Chapter 15
Using Cable and Antenna Analyzer
520
JD700B Series User’s Guide
Introduction
The Cable and Antenna Analyzer is a diagnostic tool needed to accurately detect operational problems by
performing cable and antenna measurements to verify the base station’s infrastructure, including feed lines,
connectors, antennas, cables, jumpers, amplifiers, and filters. The JD785B/JD745B Base Station Analyzer
and the JD786B/JD746B RF Analyzer have all of the measurement functions necessary to verify cable and
antenna systems from Voltage Standing Wave Ratio (VSWR) to power measurements. In addition, the
JD785B/JD745B and the JD786B/JD746B make distance-to-fault measurements to pinpoint a faulty location
accurately.
To get maximum power into a load it is required that the load impedance match the generator impedance.
Any difference in impedance or mismatching would not produce maximum power transfer. An impedance
mismatch at the antenna system produces a reflective ‘traveling wave’, which goes in the opposite direction
from the incident wave. As the two traveling waves cross each other in opposite direction, it is produce an
interference pattern called a "standing wave". VSWR is the ratio between the power sent forward to the
cable and/or antenna and the amount of power that is reflected back to the transmitter.
Some of the consequences of having a high VSWR condition in cellular services include dropped calls, poor
reception, and an overall unacceptable performance in the cell (or section of cell) covered by the base
station antenna. Therefore, the VSWR of the antenna system including the feed line is one of the most
critical factors in the service and maintenance of the RF transmitter systems.
This Cable and Antenna Analyzer function performs following measurements:
◼
Reflection: VSWR and Return Loss
◼
Distance to Fault (DTF): VSWR and Return Loss
◼
Reflection-DTF (dual measurement)
◼
2 Port Measurements: Vector and Scalar (Optional)
◼
Cable Loss (1 Port)
◼
1 Port Phase
◼
Smith Chart
Display overview
provides descriptions for each segment of the measurement screen.
Содержание CellAdvisor JD700B Series
Страница 2: ...CellAdvisorTM JD700B Series FW3 120 User s Guide ...
Страница 105: ...Chapter 4 Using Spectrum Analyzer 104 JD700B Series User s Guide Figure 44 PIM detection for multiple carriers ...
Страница 406: ...Chapter 11 Using EV DO Signal Analyzer JD700B Series User s Guide 405 3 Pilot 4 MAC 64 5 MAC 128 ...
Страница 734: ...Chapter 18 Perfroming BBU Emulation JD700B Series User s Guide 733 Figure 441 Example of verification of link status ...
Страница 763: ...Chapter 21 Performing Fiber Inspection 762 JD700B Series User s Guide Figure 461 Fiber inspection report ...
Страница 808: ...Appendix JD700B Series User s Guide 807 JD740B series ...
Страница 811: ...Appendix 810 JD700B Series User s Guide Figure 470 Append keywords window ...