Question
What weather condition might decrease range at microwave frequencies?
Answer Options
- A) High winds
- B) Low barometric pressure
- C) Precipitation
- D) Colder temperatures
Correct Answer: C
Explanation
At microwave frequencies (those above 1000 MHz), the wavelength of the signal becomes very short, on the order of centimeters. At this small scale, atmospheric elements like raindrops, snowflakes, or dense fog droplets are large enough to interfere significantly with the signal.
Therefore, precipitation (heavy rain, snow, or dense fog) can cause significant attenuation (signal loss) through both absorption (T3A02) and scattering of the microwave signal. This drastically reduces the effective communication range, a phenomenon rarely observed at lower VHF/UHF frequencies.
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