Radio Shack TRC-446 owner manual Standing Wave Ratio Guidelines, Standing Wave Ratio Performance

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STANDING WAVE RATIO GUIDELINES

The ideal standing wave ratio (SWR) is 1:1, or a meter reading of 1 on the SWR meter's top scale. This reading, however, can only be obtained under laboratory con- ditions. A SWR ratio of 1.5:1 to 2:1 is excellent for most mobile CB antenna applica- tions. This chart helps you interpret the different readings you might see.

Standing Wave Ratio Performance

Ratio

Rating

Evaluation

 

 

 

 

 

 

1:1 – 1.5:1

Superior

Perfect match between the an-

 

 

tenna/cable and the RF output of

 

 

the CB.

 

 

 

1.5:1 – 2:1

Excellent

The antenna/cable system is an

 

 

outstanding match to the trans-

 

 

mitter’s RF output. Ideal for most

 

 

CB installations.

 

 

 

2:1 – 3:1

Good

The antenna/cable system will

 

 

perform to specification under

 

 

most normal conditions.

 

 

 

Higher than

Inefficient

Indicates a need to inspect the

3.1:1

 

system, the mounting of the

 

 

antenna and all pertinent hard-

 

 

ware.

 

 

 

Prolonged exposure to salt spray, humidity, weather-induced corrosion, or vehicle vi- bration can cause antenna performance to degrade with a subsequent rise in the SWR. Anytime you notice that the SWR reading is greater than 3:1, check the condi- tion of the antenna, the antenna cable and all antenna connectors and hardware.

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Contents TRC-446 Features FCC Information Contents Mounting the Microphone Holder InstallationMounting the TRC-446 Connecting Microphone Antenna Connecting an Antenna Installing AN Antenna Using Vehicle Battery Power Selecting an AntennaConnecting Optional External Speakers Using the CB AS a Base StationExternal CB Speaker Set S/RF/SWR/CAL to CAL Adjusting the Standing Wave RatioPublic Address Speaker Set S/RF/SWR/CAL to SWRStanding Wave Ratio Performance Standing Wave Ratio GuidelinesRatio Rating Evaluation Quick Look AT the Controls NoaaOperation Turning on the CB and Receiving TransmissionsListening to Weather Broadcasts Changing Channels Using the Controls on the MicrophoneTransmitting Frequency Channel MHzUsing the Public Address Function Weather AlertBusiness Uses CB Operation TipsTypical Uses For a CB Radio Personal UsesUsing Common 10-CODES Code MeaningMaximum Range Reducing NoiseSymptom Check That TroubleshootingCH9/NOR/CH-19 is set to NOR Care and Maintenance Replacing the Fuses Specifications GeneralPublic Address Fm Page 23 Thursday, May 13, 1999 403 PM Limited Ninety-Day Warranty Vised of the Possibility of Such Damages
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