Installation Manual Part 5

PRELIMINARY
D-7
BWX 8415 Basestation Installation and Commissioning Guide
OL-19519-01
Appendix D RF Center Frequency and Interference Analysis Guidelines
Spectrum Analyzer Settings
Figure D-6 100KHz Bandwidth Setting
Time Domain Test
The Time Domain test (Figure D-7) is a measurement of the duration of an incoming signal across a
given bandwidth. The duration of an incoming signal affects the number of packet errors that are
generated over a given period of time. The longer the duration of the signal the more packet errors are
generated. The number of packet errors will directly affect the data throughput rates of the system.
Setups for the Spectrum Analyzer are as follows:
• Frequency = center frequency to be tested
• Span = 0 Hz
• Video Bandwidth = 1 MHz
• Resolution Bandwidth = 1 MHz or 5 MHz
• Sweep Time = 40 ms and 400 ms
• Preamp if available = on
• Attenuation = 0 dB
• Reference Level = -40 dB
The following is a description of the parameters of the Spectrum Analyzer during the Time Domain test
versus the Frequency Domain test, and what effects they will have if they are changed for the testing.
Span
The span function in the Frequency Domain test determines the start and stop range that the Spectrum
Analyzer looks at for a given sweep time. By setting the Span to 0 Hz for the Time Domain test the
Spectrum Analyzer looks at one specific frequency for a given amount of time.