Monthly Archive August 17, 2022

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Two Expressions of Interphone Frequency, Wavelength And Frequency

When writing the communication mode of the interphone, the wavelength or frequency is usually written, such as 2meter or 150MHz. This table lists the correspondence between the commonly used wavelength band and frequency

Wave Length 10 Meter 6 Meter 5 Meter 2 Meter 70 Centimeter
Frequency 30MHz 50MHz 60MHz 150MHz 440MHz

The relationship between wavelength and frequency is that they are inversely proportional, wave velocity = wavelength × Therefore, electromagnetic waves with different frequencies have different wavelengths in the air. The propagation speed of electromagnetic waves with different frequencies (or different wavelengths) is the same. The propagation speed in the air is about 3x10e8 M / s. The higher the frequency of electromagnetic waves, the shorter the corresponding wavelength. The electromagnetic wave having a larger frequency has a shorter wavelength. Radio waves have the longest wavelength (lowest frequency), while rays have the shortest wavelength (highest frequency)

Generally, radio waves refer to the peak 30ghz (Giga Hertz) from the extremely low frequency 10kHz to the extremely high frequency. Because the radio spectrum beyond this range has very different characteristics, such as light and X-rays. However, the above-mentioned 10kHz to 30ghz is usually divided into seven areas, of which the high frequency 3-30MHz is what we usually call short wave

Very Low Frequency, 10KHz – 30KHz
Low Frequency, 30KHz – 300KHz
Medium Frequency, 30KHz – 3000KHz
High Frequency, 3MHz – 30MHz
Very High Frequency, 30MHz – 300MHz
UHF Ultra High Frequency, 300MHz – 3000MHz
SHF Super High Frequency, 3GHz – 30GHz