transmitter and
receiver can be placed in either of the respective slots, convention usually follows that the lower frequency radios
will go in slots A and the higher in slots B to D.

CONTROL

1

TRANSMITTER

A

RECEIVER

A

TRANSMITTER

B

RECEIVER

B

SYSTEM

REGULATOR

OPTIONAL
CONTROL

2

Figure 1: Standard Subrack

A quadruple system is shown in Figure 2 with A and B pairs in the fi rst rack, and C and D pairs in the second rack.
This system requires a multiple link controller and two system regulators.

MULTIPLE LINK CONTROLLER

BLANK
PANE L

BLANK
PANE L

TRANSMITTER

A

TRANSMITTER

C

RECEIVER

A

RECEIVER

C

TRANSMITTER

B

TRANSMITTER

D

RECEIVER

B

RECEIVER

D

SYSTEM

REGULATOR

SYSTEM

REGULATOR

BLANK
PANE L

BLANK
PANE L

Figure 2: Dual Subracks for Multiple Link Confi guration

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN500 SR-39-1 Subrack

If a VHF or UHF power amplifi er is installed, only one transmitter and receiver pair can be installed since the power
amplifi er takes up two slots, as shown in Figure 3.

CONTROL

1

TRANSMITTER

A

RECEIVER

A

POWER AMPLIFIER

A

SYSTEM

REGULATOR

OPTIONAL
CONTROL

2

Figure 3: Subrack with Power Amplifi er

If two transceivers are used with power amplifi ers, the power amplifi ers are normally installed in a second subrack
as shown in Figure 4. This keeps all of the audio and control signal routing to a single subrack, simplifying the
system. A second system regulator and the mulitiple link controller are not required for this confi guration.

CONTROL

1

BLANK
PAN EL

TRANSMITTER

A

POWER AMPLIFIER

A

RECEIVER

A

TRANSMITTER

B

POWER AMPLIFIER

B

RECEIVER

B

SYSTEM

REGULATOR

BLANK
PAN EL

OPTIONAL
CONTROL

2

BLANK
PAN EL

Figure 4: Dual Subracks with Two Power Amplifi ers

The 96 pin auxiliary control connector, located on the back of the motherboard (facing rear of the subrack), has 96
pins and provides access to virtually all signal and power lines on the motherboard. Many repeater confi gurations
can be implemented by interconnecting some of these lines through a mating 96 pin connector. Additionally,
external equipment can also be connected to the repeater through the auxiliary control connector, allowing for more
extensive radio control (i.e., DC remotes, tone remotes etc.). Note: The + and - DC lines from the auxiliary control
connector are not fused. Use caution with these lines so that interconnect cables are not overloaded.

DB25 Connector to CI-RC-4M-G2

Connector J12 is a female DB25 connector which can be used for connecting audio, channel select and control
signal lines to a CI-RC-4M-G2 (second generation) multiple link controller. When connecting to a CI-RC-4M-G2, a
standard straight-through male-to-male DB25 cable can be used.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN500 SR-39-1 Subrack

Power Input

The main power input (+10 to +17 Vdc; +13.8 Vdc nominal) connector is located at the back of the subrack, on
the motherboard. There is an identical +9.5 Vdc power output connector on the motherboard that is used to
power other Codan equipment at +9.5 Vdc (the CI-RC-4M-G2 controller, for example).

NOTE: Do not connect the main power input to the +9.5 Vdc power output connector, as a transient suppressor

(over voltage protection) will short to ground to protect the equipment.

Reverse voltage protection and over voltage protection (transient suppressor) is provided at the main power input
as well as the +9.5 Vdc line. The main power input is protected with a standard fast-blow 15 amp fuse. These
components may require replacing if the power supply is not connected properly, or even after a power surge or
a lightning strike. The two transient suppressors have diff erent voltage ratings for the main power input and +9.5
Vdc lines. Figure 5 shows the subrack / motherboard rear view.

Antenna Relay Activation

The motherboard on the subrack contains a set of jumpers that are used to activate the optional antenna relays in
the System Regulator module from the Transmitter PTT IN and PTT OUT signal lines.

JU36 TXA PTT OUT activates Relay A JU37 TXA PTT IN activates Relay A
JU39 TXA PTT OUT activates Relay B JU40 TXA PTT IN activates Relay B
JU42 TXB PTT OUT activates Relay A JU43 TXB PTT IN activates Relay A
JU45 TXB PTT OUT activates Relay B JU46 TXB 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 TXA PTT OUT mutes RXA JU41 TXA PTT OUT mutes RXB
JU44 TXB PTT OUT mutes RXA JU47 TXB PTT OUT mutes RXB

DB25 Connector to DSP-223 and IP-223 / IP-224

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 = RX A Bal O/P2 or B = AUX 1 AUD O/P2 JU107 A = RX A Bal O/P1 or B = AUX AUD O/P1
JU105 A = TX A Bal I/P2 or B = AUX 1 AUD I/P2 JU108 A = DSP-223 / +13.8 V or B = IP-223 & IP-224 / RX A COR
JU106 A = TX A Bal I/P1 or B = AUX 1 AUD I/P1 JU109 TX A SEC / CLR I/P (installed to enable TX A SEC / CLR I/P)

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN500 SR-39-1 Subrack

Channel and Bank Select

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).

JU48 TX A Channel select lines +9.5 V pullup enable JU49 RX A Channel select lines +9.5 V pullup enable
JU50 TX A CSEL 0 JU51 TX A CSEL 1
JU52 TX A CSEL 2 JU53 TX A CSEL 3
JU54 TX A Bank select A = Bank A, B = Bank B JU55 RX A CSEL 0
JU56 RX A CSEL 1 JU57 RX A CSEL 2
JU58 RX A CSEL 3 JU59 RX A Bank select A = Bank A, B = Bank B
JU60 TX B Channel select lines +9.5 V pullup enable JU61 RX B Channel select lines +9.5 V pullup enable
JU62 TX B CSEL 0 JU63 TX B CSEL 1
JU64 TX B CSEL 2 JU65 TX B CSEL 3
JU66 TX B Bank select A = Bank A, B = Bank B JU67 RX B CSEL 0
JU68 RX B CSEL 1 JU69 RX B CSEL 2
JU70 RX B CSEL 3 JU71 RX B Bank select A = Bank A, B = Bank B

POWER INPUT

+10 to +17 Vdc

+13.8 Vdc NOMINAL

CONNECTOR

FOR CI-RC-4M-G2

(5604-5GAGC150)

DB25

Figure 5: Rear View of Subrack

+13.8 Vdc LINE

TRANSIENT SUPPRESSOR

(2007-1N637800) &

REVERSE VOLTAGE DIODE

(2001-MR751000)

15 AMP FAST

BLOW FUSE

BANK AND CHANNEL

SELECT & PULL-UP

+9.5 Vdc REGULATED

(NOT TYPICALLY USED)

B SIDE

JUMPERS

TRANSIENT SUPPRESSOR

REVERSE VOLTAGE DIODE

POWER INPUT /

OUTPUT

ANTENNA RELAY

& RX MUTE

ACTIVATION

JUMPERS

+9.5 Vdc LINE

(2007-1N637500) &

(2001-MR751000)

A SIDE

BANK AND CHANNEL

SELECT AND PULL-UP

JUMPERS

DB25

JUMPERS

DB25

CONNECTOR

FOR CI-DSP-223

AND CI-IP-223

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN520 SR-39-3 Multiple Receiver Subrack

The SR-39-3 subrack is designed to hold and interconnect the MT-3 and MT-4 series of receivers on one universal
motherboard. The SR-39-3 subrack holds up to fi ve receiver modules and one system regulator (the system
regulator will require jumpers JU15 to JU24 installed for multiple receiver subrack compatibility) as shown in Figure 1.

The multiple receiver subrack is ideal for voting receivers or with the mutliple transmitter subrack for multi-channel
trunking systems.

RECEIVER

A

RECEIVER

B

RECEIVER

C

RECEIVER

D

RECEIVER

E

SYSTEM

REGULATOR

Figure 1: Multiple Receiver Subrack

The multiple receiver subrack does not interconnect the diff erent receivers but brings control lines and audio out to
connection points on the rear of the subrack. The external control connectors allow access to the following signals
on each receiver:

Pin No. Name Function
1 RX CSEL 3 Receiver channel select line No. 3
2 RX CSEL 2 Receiver channel select line No. 2
3 RX CSEL 1 Receiver channel select line No. 1
4 RX CSEL 0 Receiver channel select line No. 0
5 RX COR RLY COM1 Receiver Carrier Operated Relay Common 1
6 RX RLY NC1/NO1 Receiver Relay Normally Open / Normally Closed
7 RX COR Receiver Carrier Operated Relay output
8 RX DISC/FL/DE Receiver Disc or Flat or De-emphasis audio output (MT-3)
Receiver Disc or SM-3 Speaker audio output (MT-4E)
9 RX SQL OVER Receiver squelch override input
10 RX SYN LOCK DET (Spare) Receiver Spare I/O
11 RX PRIORITY COR Receiver Priority COR output (MT-3)
Receiver A/D Mode (MT-4E)
12 RX RSSI Receiver Signal Strength Indicator
13 RX BAL O/P 2 Receiver balanced audio output, side 2
14 RX BAL O/P 1 Receiver balanced audio output, side 1
15 RX MUTE Receiver mute input
16 GND Circuit common

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TN520 SR-39-3 Multiple Receiver Subrack

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TECHNICAL NOTES

MT-3/4 Radio Systems

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN600 AC-3E Audio Control Card

The AC-3E audio control card is a plug-in module which provides audio routing, PTT routing, and muting control for
MT-3 and MT-4 radio systems. The audio control card includes the following features:

• jumper selectable audio routing, PTT, and muting.

• two independently adjustable hang timers adjustable from 50 milliseconds to 10 seconds.

• sockets for optional CTCSS decoders and encoders.

• low power analog and CMOS control circuitry.

• maximum standby current of 30 mA.

• true balanced 600  inputs and outputs for external equipment connection.

• optically isolated inputs and outputs for control by external equipment.

• suitable for Type 2 E&M signalling.

USB

CNTL
BUS

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

TRANSMITTER

REFERENCE

INPUT

FREQUENCY (MHz)

FREQUENCY (MHz)

TX

NORM
OFF
KEY TX

MIC

MADE IN CANADA

MODEL # CODE

RF OUT

RECEIVER

FREQUENCY (MHz)

REFERENCE

INPUT

MADE IN CANADA

MODEL # CODE

SQ. DI SAB LE

NORMO

FF

RF NI

SYSTEM REGULATOR

FUNCTION

12

11

10

9

8

VOL

ON
OFF

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

67

+

METER

-

1

2

3

4

5

POWER

ON

OFF

RX A

RX B

AUDIO

CONTROL

TX A

TX B

13

TX A

TX B

13

PULL DOWN
TO REMOVE

TRANSMITTER

FREQUENCY (MHz)

AD

REF

IN

57

MICMODE

57

CNTL

5

BUS

9

5

9

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

NORM
OFF
KEY TX
ANALOG
DIGITAL

The AC-3E audio control card is fully confi gurable and can be used for all repeater and base station applications.
The audio control card module circuitry consists of three main functional blocks:

AUDIO

RX A

RX B

CONTROL

TX A

TX B

13

TX A

TX B

13

PULL DOWN
TO REMOVE

9

9

(1) The repeater control circuit, which allows all COR / PTT routing combinations for all repeaters.

57

(2) Optional CTCSS modules that can be installed at the factory or in the fi eld.

57

(3) Audio routing circuitry for active level control and distribution of receiver to transmitter audio

5

signals. The AC-3E is designed for applications where interface to external equipment is required.

5

All audio and control inputs/outputs are isolated by transformers and opto-isolators on the AC-3E.

External Audio Input: 600 , -25 dBm to 0 dBm adjustable
External Audio Output: 600 , -20 dBm to +3 dBm adjustable
Internal Audio Input: 4.7 K, -25 dBm to +3 dBm adjustable

The AC-3E audio control card includes four potentiometers on the front panel for adjusting internal audio levels.
Optional frequency select rotary switches can also be mounted on the front panel of the audio control cards, giving
easy access to 16 pre-programmed receiver and transmitter operating frequencies. Two switches are mounted on
the front of the audio control cards that can be confi gured to control CTCSS on / off or repeat disable. Confi guration
of all switches on the audio control card is set up at the factory at the time of order.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN600 AC-3E Audio Control Card

Although the Audio Control Card can be confi gured to work in various confi gurations with add-in options and
functionality, the three main functions of the AC-3E Audio Control Card are shown in Figures 1, 2 and 3:

PTTA

CORA -> PTTA

CORA

RXA
COR

RXB
COR

INHIBIT

CORB

INHIBIT

JUMPER

CORA -> PTTB

JUMPER

CORB -> PTTA

JUMPER

CORB -> PTTB

JUMPER

HANG
TIMER

A

HANG
TIMER

B

AUXILIARY CONNECTIONS

Figure 1: Repeater Control Figure 2: CTCSS Control

INHIBIT

REPEATER

INTER

CONNECTIONS

PTTB

INHIBIT

ISOLATORS

OPTO

TXA
PTT

TXB
PTT

AUX1
COR

AUX2
COR

AUX1
PTT

AUX2
PTT

RXA
DISCRIMINATOR
O/P

RXA
BALANCED
O/P

RXB
DISCRIMINATOR
O/P

RXB
BALANCED
O/P

Jumper

Selection

Jumper

Selection

CTCSS

DECODER

CTCSS

DECODER

Jumper

Selection

Jumper

Selection

OPTIONAL

CTCSS

ENCODER

TO AUDIO ROUTING

OPTIONAL

CTCSS

ENCODER

TO AUDIO ROUTING

TXA
SUBTONE
I/P

RXA
MUTE

TXB
SUBTONE
I/P

RXB
MUTE

RXA BALANCED O/P
FROM CTCSS CONTROL

RXB BALANCED O/P
FROM CTCSS CONTROL

RECEIVER A

DISTRIBUTION
AMPLIFIER

RECEIVER B

DISTRIBUTION
AMPLIFIER

AUDIO

GATES

AUDIO
LEVEL

CONTROLS

R5

R9

R13

R48

R52

R56

AUDIO

GATE

AUDIO

GATE

CONTROL

LINE
DRIVER
AMPLIFIERS

CONTROL

LINE
DRIVER
AMPLIFIERS

AUDIO
LEVEL

R120

TXA AUDIO

TXB AUDIO

AUXILIARY AUDIO

AUDIO
LEVEL

R123

AUXILIARY AUDIO

C19

AUX1 BALANCED
I/P

C20

TXA BALANCED
I/P

TXB BALANCED
I/P

B11

AUX1 BALANCED
O/P

A11

B14

AUX2 BALANCED
I/P

A14

C1

AUX2 BALANCED
O/P

C3

Figure 3: Audio Routing

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MT-3/4 Radio Systems

TN640 CI-PM-3 Paging Modulator

The Paging Modulator is a plug-in module which provides digital and/or analog paging capability, such as base
station paging, remote paging or simulcast paging, for MT-3 and MT-4 radio systems. The CI-PM-3 is confi gured
via the front panel switches and internal jumper settings.

The CI-PM-3 paging modulator supports both analog and digital paging formats, and can transmit POCSAG and
other 2-level modulation schemes at transfer rates of 512, 1200 and 2400 baud. It can also be confi gured for use
as a data repeater, whereby 2-level paging data is recovered, re-shaped and then re-transmitted to an additional
repeater/paging transmitter.

The CI-PM-3 supports 4-level modulation formats at data transfer rates up to 6400 bps. Each of the four modulation
deviation levels can be independently set, making the CI-PM-3 suitable for use in such pager signaling schemes as
Motorola’s FLEX™ paging protocol.

USB

CNTL
BUS

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

SYSTEM REGULATOR

FUNCTION

12

11

10

9

8

VOL

ON
OFF

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

67

+

METER

-

1

2

3

4

5

POWER

ON

OFF

MODULATOR

DATA
MODE

A D

DATA

EXT

FREQ

REF

INT

NORM

MODE

SETUP

2 LEVEL

SET
MOD

4 LEVEL

SET

DEV

PAGI NG

REF IN

REF OUT

DATA / CTRL

PORT

PULL DOWN
TO REMOVE

REF

MICMODE

CNTL
BUS

AD

IN

USB

TRANSMITTER

FREQUENCY (MHz)

MODEL # CODE

NORM
OFF
KEY TX
ANALOG
DIGITAL

MIC RF OUT

MADE IN CANADA

The CI-PM-3 uses an on-board frequency reference source consisting of a 10 MHz OCXO, with a frequency
stability of ± 0.35 ppm from -30°C to +60°C. For high stability applications (such as Simulcast), the CI-PM-3 paging
modulator may be confi gured to use an external high stability reference source (i.e., rubidium, GPS or WWV) with a
standard stability greater than or equal to 0.002 ppm, to discipline the on-board phase-locked loop OCXO oscillator.

PAGING

MODULATOR

The CI-PM-3 Paging Modulator includes the following standard features:

DATA

REF IN

MODE

FREQ

REF

MODE

SET
MOD

SET

DEV

A D

DATA

NORM

SETUP

2 LEVEL

4 LEVEL

REF OUT

EXT

DATA / CTRL

PORT

INT

PULL DOWN
TO REMOVE

• low power analog and CMOS control circuitry (current draw of less than 250 mA).

• extended operating temperature range.

• jumper selectable repeater/paging transmitter confi guration.

• on-board 10 MHz OCXO.

• front panel selection of PLL OCXO using external high stability frequency reference.

• jumper and line selectable analog/digital paging confi guration.

• connection for optional CTCSS encoder/decoder.

• balanced 600 / single-ended microphone input.

• selectable digital delay for simulcast operation.

FLEX™ is a trademark of Motorola, Inc.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN640 CI-PM-3 Paging Modulator

Installation:

Figure 1 shows a generic connection between the Codan subrack with A-PNL-AUX96-3 auxiliary connector to the
Zetron Model 66 for analog and/or digital 2 level paging.

P1 (A-PNL-AUX96-3 CONTROL CONNECTOR)

CODAN RADIO EQUIPMENT

(GPIO 15) BAL AUDIO I/P1

(GPIO 13) BAL AUDIO I/P2

(GPIO 9) PTT I/P

(GPIO 2) CTCSS HU/BUSY CTCSS CONTROL

(GPIO 16) 2-LVL DATA DIG DATA

(GPIO 10) A/D MODE SEL DIG MODE

13.8V

PURC TONES FROM
MODEL 2200, ETC.

Figure 1: CI-PM-3 Connection Diagram

ZETRON MODEL 66

TRANSMITTER CONTROLLER

(J3-15)

CD15

(J3-13)

CD11

(J3-9)

CD6

(J3-2)

CD20

(J3-16)

CD17

(J3-10)

CD7

(J4-2)

GND GND

GND

AZ32

B2

B32

(J4-5)

(J4-1)

1

TO TX LO

2

TO TX HI

4

ANA PTT N/O

7

15

10

11

DIG PTT N/O

3

1

+12 VDC

2

GND

6

GND

4

LINK LO

5

LINK HI

Jumpers Required on Model 66:
Pins 5, 8 and 12 to GND
JP2 = B

TRANSMITTER

LINK

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TECHNICAL NOTES

MT-4 Radio Systems

TN650 CI-RC-4L Repeater Control Card

The CI-RC-4L repeater control card is a plug-in module which provides LVDS Serial Data routing, COR-PTT routing,
and receiver priority settings for an MT-4 repeater radio system. The repeater control card includes the following
features:

• jumper selectable LVDS Serial Data and COR-PTT routing (repeater confi guration).

• receiver priority setting jumpers for certain confi gurations (where required).

• jumpers for disabling LVDS Serial Data and COR-PTT routing on simplex links.

• optional CTCSS interface board for 1 of 10 CTCSS tone decode selection (used for custom systems only).

The MT-4 receiver and transmitter modules all plug into the CI-RC-4L repeater controller via cables that plug in to
the RJ45 jacks on the front panel of all the modules. The CI-RC-4L comes with four diff erent cable lengths to plug
into the four repeater receiver and repeater transmitter modules. If the system only uses two of the cables, the other
cables can be kept for future system expansion or as spare cables.

REPEATER

CONTROL

SWITCH A SWITCH B

15

3

15

13

11

11

7

9

PULL DOWN
TO REMOVE

USB

CNTL
BUS

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

REF

IN

MICMODE

CNTL
BUS

TRANSMITTER

FREQUENCY (MHz)

AD

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

NORM
OFF
KEY TX
ANALOG
DIGITAL

TRANSMITTER

FREQUENCY (MHz)

AD

REF

3

IN

5

7

9

MICMODE

TX A

RX A

CNTL
BUS

TX B

RX B

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

NORM
OFF
KEY TX
ANALOG
DIGITAL

USB

CNTL
BUS

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

SYSTEM REGULATOR

FUNCTION

12

11

10

9

8

VOL

ON
OFF

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

67

+

METER

-

1

2

3

4

5

POWER

ON

OFF

Optional frequency select rotary switches can also be mounted on the front panel of the repeater control card, giving
easy access to 16 pre-programmed receiver and transmitter operating frequencies. The CI-RC-4L has no external
audio or serial data and is used only for controlling repeater confi gurations. The repeater control card module
circuitry consists of three main jumper functions:

REPEATER
CONTROL

SWITCH A SWITCH B

15

3

15

13

11

11

7

9

PULL DOWN
TO REMOVE

TX A

RX A

TX B

RX B

(1) Repeater Confi guration jumpers used to determine which receiver keys and routes data to which
transmitter.

3

5

7

9

(2) Receiver priority settings used to set receiver priority for certain repeater confi gurations.

(3) Additional jumpers for the CTCSS interface board and other miscellaneous functions.

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TECHNICAL NOTES

MT-4 Radio Systems

TN650 CI-RC-4L Repeater Control Card

Repeater Confi guration Jumpers

Repeater Confi guration Keying JU1 JU2 JU3

Repeater in A side of subrack RXA -> TXA Out Out Out

Repeater in B side of subrack RXB -> TXB In Out Out

Two independant repeaters RXA -> TXA Out In Out
in each side of subrack RXB -> TXB

* Drop-Link on A side RXA -> TXA In In Out
(Repeater A side with Link B side) RXA -> TXB
Set RXA priority for Simplex Links RXB -> TXA

* Drop-Link on B side RXA -> TXB Out Out In
(Repeater B side with Link A side) RXB -> TXA
Set RXB priority for Simplex Links RXB -> TXB

Crossband System (No Simplex) RXA -> TXB In Out In
RXB -> TXA

Crossband System with Simplex RXA -> TXB In In In
frequencies on A or B side RXB -> TXA
(First receiver has priority always)

* Drop-Repeating Link RXA -> TXA Out In In
(Repeater in A or B side with RXA -> TXB
repeating link in A or B side) RXB -> TXA
RXB -> TXB

Receiver Priority Jumper Settings

These jumpers are only used for the Drop-Link confi gurations noted with an * above. For Drop-Links with Simplex
links, set the receiver priority to the local repeater receiver.

Receiver Priority JU9 JU10 JU11

First receiver active has priority Out Out Out

RXA priority In Out Out

RXB priority Out In Out

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TECHNICAL NOTES

MT-4 Radio Systems

TN652 CI-RC-4M-G2 Multiple Link Controller

The CI-RC-4M-G2 Multiple Link Controller provides control capability for up to four receiver / transmitter pairs in an
MT-4E repeater radio system. The CI-RC-4M-G2 controller provides the following features:

• interconnection (LVDS Serial Data routing, COR-PTT routing, Audio routing) of up to four receiver and four

transmitter modules in any confi guration (repeater, repeater with links, crossband systems, etc.).

• four-way analog audio bridge allowing analog to digital and digital to analog conversions with up to four pairs of

radios (with adjustable audio levels).

• multiple CTCSS tones and NAC codes may be selected to operate each connection between receivers and

transmitters (up to seven CTCSS/NAC for each link).

• DTMF control of receiver to transmitter links.

• setting of receiver priorities.

• transmitter channel switching based on received CTCSS or NAC.

• auxiliary E&M connection.

• acknowledge tones for each transmitter on DTMF disable / enable.

• custom jumperable Repeat Disable line for controlling analog bridging (links) and E&M connections.

• current draw of 8 mA to 72 mA dependant on system confi guration (17 mA to 27 mA without audio bridging).

• 2 independent general purpose outputs that can be controlled by NAC, CTCSS or DTMF

(open collector 750 mA / 30 Vdc max).

The MT-4E receiver and transmitter modules all plug into the CI-RC-4M-G2 repeater controller via cables that plug
into the RJ45 jacks on the front panel of all the modules. The CI-RC-4M-G2 comes with eight diff erent cable lengths
to plug into the eight receiver and transmitter modules. If the system only uses some of the cables, the other cables
can be kept for future system expansion or as spare cables. The CI-RC-4M-G2 is 19” rack mountable in 1 RU of
rack space.

RX & TX INTERCONNECT PORTS

TXA RXA TXB RXB TXC RXC TXD RXD

TRANSMITTER

FREQUENCY (MHz)

AD

REF

IN

NORM
OFF
KEY TX

USB

REF

IN

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

TRANSMITTER

FREQUENCY (MHz)

AD

MIC RF OUT

MADE IN CANADA

MODEL # CODE

ANALOG
DIGITAL

NORM
OFF
KEY TX
ANALOG
DIGITAL

MICMODE

CNTL
BUS

MICMODE

CNTL
BUS

RECEIVER

FREQUENCY (MHz)

AD

USB

CNTL
BUS

MADE IN CANADA

MODEL # CODE

RECEIVER

FREQUENCY (MHz)

AD

USB

CNTL
BUS

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

USB

REF

MICMODE

CNTL
BUS

REF

MICMODE

CNTL
BUS

AD

IN

USB

AD

IN

USB

TRANSMITTER

FREQUENCY (MHz)

TRANSMITTER

FREQUENCY (MHz)

NORM
OFF
KEY TX
ANALOG
DIGITAL

MIC RF OUT

MADE IN CANADA

MODEL # CODE

NORM
OFF
KEY TX
ANALOG
DIGITAL

MIC RF OUT

MADE IN CANADA

MODEL # CODE

MULTIPLE LINK CONTROLLER - G2

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

CNTL
BUS

MADE IN CANADA

MODEL # CODE

RECEIVER

FREQUENCY (MHz)

AD

SQ. DISABLE

NORM
OFF

REF
IN

USB

CNTL
BUS

MADE IN CANADA

MODEL # CODE

SYSTEM REGULATOR

FUNCTION

1

12

2

11

3

10

4

9

5

8

67

POWER

+

VOL

ON
OFF

RF NI

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

SYSTEM REGULATOR

FUNCTION

12

11

10

9

8

VOL

ON
OFF

RF NI

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

ON

METER

OFF

-

1

2

3

4

5

67

POWER

+

ON

METER

OFF

-

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TECHNICAL NOTES

MT-4 Radio Systems

TN652 CI-RC-4M-G2 Multiple Link Controller

Installation:

In addition to the RJ45 interconnect cables on the front panel, the +9.5 Vdc power and ground must be connected
on the back panel. Figure 1 shows a diagram of the back panel of the CI-RC-4M-G2.

CI-RC-4M-G2

AUX-E&M CONNECTIONS

12345678

SUBRACK-1 A & B SUBRACK-2 C & D

9.5VDC INPUT

-

+

ABCD

12345678

12345678

12345678

12345678

12345678

12345678

12345678

12345678

RX

TX

Figure 1:CI-RC-4M-G2 Back Panel

A female DB25 connector on the back of the subrack (J12) can be used for connectioning to the CI-RC-4M-G2
using a standard straight-through male-to-male DB25 cable. The A-PNL-AUX96-3 auxiliary connector can also be
used to connect to the CI-RC-4M-G2, as shown in Figure 2. The information in brackets is the function that uses
that particular connection. For example, if you are using CTCSS tones, the Rx Disc O/P must be connected. The
diagram only shows connections for Receiver and Transmitter A.

CODAN RADIO EQUIPMENT

+9.5 Vdc

GND GND

RXA Disc O/P

RXA BAL O/P1

RXA BAL O/P 2

TXA CSEL D0

TXA CSEL D1

TXA CSEL D2

TXA CSEL D3

BANK A/B

GND

TXA BAL I/P 1

TXA BAL I/P 2

TXA PTT TXA PTT (E&M)

RXA Mute

J9 +

J9 -

B10 (J1-8)

B24 (J1-5)

A24 (J1-6)

C21 (J2-1)

B21 (J2-2)

A21 (J2-3)

C23 (J2-4)

B9 (J6-1)

A32 (J4-1)

C18 (J1-1)

B18 (J1-2)

BB6 (J1-3)

CI-RC-4M-G2 MULTIPLE

LINK CONTROLLER

+9.5 Vdc

RXA Disc O/P (CTCSS)

RXA Bal Audio 1 (DTMF and E&M)

TXA CSEL0 (Channel Selection)

TXA CSEL1 (Channel Selection)

TXA CSEL2 (Channel Selection)

TXA CSEL3 (Channel Selection)

TXA BANK A/B (BankSelection)

TXA Bal Audio 1 (E&M)

ACK PTT (Ack Tone)

RXA Mute (Simplex Operating Mode)

A, B, C and D

Back Panel Pin-Out

AUX - E&M CONNECTIONS

12345678

Aux PTT K

Aux PTT A

Aux Bal Out 2

Aux COR C

Aux Bal In 2

Aux Bal In 1

Aux Bal Out 1

Aux COR E

TX Bank A/B

COR Input

Rpt_Dis (A only)

Ground

RX Disc Out

RX Bal Audio 1

12345678

12345678

TX Csel 3

TX Csel 2

TX Csel 1

Aux PTT Out

TX Csel 0

TX Bal Audio 1

TX PTT

Ack PTT

RX Mute

GP O/P

RX

TX

E&M CONNECTIONS

Figure 2: CI-RC-4M-G2 Connection Diagram

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Page 2 of 10

Aux Bal Out 1

Aux Bal Out 2

Aux Bal In 1

Aux Bal In 2

Aux COR E

Aux COR C

Aux PTT A

Aux PTT K

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TECHNICAL NOTES

MT-4 Radio Systems

TN652 CI-RC-4M-G2 Multiple Link Controller

Multiple Link Controller Programming:

The CI-RC-4M-G2 multiple link controller is software programmable using the MLCS (Multiple Link Controller
Software). The MLCS allows fl exible programming options for the radio system. A type A to 5 pin mini-type B USB
cable is used to connect the USB port of the computer to the USB port on the front panel of the controller. The
System Settings and Receiver / Transmitter Links windows are shown in Figure 3.

Figure 3: Sysytem Settings and Receiver / Transmitter Links

The Receiver / Transmitter Links window allows for a wide variety of complex repeater confi gurations using a link
confi guration grid. The grid uses color coding to indicate diff erent connection settings.

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TECHNICAL NOTES

MT-4 Radio Systems

TN652 CI-RC-4M-G2 Multiple Link Controller

Each link on the grid can be programmed separately for a diff erent confi guration. Three diff erent link confi gurations
are shown in Figure 4: COR Controlled Link, DTMF Controlled Link and a Conditional Link (with both CTCSS and
NAC conditions, as well as Channel Selection capability).

Figure 4: Link Confi gurations

Figure 5 shows the CTCSS selection window (CTCSS tones need to selected globally for the CI-RC-4M-G2),
Channel Selection window and General Purpose Output window.

Figure 5: CTCSS Tones, Channel Select and General Purpose Outputs

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TECHNICAL NOTES

MT-4 Radio Systems

TN652 CI-RC-4M-G2 Multiple Link Controller

Analog Audio Bridging Circuit:

The CI-RC-4M-G2 controller is equipped with a 4 way analog audio bridge. This audio bridge allows the user to
interconnect RF modules using an analog audio interface similar to the AC-3E and BC-4E products. It allows the
user to interconnect up to four RF modules modules as well as an auxiliary audio input and output.

On the multi-link controller there is an audio adjustment pot for each audio path available. The block diagram on the
next page (see Figure 6) shows the audio routing and audio pot adjustments.

To enable a specifi c audio path, the appropriate audio jumper must be removed. For the specifi c audio jumper
required for enabling the appropriate audio path, refer to the jumper table below:

JU53 RXA to TXA Audio Disable JU63 RXC to TXA Audio Disable
JU59 RXA to TXB Audio Disable JU70 RXC to TXB Audio Disable
JU54 RXA to TXC Audio Disable JU64 RXC to TXC Audio Disable
JU58 RXA to TXD Audio Disable JU68 RXC to TXD Audio Disable
JU52 RXB to TXA Audio Disable JU65 RXD to TXA Audio Disable
JU57 RXB to TXB Audio Disable JU71 RXD to TXB Audio Disable
JU51 RXB to TXC Audio Disable JU66 RXD to TXC Audio Disable
JU56 RXB to TXD Audio Disable JU69 RXD to TXD Audio Disable
JU55 RXA to Aux Audio O/P Disable
JU50 RXB to Aux Audio O/P Disable
JU62 RXC to Aux Audio O/P Disable
JU67 RXD to Aux Audio O/P Disable

To enable COR-PTT routing of the signal, the following jumpers must be installed:

JU23A COR A to PTT A Enable JU25A COR A to PTT C Enable
JU23B COR B to PTT A Enable JU25B COR B to PTT C Enable
JU23C COR C to PTT A Enable JU25C COR C to PTT C Enable
JU23D COR D to PTT A Enable JU25D COR D to PTT C Enable
JU24A COR A to PTT B Enable JU26A COR A to PTT D Enable
JU24B COR B to PTT B Enable JU26B COR B to PTT D Enable
JU24C COR C to PTT B Enable JU26C COR C to PTT D Enable
JU24D COR D to PTT B Enable JU26D COR D to PTT D Enable

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TN652 CI-RC-4M-G2 Multiple Link Controller

A

TECHNICAL NOTES

MT-4 Radio Systems

LEVEL

AUDIO

GATE

AUDIO

CONTROL

AUX AUDIO I/P

RV13

LEVEL

AUDIO

CONTROLS

TXA AUDIO I/P

TXA AUDIO

RV8

TXB AUDIO I/P

TXB AUDIO

RV12

TXC AUDIO I/P

TXC AUDIO

RV7

TXD AUDIO I/P

TXD AUDIO

RV11

AUX AUDIO O/P

AUXILIARY AUDIO

LINE

DRIVER

AMPLIFIERS

SUMMING

AMPLIFIERS

RV6

FROM RXD
FROM RXC
FROM RXB

TO TXA

RV19

TO TXA

TO TXB

RV23

RECEIVER D

TO TXB

RV18

TO TXC

RXD

AUDIO

RV22

RV17

O/P

TO TXC

TO TXD

RV16

RV21

TO TXD

TO AUX

RV20

RV15

TO AUX

RV14

AUDIO

GATES

DISTRIBUTION

AMPLIFIER

RECEIVER A

RXA AUDIO O/P

Figure 6: Audio Routing and Audio Pot adjustments

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TO TXA

RV5

TO TXB

RV10

RECEIVER B

RECEIVER C

RXC

AUDIO

O/P

TO AUX

TO TXD

TO TXC

RV3

RV9

RV4

UDIO

O/P

RXB

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TN652 CI-RC-4M-G2 Multiple Link Controller

and other UHF stations.

TX A

RX A

ANTENNA A

21543

-

+

SYSTEM REGULATOR

67

FUNCTION

8

9

ON

VOL METER

11

10

12

MULTIPLE LINK CONTROLLER - G2

NORM

SQ. DISABLE

OFF

REF

IN

RECEIVER

FREQUENCY (MHz)

AD

USB

ANALOG

DIGITAL

NORM

OFF

KEY TX

FREQUENCY (MHz)

TRANSMITTER

AD

USB

IN

REF

USB

RX & TX INTERCONNECT PORTS

VHF TXA = TBD MHz / Selectable CTCSS

VHF RXA = TBDMHz / CTCSS TBD Hz

VHF TXB = TBD MHz / CTCSS TBD Hz

VHF RXB = TBD MHz / CTCSS TBD Hz

TXA RXA TXB RXB TXC RXC TXD RXD

RECEIVER

TRANSMITTER

CNTL

BUS

MICMODE

NORM

SQ. DISABLE

OFF

REF

IN

FREQUENCY (MHz)

AD

USB

ANALOG

DIGITAL

NORM

OFF

KEY TX

FREQUENCY (MHz)

AD

USB

IN

REF

CNTL

BUS

MICMODE

MADE IN CANADA

EXT

SPKR

OFF

INT

EXT

SPKR

RF NI

MADE IN CANADA

MODEL # CODE

CNTL

BUS

MADE IN CANADA

MIC RF OUT

MODEL # CODE

RF NI

CNTL

BUS

MIC RF OUT

MADE IN CANADA

MADE IN CANADA

MODEL # CODE

POWER AMPLIFIER

MODEL # CODE

RF INPUT

RF OUTPUT

MADE IN CANADA

FREQUENCY (MHz)

PWR CTRL

MODEL # CODE

UHF TXC = TBD MHz / CTCSS TBD Hz

TX

G/F

VSWR

UHF RXC = TBD MHz / CSQ

to the UHF Base Station Receiver

The UHF Transmitter (TXB) Transmits

the received VHF and UHF signals back

ANALOG LINK

TECHNICAL NOTES

MT-4 Radio Systems

TX A

RX A

ANTENNA A

21543

SYSTEM REGULATOR

FUNCTION

11

10

12

RF OUTPUT

REMOTE ADAPTER

TELEX DSP-223 TONE

DSP-223

FUNCTION

HANDSET

TELEX

FREQUENCY (MHz)

POWER AMPLIFIER

PWR CTRL

PROGRAMMING PORT

RECEIVER

FREQUENCY (MHz)

AD

POWER PTT MONITOR

PTT IC

CTCSS

RADIO RX

RADIO TX

FREQUENCY (MHz)

TRANSMITTER

ANALOG AUDIO INTERFACE

AD

IN

REF

LINE RX

LINE TX

RADIO RX

RADIO TX +

LINE TX +

LINE RX

TCSS
C

RADIO TX -

LINE TX -

ROUND
G

8

9

TX

SQ. DISABLE

NORM

OFF

KEY TX

MADE IN CANADA

-

+

67

EXT

SPKR

ON

OFF

INT

EXT

VOL METER

SPKR

RF INPUT

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

G/F

VSWR

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

CNTL

BUS

USB

ANALOG

DIGITAL

MADE IN CANADA

MIC RF OUT

MODEL # CODE

USB

CNTL

BUS

MICMODE

UHF TX = TBD MHz / Selectable CTCSS

UHF RX = TBD MHz / CTCSS TBD Hz

TXA Mutes RXA + Add Simplex Unmute Delay (250ms) to TX

and changes the channel of the

The UHF Receiver (RXB) Receives

one of multiple different CTCSS tones

repeaters all on the same receive

channel with the same CTCSS tone.

This VHF transmitter goes out to different

VHF Transmitter (TXA) to a corresponding

The UHF Receiver (RXB) also keys up the

frequency, but with different CTCSS tones.

UHF Transmitter (TXB) to repeat the signal.

TXA mutes RXA with Simplex Unmute Delay.

The Multiple Link Controller is

Figure 7: Example Multiple Link Controller System with analog links

ANALOG LINK

The DSP-223 keys up the UHF Base

programmed to change

VHF Transmitter (TXA) channels

based on CTCSS.

different CTCSS tones to the

UHF Receiver at the High Site.

The UHF Transmitter will transmit

Station Transmitter in Analog Mode.

(LEASED TELEPHONE LINES)

ANALOG 2 OR 4 WIRE AUDIO AND TONES

CONSOLE

ANALOG TONE REMOTE

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TN652 CI-RC-4M-G2 Multiple Link Controller

has High Priority.

ON

RX A RX B

ANTENNA A ANTENNA B

21543

-

+

SYSTEM REGULATOR

67

FUNCTION

8

9

VOL METER

11

10

12

MULTIPLE LINK CONTROLLER - G2

NORM

SQ. DISABLE

OFF

REF

IN

RECEIVER

FREQUENCY (MHz)

AD

ANALOG

DIGITAL

NORM

OFF

KEY TX

FREQUENCY (MHz)

TRANSMITTER

AD

USB

IN

REF

USB

MICMODE

NORM

SQ. DISABLE

OFF

REF

IN

RECEIVER

FREQUENCY (MHz)

AD

ANALOG

DIGITAL

NORM

OFF

KEY TX

FREQUENCY (MHz)

TRANSMITTER

AD

USB

IN

RX & TX INTERCONNECT PORTS

REF

MICMODE

TXA RXA TXB RXB TXC RXC TXD RXD

VHF TXA Ch. 1 = 168.650 MHz / CTCSS 110.9 Hz = Flight Following

VHF TXA Ch. 2 = 168.625 MHz / CTCSS 110.9 Hz = Air Guard

VHF TXA Ch. 3 = 168.750 MHz / CTCSS TBD = Air Detect

TX A TX B

MADE IN CANADA

EXT

SPKR

ON

OFF

INT

EXT

SPKR

RF NI

CNTL

BUS

USB

MIC RF OUT

CNTL

BUS

RF NI

CNTL

BUS

USB

MIC RF OUT

CNTL

BUS

MADE IN CANADA

MADE IN CANADA

MADE IN CANADA

MADE IN CANADA

MODEL # CODE

POWER AMPLIFIER

MODEL # CODE

MODEL # CODE

POWER AMPLIFIER

MODEL # CODE

RF INPUT

RF OUTPUT

FREQUENCY (MHz)

PWR CTRL

TX

G/F

VSWR

RF INPUT

RF OUTPUT

FREQUENCY (MHz)

PWR CTRL

TX

G/F

VSWR

OFF

POWER

21543

-

+

METER

67

FUNCTION

SYSTEM REGULATOR

9

11

10

12

SQ. DISABLE

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

MADE IN CANADA

EXT

SPKR

8

ON

OFF

INT

EXT

VOL

SPKR

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

CNTL

BUS

USB

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

CNTL

BUS

USB

UHF Base Station Receiver.

The Air Guard Receiver (RXC)

the received VHF signals back to the

The UHF Transmitter (TXB) Transmits

ANALOG LINK

TECHNICAL NOTES

MT-4 Radio Systems

TX A

RX A

ANTENNA A

21543

SYSTEM REGULATOR

FUNCTION

9

11

10

12

IP REMOTE ADAPTER

TELEX IP-223 OR IP-224

TX

LNK

IP-223

LINE

SQ. DISABLE

RECEIVER

FREQUENCY (MHz)

AD

TELEX

IC

HANDSET

RX
X
T

TX­TX+

GND

X
R

TX
X­T
TX+

NORM

OFF

FREQUENCY (MHz)

TRANSMITTER

AD

IN

REF

BNK

ANALOG AUDIO INTERFACE

A

5

RX A

P25 BASE

CONTROL

RADIO 1 RADIO 2

13

MADE IN CANADA

-

+

67

EXT

SPKR

8

ON

OFF

INT

EXT

VOL METER

SPKR

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

USB

CNTL

BUS

ANALOG

DIGITAL

KEY TX

MADE IN CANADA

MIC RF OUT

MODEL # CODE

USB

CNTL

BUS

MICMODE

BNK

B

A

B

Local

Enable

Disable

TO REMOVE

PULL DOWN

5

TX A

Clear

Secure

9

9

Key

TX A TX B

Zeroize

13

Air Guard (RXC),

or Air Detect (RXD)

on Flight Following (RXA),

Three VHF Receivers receive

and Transmit the Received signal

LVDS serial data for the NAC detect and

also through the audio routing circuitry in

The UHF Receiver (RXB) needs to connected via

audio input of the VHF Transmitter (TXA).

signal and outputs audio that is routed to the

order to allow the P25 Digital to Analog conversion.

The UHF Receiver (RXB) de-vocodes the P25 Digital

INTERFACE

COMMON AIR

one of three separate NACs

Flight Following or Air Detect.

and changes the channel of the

The UHF Receiver (RXB) Receives

on the UHF Transmitter (TXB).

VHF Transmitter (TXA) to Air Guard,

P25 DIGITAL LINK

at the High Site.

Transmitter in Digital Mode.

The UHF Transmitter can transmit

three different NACs to the UHF Receiver

The IP-223 keys up the UHF Base Station

LAN / WAN

The Multiple Link Controller can be

programmed to change channels

based on CTCSS (for an analog link)

or NAC (for a digital link).

TELEX PROPRIETARY DIGITAL IP INTERFACE

CONSOLE

TELEX IP BASED

Figure 8: Example Multiple Link Controller System with P25 Digital uplink

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TN652 CI-RC-4M-G2 Multiple Link Controller

ON

TX A TX B

RX A RX B

ANTENNA A ANTENNA B

21543

SYSTEM REGULATOR

FUNCTION

9

11

10

12

MULTIPLE LINK CONTROLLER - G2

SQ. DISABLE

RECEIVER

FREQUENCY (MHz)

AD

NORM

OFF

FREQUENCY (MHz)

TRANSMITTER

AD

IN

REF

USB

SQ. DISABLE

RECEIVER

FREQUENCY (MHz)

AD

NORM

OFF

FREQUENCY (MHz)

TRANSMITTER

AD

IN

RX & TX INTERCONNECT PORTS

REF

TXA RXA TXB RXB TXC RXC TXD RXD

VHF TXA = 163.150 MHz / Selectable CTCSS

VHF RXA = 163.150 MHz / CSQ

VHF TXB = 169.775 MHz / CTCSS 103.5 Hz

VHF RXB = 169.775 MHz / CTCSS 103.5 Hz

MADE IN CANADA

-

+

67

EXT

SPKR

8

ON

OFF

INT

EXT

VOL METER

SPKR

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

CNTL

BUS

USB

ANALOG

DIGITAL

KEY TX

MADE IN CANADA

MIC RF OUT

MODEL # CODE

USB

CNTL

BUS

MICMODE

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

CNTL

BUS

USB

ANALOG

DIGITAL

KEY TX

MADE IN CANADA

MIC RF OUT

MODEL # CODE

USB

CNTL

BUS

MICMODE

RF OUTPUT

FREQUENCY (MHz)

POWER AMPLIFIER

RF OUTPUT

FREQUENCY (MHz)

POWER AMPLIFIER

OFF

POWER

21543

FUNCTION

SYSTEM REGULATOR

11

12

RF INPUT

RF OUTPUT

MADE IN CANADA

MODEL # CODE

FREQUENCY (MHz)

PWR CTRL

TX

PWR CTRL

TX

POWER AMPLIFIER

G/F

VSWR

RF INPUT

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

FREQUENCY (MHz)

TRANSMITTER

G/F

VSWR

AD

REF

DANIELS

-

ELECTRONICS LTD.

+

METER

67

MADE IN CANADA

EXT

SPKR

8

9

ON

OFF

INT

EXT

VOL

10

SPKR

RF INPUT

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

PWR CTRL

SQ. DISABLE

NORM

OFF

IN

MODEL # CODE

TX

G/F

VSWR

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

CNTL

BUS

USB

ANALOG

DIGITAL

KEY TX

MADE IN CANADA

MIC RF OUT

MODEL # CODE

UHF TXC = 408.475 MHz / CTCSS 103.5 Hz

USB

CNTL

BUS

MICMODE

UHF RXC = 417.475 MHz / CSQ

and other UHF stations.

to the UHF Base Station Receiver

The UHF Transmitter (TXC) Transmits

the received VHF and UHF signals back

ANALOG LINK

TECHNICAL NOTES

MT-4 Radio Systems

TX A

RX A

ANTENNA A

21543

SYSTEM REGULATOR

FUNCTION

9

11

10

12

RF OUTPUT

REMOTE ADAPTER

TELEX DSP-223 TONE

DSP-223

FUNCTION

HANDSET

TELEX

FREQUENCY (MHz)

POWER AMPLIFIER

PWR CTRL

PROGRAMMING PORT

SQ. DISABLE

RECEIVER

FREQUENCY (MHz)

AD

POWER PTT MONITOR

PTT IC

NORM

ANALOG AUDIO INTERFACE

FREQUENCY (MHz)

TRANSMITTER

OFF

AD

IN

REF

CTCSS

RADIO RX

RADIO TX

LINE RX

LINE TX

RADIO RX

RADIO TX +

LINE TX +

LINE RX

TCSS
C

RADIO TX -

LINE TX -

ROUND
G

MADE IN CANADA

-

+

67

EXT

SPKR

8

ON

OFF

INT

EXT

VOL METER

SPKR

RF INPUT

DANIELS

ELECTRONICS LTD.

MADE IN CANADA

MODEL # CODE

TX

G/F

VSWR

RF NI

NORM

OFF

REF

IN

MADE IN CANADA

MODEL # CODE

USB

CNTL

BUS

ANALOG

DIGITAL

KEY TX

MADE IN CANADA

MIC RF OUT

MODEL # CODE

USB

CNTL

BUS

MICMODE

UHF TX = 417.475 MHz / Selectable CTCSS

UHF RX = 408.475 MHz / CTCSS 103.5 Hz

TXA Mutes RXA + Add Simplex Unmute Delay (250ms) to TX

The UHF Receiver (RXC) Receives

one of seven separate CTCSS tones

tone 8 (103.5 Hz) to act as a local repeater.

it will also key up VHF Transmitter (TXB) on CTCSS

(TXC) and when it receives CTCSS tone 7 (151.4 Hz)

The VHF Receiver (RXA) keys up the UHF Transmitter

TXB mutes RXB with Simplex Unmute Delay.

TXA mutes RXA and RXB both with Simplex Unmute Delay.

The VHF Receiver (RXB) keys up the UHF Transmitter (TXC).

and changes the channel of the

channel with the same CTCSS tone.

CTCSS tone 8 (103.5 Hz) will key up

VHF Transmitter (TXA) to a corresponding

The UHF Receiver (RXC) also keys up the

UHF Transmitter (TXC) to repeat the signal.

VHF Transmitter (TXB) on the same CTCSS tone.

Kinport

Garns

Big Butte

Taylor

F1 = 1950 Hz

F2 = 1850 Hz

F3 = 1750 Hz

F4 = 1650 Hz

ANALOG LINK

Sedgewick

Kelly

Malad

Direct

F5 = 1550 Hz

F6 = 1450 Hz

F7 = 1350 Hz

F8 = 1250 Hz

Transmitter in Analog Mode.

eight different CTCSS tones to

The UHF Transmitter will transmit

the UHF Receiver at the High Site.

The DSP-223 keys up the UHF Base Station

(LEASED TELEPHONE LINES)

ANALOG 2 OR 4 WIRE AUDIO AND TONES

based on CTCSS.

The Multiple Link Controller is

programmed to change channels

CONSOLE

ANALOG TONE REMOTE

Figure 9: Example Multiple Link Controller System with co-located repeater

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TECHNICAL NOTES

MT-4 Radio Systems

TN652 CI-RC-4M-G2 Multiple Link Controller

Multiple Link Controller Conditional Linking and Channel Change Programming:

The Multiple Link Controller can be confi gured to operate as a Conditional Link. If the Conditional Link is selected
the path from Rx to Tx will only be active if the received signal contains one of the programmed CTCSS tones or
NACs. Up to 7 CTCSS tones or NACs may be programmed into a Conditional Link.

The Multiple Link Controller can also be programmed to allow for Channel Selection of the transmitter, based on
the received CTCSS tone or NAC. To activate the Channel Selection for a link, the link needs to be programmed
as follows:

• Open the Rx / Tx Link confi guration window for the link required.

• Select the Conditional Link check box.

• Select the Enable Channel Selection check box.

• CTCSS tones / NACs are not required to be programmed into the Rx / Tx Link confi guration window. Programming

CTCSS tones / NACs in the Rx/ TX Link confi guration window limits Channel Selection to ONLY these 1 to 7 codes.
Leaving these selections as “none” will pass ALL CTCSS tones / NACs to the Channel Selection tab.

• A grey dot with the C (for Channel Selection enabled) will show on the grid (the dot will be blue if CTCSS tones /

NACs were programmed into the Conditional Link).

• The CTCSS tones / NACs used to change the channels should be programmed in the Channel Selection tab.

Note that the Multiple Link Controller will ONLY allow up to 15 Channels changed based on CTCSS tones, as it
can only allow up to 15 CTCSS tones programmed globally for the entire controller. An unlimited number of NACs
can be used for Channel Selection as the NACs are not required to be programmed globally

Figure 10: Example Programming for Channel Selection with CTCSS tones / NACs

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN655 CI-BC-4E Base Control Card

The CI-BC-4E base control card is a plug-in module which provides audio routing, COR and PTT routing and front
panel control for an MT-4 base station radio system. The base control card includes the following features:

• jumper selectable audio routing, PTT, and muting.

• low power analog and CMOS control circuitry.

• true balanced 600  inputs and outputs for external equipment connection.

• optically isolated inputs and outputs for control by external equipment.

• front panel control of channel and bank select for receiver and transmitter.

• front panel selection of clear / secure (encrypted) operation and clear keys operation.

• front panel selection of local or remote control of base station functions.

• suitable for Type 2 E&M signalling.

The MT-4 receiver and transmitter modules all connect to the CI-BC-4E base control card via the back panel
motherboard. There is no front panel RJ45 connection between the MT-4 receivers, transmitters and base control
card.

USB

CNTL
BUS

RECEIVER

FREQUENCY (MHz)

AD

MADE IN CANADA

MODEL # CODE

SQ. DISABLE

NORM
OFF

REF
IN

RF NI

FUNCTION

12

11

10

9

8

VOL METER

ON
OFF

SPKR

INT
EXT

EXT

SPKR

SYSTEM REGULATOR

ANTENNA A

1

2

3

4

5

RX A

67

+

-

TX A

MADE IN CANADA

13

13

TX A TX B

Zeroize

Key

P25 BASE
CONTROL

RX A

5

9

TX A

5

9

Secure

Clear

Local

Enable

Disable

PULL DOWN

TO REMOVE

TRANSMITTER

FREQUENCY (MHz)

AD

REF

A

IN

BNK

B

MICMODE

A

BNK

B

CNTL
BUS

USB

MIC RF OUT

MADE IN CANADA

MODEL # CODE

NORM
OFF
KEY TX
ANALOG
DIGITAL

The CI-BC-4E base control card module circuitry consists of three main functional blocks:

P25 BASE
CONTROL

13

9

13

9

TX A TX B

Zeroize

Key

Secure

Clear

RX A

5

TX A

5

A

B

A

B

Local

Enable

Disable

PULL DOWN
TO REMOVE

(1) The repeater control circuit allows all the common COR / PTT routing combinations for dual

BNK

base-repeater systems.

(2) Front panel interface allows for user control of transmitter and receiver functions, including

BNK

encryption operation.

(3) Audio routing circuitry is for the active level control and distribution of receiver and transmitter
audio signals. The CI-BC-4E is designed for applications where interface to external equipment is
required. All audio and control inputs/outputs are isolated by transformers and opto-isolators on
the CI-BC-4E.

CI-BC-4E External Audio Input: 600 , -25 dBm to 0 dBm adjustable
CI-BC-4E External Audio Output: 600 , -20 dBm to +3 dBm adjustable
CI-BC-4E Internal Audio Input: 4.7 K, -25 dBm to +3 dBm adjustable

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN655 CI-BC-4E Base Control Card

The three main functions of the CI-BC-4E Base Control Card are shown in Figures 1, 2 and 3:

PTT

CORA -> PTTA

REPEATER

JUMPER

CORA -> PTTB

JUMPER

CORB -> PTTA

JUMPER

CORB -> PTTB

JUMPER

CORA

RXA
COR

RXB
COR

INHIBIT

CORB

INHIBIT

INTERCONNECTIONS

AUXILIARY CONNECTIONS

Figure 1: Repeater Control Figure 2: Front Panel Interface

INHIBIT

OPTO

ISOLATORS

TXA
PTT

TXB
PTT

AUX1
COR

AUX2
COR

AUX1
PTT

AUX2
PTT

FRONT PANEL RX
CHANNEL SELECT
ROTARY SWITCHES

FRONT PANEL TX
CHANNEL SELECT
ROTARY SWITCH

FRONT PANEL
LOCAL ENABLE /
DISABLE SELECT

RXA CSEL0

RXA CSEL1

RXA CSEL2

RXA CSEL3

TXA CSEL0

TXA CSEL1

TXA CSEL2

TXA CSEL3

FRONT PANEL TXA
BANK SELECT SWITCH

FRONT PANEL RXA
BANK SELECT SWITCH

FRONT PANEL TXA
SECURE/CLEAR SWITCH

FRONT PANEL TXB
SECURE/CLEAR SWITCH

FRONT PANEL
ZEROIZE
ENCRYPTION
KEYS BUTTON

ZEROIZE

CONTROLLER

TXA BANK A/B

RXA BANK A/B

TXA SECURE/CLEAR

TXB SECURE/CLEAR

CLEAR KEYS

RXA BALANCED
O/P

RXB BALANCED
O/P

RECEIVER A

DISTRIBUTION
AMPLIFIER

RECEIVER B

DISTRIBUTION
AMPLIFIER

AUDIO
GATES

AUDIO
LEVEL

CONTROLS

R9

R5

R13

R48

R52

R56

AUDIO

GATE

LINE
DRIVER
AMPLIFIERS

AUDIO

GATE

LINE
DRIVER
AMPLIFIERS

AUDIO
LEVEL

CONTROL

R120

TXA AUDIO

TXB AUDIO

AUXILIARY AUDIO

AUDIO
LEVEL

CONTROL

R123

AUXILIARY AUDIO

C19

AUX1 BALANCED
I/P

C20

TXA BALANCED
I/P

TXB BALANCED
I/P

B11

AUX1 BALANCED
O/P

A11

B14

AUX2 BALANCED
I/P

A14

C2

AUX2 BALANCED
O/P

C4

Figure 3: Audio Routing

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TECHNICAL NOTES

MT-4 Radio Systems

TN661 UIC-5 Universal Interface Card

The UIC-5-00 Universal Interface Card (UIC) is a plug-in module which provides an IP-based Ethernet network
connection between MT-4 radio systems and other Land Mobile Radio (LMR) subsystems.

CODAN RADIO SYSTEM WITH UIC

TRANSMITTER

RECEIVER

FREQUENCY (MHz)

FREQUENCY (MHz)

AD

AD

REF

IN

NORM

SQ. DISABLE

OFF
KEY TX

NORM

ANALOG
DIGITAL

OFF

MIC RF OUT

MADE IN CANADA

MODEL # CODE

REF
IN

USB

RF NI

CNTL
BUS

MADE IN CANADA

MODEL # CODE

USB

IP NETWORK

UIC

ETHERNET

MICMODE

TX A

RX A

ZEROIZE

CNTL

KEY

BUS

TX B

RX B

PULL DOWN
TO REMOVE

CONSOLE

The UIC is programmable to support the TIA P25 Digital Fixed Station Interface (DFSI) standard via its network
connection. The UIC can control and monitor radio modules installed in both the A-side (left) and B-side (right) of
the subrack. An additional fi rmware purchase is required for B-side operation. The UIC-5-00 Card is a generational
upgrade from the UIC-4-00, adding DFSI Packet Data as well as a number of signifi cant performance improvements
for running P25 over non-dedicated networks that may be shared with commercial or non-related users

SPKR

FUNCTION

12

11

10

9

8

VOL METER

ON
OFF

INT
EXT

EXT

SPKR

SYSTEM REGULATOR

1

2

3

4

5

67

+

-

MADE IN CANADA

ANTENNA A

RX A

TX A

SUBSCRIBER

TIA P25 DFSI Operation

The UIC supports the DFSI as published in the P25 standard document TIA-102.BAHA-A. The UIC provides a fully
end-to-end digital link between consoles and subscriber units and supports analog-mode calls as well as P25 calls.
The UIC transports digital P25 audio data packets (IMBE™or AMBE+2™) between the console and the transmitter
and receiver radio modules without any conversion to or from baseband audio. The UIC uses Codan LVDS serial
data to transport digital information between the UIC and the receiver and transmitter modules. This preserves a
fully end-to-end digital link, including audio encryption. Analog voice is carried via the DFSI as digitized u-law pulse­code modulation (PCM) audio data.

The UIC-5 supports two diff erent types of interfaces via its network connection:

• TIA Fixed Station Interface, Version 1 (Voice only)

• TIA Fixed Station Interface, Version 2 (Voice and/or Packet Data)

Console Controlled / Software Programmable Features

Some of the UIC functions (eg. call start/end, channel selection, etc.) are dynamically controlled by the console. The
console that is used in a system with the UIC may not implement or provide access to all of the functions. See the
console’s documentation for more information on which UIC features are accessible from the console.

Other UIC functions (eg. IP address programming, interface mode selection, etc.) are controlled by static
programmable confi guration settings. These settings can be viewed and modifi ed using a website GUI (Graphical
User Interface) interface to the UIC.

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TECHNICAL NOTES

MT-4 Radio Systems

TN661 UIC-5 Universal Interface Card

The UIC supports all of the following features:

• Channel and Bank control of receiver and transmitter modules (2 banks of 16 channels each).

• Detect the mode (analog or P25) of an inbound call on the receiver and report to the console.

• Receiver squelch selection (muted or unsquelched) controlled by the console.

• Clear the encryption keys from all encryption-equipped radio modules through the UIC’s front panel Zeroize Key

push button.

• Control and monitoring of 8 digital general purpose input and output (GPIO) signals from the console. The 4 inputs

are 10 mA max., 0 to +1 Vdc low / +2 to +13.8 Vdc high. The 4 outputs are 20 mA max., 0 Vdc low / +5 Vdc high.

• Control and monitoring of 8 analog GPIOs for use with external equipment. The 4 inputs are 0 to +3.3 Vdc, 3 k

impedance. The 4 outputs are 20 mA max., 0 to +3.3 Vdc. Analog I/O resolution is10 bits (3.22 mv / bit = 1 LSB).

• Programmable simplex mode operation.

• Local repeating under the control of the console, or automatically when the UIC is not connected to a console.

• Current draw of 200 mA maximum.

• Audio Reception and Transmission using IMBE™ (P25) or u-law PCM (analog).

• Passes all received P25 LCW and ESW data to the console (NAC, TGID, MFID, ALGID, KID, etc.).

• Full end-to-end digital encryption if supported by the console and subscribers.

• Outbound audio buff ering when transmitting P25 mode calls, with a programmable buff er length.

• supports DFSI v2 P25 Packet Data.

Console Systems

UIC

ETHERNET

The UIC will interface with the following P25 DFSI consoles:

Avtec Scout

TX A

RX A

TX B

ZEROIZE

KEY

Catalyst IP FSI Gateway
InterTalk (Pantel)
Moducom UltraCom IP
Bosch / Telex C-Soft (P25 version)

RX B

PULL DOWN
TO REMOVE

Zetron Acom

Transmitter and Receiver Firmware Requirements

The UIC-5 requires that the MT-4E transmitter be fi rmware version 2.10.1 or later. The UIC-5 will work with any
MT-4E receiver fi rmware.

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TN661 UIC-5 Universal Interface Card

Programming and Networking

Ethernet Port 10/100 Base-T, auto-sensing
Default IP Address 192.168.123.66
Rescue IP Address 172.23.123.2
Default Username and Password p25admin (for both)

Maximum Network Bandwidth Requirement:

• Analog PCM Voice Call 100 Kbps

• Digital P25 Voice Call 70 Kbps

Default A-side UDP Port for Control Connection 50000
Default A-side RTP Port for Voice Conveyance Connection 50020
Default B-side UDP Port for Control Connection 50002
Default B-side RTP Port for Voice Conveyance Connection 50022
Default A-side Packet Data Port 50010
Default B-side Packet Data Port 50012

TECHNICAL NOTES

MT-4 Radio Systems

UIC Web GUI Global Settings

The UIC Web GUI is used to read and to modify various static confi guration settings in the UIC. The Web GUI can
be used to confi gure the UIC Global Settings such as the IP address.

UIC MAC Address

The UIC has a factory-assigned unique Ethernet MAC address that cannot be modifi ed. This unique address is
stored in non-volatile memory and is not aff ected by changes to any of the UIC’s confi guration settings.

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TECHNICAL NOTES

MT-4 Radio Systems

TN661 UIC-5 Universal Interface Card

UIC Web GUI Confi guration Parameters

The UIC Web GUI can also be used to set the indivicual confi guration parameters for each of the radio pairs
connected to the UIC (Side ‘A’ and Side ‘B’).

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TECHNICAL NOTES

MT-4 Radio Systems

TN661 UIC-5 Universal Interface Card

Recommended Network Requirements for P25 DFSI with Codan UIC

Following is a list of recommended network requirements for both the Codan UIC-4 and UIC-5 cards for P25
Digital Fixed Station Interface connection (in both P25 and analog mode).

These recommended values are for the Codan equipment. Other P25 DFSI equipment (consoles / base stations)
may have diff erent network requirements.

Specifi cation Fixed Network 3G / LTE Network Notes

Latency < 20 ms < 250 ms Based on end user acceptable audio delay
Jitter (UIC-5) < 8 ms < 100 ms *See Note below
Jitter (UIC-4) < 4 ms < 15 ms
Packet Loss (UIC-5) < 3% < 6% Better than DAQ 3.4 voice reproduction
Packet Loss (UIC-4) < 0.5% < 1%
Bandwidth 250 kbps or better (full duplex) Minimum 70kbps for P25 voice and/or 100kbps

for Analog

Note: For jitter conditions beyond the stated values (eg. satellite communications), increasing the audio buff er will
account for these situations at the cost of additional voice latency.

The UIC confi guration settings for the buff er are as follows:

UIC Confi guration Setting Default Value Range

Audio Buff er Length (UIC-4) 200 ms 40 - 500 ms
Audio Buff er Length (UIC-5) 200 ms 20 - 10000 ms

The UIC-4 is more sensitive to jitter and packet loss, the maximum specifi cations shown for a 3G / LTE network
may result in less than ideal performance.

IMBE™ is a trademark of Digital Voice Systems, Inc.

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TN661 UIC-5 Universal Interface Card

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TECHNICAL NOTES

MT-4 Radio Systems

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TECHNICAL NOTES

MT-4 Radio Systems

TN670 Stratus Controller

The Stratus Controller is a general-purpose controller for routing digital P25 communications over a Wide Area
Network (WAN) or Local Area Network (LAN). The Stratus Controller will work in digital clear or digital secure mode;
it is fully capable of all operation with encrypted calls. The Stratus Controller will also route analog communications,
but only in a full broadcast mode (ie. Analog signal received at one site will automatically be transmitted at all
sites). FSI (version 2) will support more analog routing (CTCSS and DCS) and will be incorporated into the Stratus
Controller in the future.

The Stratus Controller uses the TIA-102 (P25) standard Digital Fixed Station Interface (DFSI) to link to FSI capable
devices such as the Codan Universal Interface Card (UIC). The Stratus Controller can support both Fixed Station
radios using the UIC, or emulate Fixed Station Radios allowing DFSI capable consoles to connect to the Stratus
Controller. The Stratus Controller supports multivendor solutions for both radios and consoles through the FSI
standard. The Stratus Controller is comprised of a server (located anywhere on the WAN / LAN) with embedded
fi rmware.

DFSI CONSOLE

CODAN RADIO SYSTEM WITH UIC

TRANSMITTER

RECEIVER

UIC

FREQUENCY (MHz)

ETHERNET

TX A

RX A

TX B

RX B

FREQUENCY (MHz)

AD

AD
REF
IN

NORM

SQ. DISABLE
OFF
KEY TX

NORM
ANALOG

MICMODE

DIGITAL

OFF

REF

USB

ZEROIZE

PULL DOWN
TO REMOVE

IN

CNTL

KEY

BUS

USB

RFNI

MIC RF OUT

USB

CNTL
BUS

MADE IN CANADA

MADE IN CANADA

MODEL # CODE

MODEL # CODE

DFSI CONSOLE

IP NETWORK (FSI)

IP NETWORK (FSI)

STRATUS CONTROLLER

PHYSICALLY LOCATED ANYWHERE ON NETWORK

IP NETWORK (FSI)

IP NETWORK (FSI)

OVER 3G / 4G LTE CELLULAR

SYSTEM REGULATOR

FUNCTION

ANTENNA A

1

12

2

11

3

10

4

9

5

8

RX A

67

+

VOL METER

-

TX A
ON
OFF

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

CODAN RADIO SYSTEM WITH UIC

TRANSMITTER

RECEIVER

UIC

FREQUENCY (MHz)

ETHERNET

TX A

RX A

TX B

RX B

FREQUENCY (MHz)

AD

AD

REF

IN

NORM

SQ. DISABLE
OFF
KEY TX

NORM
ANALOG

MICMODE

DIGITAL

OFF

REF

USB

ZEROIZE

PULL DOWN
TO REMOVE

IN

CNTL

KEY

BUS

USB

RFNI

MIC RF OUT

USB

CNTL
BUS

MADE IN CANADA

MADE IN CANADA

MODEL # CODE

MODEL # CODE

IP NETWORK (FSI)

OVER DIGITAL MICOWAVE

SYSTEM REGULATOR

FUNCTION

ANTENNA A

1

12

2

11

3

10

4

9

5

8

RX A

67

+

VOL METER

-

TX A
ON
OFF

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

CODAN RADIO SYSTEM WITH UIC

TRANSMITTER

RECEIVER

UIC

FREQUENCY (MHz)

ETHERNET

TX A

RX A

TX B

RX B

FREQUENCY (MHz)

AD

AD
REF
IN

NORM

SQ. DISABLE
OFF
KEY TX

NORM
ANALOG

MICMODE

DIGITAL

OFF

REF

USB

ZEROIZE
KEY

USB

PULL DOWN
TO REMOVE

IN

CNTL
BUS

USB

RFNI

MIC RF OUT

CNTL
BUS

MADE IN CANADA

MADE IN CANADA

MODEL # CODE

MODEL # CODE

SYSTEM REGULATOR

FUNCTION

ANTENNA A

1

12

2

11

3

10

4

9

5

8

RX A

67

+

VOL METER

-

TX A
ON
OFF

SPKR

INT
EXT

EXT

SPKR

MADE IN CANADA

SUBSCRIBER

SUBSCRIBER

Figure 1: Sample Stratus Controller Application

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TECHNICAL NOTES

MT-4 Radio Systems

TN670 Stratus Controller

The Stratus Controller listens to all incoming data from every connected radio site and every console. Each
connection (from site to site or console to site) uses routing rules confi gured in the software to decide on the routing
path. These routing paths are determined by NAC or Talk Group ID. Each connection can use diff erent mapping.

The Stratus Controller has the capability to convert from any NAC to any Talk Group ID and vice versa. This allows
for any combination of mapping (affi liating) between all sites using any type of P25 code.

Local repeating (at the repeater site) will repeat ALL NACs since the receiver is programmed for $F7F at all
sites. Local Repeating can be done through the Stratus Controller however, latency (200 – 700 ms depending on
complexity) can occur.

Each site can allow ALL Unit IDs, or can be programmed to allow specifi c Unit IDs per site. The Stratus Controller
is not capable of routing based on Unit ID, but will block Units from sites.

The Stratus Controller has the following capabilities / features:

• Create an FSI Fixed Station connection

• Create an FSI Gateway connection

• Register P25 Talkgroups

• Register P25 Subscriber units

• Confi gure audio to be routed between specifi c FSI connections

• Using NAC based routing

• OR Talkgroup based routing

• Translate NAC codes for re-broadcast

• Log call activity and errors (playback not yet available)

• Forced remote reset

• Backup / Restore confi guration fi les

• Update Firmware

• Buff er and correct network voice issues (with limitations)

• When used with a Codan UIC card

• Control channel selection

• Local repeat / No repeat / Stratus Controller repeat selection

• Read 9.5 VDC and 13.8 VDC voltage inputs

• Read 4 Analog and 4 Digital General Purpose I/O (GPIO) status

• Report Rx / Tx Status (Active / Inactive)

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MT-4 Radio Systems

TN670 Stratus Controller

Stratus Controller Software Features

The Stratus Controller software allows for remote (IP) confi guration and monitoring of the Stratus Controller using
any web browser as the Graphical User Interface (GUI). This means that no software package is required for the
Stratus Controller GUI.

The Stratus Controller GUI has a secure login screen as shown in Figure 2.

Figure 2: Stratus Controller GUI Secure Login

The Stratus Controller GUI allows the user to confi gure both DFSI parameters for each radio site as well as multiple
console DFSI connections through Fixed Site emulation, as shown in Figure 3.

Figure 3: Stratus Controller GUI Confi guration

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TECHNICAL NOTES

MT-4 Radio Systems

TN670 Stratus Controller

The Stratus Controller GUI shows the layout of the Stratus Controller system as a tree. Real-Time Site Monitoring
is available through the GUI that can display frequently updated (< 5 seconds) system status as shown in Figure

4. The Stratus Controller GUI also has General purpose I/O (4 digital, 4 analog) and voltage monitoring capability
for each radio site.

Figure 4: Stratus Controller GUI Status

The Stratus Controller GUI allows for NAC (Normal Squelch) OR Talk Group ID (Selective Squelch) routing,
confi gurable at each site as shown in Figure 5. Priorities can also be set per site, for each NAC or TGID, to allow
diff erent users or groups higher or lower routing priority if a signaling confl ict occurs. See Figure 6.

Figure 5: Stratus Controller GUI NAC and TGID Routing Figure 6: Stratus Controller GUI Priorities

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MT-3/4 Radio Systems

TN710 ET-3 Transportable Radio System Case

The ET-3 transportable radio system case is a rugged, waterproof aluminum case. Any standard 19” Codan subrack
can be mounted inside for repeater, crossband or base confi gurations.

The ET-3-03-00 Orange Transportable Case includes the following:

• 19” internal mounting frame for subrack and duplexers.

• smooth tamperproof and lockable latches.

• spring retracted stainless steel handles.

• pressure relief valve.

• pressure sealed RF and power inputs.

• metal cover on lid for magnetic mount antennas.

• optional internal AC to DC power supply.

The transportable radio case is 21” (53.3 cm) wide, 11” (27.9 cm) high and 15” (38.1 cm) deep, and weighs 35 lbs.
(15.88 kg) with typical radio package installed (10 lbs. or 4.54 kg empty).

Frequency band RF Power Output Internal duplexer frequency separation

AM 1.0 - 3.0 Watts No duplexer available
Lowband VHF 0.5 - 3.0 Watts No duplexer available
Highband VHF 0.5 - 8.0 or 30 Watts ≥ 2.0 MHz or ≥ 4.5 MHz separation
400 MHz UHF 0.5 - 8.0 or 30 Watts ≥ 5.0 MHz separation
700 MHz UHF 0.5 - 3.0 Watts ≥ 30 MHz separation
800 MHz UHF 0.5 - 3.0 Watts ≥ 45 MHz separation
900 MHz UHF 0.5 - 3.0 Watts ≥ 24 MHz or ≥ 39 MHz separation

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MT-3/4 Radio Systems

TN710 ET-3 Transportable Radio System Case

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TECHNICAL NOTES

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MT-3/4 Radio Systems

TN720 ET-4 Transportable Radio System Case

The ET-4 transportable radio system case is a compact watertight polyethylene case. Any standard 19” Codan
subrack can be mounted inside for repeater, crossband or base confi gurations.

The ET-4 case includes the following:

• 19” internal mounting frame with 9 RU of rack space for equipment.

• soft grip handles, in-line wheels, press and pull latches and a telescoping handle.

• interface connectors for RF and power inputs (optional Ethernet RJ45 connector available).

The ET-4 tranportable radio system typically holds:

• Subrack (3 RU).

• Duplexer (2RU).

• PSA-12-15-RB-20 Power Module that includes a 6 W speaker, AC-DC (110/220 Vac to 12 Vdc) power converter
and battery trickle charger for the internal 10.5 Ah Sealed Lead Acid (AGM) battery (2 RU).

• ET-4-A-ACC-BOX Accessory Storage Box case for tools, cables, microphone, etc. (2RU).

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN720 ET-4 Transportable Radio System Case

The transportable radio case is 24.6” (62.5 cm) wide, 11.7” (29.7 cm) high and 19.7” (50.0 cm) deep, and weighs
approximately 50 lbs. (22.68 kg) with typical radio package installed. The maximum depth for equipment from the
rack to the bottom of the case is 8.25” (20.96 cm).

Frequency band RF Power Output Internal duplexer frequency separation

Highband VHF 0.5 - 8.0 or 30 Watts ≥ 2.0 MHz or ≥ 4.5 MHz separation
400 MHz UHF 0.5 - 8.0 or 30 Watts ≥ 5.0 MHz separation
700 MHz UHF 0.5 - 3.0 Watts ≥ 30 MHz separation
800 MHz UHF 0.5 - 3.0 Watts ≥ 45 MHz separation
900 MHz UHF 0.5 - 3.0 Watts ≥ 24 MHz or ≥ 39 MHz separation

There are several diff erent versions of the ET-4 case:

ET-4-A09-00 Black Polyethylene Transportable Case Only.
ET-4-A09-02 Black Polyethylene Transportable Case with Power Module and Accessory Storage Box.
ET-4-A09-10 Yellow Polyethylene Transportable Case Only.
ET-4-A09-12 Yellow Polyethylene Transportable Case with Power Module and Accessory Storage Box.

The ET-4 duty cycle and operating temperature is variable as follows:

Case Lid Duty Cycle Operating Temperature Range

Open 100% -40°C to +60°C
Closed 100% -40°C to +40°C
Closed 50% -40°C to +50°C
Closed 10% -40°C to +60°C

Typical battery capacity (@10% duty cycle with 30 Watts RF power output):

8 hours (10.5 AHr internal battery)
30 hours (35 AHr external battery)
90 hours (100 AHr external battery)

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MT-4 Radio Systems

TN730 ET-5 Transportable Tactical Radio System

The ET-5 transportable tactical radio system is mounted in a compact watertight polyethylene case. Any Codan
MT-4E receiver and transmitter can be mounted inside for repeater confi gurations. The ET-5 supports analog and
transparent P25 digital (clear or secure) repeat capability.

The ET-5 includes the following:

• internal mounting frame for MT-4E receiver and transmitter.

• soft grip handle and press and pull latches.

• interface connectors for RF and power inputs.

• LED indicators for receive, transmit and power indication.

• internal duplexer mounting capability.

• USB type A to right angled 5 pin mini-type B programming cable (CBLC44-20904200)

• two switches to control the power input confi guration (internal / external).

The ET-5 transportable tactical radio system can be powered by:

• a standard alkaline D-Cell battery pack (holding 16 batteries).

• a 10.5 Ah rechargeable lead acid battery.

• an external 12 Vdc power source (connector is located on the outside of the case).

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TECHNICAL NOTES

MT-4 Radio Systems

TN730 ET-5 Transportable Tactical Radio System

The transportable radio case is 14.2” (36.1 cm) wide, 11.4” (29.0 cm) high and 6.5” (16.5 cm) deep, and weighs 20
lbs. (9.07 kg) fully equipped with batteries installed.

Frequency band RF Power Output Internal duplexer frequency separation

Highband VHF 0.5 - 6.0 Watts ≥ 4.5 MHz separation
400 MHz UHF 0.5 - 6.0 Watts ≥ 5.0 MHz separation
700 MHz UHF 0.5 - 3.0 Watts ≥ 30 MHz separation
800 MHz UHF 0.5 - 3.0 Watts ≥ 45 MHz separation
900 MHz UHF 0.5 - 3.0 Watts ≥ 24 MHz or ≥ 39 MHz separation

* The RF power output of the Highband VHF and 400 MHz UHF transmitter is rated at a maximum of 6.0 Watts when
installed in the ET-5 case (typical power output of these transmitters is 8.0 Watts).

Typical battery capacity (@20% duty cycle with 6.0 Watts RF power output):

16 alkaline D-Cells batteries 19 hours
internal 10.5 Ah lead acid battery 20 hours
external 35 Ah lead acid battery 52 hours

The ET-5 operating temperature is rated at -20°C to +50°C when using the internal batteries. When using the
external battery, the operating temperature is rated at -30°C to +60°C.

The ET-5 is rated for 100% continuous duty operation.

The ET-5 case with the inside panel removed is shown in Figure 1. This shows how the MT-4E receiver and
transmitter are mounted inside of the ET-5 case.

RECEIVER

TRANSMITTER

Figure 1: ET-5 case with inside panel removed

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TN735 ET-6 Transportable Tactical Radio System

The ET-6 transportable tactical radio system is mounted in a compact watertight polyethylene case. Any Codan
receiver, transmitter and 30 Watt power amplifi er can be mounted inside for repeater or base confi gurations. The
ET-6 supports analog and transparent P25 digital (clear or secure) repeat capability.

The ET-6 includes the following:

• internal mounting frame for receiver, transmitter and 30 Watt power amplifi er.

• soft grip handle and press and pull latches.

• interface connectors for RF and AC/DC power inputs (internal or external).

• internal “quick change” duplexer mounting capability.

• lightweight OTTO headset (A-HEADSET-01).

• USB type A to right angled 5 pin mini-type B programming cable (CBLC44-20904200)

• 15 Amp 110 / 220 VAC power supply with battery backup

• front panel control interface

The following options are available for the ET-6:

• A-MIC-05 hand microphone compatible with the headset connector.

• A-PK-RELAY-02 Antenna Relay for base station operation.

There are two diff erent versions of the ET-6:

ET-6-M03-01 Standard external RF and power connectors.
ET-6-M03-02 Internal stealth RF and power connectors

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN735 ET-6 Transportable Tactical Radio System

The ET-6 tranportable radio system comes with a front panel control interface with the following features:

• internal interface connectors for RF and AC/DC power inputs (for stealth appearance with the lid closed).

• LED indicators for receive, transmit, power and speaker power indication.

• Clear / Secure select switch and Clear Keys button for encrypted base capability.

• 16 position channel select rotary switch.

• speaker / headset select, 12 pin Hirose connector for headset, volume control knob and main power switch.

• DB25 auxiliary connector for direct connection to a Telex DSP-223 or IP-223 / IP-224 (or another external device).

The transportable radio is 18.2” (46.2 cm) wide, 6.7” (17.0 cm) high and 13.4” (34.0 cm) deep, and weighs 28 lbs.
(12.70 kg) fully equipped.

Frequency band RF Power Output Internal duplexer frequency separation

Highband VHF 0.5 - 8.0 or 30 Watts ≥ 4.5 MHz separation
400 MHz UHF 0.5 - 8.0 or 30 Watts ≥ 5.0 MHz separation
700 MHz UHF 0.5 - 3.0 Watts ≥ 30 MHz separation
800 MHz UHF 0.5 - 3.0 Watts ≥ 45 MHz separation
900 MHz UHF 0.5 - 3.0 Watts ≥ 24 MHz or ≥ 39 MHz separation

The ET-6 duty cycle and operating temperature is variable as follows:

Case Lid Duty Cycle Operating Temperature Range

Open 100% -30°C to +60°C (Optional -40°C to +60°C)
Closed 100% -30°C to +10°C (Optional -40°C to +10°C)
Closed 50% -30°C to +40°C (Optional -40°C to +40°C)
Closed 10% -30°C to +60°C (Optional -40°C to +60°C)

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MT-3/4 Radio Systems

TN735 ET-6 Transportable Tactical Radio System

The ET-6 case with the lid removed is shown in Figure 1. This shows how the receiver, transmitter and power
amplifi er are mounted inside of the ET-6 case.

30 WATT POWER

TRANSMITTER

AMPLIFIER

RECEIVER

Figure 1: ET-6 case with case lid removed

The DB25 auxiliary connector pinout is as follows:

Pin Function Notes

7 Ground
8 Transmitter CSEL0 Jumper JU5A installed to operate
9 Transmitter CSEL2 Jumper JU5A installed to operate
12 Receiver Balanced O/P 2
13 Transmitter Balanced I/P 2
14 Transmitter PTT I/P
17 Transmitter Secure / Clear I/P Pull to ground for Clear mode
20 +13.8 Vdc / Receiver COR Jumper JU1A (DSP-223) / Jumper JU1B (IP-223 / IP-224)
21 Transmitter CSEL1 Jumper JU5A installed to operate
22 Transmitter CSEL3 Jumper JU5A installed to operate
24 Receiver Balanced O/P 1
25 Transmitter Balanced I/P 1

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.

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TECHNICAL NOTES

MT-3/4 Radio Systems

TN735 ET-6 Transportable Tactical Radio System

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