Two Port Measurements, Introduction | Anritsu S251C specification

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.

4-12

Image 57

Anritsu S251C manual Two Port Measurements, Introduction

Contents

Site Master Model S251C Antenna Cable Analyzer Page Warranty Page Table of Contents Cable & Antenna Analysis Iii/iv Standard Accessories IntroductionDescription Options Optional Accessories Performance Specifications Description Site Master Performance Specifications 2 ESD Precautions Preventive Maintenance Annual Verification Anritsu Service Centers Chapter Functions and Operations Test Connector Panel Active Function Block Soft Keys Front Panel Overview Mode Function Hard Keys Clear Keypad Hard Keys Auto MODE=FREQ FREQ/DIST Softkeys Soft Keys MODE=DTF FREQ/DIST Softkeys Functions and Operations Amplitude MODE=POWER Monitor Softkeys Power Monitor Menu Option MODE=RF Source Softkeys RF Source Menu Limit Segment 1 Segment SYS Self Test Symbols Self Test Errors Error Codes ERRORD2 Range Errors Charging a New Battery Battery InformationCharging the Battery in the Site Master Charging the Battery in the Optional Charger Battery Life Battery Charge Indicator Important Battery Information Chapter Getting Started Power On Procedure Calibration Select the Frequency or Distance Calibration Calibration Procedure Single Port RF in Test Port RF OUT Test Port Calibration Procedure Dual Port Setting 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 Printing Printer Printer Switch Settings Using the Site Master Soft Carrying Case Using the Soft Carrying Case Line Sweep Fundamentals One Port Measurements Measurements Information Required for a Line Sweep System Return Loss Measurement Typical Line Sweep Test Procedures 2is an example of a typical system return loss trace Insertion Loss Measurement Procedure Cable Loss Mode Type Attenuation dB/ft Length ft = Loss dB Procedure Return Loss Mode Procedure DTF-Return Loss Mode Distance-To-Fault DTF Transmission Line Test Procedure DTF-SWR Mode Antenna Subsystem Return Loss Test Vswr Introduction Two Port Measurements TMA-S TMA Measurements TMA Gain Measurement After Calibration TMA-DD 12. TMA-DD Gain Measurement TMA-D 14. TMA-D Gain Measurement 15. System Isolation Antenna to Antenna Isolation Antenna-to-Antenna Isolation Measurement Quency settings for common systems 21/4-22 System Requirements Features Communication Port Setting Installation Using Software Tools Interface Cable InstallationDownloading Traces from the Site Master Plot Properties Plot Capture Saving Traces Trace Overlay or Plot Overlay Saving a Plot to a Spreadsheet Custom Cable List Printing Formats Creating a Database Appendix a Reference Data Coaxial Cable Technical Data Appendix a Reference Data A-4 Examples Appendix B Windowing Appendix B Windowing B-4