Amateur ExtraE0A05
What hazard is created by operating at microwave frequencies?
B
Answer
Safety
Type
A
Microwaves are ionizing radiation
B
The high gain antennas commonly used can result in high exposure levels
C
Microwaves are in the frequency range where wave velocity is higher
D
The extremely high frequency energy can damage the joints of antenna structures
Answer Notes
Microwave frequencies have very short wavelengths, which allows for the use of highly directional, high-gain antennas like parabolic dishes. While the actual transmitter power might be relatively low, the antenna focuses this energy into a very narrow, intense beam.
If a person accidentally walks into or stands in the path of this focused beam, they can be subjected to dangerously high RF exposure levels. Note that microwaves are non-ionizing radiation; they cause damage through tissue heating rather than cellular DNA mutation.
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When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?
Next · E0A06
Why are there separate electric (E) and magnetic (H) MPE limits at frequencies below 300 MHz?