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ZETRON Viavi CX300 Maintenance Manual

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Appendix H: Viavi CX300 Tests
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Appendix H:
Viavi CX300 Tests
MAINTENANCE GUIDE
www.zetron.com
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
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Summary of Contents for ZETRON Viavi CX300

  • Page 1 Appendix H: Viavi CX300 Tests ™ Appendix H: Viavi CX300 Tests MAINTENANCE GUIDE www.zetron.com MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS...

  • Page 2: Table Of Contents

    GENERAL SET-UP AND CONNECTIONS � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �02 Uploading Zetron Configurations to the CX300 � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � 02 Radio Service Software (RSS) �...

  • Page 3: Appendix H: Viavi Cx300 Tests

    Radio Systems with the CX300 ComXpert by Viavi. This Chapter is intended as an aid to configuring and testing Zetron MT-4E radios using the CX300. Neither Zetron or Viavi Solutions assume responsibility for damage caused to either unit as a result of misinterpretation or misuse of this procedure.

  • Page 4: General Set-Up And Connections

    To upload a file from a USB flash drive, insert the USB flash drive into one of the USB ports and select the Home button, then Files. Copy the Zetron folder from the USB flash drive to the /Disk/CX300/Internal folder. To recall setups while in the CX300 ComXpert test screen, go to the right hand side of the screen and select the file icon,...

  • Page 5: Radio Service Software (Rss)

    (RF frequency, wide / narrowband, digital / analog, CTCSS / NAC, etc.). Control Cards Some Zetron MT-4E radio systems may have an AC-3E Audio Control Card or CI-BC-4E Base 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 6: Turning Off The Mt-4E Receiver And Transmitter Modules

    RJ45 cables, rather than turning the front panel switch to the OFF position. All Zetron modules are hot swappable. There is no need to disconnect the power supply when inserting or removing the modules from the subrack.

  • Page 7: Audio Connections

    Appendix H: Viavi CX300 Tests Audio Connections The Receiver, Transmitter and Auxiliary Balanced audio lines are available for connection on Zetron 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 8: System Regulator Testing

    System Voltage Testing The first stage of testing a Zetron 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 9: Receiver Testing

    1.0 KHz tone is set correctly for your receiver (wide / narrow) in M1. Enter the correct CTCSS tone (if used) and deviation level for the tone in M2. On the Zetron Radio system, ensure the receiver is turned on and turn the System Regulator Speaker switch to ON and INT.
  • Page 10 Appendix H: Viavi CX300 Tests 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 H-4. The high limit is set to 2.0 %.
  • Page 11 Enter the Reference Sensitivity (12 dB SINAD) reading on the MT-4E Test Sheet. If the distortion or reference sensitivity measurements are not within Zetron published specifi cations, the RF Preselector may need re-alignment. Refer to the Receiver RF Preselector Alignment and Tuning section.
  • Page 12 Appendix H: Viavi CX300 Tests Audio Level: The audio level adjustment is not required when connecting the receiver in a repeater configuration 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 13: Receiver Digital / Ber Testing

    Figure H-7: Receiver Digital Testing On the CX300, load Zetron preset 02 Rx Digital from your internal drive. Enter the correct RF frequency, and ensure that the Mod Pattern is set for the Stored Speech test pattern (or optionally the 1011 test pattern).
  • Page 14 Enter the Reference Sensitivity (5% BER) reading on the MT-4E Test Sheet. If the BER measurements are not within Zetron published specifi cations, the RF Preselector may need re- alignment. Refer to the Receiver RF Preselector Alignment and Tuning section.

  • Page 15: Receiver Rf Preselector Alignment And Tuning

    filter (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 CX300 and Zetron Radio as shown in Figure H-10. RF Preselector output...
  • Page 16 Appendix H: Viavi CX300 Tests On the CX300, load Zetron preset 03 Rx Preselector Tune from your internal drive. Enter the correct RF frequency as the Center Freq and ensure the receiver is turned on. The filter waveform should appear as shown in Figure H-12�...

  • Page 17: Receiver Reference Oscillator Adjustment

    Appendix H: Viavi CX300 Tests Receiver Reference Oscillator Adjustment Connect the CX300 and Zetron Radio as shown in Figure H-13. Computer running RSS Synthesizer L.O. output from Receiver to RF INPUT on CX300 RECEIVER SYSTEM REGULATOR FUNCTION FREQUENCY (MHz) SQ. DISABLE...
  • Page 18 CX300 Figure H-15: UHF 700 / 800 / 900 MHz Receiver Reference Oscillator Connection On the CX300, load Zetron preset 04 Rx Reference from your internal drive as shown in Figure H-16. Figure H-16: Receiver Reference Oscillator Measurement MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS...
  • Page 19 Appendix H: Viavi CX300 Tests In the receiver RSS, enter the Service section and click on “Ref Oscillator”. The reference oscillator frequency is shown as the “Target Synthesizer RF OUT”. Enter this RF frequency into the frequency on the CX300. The receiver generates this frequency out of the Synthesizer into the CX300.

  • Page 20: Transmitter Testing

    Figure H-18: Transmitter Analog Testing On the CX300 load Zetron preset 05 Tx Analog from your internal drive. Enter the correct RF frequency on the CX300, set the MIC MODE switch on the front panel of the transmitter to Analog, and flip the other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
  • Page 21 Appendix H: Viavi CX300 Tests Audio Distortion: The distortion meter will read demodulated audio and give you a transmitter distortion reading as shown in Figure H-19. The high limit is set to 3.0 %. Figure H-19: Tx Distortion and Power Measurements Enter the Audio Distortion reading on the MT-4E Test Sheet.
  • Page 22 Connect the transmitter to the power amplifier (if used) and measure the RF power output of the amplifier. The Zetron 30 Watt Amplifier’s RF power output can be changed by adjusting the transmitter (exciter) RF power output. Do not exceed power amplifi er input levels. Higher power amplifi ers typically have a fixed RF power input level and RF power output level.
  • Page 23 Appendix H: Viavi CX300 Tests Deviation Level: The deviation level adjustment is not required when connecting the transmitter in a repeater configuration 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 24 Appendix H: Viavi CX300 Tests In the Deviation Levels area of the Service section on the RSS, click on the “Key Tx” button and adjust the Tx Balanced Audio Input level adjustment as shown in Figure H-22 until a deviation of +/- 1.5 KHz (narrowband) or +/-3.0 KHz (wideband) is measured on the CX300.
  • Page 25 Appendix H: Viavi CX300 Tests Reference Oscillator Adjustment In the transmitter RSS, enter the Service section and click on “Ref Oscillator”. The reference oscillator frequency is shown as the “Target Frequency”. Enter this RF frequency into the CX300. Click on the “Key Tx” button and the transmitter will generate the reference frequency out of the RF output into the CX300.

  • Page 26: Transmitter Ctcss Testing

    Figure H-24: Transmitter CTCSS Testing On the CX300, load Zetron preset 06 Tx CTCSS from your internal drive. Enter the correct RF frequency on the CX300, set the MIC MODE switch on the front panel of the transmitter to Analog and flip the other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
  • Page 27 Appendix H: Viavi CX300 Tests AF Generator A2 (if used) is configured to inject a 100 Hz tone at -18.0 dBm (0.098 Vrms) into the Tx Subtone input as shown in Figure H-25. If the internal programming is used to generate the CTCSS tone, the AF generator is not used and the CTCSS tone is generated internally in the transmitter.
  • Page 28 Appendix H: Viavi CX300 Tests In the Subtone Levels area of the Service section on the RSS, click on the “Key Tx” button and adjust the Narrow and/or Wide Internal and/or External Subtone Deviation level adjustment as shown in Figure H-26 until a deviation of +/- 0.35 KHz (narrowband) or +/-0.5 KHz (wideband) is measured on the CX300.

  • Page 29: Transmitter Digital Testing

    Figure H-27: Transmitter Digital Testing On the CX300, load Zetron preset 07 Tx Digital from your internal drive. Enter the correct RF frequency on the CX300, set the MIC MODE switch on the front panel of the transmitter to Digital and flip the other switch to KEY TX (or set the switch to NORM and key the transmitter through the RSS).
  • Page 30 Appendix H: Viavi CX300 Tests AF Gen 1 is configured to inject a 1.0 KHz tone at -8.0 dBm (0.308 Vrms) into the transmitter balanced input, however the CX300 does not demodulate the P25 signal. Ensure the correct NAC is being transmitted properly as shown in Figure H-28. The NAC is programmed into the transmitter via the RSS.
  • Page 31 Appendix H: Viavi CX300 Tests Modulation Fidelity Testing In the transmitter RSS, enter the Service section and click on “Test Patterns”. Ensure the transmitter frequency is in the frequency box. In the Select Pattern window select “C4FM Modulation Fidelity”. Click on the “Key Tx”...

  • Page 32: System Testing

    Figure H-31: System Duplex Analog Testing On the CX300, load Zetron preset 08 Duplex Analog from your internal drive as shown in Figure H-32. Enter the correct RF frequency 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) in M1.
  • Page 33 Appendix H: Viavi CX300 Tests 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 34 Appendix H: Viavi CX300 Tests Deviation Level: Check the deviation level. Ideally the deviation level out of the transmitter should match the input to the receiver. The repeater deviation level matching is adjusted by the analog LVDS level adjustment that is available in both the receiver and transmitter (only one needs to be adjusted).

  • Page 35: Duplex Digital Testing

    Figure H-34: System Duplex Digital Testing On the CX300, load Zetron preset 09 Duplex Digital from your internal drive as shown in Figure H-35. Enter the correct RF frequencies for the receiver and transmitter, and ensure that the Pattern is set for 1011 and inject the correct NAC for the receiver.
  • Page 36 Appendix H: Viavi CX300 Tests 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 37 Appendix H: Viavi CX300 Tests This Page Intentionally Left Blank. MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS...
  • Page 38 E: uk@zetron.com ©Zetron, Inc. All rights reserved. Zetron® and Zetron and Design® are registered trademarks of Zetron, Inc. All other trademarks are properties of their respective owners. See Zetron price list for option pricing. Specifications subject to change without notice.

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