lowest useful frequency

简明释义

最低使用频率最低可用频率

英英释义

例句

1.In marine communication, identifying the lowest useful frequency is crucial for long-distance communication.

在海洋通信中，识别最低有效频率对于远距离通信至关重要。

2.The lowest useful frequency for this radar system allows it to penetrate through heavy rain.

该雷达系统的最低有效频率使其能够穿透大雨。

3.We need to calculate the lowest useful frequency to ensure our signals are received effectively.

我们需要计算最低有效频率以确保我们的信号被有效接收。

4.The radio engineer adjusted the transmission to the lowest useful frequency for better signal clarity.

无线电工程师调整了传输至最低有效频率以获得更好的信号清晰度。

5.During the workshop, we learned how to determine the lowest useful frequency for various applications.

在研讨会上，我们学习了如何为各种应用确定最低有效频率。

作文

In the field of radio communications, understanding the concept of lowest useful frequency is essential for optimizing signal transmission and reception. The term lowest useful frequency refers to the minimum frequency at which a radio wave can effectively propagate through the atmosphere and still maintain a usable signal. This frequency is crucial for various applications, including amateur radio, aviation communication, and emergency services. When considering the lowest useful frequency, several factors come into play, such as the type of terrain, atmospheric conditions, and the intended range of communication. For instance, lower frequencies tend to travel longer distances and can diffract around obstacles, making them ideal for rural or mountainous areas. However, they may also be more susceptible to noise and interference from other signals. On the other hand, higher frequencies can provide clearer signals and are less affected by noise, but they typically have a shorter range and may struggle to penetrate obstacles like buildings or mountains. Therefore, determining the appropriate lowest useful frequency for a specific situation requires careful analysis of these variables. For example, in emergency situations where reliable communication is critical, first responders often rely on radios that operate within a specific frequency range. By utilizing the lowest useful frequency, they can ensure that their signals reach the intended recipients, even in challenging environments. This is particularly important in disaster scenarios where conventional communication infrastructures may be compromised. Moreover, the lowest useful frequency plays a significant role in aviation communications. Pilots and air traffic controllers depend on precise frequency allocations to maintain clear and uninterrupted communication. Understanding the lowest useful frequency helps ensure that transmissions are effective, reducing the likelihood of miscommunication that could lead to dangerous situations. In recent years, advancements in technology have allowed for better modulation techniques and receiver sensitivity, enabling communication at lower frequencies with improved quality. However, the fundamental principles surrounding the lowest useful frequency remain unchanged. It is still vital for engineers and operators in the field to grasp this concept to enhance the effectiveness of their communication systems. In conclusion, the lowest useful frequency is a critical parameter in the realm of radio communications. Its understanding is vital for ensuring efficient and reliable communication across various sectors, including emergency services and aviation. As technology continues to evolve, the importance of mastering the lowest useful frequency will only increase, reinforcing the need for ongoing education and training in this essential area of study.

在无线电通信领域，理解“最低有效频率”的概念对于优化信号传输和接收至关重要。术语“最低有效频率”指的是无线电波能够有效传播并保持可用信号的最低频率。这一频率对于业余无线电、航空通信和紧急服务等各种应用至关重要。在考虑“最低有效频率”时，多个因素会影响其选择，比如地形类型、大气条件和通信的预期范围。例如，较低的频率往往能够传播更远的距离，并能够绕过障碍物，这使它们非常适合农村或山区。然而，它们可能更容易受到噪声和其他信号干扰的影响。另一方面，较高的频率可以提供更清晰的信号，并且不太受噪声的影响，但它们通常具有较短的范围，可能难以穿透建筑物或山脉等障碍物。因此，为特定情况确定合适的“最低有效频率”需要对这些变量进行仔细分析。例如，在需要可靠通信的紧急情况下，第一响应者通常依赖于在特定频率范围内运行的无线电。通过利用“最低有效频率”，他们可以确保信号到达预期接收者，即使在挑战性的环境中也是如此。这在灾难场景中尤为重要，因为常规通信基础设施可能会受到破坏。此外，“最低有效频率”在航空通信中也发挥着重要作用。飞行员和空中交通管制员依赖于精确的频率分配来保持清晰和不间断的通信。理解“最低有效频率”有助于确保传输有效，减少可能导致危险情况的误通信的可能性。近年来，技术的进步使得更好的调制技术和接收器灵敏度得以实现，从而提高了在较低频率下的通信质量。然而，围绕“最低有效频率”的基本原则仍然没有改变。在这一领域，工程师和操作人员掌握这一概念仍然至关重要，以增强其通信系统的有效性。总之，“最低有效频率”是无线电通信领域的一个关键参数。理解这一点对于确保各个行业（包括紧急服务和航空）的高效和可靠通信至关重要。随着技术的不断演进，掌握“最低有效频率”的重要性只会增加，从而强化在这一重要研究领域进行持续教育和培训的必要性。