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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Radio Shack 21-533 owner manual SWR Scales