Radio Shack 21-533 User Manual

Cat. No. 21-533
OWNER’S MANUAL
Please read before using this equipment.
CB/Ham Field-Strength
SWR Meter
21-533.fm Page 1 Thursday, August 5, 1999 3:47 PM

Radio Shack 21-533 Specifications

General

Type	Digital Multimeter
Continuity Test	Yes
DC Voltage Ranges	200mV, 2V, 20V, 200V
AC Voltage Ranges	200V
DC Current Ranges	200μA, 2mA, 20mA, 200mA, 10A
Resistance Ranges	200Ω, 2kΩ, 20kΩ, 200kΩ, 2MΩ
Battery Required	9V
Functions	Voltage, Current, Resistance, Continuity, dB
Display	3.5 digit LCD

Summary

Introduction

Measuring SWR

Connecting the Meter

Connects the SWR meter to the radio and antenna using coaxial cable.

Calibrating the Meter/Measuring SWR

Step-by-step guide to calibrate the meter and take SWR readings.

Interpreting SWR Readings

Explains how to understand SWR values and their efficiency.

Improving SWR

Provides methods to reduce SWR for better performance.

Measuring Field Strength

Preparing the Antenna Site

Steps to map the area around an antenna for field strength measurement.

Calibrating the Meter/Measuring Field Strength

Procedure to calibrate the meter for field strength testing.

Using Field Strength Readings to Tune Your Radio and Antenna

How to use field strength data to optimize radio and antenna performance.

Care and Maintenance

Schematic Diagram

Specifications