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Appendix H: Viavi CX300 Tests

MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS

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).

In the receiver or transmitter RSS, enter the Service section and click on “LVDS Level”. A default value of 100

on the softpot slider should be close to matching receiver and transmitter deviation levels, however minor

adjustments can be made. Adjust the softpot slider in the RSS as shown in Figure H-33 until a deviation of +/- 1.5

KHz (narrowband) or +/- 3.0 KHz (wideband) is measured on the CX300. The low and high limits are set for 1.40

KHz and 1.60 KHz.

Figure H-33: RSS Receiver or Transmitter
Analog LVDS Level Adjustment

Enter the Repeat Deviation Level reading on the MT-4E Test Sheet.

Содержание Viavi CX300

Страница 1: ...i Appendix H Viavi CX300 Tests MAINTENANCE GUIDE MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS Appendix H Viavi CX300 Tests MAINTENANCE GUIDE www zetron com...

Страница 2: ...n MT 4E Radio System Test Sheet 03 Turning OFF the MT 4E Receiver and Transmitter Modules 04 Audio Connections 05 SYSTEM REGULATOR TESTING 06 System Voltage Testing 06 RECEIVER TESTING 07 Receiver Ana...

Страница 3: ...esult of misinterpretation or misuse of this procedure Zetron manufactured products are warranted against defective materials and workmanship This warranty does not extend to damage due to misuse negl...

Страница 4: ...he USB ash drive into one of the USB ports and select the Home button then Files Copy the Zetron folder from the USB ash drive to the Disk CX300 Internal folder To recall setups while in the CX300 Com...

Страница 5: ...Card remove the control card from the rack for the individual receiver and transmitter tests unless otherwise noted Adapters Cables and Extender Cards Various adapters cables and extender cards are re...

Страница 6: ...hen the MT 4E receiver and transmitter channel and bank select lines are connected together in parallel turning the MT 4E receiver or transmitter front panel switch to the OFF position will cause the...

Страница 7: ...h clip on type clips Recommended Test Points are Audio Control Card and Base Control Card Extender Card pins EC 96D1 and EC 96K 1 22 Auxiliary 1 Audio Output B11 and A11 Auxiliary 2 Audio Output C1 an...

Страница 8: ...c d c a c d c a c d c a c d c a c d c a c d c a F F mA S nS n A A mA mA mV mV V V mV mV V V OFF OFF C C A A A A AA M O C M O C VV TEMPERATURE TEMPERATURE A mA m AA AutoHOLD LOGGING SAVE FAST MN MX SE...

Страница 9: ...tion 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 Set the FUNCTION rotary switch to position 3 for Rx...

Страница 10: ...Figure H 4 Receiver Distortion Measurement 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...

Страница 11: ...r reference sensitivity measurements are not within Zetron published speci cations the RF Preselector may need re alignment Refer to the Receiver RF Preselector Alignment and Tuning section Squelch Ad...

Страница 12: ...ohms is measured on the AF Level meter of the CX300 as shown in Figure H 4 Figure H 6 RSS Receiver Audio Level Adjustment To adjust the auxiliary balanced audio output plug the AC 3E Control Card or...

Страница 13: ...the 1011 test pattern Inject the correct NAC as shown in Figure H 8 and ensure that the receiver is operating There are no speci c measurements to make on this test just verify that the receiver is o...

Страница 14: ...8 Click on the Start Test button to start the BER test You should get 0 BER at the 70 dBm default RF carrier level Monitor the BER reading while slowly reducing the RF carrier level as shown in Figure...

Страница 15: ...n in Figure H 10 Figure H 10 Receiver RF Preselector Tuning The RF Preselector output is a small RF cable internal in the receiver that terminates in an SMB connector The SMB plugs into J3 on the Rece...

Страница 16: ...e correct RF frequency as the Center Freq and ensure the receiver is turned on The lter waveform should appear as shown in Figure H 12 Figure H 12 Receiver RF Preselector To tune the RF Preselector lt...

Страница 17: ...s mounted on the Synthesizer beneath the RF Preselector The SMB BNC adapter is required to connect this point to the RF INPUT on the CX300 as shown in Figures H 14 VHF and UHF 400 MHz Receiver and H 1...

Страница 18: ...MS 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 Refere...

Страница 19: ...r RF OUT Enter this RF frequency into the frequency on the CX300 The receiver generates this frequency out of the Synthesizer into the CX300 Monitor the RF Error on the CX300 To change the reference f...

Страница 20: ...g and ip the other switch to KEY TX or set the switch to NORM and key the transmitter through the RSS The AF Generator A1 is con gured to inject a 1 0 KHz tone at 8 0 dBm 0 308 Vrms into the transmitt...

Страница 21: ...SYSTEMS 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 a...

Страница 22: ...r output will vary slightly with the 10 17 Vdc input Figure H 20 RSS Transmitter Power Level Adjustment Enter the RF Power Output reading on the MT 4E Test Sheet Connect the transmitter to the power a...

Страница 23: ...rd or CI BC 4E Base Control Card Change the Audio Filter near the top left corner from 0 3 3 4 KHz BP to 15KHz LP as shown in Figure H 21 for a more accurate deviation reading without CTCSS encode If...

Страница 24: ...d The MT 4E Transmitter will transmit a maximum deviation at an audio frequency of approximately 1300 Hz Enter the Transmitter Maximum Deviation Level reading on the MT 4E Test Sheet To adjust the aux...

Страница 25: ...Key Tx button and the transmitter will generate the reference frequency out of the RF output into the CX300 Monitor the RF Error on the CX300 To change the reference frequency adjust the softpot slid...

Страница 26: ...from the CX300 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 fro...

Страница 27: ...gured 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...

Страница 28: ...on 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...

Страница 29: ...IC MODE switch on the front panel of the transmitter to Digital and ip the other switch to KEY TX or set the switch to NORM and key the transmitter through the RSS Computer running RSS Tx Balanced Aud...

Страница 30: ...nto 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 tran...

Страница 31: ...n as shown in Figure H 29 and the transmitter will begin generating the test pattern out the RF output Figure H 29 RSS Transmitter Modulation Fidelity Test Pattern Measure the Modulation Fidelity of t...

Страница 32: ...ansmitter front panel switch to NORM The MIC MODE switch on the transmitter front panel can be set to either Digital or Analog this test does not make use of the front panel switch TRANSMITTER BUS CNT...

Страница 33: ...sing the RJ45 cables Figure H 32 System Analog Duplex Measurement Distortion The distortion meter will read demodulated audio and give you a complete repeater system distortion reading The high limit...

Страница 34: ...djusted In the receiver or transmitter RSS enter the Service section and click on LVDS Level A default value of 100 on the softpot slider should be close to matching receiver and transmitter deviation...

Страница 35: ...tch on the transmitter front panel can be set to either Digital or Analog this test does not make use of the front panel switch TRANSMITTER BUS CNTL MIC RF OUT A D DIGITAL OFF NORM KEY ANALOG TX MICMO...

Страница 36: ...l In some systems the receiver and transmitter may be connected directly together using the RJ45 cables Figure H 35 System Digital Duplex Check There are no speci c measurements to make on this test j...

Страница 37: ...35 Appendix H Viavi CX300 Tests MAINTENANCE GUIDE MT 4E ANALOG P25 DIGITAL RADIO SYSTEMS This Page Intentionally Left Blank...

Страница 38: ...ist for option pricing Specifications subject to change without notice ZETRON EMEA 27 29 Campbell Court Bramley Hampshire RG26 5EG United Kingdom P 44 1256 880663 F 44 1256 880491 E uk zetron com ZETR...

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