A longwave station is a radio station that operates in the long-wave frequency band, usually a station operating in the range of 30 kHz to 300 kHz. This frequency band is characterized by a relatively long propagation distance of the signal, strong penetration ability, and is suitable for covering a wide area.
Long-wave radio stations mainly have the following characteristics and applications:
1.Large area coverage: The propagation of longwave signals is less affected by the earth's surface, so longwave stations are suitable for broadcast coverage over a large area, especially at night when longwave signals travel farther away.
2.Skywave propagation: Longwave signals can be transmitted through skywave propagation, which means that the signal can bypass the curvature of the earth, making the longwave station have a wider coverage.
3.Time signals: Some longwave stations are used to broadcast time signals, which are important for synchronizing clocks and other time-related applications.
4.Military Communications: Due to the penetrating nature of long-wave signals, long-wave radios also have certain applications in military communications, which can provide reliable communication in environments with complex terrain or other communication blockages.
The main difference between longwave stations and radio stations is the operating frequency band and the field of application. Radio stations cover a wider range of frequency bands, including medium wave, short wave, FM, etc., while longwave stations focus on long wave bands. In addition, the propagation characteristics of longwave radios make them more effective in specific application scenarios.
There are several reasons why the signal of a longwave station is difficult to receive on some devices:
1.Antenna design: Longwave signals have relatively long wavelengths and require antennas of corresponding lengths to receive signals effectively. Some devices may not have antennas specifically designed for long-wave reception, or the antenna length may be insufficient, resulting in poor signal reception.
2.Device Band Coverage: Some devices may be designed for communication in a higher frequency range, while longwave signals have lower frequencies and are not within the band coverage of the device, so the device cannot receive them.
3.Signal attenuation: The propagation of long-wave signals is less affected by the earth's surface, but in densely built areas such as cities, tall buildings, power lines, etc., may cause the signal to be absorbed or reflected, resulting in attenuation. In such an environment, the device's ability to receive long-wave signals may be affected.
4.Interference: The long-wave frequency band is also susceptible to various electromagnetic interference, such as electrical equipment, lighting equipment, etc., which may generate noise in the long-wave frequency band, reducing the clarity and reliability of the signal.
5.Antenna directivity: The reception of long-wave signals sometimes requires antennas with specific directivity to ensure optimal reception. If the antenna of the device is not suitable for the reception directionality of the long-wave band, the signal reception will also be affected.
6.Technical Specifications: Some devices may not be designed in accordance with the technical specifications for longwave signals. The reception of long-wave signals requires certain technical specifications and hardware design, and if the equipment does not take these factors into account, it may result in the signal not being received.
In general, the reception of longwave signals is influenced by a range of technical and environmental factors. To improve the success rate of long-wave signal reception, it is necessary to use equipment specially designed for long-wave reception, adjust the antenna appropriately, avoid interference, and receive it under suitable environmental conditions.