User guide
Table Of Contents
- Title Page
- Table of Contents
- Chapter 1 General Information
- Chapter 2 Functions and Operations
- Chapter 3 Getting Started
- Chapter 4 Cable and Antenna Analyzer Measurements
- Chapter 5 Power Monitor Mode
- Chapter 6 High Accuracy Power Meter
- Chapter 7 Handheld Software Tools
- Chapter 8 Master Software Tools
- Appendix A Windowing
- Index
CW Mode/RF Immunity
CW mode can be used to maximize sweep speeds of both frequency and DTF measure
-
ments. With CW on, sweep times can be twice as fast as with CW off. However, making
measurements with CW on will reduce the instrument’s immunity to interfering signals. In
a controlled environment, this reduced immunity should not be a problem. In the field
however, there can be stray signals from nearby or co-located transmitters that can affect
frequency and DTF measurements. Turning CW on and off can verify that the Site Master
is reducing the interfering signals. If there is no appreciable difference, then it should be
safe to make measurements with CW on.
Use this feature with caution, as the later introduction of an interfering signal might be mis-
taken for a problem with the antenna or cable run.
If CW is on during a normal RL or SWR measurement, the Site Master will be more sus-
ceptible to interfering signals. Interfering signals can make the measurement look better or
worse than it really is.
Information Required for a Line Sweep
The following information must be determined before attempting a line sweep measure-
ment:
q
System Frequency Range, to set the sweep frequency
q
Cable Type, to set the cable characteristics for DTF measurements
q
Distance of the Cable Run, to set the distance for DTF measurements
Typical Line Sweep Test Procedures
This section provides typical line sweep measurements used to analyze the performance of
a transmission feed line system.
System Return Loss Measurement
System return loss measurement verifies the performance of the transmission feed line sys-
tem with the antenna connected at the end of the transmission line. To measure the system
return loss:
Required Equipment
q
Site Master Model S331D
q
Precision Open/Short, Anritsu 22N50 or
Precision Open/Short/Load, Anritsu OSLN50-1 or
InstaCal Module ICN50B
q
Precision Load, Anritsu SM/PL-1
q
Test Port Extension Cable, Anritsu 15RNFN50-1.5-R
q
Optional 510-90 Adapter, DC to 7.5 GHz, 50 ohm, 7/16(F)-N(M)
Device Under Test
q
Transmission Feed Line with Antenna
Chapter 4 Cable & Antenna Measurements
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