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5. Applications
5.1. Antennas
5.1.1. Checking the antenna
I
t is a good idea to check an antenna before connecting it to the receiving or
transmitting equipment. The SWR graph mode is good for this purpose:
The above picture shows SWR graph of a car VHF antenna. The operating frequency is
160 MHz. The SWR at this frequency is about 1.2, which is acceptable.
The next screen shot shows SWR graph of another car antenna:
The actual resonant frequency is about 135 MHz, which is too far from the desired one.
The SWR at 160 MHz is 2.7, which is not acceptable in most cases.
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