MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics

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24 Chapter 5: Daniels Radio System Testing 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 5-5. The High Alarm is set to 2.0 %. Figure 5-5: Receiver Distortion Measurement Enter the Audio Distortion reading on the MT-4E Test Sheet. Maintenance Guide MG-001 Daniels MT-4E Radio Systems www.danelec.com
Chapter 5: Daniels Radio System Testing 25 Reference Sensitivity: Monitor the SINAD meter while slowly reducing the RF carrier level as shown in Figure 5-6. The 12 dB SINAD point should be at an RF carrier level less than the specifi ed Analog Sensitivity point of the receiver. The high and low alarms are set for 11.5 and 12.5 dB SINAD to help you locate the 12 dB SINAD point. When the indicator bar turns green, the signal is close to 12 dB SINAD. Figure 5-6: Receiver Reference Sensitivity Measurement Enter the Reference Sensitivity (12 dB SINAD) reading on the MT-4E Test Sheet. If the distortion or reference sensitivity measurements are not within Daniels published specifi cations, the RF Preselector may need re-alignment. Refer to the Receiver RF Preselector Alignment and Tuning section. Squelch: Adjust the RF carrier level up and down until the receiver squelches and unsquelches. There should be approximately 6.0 dBm of hysteresis between the squelch and unsquelch points. The squelch point can be adjusted in the Squelch Levels area of the Service section on the RSS. The Receiver operates on a Noise based squelch (default) or a Received Signal Strength based squelch (optional). The squelch can be set globally for all channels, or on a per channel basis. To set the squelch Open and Close points, inject an RF signal at the desired Open or Close level and click the Set button. Enter the Squelch and Unsquelch readings on the MT-4E Test Sheet. MG-001 Daniels MT-4E Radio Systems www.danelec.com Maintenance Guide
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MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics

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