Radio Shack 21-533 owner manual SWR Scales

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21-533.fm Page 7 Thursday, August 5, 1999 3:47 PM

5.Press the transmit key again, then read the SWR by not- ing the needle’s position on the upper SWR scale. A meter reading of 1 on the upper scale is ideal.

SWR Scales

The figure shown between the upper and lower scales on the meter (% REF POWER) indicates the percentage of power that is wasted through reflection of the signal from the antenna back into the antenna cable. For example, an SWR reading of 1.5 also means that 4% of your signal power is lost. However, 96% of the radio power is more than enough for almost all applications.

6.Repeat Steps 1–5 for each channel or frequency you want to get an SWR reading for.

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Contents CB/Ham Field-Strength SWR Meter Introduction Contents Measuring SWR Connecting the MeterCalibrating the Meter Measuring SWR Fm Page 6 Thursday, August 5, 1999 347 PM SWR Scales Interpreting SWR Readings Improving SWR Hints Measuring Field StrengthPreparing the Antenna Site Fm Page 12 Thursday, August 5, 1999 347 PM Calibrating the METER/ Measuring Field Strength Set CALIBRATION/FS/SWR to CALIBRATION/FS Dot Fm Page 16 Thursday, August 5, 1999 347 PM Using Field Strength Readings to Tune Your Radio and Antenna Fm Page 18 Thursday, August 5, 1999 347 PM Care and Maintenance Fm Page 20 Thursday, August 5, 1999 347 PM Schematic Diagram Specifications Limited Ninety-Day Warranty RadioShack