Type Attenuation dB/ft Length ft = Loss dB | Anritsu S251C instruction

Chapter 4 Measurements

Step 14. Verify the measured insertion loss against the calculated insertion loss:

	Type	Attenuation (dB/ft)	Length (ft)	= Loss (dB)
First Jumper	LDF4-50A	0.0325	20	0.65

Main Feeder	LDF5-50A	0.0186	150	2.79

Top Jumper	LDF4-50A	0.0325	10	0.325

The number of connector pairs (3) times the loss per pair (in dB) equals the con- nector loss: 3 0.14 = 0.42.

The insertion loss of the transmission system is equal to:

First Jumper loss + Main Feeder Loss + Top Jumper Loss + Connector Loss = Insertion Loss

0.65

+

2.79

+

0.325

+ 0.42

= 4.19 dB

Figure 4-3is an example of a typical transmission line cable loss trace.

Figure 4-3. Typical Transmission Line Cable Loss Trace

4-6

Image 51

Anritsu S251C manual Type Attenuation dB/ft Length ft = Loss dB

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 the Battery in the Optional Charger Battery InformationCharging a New Battery Charging the Battery in the Site Master 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