Improving Swr - Radio Shack 21-534 Owner's Manual

21-534.fm Page 9 Thursday, August 5, 1999 3:53 PM
When you measure SWR, use this chart to determine the per-
centage of power that is wasted through reflection of the signal
back to the radio.
SWR 1.0 1.1
Ref. 0 0.22
Power
(%)
For example, an SWR reading of 1.5 also means that 4% of
your signal power is lost. However, 96% of the radio's power is
more than enough for almost all applications.

IMPROVING SWR

There are several ways to improve the SWR of your radio/an-
tenna combination. Try these first.
• Be sure you are using the type of cable recommended for
your equipment. If the manufacturer recommends a 50-
ohm cable, do not substitute another type that has a differ-
ent impedance.
• Confirm that you mounted your antenna according to the
manufacturer's instructions. The angle and the base
arrangement can affect the SWR reading.
1.2 1.5 2.0 2.5
0.8 4.0 11.1 18.4
3.0
25.0
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