Codan MT-4E Maintenance Manual
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Codan MT-4E Maintenance Manual

Codan MT-4E Maintenance Manual

Analog and digital radio systems
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  • Page 1 MT-4E Analog and P25 Digital Radio Systems MAINTENANCE GUIDE www.codancomms.com...
  • Page 3 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Codan MT-4E Analog and P25 Digital Radio Systems Maintenance Guide Page i...
  • Page 4 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS NOTE © 2013 Codan Limited. No part of this guide may be reproduced, transcribed, translated into any language or transmitted in any form whatsoever without the prior written consent of Codan Limited.
  • Page 5 (solar powered) is a key requirement. Codan is a pioneering member of the P25 Digital standard, for radio system interoperability between emergency response governmental organizations, providing enhanced functionality and encryption.
  • Page 6 Codan MT-4R/D and IFR 2975 Test Procedures (TN950) Technical Note TN950 is an aid to confi guring and testing Codan MT-4R/D radios using an IFR 2975 Service Monitor by Aerofl ex. TN950 is intended to be used with IFR 2975 Setup fi les that can be loaded into the Service Monitor.

  • Page 7: Table Of Contents

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Contents Chapter 1: Codan Radio Maintenance ........Introduction to Codan MT-4E ..............Recommended Maintenance Schedule ............. Repair Note ....................ESD - Electrostatic Discharge ..............Audio and Carrier Levels Reference ............
  • Page 8 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Chapter 5: Codan Radio System Testing ......MT-4E Testing with the IFR 2975 by Aerofl ex .......... General Set-Up and Connections ............Uploading Codan Confi gurations to the IFR 2975 .........18 Radio Service Software (RSS) ..............19...

  • Page 9: Chapter 1: Codan Radio Maintenance

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE CHAPTER 1: CODAN RADIO MAINTENANCE This document is written as a maintenance guide to Codan MT-4E Analog and P25 Digital Radio Systems. The document assumes the reader is familiar with conventional Two-Way Radio Communications systems and general electronics maintenance practices.

  • Page 10: Recommended Maintenance Schedule

    RE PA I R N OTE The MT-4E Radio System employs a high percentage of surface mount components which should not be removed or replaced using an ordinary soldering iron. Removal and replacement of surface mount components should be performed only with specifi cally designed surface mount rework and repair stations complete with Electrostatic Discharge (ESD) protection.

  • Page 11: Audio And Carrier Levels Reference

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE A U DI O A N D CA RR IE R L EVEL S R EFERENC E The following are conversions for both audio levels and RF carrier levels. Audio Levels 2.500 Vrms...
  • Page 12 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS This Page Intentionally Left Blank Page 4 Chapter 1: Codan Radio Maintenance...

  • Page 13: Chapter 2: Installation

    I N S TA L L ATION OF COD AN SU BRAC KS 1. Ensure the 19” rack has enough room for the Codan subrack to be installed. Each Codan subrack requires 5 1/4” height (3 RU) and 13.5” (maximum) depth clearances.
  • Page 14 To lock the quick release fasteners, push and turn the fastener 90 degrees clockwise with a fl at screwdriver. Note: MT-4E modules may be removed or inserted from the subrack while power is supplied without damaging the equipment.
  • Page 15 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE 6. If an external controller (eg. Telex tone-remote adapter) is to be connected to the system, all wiring should be made to the DB25 connector or to the optional screw-type A-PNL-AUX96-3 auxiliary terminal connector shown in Figure 2-3.
  • Page 16 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS This Page Intentionally Left Blank Page 8 Chapter 2: Installation...

  • Page 17: Chapter 3: Test Equipment And Spares

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE CHAPTER 3: TEST EQUIPMENT AND SPARES R E CO MM EN DE D T ES T EQUIPMENT Codan Communications recommends the following test equipment for maintenance of an MT-4E radio system: +13.8 Vdc Power Supply...

  • Page 18: Recommended Spares

    Codan recommends a complete radio system spare for every critical / essential site in the system. The design of Codan MT-4E radio systems makes it easy to swap components of a radio system and can save valuable time and eff ort during maintenance. The exact spares would depend on...

  • Page 19: Recommended Maintenance Items

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE R E CO MM EN DE D MAINTEN ANCE ITEM S Codan Communications recommends the following maintenance items at each radio site: A-TK-04 MT-4 Tool Kit EC-48RD 48 pin Direct Connect Extender...
  • Page 20 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS This Page Intentionally Left Blank Page 12 Chapter 3: Test Equipment and Spares...

  • Page 21: Chapter 4: Radio Site Survey

    Codan Radio Site Checklist and Inventory A Codan Radio Site Checklist and a Codan Radio Site Inventory is included in Chapter 7 of this Maintenance Guide. It is recommended that the checklist and inventory be fi lled out each time the radio site is visited.

  • Page 22: Preparation For A Site Survey

    MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS P R E PA R AT ION F OR A SITE SU RVEY When preparing for a site survey, remember to bring the following items: • Communications Service Monitor •...

  • Page 23: Exterior Site Survey

    Use the Codan Radio Site Inventory to record this information. Codan Communications suggests that customers maintain a site inventory, as serial and model numbers can help the factory with any customer support issues.

  • Page 24: Radio System Testing

    Test the radio system as detailed in Chapter 5 and 6 of this Maintenance Guide. Chapter 5 includes detailed testing information on the Codan radio system using an IFR 2975 test set, and Chapter 6 includes information on additional tests that can be performed on a complete radio system at the radio site.

  • Page 25: Chapter 5: Codan Radio System Testing

    P25 Digital Radio Systems with the IFR 2975 Service Monitor by Aerofl ex. This Chapter is intended as an aid to confi guring and testing Codan MT-4E radios using the IFR 2975. Neither Codan Limited or Aerofl ex Inc. assume responsibility for damage caused to either unit as a result of misinterpretation or misuse of this procedure.

  • Page 26: General Set-Up And Connections

    fi le can be downloaded, then unzipped and copied onto a fl oppy disk or transferred onto the network. If a Codan directory already exists on your IFR 2975 (for MT-4R/D testing), rename that directory or it will be overwrittwen by the MT-4E Codan directory.

  • Page 27: Radio Service Software (Rss)

    Codan MT-4E Radio System Test Sheet A Codan MT-4E Radio System Test Sheet is included in Chapter 7 of this Maintenance Guide. It is recommended that this test sheet be fi lled out each time the radio system is tested. If two or more pairs of transceivers are tested, use a second test sheet to record the results.

  • Page 28: Turning Off The Mt-4E Receiver And Transmitter Modules

    RJ45 cable, turning the MT-4E transmitter front panel switch to the OFF position will cause the MT-4E receiver module to turn off . The MT-4E receiver modules A and D LEDs on the front panel will blink on and off when this occurs. Turning the MT-4E receiver modules front panel switch to the OFF position will not cause any adverse eff...

  • Page 29: Audio Connections

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Audio Connections The Receiver, Transmitter and Auxiliary 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.

  • Page 30: System Regulator Testing

    S Y S T E M R E GU LATOR TEST IN G System Voltage Testing The fi rst 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 into the front panel.

  • Page 31: Receiver Testing

    Figure 5-3: Receiver Analog Testing On the IFR 2975, recall Codan setup 1 (Rx_Ana) from your internal drive. Enter the correct RF frequency and ensure that the deviation level of the 1.0 KHz tone is set correctly for your receiver (wide / narrow).
  • Page 32 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Audio Distortion: To check receiver distortion, inject -70 dBm RF carrier level into the receiver and measure the distortion on the meter as shown in Figure 5-5. The High Alarm is set to 2.0 %.
  • Page 33 SINAD point. When the indicator bar turns green, the signal is close to 12 dB SINAD. Figure 5-6: Receiver Reference Sensitivity Measurement Enter the Reference Sensitivity (12 dB SINAD) reading on the MT-4E Test Sheet. If the distortion or reference sensitivity measurements are not within Codan published specifi cations, the RF Preselector may need re-alignment.
  • Page 34 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Audio Level: The audio level adjustment is not required when connecting the receiver in a repeater confi guration using LVDS Serial Data. The audio level adjustment can be done on both the Rx Balanced Audio Output and the Auxiliary Balanced Output (1 and 2).
  • Page 35 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Figure 5-9: Receiver Balanced (and Auxiliary) Audio Output Measurement To adjust the auxiliary balanced audio output, plug the AC-3E Control Card or CI-BC-4E Base Control Card into the subrack using an extender card and connect the Auxiliary Balanced audio output to the DVM input directly on the IFR 2975 (no external load is required as the internal 600 ohm load of the IFR 2975 is used).

  • Page 36: Receiver Digital Testing

    Figure 5-10: Receiver Digital Testing On the IFR 2975, recall Codan setup 2 (Rx_Dig) from your internal drive. Enter the correct RF frequency, and ensure that the MOD TYPE is set to P25 and it is set for the SPEECH test pattern (or optionally the 1011 test pattern).
  • Page 37 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Inject the correct NAC (and TGID if programmed) and ensure that the receiver is operating as shown in Figure 5-11. There are no specifi c measurements to make on this test, just verify that the receiver is operating.

  • Page 38: Receiver Bit Error Rate Testing

    Figure 5-12: Receiver Bit Error Rate Testing On the IFR 2975, recall Codan setup 3 (Rx_BER) from your internal drive. Enter the correct RF frequency, and ensure that the MOD TYPE is set to P25 and it is set for the STD 1011 test pattern (the 1011 test pattern will not operate correctly for this test) as shown in Figure 5-13.
  • Page 39 Figure 5-14: RSS Receiver Bit Error Rate Test Enter the Reference Sensitivity (5% BER) reading on the MT-4E Test Sheet. If the BER measurements are not within Codan published specifi cations, the RF Preselector may need re-alignment. Refer to the Receiver RF Preselector Alignment and Tuning section.

  • Page 40: Receiver Rf Preselector Alignment And Tuning

    fi lter (typically 5 - 7 MHz in a VHF or UHF 400 MHz receiver). The UHF 700 / 800 / 900 MHz receiver RF Preselector is Full Band and does not require any tuning. Connect the IFR 2975 and Codan Radio as shown in Figure 5-15. RF Preselector output from Receiver...
  • Page 41 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE On the IFR 2975, recall Codan setup 4 (Rx_PreTune) from your internal drive. Enter the correct RF frequency and ensure the receiver is turned on. In the “Trace” box on the right hand side of the screen click on the “Run”...

  • Page 42: Receiver Reference Oscillator Adjustment

    MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Receiver Reference Oscillator Adjustment Connect the IFR 2975 and Codan Radio as shown in Figure 5-18. Computer running RSS Synthesizer L.O. output from Receiver to ANT input on IFR 2975...
  • Page 43 IFR 2975 Figure 5-20: UHF 700 / 800 / 900 MHz Receiver Reference Oscillator Connection On the IFR 2975, recall Codan setup 5 (Rx_Ref) from your internal drive as shown in Figure 5-21. Figure 5-21: Receiver Reference Oscillator Measurement...
  • Page 44 Click on the “Program” button to program in the new Reference Oscillator softpot value. The high and low alarms are turned off . Figure 5-22: RSS Receiver Reference Oscillator Alignment Enter the L.O. Reference Oscillator Off set reading on the MT-4E Test Sheet. Page 36 Chapter 5: Codan Radio System Testing...

  • Page 45: Transmitter Testing

    Figure 5-23: Transmitter Analog Testing On the IFR 2975, recall Codan setup 6 (Tx_Ana) from your internal drive. Enter the correct RF frequency on the IFR 2975, set the MIC MODE switch on the front panel of the transmitter to Analog, and fl ip the other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
  • Page 46 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Audio Distortion: The distortion meter will read demodulated audio and give you a transmitter distortion reading as shown in Figure 5-24. The High Alarm is set to 3.0 %. Figure 5-24: Transmitter Distortion and Power Measurements Enter the Audio Distortion reading on the MT-4E Test Sheet.
  • Page 47 Connect the transmitter to the power amplifi er (if used) and measure the RF power output of the amplifi er. Do not exceed power amplifi er input levels. Enter the Amplifi er RF Power Output reading on the MT-4E Test Sheet. Chapter 5: Codan Radio System Testing Page 39...
  • Page 48 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Deviation Level: The deviation level adjustment is not required when connecting the transmitter in a repeater confi guration using LVDS Serial Data. The audio level / deviation level adjustment can be done on both the Tx Balanced Audio Input and the Auxiliary Balanced Input (1 and 2).
  • Page 49 Aux In 2) for deviation of +/- 1.5 KHz (narrowband) or +/-3.0 KHz (wideband). The high and low alarms are set at +/-1.4 KHz to +/- 1.6 KHz deviation. Enter the Auxiliary Deviation Level (if used) reading on the MT-4E Test Sheet. Chapter 5: Codan Radio System Testing Page 41...

  • Page 50: Transmitter Ctcss Testing

    External Input of the CTCSS tones from another device (such as a tone-remote adapter). Connect the IFR 2975 and Codan Radio as shown in Figure 5-28. The Tx Subtone input connection is only required when testing the External Input. If the internal programming is used to generate the CTCSS tone, disconnect the Tx Subtone input from the IFR 2975.
  • Page 51 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE FGEN1 (if used) is confi gured to inject a 100 Hz tone at -18.0 dBm (0.098 Vrms or 0.277 Vpp) into the Tx Subtone input as shown in Figure 5-29. If the internal programming is used to generate the CTCSS tone, FGEN1 is not used and the CTCSS tone is generated internally in the transmitter.
  • Page 52 5-30 until a deviation of +/- 0.35 KHz (narrowband) or +/-0.5 KHz (wideband) is measured on the IFR 2975. There are no high and low alarms. Figure 5-30: RSS Transmitter Subtone Deviation Level Adjustment Enter the CTCSS Encode Deviation level reading on the MT-4E Test Sheet. Page 44 Chapter 5: Codan Radio System Testing...

  • Page 53: Transmitter Digital Testing

    Figure 5-31: Transmitter Digital Testing On the IFR 2975, recall Codan setup 8 (Tx_Dig) from your internal drive. Enter the correct RF frequency on the IFR 2975, set the MIC MODE switch on the front panel of the transmitter to Digital and fl ip the other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
  • Page 54 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS FGEN1 is confi gured to inject a 1.0 KHz tone at -8.0 dBm (0.308 Vrms) into the transmitter balanced input. A continuous tone injected into the transmitter will be demodulated as a “fl uctuating” audio level and tone.

  • Page 55: Transmitter Modulation Fidelity Testing

    Figure 5-33: Transmitter Modulation Fidelity Testing On the IFR 2975, recall Codan setup 9 (Tx_ModFid) from your internal drive. Enter the correct RF frequency on the IFR 2975 and set the transmitter front panel switch to NORM. The MIC MODE switch on the front panel can be set to either Digital or Analog (this test does not make use of the front panel switch).
  • Page 56 The high alarm point is set at 5%. Figure 5-35: Transmitter Modulation Fidelity Measurement Enter the C4FM Modulation Fidelity reading on the MT-4E Test Sheet. Page 48 Chapter 5: Codan Radio System Testing...

  • Page 57: Transmitter Reference Oscillator Adjustment

    Figure 5-36: Transmitter Reference Oscillator Testing On the IFR 2975, recall Codan setup 10 (Tx_Ref) from your internal drive. Set the transmitter front panel switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS). The MIC MODE switch on the front panel can be set to either Digital or Analog (this test does not make use of the front panel switch).
  • Page 58 Reference Oscillator softpot value. The high and low alarms are turned off . Figure 5-38: Transmitter Reference Oscillator Measurement Enter the Carrier Reference Oscillator Off set reading on the MT-4E Test Sheet. Page 50 Chapter 5: Codan Radio System Testing...

  • Page 59: System Testing

    Figure 5-39: System Duplex Analog Testing On the IFR 2975, recall Codan setup 11 (Dup_Ana) from your internal drive as shown in Figure 5-40. Enter the correct RF frequencies for the receiver and transmitter and ensure that the deviation level of the 1.0 KHz tone is set correctly for your receiver (wide / narrow).
  • Page 60 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Ensure that the receiver and transmitter are connected to the repeater controller via the RJ45 cables on the front panel. In some systems, the receiver and transmitter may be connected directly together using the RJ45 cables.
  • Page 61 The low and high alarms are set for 1.40 KHz and 1.60 KHz. Figure 5-41: RSS Receiver or Transmitter Analog LVDS Level Adjustment Enter the Repeat Deviation Level reading on the MT-4E Test Sheet. Chapter 5: Codan Radio System Testing Page 53...

  • Page 62: Duplex Digital Testing

    Figure 5-42: System Duplex Digital Testing On the IFR 2975, recall Codan setup 12 (Dup_Dig) from your internal drive as shown in Figure 5-43. Enter the correct RF frequencies for the receiver and transmitter, select the MOD TYPE to P25 and set it for the SPEECH test pattern (or optionally the 1011 test pattern).
  • Page 63 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Ensure that the receiver and transmitter are connected to the repeater controller via the RJ45 cables on the front panel. In some systems, the receiver and transmitter may be connected directly together using the RJ45 cables.
  • Page 64 4. Click on the UPLINK window to open the full window. In the ES DATA portion of the window the KID will read 0000, the ALGID will read 81, and the MI data will be constantly changing. 5. Check the P25 Digital Repeat Capability Checked box on the MT-4E Test Sheet. Page 56...

  • Page 65: Chapter 6: Additional Radio System Tests

    CHAPTER 6: ADDITIONAL RADIO SYSTEM TESTS A number of additional radio system tests can be performed on the Codan MT-4E radio system at the radio site with the full radio system. In this chapter, testing of the radio system is typically done as an entire system with the antenna and fi...

  • Page 66: Radio System Testing Through Filtering Equipment

    MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS RA D I O S Y S T EM TE STING T HROU GH FILTERI NG E Q U I P M E N T The Transmitter RF power output and Receiver sensitivity tests can be performed by injecting and measuring the RF signals through the fi...

  • Page 67: Radio System Testing With The Antenna Connected

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE R A DI O S Y S T EM T E STIN G WITH THE ANTENNA C ONN E C T E D VSWR An antenna system VSWR test can be performed by connecting a Wattmeter such as the Bird Model 43 Wattmeter between the antenna port of the fi...

  • Page 68: Receiver Desense

    Figure 6-3: Receiver Desense Testing On the IFR 2975, recall Codan setup 1 (Rx_Ana) from your internal drive. Enter the correct RF frequency, select the MOD TYPE to FM and set it for a 1.0 KHz tone and ensure that the deviation level is set correctly for your receiver (wide / narrow).

  • Page 69: Rf Carrier Signal Levels On Links Between Sites

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE RF Carrier Signal Levels on Links between Sites When linking two radio systems together it is advantageous to test the RF signal strength between the linked sites. A carrier signal level test can be performed by keying up the transmitter that links to the radio site under test and measuring the RF carrier level at the receive antenna.

  • Page 70: Spurious Signals Over The Air

    MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Spurious Signals over the Air A spurious signal test can be performed by keying up the transmitter over the air and observing the spectrum using a Spectrum Analyzer with an antenna on the input port as shown in Figure 6-5.

  • Page 71: Chapter 7: Blank Worksheets

    MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE CHAPTER 7: BLANK WORKSHEETS Chapter 7: Blank Worksheets Page 63...
  • Page 72 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Page 64 Chapter 7: Blank Worksheets...
  • Page 73 MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE Chapter 7: Blank Worksheets Page 65...
  • Page 74 MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS This Page Intentionally Left Blank Page 66 Chapter 7: Blank Worksheets...
  • Page 76 Codan Communications 43 Erie Street, Victoria, BC Canada, V8V 1P8 www.codancomms.com LMRsales@codancomms.com Toll Free Canada and USA Phone: 1-800-664-4066 Fax: 1-877-750-0004 International Phone: 250-382-8268 Fax: 250-382-6139 ©2013 Codan Limited All Rights Reserved. MG-001-6-0-0 www.codancomms.com...

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