maximum usable frequency

简明释义

最大可能用频率最大可用频率

英英释义

例句

1.The technician explained how to calculate the maximum usable frequency 最大可用频率 based on atmospheric conditions.

技术员解释了如何根据大气条件计算最大可用频率。

2.For effective long-distance communication, knowing the maximum usable frequency 最大可用频率 is crucial.

为了有效的远程通信，了解最大可用频率至关重要。

3.During the storm, we had to find the maximum usable frequency 最大可用频率 to maintain contact with the rescue team.

在暴风雨期间，我们必须找到最大可用频率以保持与救援队的联系。

4.The pilot requested a frequency check to ensure they were within the maximum usable frequency 最大可用频率 range.

飞行员请求进行频率检查，以确保他们在最大可用频率范围内。

5.The radio operator adjusted the equipment to ensure they were communicating on the maximum usable frequency 最大可用频率 for their location.

无线电操作员调整了设备，以确保他们在其位置上进行通信的频率为最大可用频率。

作文

In the world of radio communications, understanding the concept of maximum usable frequency is essential for effective transmission and reception of signals. The maximum usable frequency (often abbreviated as MUF) refers to the highest frequency at which a radio wave can be transmitted between two points via ionospheric reflection. This phenomenon occurs because the ionosphere, a layer of the Earth's atmosphere, can reflect certain radio frequencies back to the Earth, allowing for long-distance communication. However, not all frequencies are suitable for this purpose at all times, which is where the concept of maximum usable frequency comes into play.To better understand the importance of maximum usable frequency, we must consider the factors that influence it. The ionosphere is affected by solar activity, time of day, and season, which can all cause variations in its density and composition. For instance, during the day, the sun's radiation increases the ionization levels in the ionosphere, which can raise the maximum usable frequency. Conversely, at night, the absence of sunlight leads to lower ionization levels, which can decrease the maximum usable frequency.Knowing the maximum usable frequency is crucial for radio operators, especially those involved in amateur radio and international communications. By selecting frequencies below the maximum usable frequency, operators can ensure that their signals will be successfully reflected by the ionosphere, allowing them to reach distant receivers. If they choose frequencies above the maximum usable frequency, the signals may penetrate the ionosphere and escape into space, resulting in poor or non-existent communication.Moreover, the maximum usable frequency can vary based on geographic location. For example, regions closer to the equator may experience higher maximum usable frequency values due to the thicker ionosphere, while polar regions may have lower values. This variability necessitates that radio operators be aware of their local conditions and adjust their frequency usage accordingly.In practical terms, radio operators often utilize tools and charts that provide real-time data on the maximum usable frequency. These resources help them determine the best frequencies for their communications, especially for long-range contacts. Additionally, advancements in technology have led to the development of software applications that can predict the maximum usable frequency based on current ionospheric conditions, making it easier for operators to plan their transmissions.In conclusion, the concept of maximum usable frequency is vital for anyone involved in radio communications. Understanding how it works and the factors that influence it can greatly enhance the effectiveness of signal transmission. As technology continues to evolve, so too will our understanding of the ionosphere and its impact on radio frequencies. For both amateur and professional radio operators, mastering the concept of maximum usable frequency can lead to more successful and reliable communications across vast distances.

在无线电通信的世界中，理解“最大可用频率”的概念对于有效的信号传输和接收至关重要。“最大可用频率”（通常缩写为MUF）是指通过离子层反射，在两个点之间可以传输的最高频率。这种现象发生是因为离子层是地球大气层的一部分，可以将某些无线电频率反射回地球，从而实现远程通信。然而，并非所有频率在任何时候都适合用于此目的，这就是“最大可用频率”概念的重要性所在。为了更好地理解“最大可用频率”的重要性，我们必须考虑影响它的因素。离子层受到太阳活动、昼夜变化和季节的影响，这些因素都会导致其密度和成分的变化。例如，在白天，太阳辐射增加了离子层的电离水平，这可能提高“最大可用频率”。相反，在夜间，缺乏阳光会导致电离水平降低，从而降低“最大可用频率”。了解“最大可用频率”对无线电操作员尤其重要，特别是那些参与业余无线电和国际通信的人。通过选择低于“最大可用频率”的频率，操作员可以确保他们的信号能够成功地被离子层反射，从而到达远方的接收器。如果他们选择的频率高于“最大可用频率”，信号可能会穿透离子层并逃逸到太空，导致通信质量差或根本无法通信。此外，“最大可用频率”的值可能因地理位置而异。例如，靠近赤道的地区由于离子层较厚，可能会经历较高的“最大可用频率”值，而极地地区则可能具有较低的值。这种变化使得无线电操作员需要了解当地条件，并相应调整他们的频率使用。在实际操作中，无线电操作员通常会利用提供实时数据的工具和图表来获取“最大可用频率”。这些资源帮助他们确定最佳的通信频率，尤其是在进行长距离联系时。此外，技术的进步导致了软件应用程序的发展，这些程序可以根据当前的离子层条件预测“最大可用频率”，使操作员更容易规划他们的传输。总之，“最大可用频率”的概念对任何参与无线电通信的人来说都是至关重要的。理解它的工作原理及其影响因素可以大大增强信号传输的有效性。随着技术的不断发展，我们对离子层及其对无线电频率影响的理解也将不断加深。对于业余和专业无线电操作员来说，掌握“最大可用频率”的概念可以带来更成功和可靠的远程通信。