Anritsu S251C manual Two Port Measurements, Introduction

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Chapter 4 Measurements

Two Port Measurements

Introduction

A Tower Mounted Amplifier (TMA) can be used to amplify the received signal. There are different types of TMA depending on the system requirements. Three commonly used types are:

TMA-DA duplex tower mounted amplifier that combines transmit and receive ports from the radio system and connects to a single antenna. This configuration is specific to systems that use a single antenna configuration.

TMA-SA receive-only tower mounted amplifier is installed between the receiving antenna and the radio to boost weak signals. This configuration is common on sys- tems that implement separate antennas for transmitting and receiving.

TMA-DDA dual-duplex tower mounted amplifier used for radios systems with a single transmission line connection for transmit and receive. These systems are com- monly called transceivers.

TMA-D

TMA-STMA-DD

TX ANT RX

			(Bias Tee)
			(Bias Tee)


S251C		S251C
S251C		S251C
RF OUT		RF IN		ANT		RX		ANT	RX/TX

(Bias Tee)

(Bias Tee)

S251C	S251C	S251C	S251C
RF OUT	RF IN	RF OUT	RF IN

Figure 4-7. Types of Tower Mounted Amplifiers

During installation of the TMA, the following tests should be conducted:

Antenna Subsystem Return Loss Testing to verify antenna performance.

TMA performance testing to verify the tower mounted amplifier performance.

Insertion Loss Measurement Test to verify the transmission line performance before TMA installation and connecting the antenna.

When troubleshooting TMA problems, the following test should be conducted:

Insertion Loss Measurement Test to verify the transmission line performance after TMA insertion.

DTF-Return Loss with the TMA removed from the configuration.

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Contents Site Master Model S251C Antenna Cable Analyzer Page Warranty Page Table of Contents Cable & Antenna Analysis Iii/iv Standard Accessories IntroductionDescription Options Optional AccessoriesPerformance Specifications Description Site Master Performance Specifications 2 ESD Precautions Preventive MaintenanceAnnual Verification Anritsu Service Centers Chapter Functions and Operations Test Connector PanelActive Function Block Soft Keys Front Panel OverviewMode Function Hard KeysClear Keypad Hard KeysAuto MODE=FREQ FREQ/DIST Softkeys Soft KeysMODE=DTF FREQ/DIST Softkeys Functions and Operations Amplitude MODE=POWER Monitor Softkeys Power Monitor Menu OptionMODE=RF Source Softkeys RF Source MenuLimit Segment 1 Segment SYS Self Test SymbolsSelf Test Errors Error CodesERRORD2 Range ErrorsCharging a New Battery Battery InformationCharging the Battery in the Site Master Charging the Battery in the Optional ChargerBattery Life Battery Charge IndicatorImportant Battery Information Chapter Getting Started Power On ProcedureCalibration Select the Frequency or DistanceCalibration Calibration Procedure Single PortRF in Test Port RF OUT Test Port Calibration Procedure Dual PortSetting the Scale Save and Recall a SetupSave and Recall a Display Recalling a Display Set the Distance and Cable Type Changing the UnitsChanging the Display Language Printing a Screen PrintingPrinter Printer Switch SettingsUsing the Site Master Soft Carrying Case Using the Soft Carrying CaseLine Sweep Fundamentals One Port MeasurementsMeasurements Information Required for a Line SweepSystem Return Loss Measurement Typical Line Sweep Test Procedures2is an example of a typical system return loss trace Insertion Loss Measurement Procedure Cable Loss ModeType Attenuation dB/ft Length ft = Loss dB Procedure Return Loss Mode Procedure DTF-Return Loss Mode Distance-To-Fault DTF Transmission Line TestProcedure DTF-SWR Mode Antenna Subsystem Return Loss Test Vswr Introduction Two Port MeasurementsTMA-S TMA MeasurementsTMA Gain Measurement After Calibration TMA-DD 12. TMA-DD Gain Measurement TMA-D 14. TMA-D Gain Measurement 15. System Isolation Antenna to Antenna IsolationAntenna-to-Antenna Isolation Measurement Quency settings for common systems21/4-22 System Requirements FeaturesCommunication Port Setting InstallationUsing Software Tools Interface Cable InstallationDownloading Traces from the Site Master Plot Properties Plot CaptureSaving Traces Trace Overlay or Plot OverlaySaving a Plot to a Spreadsheet Custom Cable ListPrinting Formats Creating a DatabaseAppendix a Reference Data Coaxial Cable Technical DataAppendix a Reference Data A-4 Examples Appendix B WindowingAppendix B Windowing B-4