RigExpert AA-1500 ZOOM
Antennas
Checking the antenna
It is a good idea to check an antenna
before connecting it to the receiving or
transmitting equipment. The
SWR chart
mode is good for this purpose.
The picture on the left shows the
SWR chart of a car VHF antenna. The
operating frequency is 145.5 MHz. The
SWR at this frequency is about 1.25,
which is acceptable.
The next screen shot shows SWR chart
of another car antenna. The actual
resonant frequency is about 146.7 MHz,
which is too far from the desired one.
The SWR at 145.5 MHz is 2.7, which is
not acceptable in most cases.
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