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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.
Percent of Power Method
The occupied frequency bandwidth is calculated as the bandwidth containing the specified
percentage of the transmitted power.
XdB Down Method
The occupied frequency bandwidth is defined as the bandwidth between the upper and
lower frequency points at which the signal level is
XdB below the peak carrier level.
Required Equipment
r
Site Master S114C/S332C
r
30 dB, 50 watt, Bi-Directional, DC – 18 GHz, N(m) – N(f), Attenuator,
Anritsu 42N50A-30
r
Test Port extension cable, Anritsu 15NNF50 – 1.5C
Procedure
Step 1. Reset the Site Master to the factory default settings if a known starting state is
desired.
If the unit is off, hold down the ESC/CLEAR key while pressing the ON/OFF
key.
If the unit is already on, press the RECALL SETUP key on the data keypad.
When the key is pressed, a Recall Trace selection box appears on the display.
Select setup location 0 to recall the factory preset state.
Step 2. Using the test port extension cable and 30 dB, 50 watt, Bi-directional attenuator,
connect the Site Master to appropriate transmit test port.
Step 3.
If the Site Master is not currently in Spectrum Analyzer mode, press the MODE
key, scroll to
SPECTRUM ANALYZER mode, and press ENTER.
Step 4.
Press the FREQ/DIST key, select the
CENTER soft key and enter the center fre-
quency of the measurement using the keypad. Select the
GHz, MHz, kHz,orHz
softkey to accept the center frequency input.
Step 5.
Press the AMPLITUDE key and select the
REF LEVEL soft key to set the appro-
priate reference level. See the table below for recommended settings for CW and
CDMA signals.
Step 6. Select the
ATTEN soft key to set the input attenuation level. See the table below
for recommended settings for CW and CDMA signals.
Step 7.
Press the SWEEP key and select the
RBW and VBW soft keys to set the resolu-
tion bandwidth and video bandwidth. See the table below for recommended set
-
tings for CW and CDMA signals.
5-10
Chapter 5 Spectrum Analyzer Measurements
- Site Master 1
- S113C, S114C 1
- S331C, and S332C 1
- Antenna, Cable and 1
- Spectrum Analyzer 1
- WARRANTY 3
- LIMITATION OF WARRANTY 3
- TRADEMARK ACKNOWLEDGMENTS 3
- Table of Contents 5
- Chapter 3 - Getting Started 6
- Chapter 6 - Power Measurement 8
- Chapter 7 - Software Tools 8
- Appendix A - Reference Data 8
- Appendix B - Windowing 8
- Chapter 1 9
- General Information 9
- Printers 10
- Optional Accessories 11
- Performance Specifications 12
- Chapter 1 General Information 13
- Preventive Maintenance 14
- Calibration 14
- Annual Verification 15
- ESD Precautions 15
- Chapter 2 17
- Functions and Operations 17
- Front Panel Overview 18
- Function Hard Keys 19
- Keypad Hard Keys 20
- Soft Keys 22
- MODE=DTF: 23
- SOFTKEYS: 23
- FREQ/DIST 23
- AMPLITUDE 23
- MODE=SPECTRUM ANALYZER: 24
- Power Monitor Menu 34
- Self Test 35
- Error Codes 35
- Description 36
- Self Test Error Messages 36
- Range Errors 37
- InstaCal Error Messages 38
- Battery Information 40
- BATTERY INDI 41
- Battery Life 42
- 2-27/2-28 43
- Chapter 3 44
- Getting Started 44
- Site Master Mode 45
- Calibration Verification 46
- Figure 3-2. Calibration Setup 47
- InstaCal Module Verification 48
- Site Master S332C 49
- Setting the Scale 50
- Auto Scale 50
- Amplitude Scale 50
- Spectrum Analyzer Mode 52
- Selecting Sweep Parameters 53
- Adjusting Attenuator Settings 54
- Save and Recall a Setup 55
- Save and Recall a Display 55
- Changing the Units 56
- Changing the Display Language 56
- Adjusting Markers 56
- Adjusting Limits 56
- Setting the System Language 58
- Setting the System Impedance 58
- Printing 59
- Printer Switch Settings 60
- Using the Soft Carrying Case 61
- Chapter 4 62
- Cable & Antenna 62
- Measurements 62
- MODE key 64
- Insertion Loss Measurement 65
- ´ Length (ft) = Loss (dB) 66
- Resolution 70
- MARKER key 71
- 4-11/4-12 72
- Chapter 5 73
- AUTO mode, as the 74
- MANUAL) mode, the 74
- AM/FM Modulation 75
- Frequency Modulation 76
- Field Strength Measurements 78
- Creating a Spectral Mask 79
- EDIT and enter the 80
- EDIT when done 80
- Trace Overlay 81
- Occupied Bandwidth 82
- Channel Power Measurement 84
- GSM Channel Power Measurement 84
- Procedure 85
- Adjacent Channel Power Ratio 87
- Measurement Applications 89
- OUT OF BANDOUT OF BAND 95
- In-band Spurious Measurement 97
- Required Equipment 97
- Field Strength 99
- Antenna Calculations 100
- 5-29/5-30 101
- Power Measurement 102
- Chapter 6 102
- Chapter 7 104
- Software Tools 104
- Installation 105
- Using Software Tools 106
- Plot Capture to the PC 107
- Plot Upload to the Instrument 107
- Plot Properties 107
- Trace Overlay or Plot Overlay 108
- Saving Traces 109
- Creating a Database 110
- Printing Formats 110
- Uploading Antenna Factors 111
- 7-9/7-10 112
- Appendix A 113
- Reference Data 113
- Appendix A Reference Data 114
- Appendix B 116
- Windowing 116
- Appendix B Windowing 117
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