Are longwave radios still useful today? What is a shortwave station? What is a longwave radio?

1. Long-wave radio stations are still in use, and long-wave mainly relies on ground wave propagation.

2. It's possible. A radio with long-wave capability (e.g. Tecsun PL660 or Tecsun PL365, etc.) is required

3. The medium wave is between 500-1600kHz, which is propagated by sky wave and ground wave, mainly ground wave propagation during the day, and sky wave and ground wave propagation at night. As a result, more medium-wave radio is heard at night than during the day.

Shortwave 1600kHz-30MHz, mainly propagated by skywaves, because the signal can be reflected back and forth between the atmospheric ionosphere and the ground, so the propagation distance is long.

Long waves range from 100 kHz to 400 kHz and are propagated mainly by ground waves.

4. It is possible to listen to it, provided that the military signal is an analog signal, but now the military uses encrypted digital signals to transmit due to its special conditions, and ordinary people cannot listen to it without a special decoder.

First. In use, the long wavelength is used to exceed the water depth and will not be absorbed by the water.

Second, it is possible if your antenna is ten meters long and wide.

Third. Bands.

Fourth. It's possible, but the military ones are encrypted, and you can't listen to them even if you receive them.

Long wave can only be used for communication with submarines, and at present it is still the only effective and reliable air-to-submarine and shore-to-submarine communication methods, which can ensure that submarines can receive individual commands underwater.

1. Long-wave radio equipment maintenance is expensive, transmitter power consumption is large, and the popularity of the Internet and regional FM radio has led to a decrease in listeners, European long-wave radio is generally in a stage of decline, the daily broadcast time is reduced, and several large transmitter stations are shut down in various countries every year. Recently produced radios have rarely included the beam cons LW (long wave) band.

2. The minimum amateur frequency stipulated by the state is about 160 meters, and long wave (LF) refers to electromagnetic waves with a wavelength range of 10 1 kilometers (the frequency of the rubber group is 30 300 kHz).

Shortwave radio stations from 1700kHz to 30MHz, mainly used for long-distance radio communication, because shortwave propagation by sky waves, the signal is reflected back and forth between the ionosphere and the ground, a 100W shortwave radio can be transmitted all over the world under good conditions. Therefore, shortwave stations are often used for international broadcasting, maritime communications, timing services, amateur radio communications, etc.

Long wavelengths are long, with frequencies between 100kHz and 300kHz. It mainly relies on ground wave propagation, and is mainly used for timing services and long-wave broadcasting (which is rarely used now).

There are two ways to represent radio waves: wavelength and frequency, China is used to using frequency to express, while foreign countries use wavelength.

The longer the wavelength, the lower the frequency.

The long-wave conduction distance is long, and it is generally used in shipping and other occasions; The short wave distance is also far but shorter than the long wave, and is used for broadcasting, communication, etc.