Appendix C: IFR 3920 Test Procedures - Maintenance Guide

Oct 29, 2026

Appendix C provides maintenance-oriented test procedures for MT-4E analog and P25 digital radio systems using the IFR 3920 service monitor by Aeroﬂex. It outlines how to tune, test, maintain, and service the MT-4E radios, including configuration upload workflows via USB or network, use of Radio Service Software (RSS), and detailed testing sections covering general setup, connections, regulator and voltage checks, receiver and transmitter analog/digital verification, and bit error rate and RF alignment activities. It also includes safety and warranty guidance and notes on modifiable procedures.

LanguageEnglish

CategoryExam

FormatPDF

Pages42

Reading Time1 h 46 min

AccessFree to download

Appendix C: IFR 3920 Test Procedures

MT-4E Testing with the IFR 3920 by Aeroﬂex

General Set-Up and Connections

Uploading Codan Configurations to the IFR 3920

Radio Service Software (RSS)

Control Cards

Adapters, Cables and Extender Cards

Codan MT-4E Radio System Test Sheet

Turning OFF the MT-4E Receiver and Transmitter Modules

Audio Connections

System Regulator Testing

System Voltage Testing

Receiver Testing

Receiver Analog Testing

Receiver Digital Testing

Receiver Bit Error Rate Testing

Receiver RF Preselector Alignment and Tuning

Receiver Reference Oscillator Adjustment

Transmitter Testing

Transmitter Analog Testing

Transmitter CTCSS Testing

Transmitter Digital Testing

System Testing

Duplex Analog Testing

Duplex Digital Testing

Appendix C: IFR 3920 Test Procedures MAINTENANCE GUIDE [www.codancomms.com](www.codancomms.com) MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS Contents Appendix C: IFR 3920 Test Procedures................................. 1 MT-4E Testing with the IFR 3920 by Aeroﬂex ............................................ 1 General Set-Up and Connections .............................................................. 2 Uploading Codan Conﬁgurations to the IFR 3920...........................................2 Radio Service Software (RSS) ........................................................................3 Control Cards ..................................................................................................3 Adapters, Cables and Extender Cards ............................................................3 Codan MT-4E Radio System Test Sheet .........................................................3 Turning OFF the MT-4E Receiver and Transmitter Modules ...........................4 Audio Connections ..........................................................................................5 System Regulator Testing .......................................................................... 6 System Voltage Testing ...................................................................................6 Receiver Testing......................................................................................... 7 Receiver Analog Testing ..................................................................................7 Receiver Digital Testing ................................................................................. 11 Receiver Bit Error Rate Testing .....................................................................13 Receiver RF Preselector Alignment and Tuning............................................15 Receiver Reference Oscillator Adjustment ....................................................17 Transmitter Testing................................................................................... 20 Transmitter Analog Testing ............................................................................20 Transmitter CTCSS Testing ...........................................................................26 Transmitter Digital Testing .............................................................................29 System Testing ......................................................................................... 33 Duplex Analog Testing ...................................................................................33 Duplex Digital Testing ....................................................................................36 Page i MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE APPENDIX C: IFR 3920 TEST PROCEDURES MT-4E TESTING WITH THE IFR 3920 BY AEROFLEX This Chapter contains instructions for Tuning, Testing, Maintaining and Servicing MT-4E Analog and P25 Digital Radio Systems with the IFR 3920 Service Monitor by Aeroﬂex. This Chapter is intended as an aid to conﬁguring and testing Codan MT-4E radios using the IFR 3920. 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 unauthorized 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. Refer to Codan Communications Instruction Manuals for complete radio s

FAQs

What is Appendix C intended to help with for MT-4E radios and the IFR 3920?

It provides instructions to tune, test, maintain, and service MT-4E analog and P25 digital radio systems using the IFR 3920 service monitor by Aeroﬂex.

How are Codan configuration files uploaded to the IFR 3920?

Configuration files can be uploaded from a USB flash drive to the test set via the USB port and file management utilities, or from a computer when the test set is connected to your network.

What kinds of tests does the chapter cover for receiver and transmitter performance?

Receiver testing includes analog, digital, bit error rate, and RF alignment and oscillator adjustment topics; transmitter testing includes analog, CTCSS, and digital testing sections.

Oct 29, 2026

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