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

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

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

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

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

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

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
CANADA/US

[phone] | TOLL FREE [phone]

CODANCOMMS.COM

[e-mail]

Page 1 of 2

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

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 2

CODANCOMMS.COMTECHNICAL NOTE: TN105, REV 6-0-0, © Nov 2018

[e-mail]

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.

TN110, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 1 of 4

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.

TN110, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 4

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

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

CANADA/US [phone] | TOLL FREE [phone]

A21

B21

(P1)

AUXILIARY

CONNECTOR

A-PNL-AUX96-3

C21

PWR

JU102

JU103

GPIO23

GPIO22

(GND ENABLES

(GND DISABLES

LOCAL CONTROL)

LOCAL CONTROL)

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

Page 3 of 4

TN110 Channel and Frequency Selection

This Page Intentionally Left Blank

TECHNICAL NOTES

MT-3/4 Radio Systems

TN110, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

Page 4 of 4

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

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)

TN150, REV 1-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

Page 1 of 2

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

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 2

LINE

2 or 4 WIRE

INPUT / OUTPUT

RX

RADIO

TX

LINE

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

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.

TN151, REV 2-0-0, © Nov 2018

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 1 of 2

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.

TN151, REV 2-0-0, © Nov 2018

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 2

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-3/4 Radio Systems

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.

TN152, REV 1-0-0, © Jan 2019

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 1 of 4

TECHNICAL NOTES

MT-3/4 Radio Systems

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

TN152, REV 1-0-0, © Jan 2019

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 4

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-3/4 Radio Systems

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

TN152, REV 1-0-0, © Jan 2019

Tx-F3
Rx-F4

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

Page 3 of 4

TECHNICAL NOTES

MT-3/4 Radio Systems

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

TN152, REV 1-0-0, © Jan 2019

CANADA/US [phone] | TOLL FREE [phone]

Page 4 of 4

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-3/4 Radio Systems

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

TN160, REV 5-0-0, © Nov 2018

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 1 of 2

TECHNICAL NOTES

MT-3/4 Radio Systems

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.

TN160, REV 5-0-0, © Nov 2018

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 2

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-4 Radio Systems

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

TN175, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

Page 1 of 4

TECHNICAL NOTES

MT-4 Radio Systems

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.

TN175, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 4

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-4 Radio Systems

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.

TN175, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 3 of 4

TECHNICAL NOTES

MT-4 Radio Systems

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.

TN175, REV 4-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

Page 4 of 4

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

TECHNICAL NOTES

MT-4 Radio Systems

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.

TN180, REV 1-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

Page 1 of 2

TN180 P25 Digital Ping Feature

This Page Intentionally Left Blank

TECHNICAL NOTES

MT-4 Radio Systems

TN180, REV 1-0-0, © Aug 2016

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 2

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-4 Radio Systems

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

TN181, REV 1-0-0, © Mar 2017

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 1 of 2

TECHNICAL NOTES

MT-4 Radio Systems

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.

TN181, REV 1-0-0, © Mar 2017

CANADA/US [phone] | TOLL FREE [phone]

Page 2 of 2

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

TECHNICAL NOTES

MT-4 Radio Systems

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.

TN182, REV 1-0-0, © Mar 2017

CANADA/US [phone] | TOLL FREE [phone]

[e-mail]

CODANCOMMS.COMTECHNICAL NOTE:

Page 1 of 8

TECHNICAL NOTES

MT-4 Radio Systems

TN182 Battery Level Reporting and Remote P25 Test Tone

Figure 1: Transmitter Battery Level Reporting

TN182, REV 1-0-0, © Mar 2017

CANADA/US [phone] | TOLL FREE [phone]

CODANCOMMS.COMTECHNICAL NOTE:

[e-mail]

Page 2 of 8