Codan MT-3 Instruction Manual

Technical Note for Tuning, Testing,
Maintaining and Servicing
MT-3 FM Analog Radio Systems
with the IFR COM-120 (B or C) by Aeroflex
TN910
Codan MT-3 and
IFR COM-120 by Aeroflex
Test Procedures
Codan Radio Communications
43 Erie Street
Victoria, British Columbia
Canada V8V 1P8
International
Phone: [phone]
Fax: [phone]
Email: [email protected]
Web: www.codanradio.com
Toll Free Canada and U.S.A.
Phone: [phone]
Fax: [phone]
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 2 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Table of Contents
General Set-Up and Connections............................................................................. Page 3
System Regulator Testing
System Voltage Testing.................................................................................................. Page 4
Receiver Testing
Set-Up............................................................................................................................ Page 5
Distortion ........................................................................................................................ Page 6
Sensitivity (12 dB SINAD)............................................................................................... Page 6
Squelch........................................................................................................................... Page 6
Receiver andAuxiliary (AC-3E) OutputAudio Levels..................................................... Page 7
CTCSS Decode.............................................................................................................. Page 8
Receiver Front EndAlignment and Tuning..................................................................... Page 9
Transmitter Testing
Set-Up............................................................................................................................ Page 10
Distortion ........................................................................................................................ Page 12
RF Power........................................................................................................................ Page 12
Frequency Stability......................................................................................................... Page 12
Transmitter Deviation Levels.......................................................................................... Page 12
Auxiliary (AC-3E) InputAudio Levels.............................................................................. Page 13
CTCSS Encode.............................................................................................................. Page 13
Duplex Testing
Set-Up............................................................................................................................ Page 14
Distortion ........................................................................................................................ Page 15
Repeater Deviation Levels ............................................................................................. Page 15
Important Information
This Technical Note is intended as an aid to configuring and testing Codan radios using an IFR COM-120 (B or C)
Service Monitor by Aeroflex. Neither Codan Limited or Aeroflex Inc. assume responsibility for damage caused to
either unit as a result of misinterpretation or misuse of this procedure. Codan manufactured Products are warranted
against defective materials and workmanship. This warranty does not extend to damage due to misuse, neglect,
accident, improper configuration or installation. Codan and Aeroflex shall be released from all obligations under
its respective warranty in the event the Products are subject to misuse, neglect, alteration, accident, improper
installation or testing, or if un-authorized repairs are performed by the Customer or others. These procedures can
be modified, changed and altered at any time to better suit your specific needs and requirements.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 3 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
General Set-Up and Connections
Frequencies and Bandwidths:
The receiver and transmitter modules are individually programmed with RF frequencies and are also designed for
wideband or narrowband operation. Familiarize yourself with all of the transmitter and receiver settings before
testing or tuning the Codan radio system.
Typical Specifications:
This document refers to some TYPICAL receiver and transmitter specifications. Refer to the Instruction Manuals
for complete radio system specifications.
Adapters, Cables and Extender Cards:
Various adapters, cables and extender cards are required for the different radio tests. Extender cards and adapters
are available from Codan Radio Communications. The receiver front end filter tuning requires an SMB - BNC
adapter (5192-WJ01BJ01) that is available from Codan Radio Communications.
Control Cards:
Most Codan MT-3 radio systems have an AC-3E or AC-3L-96 Audio Control Card for use in the radio system. The
Control Cards connect to the receiver and transmitter balanced audio lines with an unbalanced load, which could
cause some measurements to be in error. If the radio system includes an Audio Control Card, remove the control
card from the rack for the individual receiver and transmitter tests unless otherwise noted.
Audio Connections:
The Receiver, Transmitter andAuxiliary Balanced audio lines are available for connection on Codan extender cards
or by connecting to the optional back panel A-PNL-AUX96-3 screw-type terminal connector. The extender cards
have solder points available on each signal line that can have a small test point, (5059-TP110300) that is supplied
with the extender card, soldered to them for easy connection with clip-on type clips. Recommended Test Points are:
Audio Control Card Extender Card pins (EC-96D1 and EC-96K-1.22):
Auxiliary 1 Audio Output = B11 & A11
Auxiliary 2 Audio Output = C1 & C3
Auxiliary 1 Audio Input = C19 & C20
Auxiliary 2 Audio Input = B14 & A14
Receiver and Transmitter Extender Card pins (EC-48RD and EC-48RK-1.22):
Rx Balanced Audio Output = B26 & Z26
Tx Balanced Audio Input = B18 & Z18
Tx Subtone Input = B22 & Ground (B32)
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 4 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
System Regulator Testing
System Voltage Testing
The first stage of testing a Codan MT-4E radio system is to perform a basic system check on the supply and
regulated voltages. The System Regulator module is designed with a convenient and easy test point built in to the
front panel. This test point allows a technician access to the DC supply and regulated voltages. Simply connect
a standard Digital Volt Meter (DVM) to the METER jacks on the front panel of the System Regulator as shown in
Figure 1.
Figure 1: System Regulator Voltage Testing
The FUNCTION rotary switch on the front panel of the System Regulator will allow you to test various points in the
radio system. Following is a list of System Regulator rotary switch positions, the functions they measure and the
parameters measured:
1 Supply Voltage +10 Vdc to +17 Vdc (+13.8 Vdc nominal)
2 +9.5 Volts Regulated +9.5 Vdc (± 0.1 Vdc)
3 Rx AAudio Receiver AAudio (NOT Rx Balanced Output)
4 Rx A Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
(0 Vdc is a low RF signal level, +5.0 Vdc is high)
5 Rx B Audio Receiver B Audio (NOT Rx Balanced Output)
6 Rx B Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
(0 Vdc is a low RF signal level, +5.0 Vdc is high)
The standby current draw of the radio system should be measured for battery / solar powered systems. Connect
an ammeter to the power input line and measure the standby current draw and transmit current draw of the system.
The maximum standby and transmit current draw is dependant on the radio system (number and class of receivers,
transmitter output power, amplifiers, auxiliary equipment, etc.).
Backwards Compatibility
The SM-3 System Regulator is a direct replacement for the SM-3 System Monitor, however, the rotary switch
positions for the front panel test points have been changed.
SQ . DI SA B L E
N
O
RMO
FF
RF NI
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TX
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
FREQUENCY (MHz)
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
57
57
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULL DOWN
TO REMOVE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
MIN MAXHOLD REL
%
ms
Hz RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
AmA COM V
TEMPERATURE
A
MIN MAXHOLD REL
%
ms
Hz RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
AmA COM V
TEMPERATURE
A
AutoHOLD LOGGING
SAVECANCEL
FAST MN MX
SETUP
YES
NO
DIGITAL MULTIMETER
CLEAR MEM
VIEW
DC
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 5 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Receiver Testing
Connect the IFR COM-120 and Codan radio as shown in Figure 2:
Figure 2: Receiver Testing
Select the GEN MODE button and set up the IFR COM-120 as shown in Figure 3:
Figure 3: IFR COM-120 Receiver Test Configuration
The AF LEVEL and SCOPE may not read as shown; these levels are set with an external 600 ohm matching load.
Audio levels will read higher without the matching load. See the Receiver andAuxiliary OutputAudio Level section
for more information. Enter the correct RF frequency, and ensure that the deviation level is set at ± 60% maximum
deviation (±3.0 KHz wide / ±1.5 KHz narrow).
On the Codan Radio system, ensure the receiver is turned on and turn the System Regulator Speaker switch ON.
Ensure the rotary select switch is set to the correct Receiver Audio (depending on the receiver being tested), then
turn the volume up until the 1 KHz tone is audible.
Rx Balanced Audio Output
(from pins B26 and Z26)
T/R port from IFR COM-120
to RF IN on Rx
AUDIO / DATA
SINAD IN
Note: The Audio Control Card should
be removed for all but the Auxiliary
Audio and CTCSS decode tests.
STORE RCL
SHOW
LIST SETUP
MEMORY
INSTRUMENTS
ANLYZSCOPE
MTRS AUDIO
GEN
MODE
RECGEN
SPCL
DPLX
DATAENTRY
132
456
789
*0#
+/-
.
SHIFT
ENTER
C
O
N
T
R
O
L
ESC
HOLD
SCRN
START
STOP
TAB
DATASCROLL
ANTENNA
10 W MAX
50 W
PHONES
SQUELCH
VOLUME
T / R
RF IN/OUT
AUX
RF OUT
AUDIO/DATA
GEN OUT
DEMOD
OUT
MIC / ACCEXT MOD
IN
AUDIO/DATA
SINAD IN
SCOPE/DVM
IN
POWER
SQ. DI SA B L E
N
O
RMO
FF
RF NI
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TX
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
FREQUENCY(MHz)
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
57
57
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULLDOWN
TOREMOVE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 6 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Distortion:
Receiver audio distortion is typically less than 3.0 %.
Sensitivity (12 dB SINAD):
HighlightDISTORTIONandselectSINAD. HighlightLEVELandpushenteronthekeypad,thenslowlyturntheDATA
SCROLL spinner down to lower RF generator levels while monitoring the SINAD meter. The receiver sensitivity
point is where the RF generator level is for a 12 dB SINAD reading (The SINAD meter tends to jump around, look
for the closest RF level for an average of 12 dB SINAD). Receiver sensitivity is typically -116 dBm to -118 dBm
depending on the receiver model.
The IFR COM-120 setup as shown in Figure 4 shows a receiver with -119.0 dBm senstivity:
Figure 4: IFR COM-120 Sensitivity Test Configuration
If the Distortion or SINAD measurements are not within Codan published specifications, the Front End may need
re-alignment. Refer to the Receiver Front End Alignment and Tuning section.
Squelch:
To check the receiver squelch points, adjust the RF carrier level up and down with the DATA SCROLL spinner until
the receiver squelches and unsquelches. There should be approximately 6 dBm of hysteresis (centered around the
sensitivity point) on MT-3 receivers. The squelch and unsquelch point can be adjusted on the receiver mainboard
(R88 & R115). Refer to the Instruction Manual or Technical Note for squelch setting procedures.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 7 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Receiver and Auxiliary (AC-3E) Output Audio Levels:
The audio level adjustment can be done on both the Rx Balanced Audio Output and the Auxiliary Balanced Output
(1 and 2). The Auxiliary Balanced Output is only available on the AC-3E Control Card. The Receiver and Auxiliary
Balanced Audio Outputs are 600 ohm balanced audio outputs and will require an external 600 ohm matching load
before an accurate measurement of the audio level can be performed by the IFR COM-120.
Rx Balanced Output:
1. Ensure the receiver is turned on and the Audio Control Card is NOT plugged into the subrack.
2. Adjust the Rx Balanced Audio level adjustment (R64 the High Level Drive Adjust) for -8.0 dBm audio level (308
mVrms @ 600 ohms). If no external 600 ohm load is available, the audio level could be adjusted for approximately
585 mVrms in the IFR COM-120.
Auxiliary Balanced Output (1 & 2):
1. Ensure the receiver is turned on and the Audio Control Card IS plugged into the subrack.
2. Connect the Auxiliary Balanced Audio Output (1 or 2) from theAC-3E to theAUDIO/DATA SINAD IN input on the
IFR COM-120.
3. Adjust the Auxiliary Balanced Audio level adjustment (R13 for Aux Out 1, R56 for Aux Out 2) for 0.0 dBm audio
level (775 mVrms @ 600 ohms). If no external 600 ohm load is available, the audio level could be adjusted for
approximately 2.50 Vrms in the IFR COM-120.
To select between dBm and Vrms, highlight AF LEVEL and select ZOOM as shown in Figure 5 . Highlight the
measurement units and select Vrms or dBm (ensure that the impedance is set to 600 Ohms when selecting dBm)
as shown in Figure 6. Hit RETURN to return to the GENERATE window.
> >
> >
> >
Figure 5: IFR COM-120 Audio Level Configuration Figure 6: IFR COM-120 Impedance Selection
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 8 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
CTCSS Decode:
To check the CTCSS decode of the receiver, plug the Audio Control Card into the subrack and ensure that the
CTCSS decode switch is turned ON (if applicable). When the decoder is turned ON, the receiver will mute and
audio will no longer be audible at the System Regulator speaker.
If the Auxiliary Balanced Output test was the last test performed, re-connect the Receiver Balanced Audio Output
to the AUDIO/DATA SINAD IN input on the IFR COM-120. Ensure the 1.0 KHz audio tone is still injected into the
receiver (with GEN1) and that the deviation level is set at ± 60% maximum deviation (±3.0 KHz wide / ±1.5 KHz
narrow).
To inject the CTCSS tone into the receiver, highlight Mod Src and select GEN2, then highlight OFF and select FM as
shown in Figure 7. Highlight Freq and enter the CTCSS decode tone, then highlight Deviation and enter a deviation
of ±0.50 KHz wide / ±0.35 KHz narrow.
Figure 7: IFR COM-120 CTCSS Test Configuration
The receiver will now un-mute and the 1 KHz tone (and possibly the CTCSS tone) will be audible on the System
Regulator speaker. If the receiver does not un-mute, check that the correct CTCSS tone frequency is entered in
the IFR COM-120.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 9 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Receiver Front End Alignment and Tuning:
Tuning of the Front End filter is typically only required when the Sensitivity or Distortion does not meet published
specifications, or when the receiver RF frequency is changed beyond the band pass of the filter (typically 5 - 7
MHz).
Connect the IFR COM-120 and Codan radio as as shown in Figure 8:
Figure 8: Receiver Front End Alignment and Tuning
The internal cable in the receiver from the output of the front end terminates in an SMB connector. The SMB plugs
directly into the Receiver 21.4 MHz IF /Audio Main Board. Disconnect the SMB cable from the Mainboard connector
and use the SMB-BNC adapter to connect this point to the ANT input on the IFR COM-120.
Select the ANLYZ INSTRUMENTS button and set up the IFR COM-120 as shown in Figure 9:
Figure 9: IFR COM-120 Spectrum Analyzer Configuration
Enter the correct RF frequency and ensure the receiver is turned on. The filter waveform will appear on the scope
display. To tune the Front End filter, remove the dust caps on the variable capacitors and, starting from the capacitor
closest to the front panel and moving back, tune the filter to its new frequency.
Front End output from Receiver
to ANTENNA input on IFR COM-120
AUX RF OUT port from IFR COM-120
to RF IN on Rx
STORE RCL
SHOW
LIST SETUP
MEMORY
INSTRUMENTS
ANLYZSCOPE
MTRS AUDIO
GEN
MODE
RECGEN
SPCL
DPLX
DATAENTRY
132
456
789
*0#
+/-
.
SHIFT
ENTER
C
O
N
T
R
O
L
ESC
HOLD
SCRN
START
STOP
TAB
DATASCROLL
ANTENNA
10 W MAX
50 W
PHONES
SQUELCH
VOLUME
T / R
RF IN/OUT
AUX
RF OUT
AUDIO/DATA
GEN OUT
DEMOD
OUT
MIC / ACCEXT MOD
IN
AUDIO/DATA
SINAD IN
SCOPE/DVM
IN
POWER
SQ. DI SA B L E
N
O
RMO
FF
RF NI
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TX
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
FREQUENCY(MHz)
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
57
57
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULLDOWN
TOREMOVE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 10 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Transmitter Testing
Connect the IFR COM-120 and Codan radio as shown in Figure 10:
Figure 10: Transmitter Testing
Select the REC MODE button and set up the IFR COM-120 as shown in Figure 11:
Figure 11: IFR COM-120 Transmitter Test Configuration
Enter the correct RF frequency, and ensure that the transmitter is set to KEY TX and theAudio Control Card is NOT
plugged into the subrack. Set the receive audio filters and AF Generator frequency and level as shown in Figures
12 through 15.
MINMAXHOLD REL
%
ms
Hz RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
AmA COM V
TEMPERATURE
A
MINMAXHOLD REL
%
ms
Hz RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
AmA COM V
TEMPERATURE
A
AutoHOLD LOGGING
SAVECANCEL
FASTMN MX
SETUP
YES
NO
DIGITAL MULTIMETER
CLEARMEM
VIEW
Tx Balanced Audio Input
(to pins B18 and Z18)
T/R port from IFR COM-120 to RF OUT on Tx
AUDIO/DATA
GEN OUT
Note: The Audio Control Card should
be removed for all but the Auxiliary
Audio and CTCSS encode tests.
*Tx Subtone Input 1
Deviation Level Test
(to pins B22 and Ground (B32))
Optional
External DVM
Connected to
Tx Balanced
Audio Input
STORE RCL
SHOW
LIST SETUP
MEMORY
INSTRUMENTS
ANLYZSCOPE
MTRS AUDIO
GEN
MODE
RECGEN
SPCL
DPLX
DATAENTRY
132
456
789
*0#
+/-
.
SHIFT
ENTER
C
O
N
T
R
O
L
ESC
HOLD
SCRN
START
STOP
TAB
DATASCROLL
ANTENNA
10 W MAX
50 W
PHONES
SQUELCH
VOLUME
T / R
RF IN/OUT
AUX
RF OUT
AUDIO/DATA
GEN OUT
DEMOD
OUT
MIC / ACCEXT MOD
IN
AUDIO/DATA
SINAD IN
SCOPE/DVM
IN
POWER
SQ. DI SA B L E
N
O
RMO
FF
RF NI
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TX
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
FREQUENCY(MHz)
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
57
57
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULLDOWN
TOREMOVE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 11 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
To set the IFR COM-120 receive audio filters, highlight LINE and select CONFIG as shown in Figure 12. Set up
the filters as shown in Figure 13. Hit RETURN to return to the RECEIVE window.
> >
> >
> >
Figure 12: IFR COM-120 Audio Filter Configuration Figure 13: IFR COM-120 Audio Filter Selection
To set the IFR COM-120 AF Generator frequency and level, highlight AF GEN OUT and select ZOOM as shown in
Figure 14. Set up the GEN1 as shown in Figure 15. The Audio level of 0.43 Vp is 0.304 Vrms or -8.0 dBm. Hit
RETURN to return to the normal RECEIVE window.
> >
> >
> >
Figure 14: IFR COM-120 AF Generator Configuration Figure 15: IFR COM-120 AF Level Selection
This will set the proper filters and audio levels for distortion and deviation measurements.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 12 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Distortion:
Transmitter audio distortion is typically less than 2.0 %. If transmitter distortion is greater than 2.0%, the transmitter
Audio Processor may need re-tuning. Refer to the Instruction Manual or Technical Note for audio processor tuning
procedures.
RF Power:
RF power output should typically be between 0.5 to 3.0 Watts (Lowband VHF), 2.0 to 8.0 Watts (Highband VHF)
or 0.5 to 8.0 or 2.0 to 8.0 Watts (UHF 400 MHz). Adjust R48 (Lowband VHF) or R7 (VHF/UHF) in the Transmitter
Amplifier section to change the RF output power.
Connect the transmitter to the power amplifier (if used) and measure the RF power output of the amplifier. The
Codan 30 Watt Amplifier’s RF power output can be changed by adjusting the transmitter (exciter) RF power output.
Do not exceed power amplifier input levels. Higher power amplifiers typically have a fixed RF power input level and
RF power output level.
Frequency Stability:
Transmitter frequency stability is typically ± 1 ppm.
Transmitter Deviation Levels:
Transmitterdeviationistypically±60%maximumdeviation(±3.0KHzwide/±1.5KHznarrow)foranaudiofrequency
of 1.0 KHz at -8.0 dBm audio level input.
To check the transmitter maximum deviation level, highlight AF GEN OUT and select ZOOM. Enter an audio level
of 2.50 Vp (1.767 Vrms or +7.2 dBm). Ideally the audio level should be set at +10.0 dBm, but the IFR COM-120
is not capable of higher than 2.50 Vp audio level (the difference between the ideal +10.0 dBm and +7.2 dBm is
neglible for this test). Enter an audio frequency of 300.0 Hz and increase the 300.0 Hz sine wave up to 3400.0 Hz
in increments of 100.0 Hz. Monitor the analog meter in the top right corner and check that the transmitter deviation
does not rise above ± 5.0 KHz wide or ± 2.5 KHz narrow at any time.
To check the transmitter subtone input level highlight AF GEN OUT and select ZOOM. Disconnect the AUDIO/
DATA GEN OUT from the Tx Balanced Audio Input connector and connect it to the Tx Subtone Input 1 connector.
Enter an audio level of 0.14 Vp (0.098 Vrms or -18.0 dBm). Enter an audio frequency of 100.0 Hz. Hit RETURN
to return to the RECEIVE window, then set the IF BW at 15 KHz. Highlight LINE and select CONFIG, then set the
MOD METERS LOW PASS FILTER for 300 Hz. Transmitter subtone deviation is typically ±0.50 KHz wide / ±0.35
KHz narrow for -18.0 dBm audio level input.
If transmitter deviation is off by more than ± 0.15 KHz deviation, the transmitter over-deviates, or the subtone
deviationisoffby more than ± 0.10 KHz, the transmitterAudioProcessor may need re-tuning. Refer to the Instruction
Manual or Technical Note for audio processor tuning procedures.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 13 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Auxiliary (AC-3E) Input Audio Levels:
The auxiliary audio input level is set while measuring the transmitter deviation. Ensure that the IF BW is set at 30
KHz and the MOD METERS LOW PASS FILTER is set at for 20 KHz.
1. Ensure the transmitter is set to KEY TX and the Audio Control Card IS plugged into the subrack.
2. Connect AUDIO/DATA GEN OUT on the IFR COM-120 to theAuxiliary Balanced Audio Input (1 or 2).
3. Highlight AF GEN OUT and select ZOOM. Enter an audio level of 1.10 Vp (0.777 Vrms or 0.0 dBm).
4. Adjust the Auxiliary Balanced Audio level adjustment (R120 for Aux In 1, R123 for Aux In 2) for a transmitter
deviation of ± 60% maximum deviation (±3.0 KHz wide / ±1.5 KHz narrow)
CTCSS Encode:
The CTCSS encode tone can be supplied from a CTCSS decoder (encode is same tone as decode), a separate
CTCSS encoder; or some base stations may be configured for the tone remote adapter to supply the CTCSS
encode tone. These procedures are for use when the audio control card supplies the CTCSS encode tone (with a
decoder or encoder).
1. Ensure the transmitter is set to KEY TX and the Audio Control Card IS plugged into the subrack.
2. Ensure that the CTCSS encode switch is turned ON (if applicable).
3. Disconnect the Tx BalancedAudio Input from the AUDIO/DATA GEN OUT connector on the IFR COM-120.
4. In the RECEIVE window, set the IF BW at 15 KHz as shown in Figure 16.
5. Highlight LINE and select CONFIG, then set the MOD METERS LOW PASS FILTER for 300 Hz as shown in
Figure 16.
Figure 16: IFR COM-120 CTCSS Test Configuration
Adjust the Transmitter CTCSS deviation for ±0.50 KHz wide / ±0.35 KHz narrow (the adjustment pot is located
directly on the CTCSS module in the audio control card). The CTCSS encode tone is the AF Frequency.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 14 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Duplex Testing
Connect the IFR COM-120 and Codan radio as shown in Figure 17:
Figure 17: Duplex Testing
Select the DPLX MODE button and set up the IFR COM-120 as shown in Figure 18:
Figure 18: IFR COM-120 Duplex Test Configuration
Enter the correct RF frequency for both the transmitter and receiver, and ensure that the transmitter and receiver
are set to NORM. Ensure the Audio Control Card IS plugged into the subrack and the CTCSS decode and encode
are turned OFF.
T/R port from IFR COM-120
to RF OUT on Tx
AUX RF OUT port from IFR COM-120 to RF IN on Rx
STORE RCL
SHOW
LIST SETUP
MEMORY
INSTRUMENTS
ANLYZSCOPE
MTRS AUDIO
GEN
MODE
RECGEN
SPCL
DPLX
DATA ENTRY
132
456
789
*0#
+/-
.
SHIFT
ENTER
C
O
N
T
R
O
L
ESC
HOLD
SCRN
START
STOP
TAB
DATA SCROLL
ANTENNA
10 W MAX
50 W
PHONES
SQUELCH
VOLUME
T / R
RF IN/OUT
AUX
RF OUT
AUDIO/DATA
GEN OUT
DEMOD
OUT
MIC / ACCEXT MOD
IN
AUDIO/DATA
SINAD IN
SCOPE/DVM
IN
POWER
SQ . DI SA B L E
N
O
RMO
FF
RF NI
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
TX
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
FREQUENCY (MHz)
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
57
57
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULL DOWN
TO REMOVE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Rev 5-0-0 May 14
TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
Page 15 of 16
© 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
Distortion:
Complete radio system audio distortion is typically less than 5.0 %. If the radio system distortion is greater than
5.0%, the transmitter or receiver may need re-tuning. Refer to the Instruction Manual or Technical Note for tuning
procedures.
Repeater Deviation Levels:
Ensure the deviation into the receiver is set at ± 60% maximum deviation (±3.0 KHz wide / ±1.5 KHz narrow). The
transmitter deviation into the IFR COM-120 should read within ± 0.15 KHz of the input deviation.
AC-3E Audio Control Cards:
If transmitter deviation is off by more than ± 0.15 KHz deviation from the input deviation of ± 60%, adjust the audio
level matching pot on the front panel (RXA to TXA, RXA to TXB, RXB to TXA or RXB to TXB) of the Audio Control
Card until the deviation levels match.
AC-3L-96 Audio Control Cards:
If transmitter deviation is off by more than ± 0.15 KHz deviation from the input deviation of ± 60%, check the receiver
audio level and transmitter deviation level individually in the Rx and Tx modules.
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications

TN910 Codan MT-3 and IFR COM-120 Test Procedures
MT-3 Radio Systems
TECHNICAL NOTES
TN910 Rev 5-0-0 May 14Page 16 of 16 © 2014 Codan Limited All rights reserved.
43 Erie Street
Victoria, B.C.
Canada V8V 1P8
Toll Free Canada & U.S.A.
Phone: [phone]
Fax: [phone]
International
Phone: [phone]
Fax: [phone]
Internet
Email: [email protected]
Web: www.codanradio.com
This Page Intentionally Left Blank
ThisproducthasbeendiscontinuedandisnolongermanufacturedbyCodanRadioCommunications