21-533.fm Page 17 Thursday, August 5, 1999 3:47 PM

USING FIELD STRENGTH READINGS TO TUNE YOUR RADIO AND ANTENNA

You can use field strength measurements to monitor the effec- tiveness of changes you make to your radio and antenna while you make them. Changes you might make include:

Installing a new antenna or antenna cable

Adjusting the length of an antenna

Changing the antenna mount on your vehicle

Adjusting your radio’s transmitter

You do not need to connect the meter to the antenna or the ra- dio to measure field strength, but you will need two people. While someone presses the radio’s transmit key, you will need to note the readings you see on the meter.

Important: Be sure to follow any radio service regulations that limit the amount of time you can transmit without a break or sta- tion identification.

1.Remove the supplied short wire antenna attached to the bottom of the meter, then insert it into FS ANT on top of the meter.

2.Set CALIBRATION/FS/SWR to CALIBRATION/FS.

3.To calibrate the meter, have your helper select a channel or frequency on your transmitter and hold down its trans- mit key. Tell the helper not to speak into the microphone.

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Radio Shack 21-533 owner manual Using Field Strength Readings to Tune Your Radio and Antenna