Traditional Culture Encyclopedia - Weather inquiry - What do WB and TV on the radio mean?
What do WB and TV on the radio mean?
There are no bands in meteorology. The meteorological band you mentioned should be the most important detection tool used by meteorological departments in detecting weather systems, and meteorological radar has one band. Weather radar uses a wide range of radio wavelengths, from 1 cm to 1000 cm. They are usually divided into different bands to represent the main functions of radar. The commonly used wavelengths of 1, 3, 5, 10 and 20cm correspond to K-band (wavelength 0.75 ~ 2.4cm), X-band (wavelength 2.4 ~ 3.75cm), C-band (wavelength 3.75 ~ 7.5cm) and S-band (wavelength 7.5 ~ 65cm) respectively. The performance of radar in detecting atmospheric targets is closely related to its working wavelength. Considering the scattering and absorption of radio waves by cloud and rain particles, various bands have only a certain scope of application. K-band radar is often used to detect clouds that do not produce precipitation, while X-band radar, C-band radar and S-band radar are used to detect precipitation. Among them, S-band radar is most suitable for detecting rainstorm and hail, and ultra-high frequency and ultra-high frequency radar with high sensitivity can detect the clear sky flow field in troposphere-stratosphere-middle layer.
As long as your local TV station transmits wireless signals with high signal strength, any radio with TV sound receiving frequency can receive some TV station sounds (that is, several TV sound signals with frequency range of 40-92MHz) in VL and VH frequency bands (that is, 1- 12 channels of old TV sets). But that's all. It is impossible for any audio-visual radio to receive the audio of all the above 12 TV channels, let alone the U-band and Z-band (supplementary channels) 100 channels today.
Moreover, most cities have entered the era of digital TV and cable TV, and there are fewer and fewer TV signals transmitted wirelessly. Therefore, TV sound radios are not as attractive as they were many years ago.
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