Radio Shack 21-533 Marine Instruments User Manual


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