Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Manual de usuario descargar pdf (Pagina 39)

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

Chapter 5: Codan Radio System Testing Page 31

In the receiver RSS, enter the Service section and click on “Bit Error Rate”. The receiver frequency

should automatically be shown in the frequency box. Select the Test Type to “Continuous” and Average

Frames to “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 5-14. The

5% BER point should be at an RF carrier level less than the speciﬁ ed Digital Sensitivity point of the

receiver.

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.

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Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Manual de usuario Pagina 39