Codan MT-3 Technical Note
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Codan MT-3 Technical Note

Codan MT-3 Technical Note

Test procedures with ifr com-120 by aeroflex
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IFR COM-120 by Aerofl ex
Technical Note for Tuning, Testing,
with the IFR COM-120 (B or C) by Aerofl ex
Codan Radio Communications
43 Erie Street
Victoria, British Columbia
Canada V8V 1P8
International
Phone:
250-382-8268
Fax:
250-382-6139
Email:
LMRsales@codanradio.com
Web:
www.codanradio.com
Toll Free Canada and U.S.A.
Phone:
1-800-664-4066
Fax:
1-877-750-0004
TN910
Codan MT-3 and
Test Procedures
Maintaining and Servicing
MT-3 FM Analog Radio Systems

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Summary of Contents for Codan MT-3

  • Page 1 Codan MT-3 and IFR COM-120 by Aerofl ex Test Procedures Technical Note for Tuning, Testing, Maintaining and Servicing MT-3 FM Analog Radio Systems with the IFR COM-120 (B or C) by Aerofl ex Codan Radio Communications 43 Erie Street Victoria, British Columbia...

  • Page 2: Table Of Contents

    Important Information This Technical Note is intended as an aid to confi guring and testing Codan radios using an IFR COM-120 (B or C) Service Monitor by Aerofl ex. 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 3: General Set-Up And Connections

    (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.

  • Page 4: System Regulator Testing System Voltage Testing

    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 in to the front panel.

  • Page 5: Receiver Testing

    (±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.

  • Page 6: Distortion

    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 Confi guration If the Distortion or SINAD measurements are not within Codan published specifi cations, the Front End may need re-alignment. Refer to the Receiver Front End Alignment and Tuning section.

  • Page 7: Receiver And Auxiliary (Ac-3E) Output Audio Levels

    TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures 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.

  • Page 8: Ctcss Decode

    TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures 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.

  • Page 9: Receiver Front End Alignment And Tuning

    RF frequency is changed beyond the band pass of the fi lter (typically 5 - 7 MHz). Connect the IFR COM-120 and Codan radio as as shown in Figure 8: Front End output from Receiver...

  • Page 10: Transmitter Testing

    TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures Transmitter Testing Connect the IFR COM-120 and Codan radio as shown in Figure 10: DIGITAL MULTIMETER Optional External DVM AutoHOLD FAST MN MX LOGGING HOLD HOLD MIN MAX...
  • Page 11 TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures To set the IFR COM-120 receive audio fi lters, highlight LINE and select CONFIG as shown in Figure 12. Set up the fi lters as shown in Figure 13. Hit RETURN to return to the RECEIVE window.

  • Page 12: Distortion

    Connect the transmitter to the power amplifi er (if used) and measure the RF power output of the amplifi er. The Codan 30 Watt Amplifi er’s RF power output can be changed by adjusting the transmitter (exciter) RF power output.

  • Page 13: Auxiliary (Ac-3E) Input Audio Levels

    TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures 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.

  • Page 14: Duplex Testing

    TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures Duplex Testing Connect the IFR COM-120 and Codan radio as shown in Figure 17: MODE DATA ENTRY ANTENNA AUDIO TRANSMITTER RECEIVER SYSTEM REGULATOR CONTROL FREQUENCY (MHz) FUNCTION...

  • Page 15: Distortion

    TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures 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.
  • Page 16 TECHNICAL NOTES MT-3 Radio Systems TN910 Codan MT-3 and IFR COM-120 Test Procedures This Page Intentionally Left Blank 43 Erie Street International Toll Free Canada & U.S.A. Internet Victoria, B.C. Phone: 250-382-8268 Phone: 1-800-664-4066 Email: LMRsales@codanradio.com Canada V8V 1P8 Fax:...

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