Chapter 5
Spectrum Analyzer
Measurements
Introduction
This chapter provides a description of field measurements available when the Model S114C or S332C Site Master is in Spectrum Analyzer mode.
Occupied Bandwidth
A common measurement performed on radio transmitters is that of occupied bandwidth (OBW). This measurement calculates the bandwidth containing the total integrated power occupied in a given signal bandwidth. There are two different methods of calculation de- pending on the technique to modulate the carrier.
99% Method — The occupied frequency bandwidth is calculated as the bandwidth containing 99% of the transmitted power.
X dB Down Method — The occupied frequency bandwidth is defined as the band- width between the upper and lower frequency points at which the signal level is X dB below the peak carrier level.
Required Equipment
Site Master Model S114C or S332C
30 dB, 50 Watt,
Test Port extension cable, Anritsu 15NNF50 – 1.5C
Procedure |
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Step 1. Using the test port extension cable and 30 dB attenuator connect the Site Master |
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| to the RF_Out test port. |
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Step 2. | Press the ON/OFF key on the Site Master. |
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Step 3. Press the MODE key. |
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Step 4. Use the Up/Down arrow key to select the Spectrum Analyzer mode and press |
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| ENTER. |
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Step 5. Enter the center frequency of the measurement. |
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Step 6. Select the appropriate frequency span, reference level, input attenuation level, |
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| resolution bandwidth, and video bandwidth. |
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Step 7. | Press the MEAS key. |
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Step 8. | Press the OBW soft key. |
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Step 9. | Select measurement method, % or dBc down by pressing the corresponding soft |
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| key and press ENTER. |
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