Radio Shack 21-533 owner manual Introduction

21-533.fm Page 2 Thursday, August 5, 1999 3:47 PM

INTRODUCTION

Your RadioShack CB/Ham Field-Strength SWR Meter helps you tune your CB or amateur radio system for the best per- formance.

CB and amateur radio systems work best when the antenna system’s impedance matches the transmitter’s output im- pedance as closely as possible. The meter’s standing wave ratio (SWR) function helps you trim your antenna to the pre- cise length you need for the maximum transmitted power.

The meter’s field strength function helps you position your antenna for the best coverage and determine the effective- ness of changes you make to your antenna, antenna cable, and transmitter.

Carefully read all of these instructions to get the best use from this meter.

Warning: You can use this meter to make measurements on equipment that uses high voltages. Carefully observe all safety precautions provided with the equipment you are test- ing.

Note: You need a separate 50-ohm coaxial cable (such as RG-58U) with a PL-259 connector connected to both ends (such as Cat. No. 278-968, not supplied), long enough to reach from your radio’s antenna jack to the back of the meter.

© 1998 Tandy Corporation.

All Rights Reserved.

RadioShack is a registered trademark used by Tandy Corporation.

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