lowest usable frequency

简明释义

最低可用频率最低使用频率

英英释义

例句

1.The lowest usable frequency (最低可用频率) is crucial for ensuring reliable long-distance radio communications.

确保可靠的长距离无线电通信的关键是最低可用频率（最低可用频率）。

2.Engineers must consider the lowest usable frequency (最低可用频率) when designing communication networks for remote areas.

工程师在为偏远地区设计通信网络时，必须考虑最低可用频率（最低可用频率）。

3.The military communication system operates effectively at the lowest usable frequency (最低可用频率) to penetrate dense environments.

军事通信系统在最低可用频率（最低可用频率）下有效运行，以穿透密集环境。

4.The radio technician adjusted the settings to ensure the signal was transmitted at the lowest usable frequency (最低可用频率) for optimal reception.

无线电技术员调整设置，以确保信号以最低可用频率（最低可用频率）进行传输，以获得最佳接收效果。

5.During the experiment, we measured the lowest usable frequency (最低可用频率) of the antenna to determine its efficiency.

在实验中，我们测量了天线的最低可用频率（最低可用频率）以确定其效率。

作文

In the world of radio communications, the concept of lowest usable frequency plays a crucial role in ensuring effective transmission and reception of signals. The lowest usable frequency refers to the minimum frequency at which a radio wave can be transmitted and still be effectively received by a receiver. This frequency is influenced by various factors such as atmospheric conditions, the type of terrain, and the intended distance of communication. Understanding the lowest usable frequency is essential for both amateur and professional radio operators who rely on radio waves to communicate over long distances.One of the primary considerations when determining the lowest usable frequency is the ionosphere's behavior. The ionosphere is a layer of the Earth's atmosphere that reflects certain frequencies of radio waves back to the ground, allowing for long-distance communication. However, this reflection is not uniform across all frequencies. Typically, lower frequencies are more effective during nighttime, while higher frequencies work better during the day. Therefore, radio operators must carefully select their transmission frequencies based on the time of day and the lowest usable frequency that can be achieved under current conditions.Another factor that affects the lowest usable frequency is the geographic location of the transmitter and receiver. For instance, mountainous regions may obstruct radio signals, requiring operators to adjust their frequencies accordingly. Similarly, urban areas with tall buildings can create interference, impacting the lowest usable frequency that can be used effectively. Understanding these geographical influences allows radio operators to optimize their communication strategies.The lowest usable frequency also has significant implications for emergency communications. In times of crisis, reliable communication is paramount. Knowing the lowest usable frequency can help emergency responders establish communication links when traditional methods fail. For instance, during natural disasters, when infrastructure may be compromised, radio operators can utilize lower frequencies to reach distant stations or relay information to those in need.Moreover, advancements in technology have introduced new methods for determining the lowest usable frequency. Software-defined radios (SDRs) and other modern equipment can analyze environmental conditions in real-time, allowing operators to adjust their frequencies dynamically. This adaptability is crucial in maintaining effective communication, especially in rapidly changing situations.In conclusion, the lowest usable frequency is a fundamental concept in radio communications that influences how signals are transmitted and received. By understanding the factors that affect this frequency, including atmospheric conditions, geographic location, and technological advancements, radio operators can enhance their communication capabilities. Whether for personal use or in emergency situations, mastering the concept of the lowest usable frequency is essential for anyone involved in radio communications. It ensures that messages are conveyed clearly and effectively, bridging distances and connecting people across the globe.

在无线电通信的世界中，最低可用频率的概念在确保信号有效传输和接收方面发挥着至关重要的作用。最低可用频率指的是可以传输并且仍能被接收机有效接收的无线电波的最低频率。这个频率受到多种因素的影响，如大气条件、地形类型和通信的预期距离。理解最低可用频率对依赖无线电波进行长距离通信的业余和专业无线电操作员来说至关重要。确定最低可用频率时，主要考虑的一个因素是电离层的行为。电离层是地球大气的一层，能够将某些频率的无线电波反射回地面，从而实现远距离通信。然而，这种反射并不是在所有频率上都均匀。通常，较低的频率在夜间更有效，而较高的频率在白天效果更佳。因此，无线电操作员必须根据一天中的时间以及当前条件下可以达到的最低可用频率来仔细选择他们的传输频率。影响最低可用频率的另一个因素是发射器和接收器的地理位置。例如，山区可能会阻碍无线电信号，需要操作员相应地调整他们的频率。同样，城市地区的高楼大厦可能会造成干扰，影响可以有效使用的最低可用频率。理解这些地理影响使无线电操作员能够优化他们的通信策略。最低可用频率对紧急通信也有重要影响。在危机时期，可靠的通信至关重要。了解最低可用频率可以帮助紧急响应人员在传统方法失效时建立通信链接。例如，在自然灾害期间，当基础设施可能受到损害时，无线电操作员可以利用较低的频率与远处的站点联系或向需要帮助的人传递信息。此外，技术的进步引入了新的方法来确定最低可用频率。软件定义无线电（SDR）和其他现代设备可以实时分析环境条件，使操作员能够动态调整他们的频率。这种适应能力对于保持有效沟通至关重要，特别是在快速变化的情况下。总之，最低可用频率是无线电通信中的一个基本概念，它影响着信号的传输和接收。通过理解影响这一频率的因素，包括大气条件、地理位置和技术进步，无线电操作员可以增强他们的通信能力。无论是出于个人使用还是紧急情况，掌握最低可用频率的概念对于任何参与无线电通信的人来说都是必不可少的。它确保信息清晰有效地传达，跨越距离，将全球的人们连接在一起。