lower sideband

简明释义

下边带

英英释义

例句

1.Many amateur radio enthusiasts prefer using lower sideband for clearer communication.

许多业余无线电爱好者更喜欢使用下边带来实现更清晰的通信。

2.The radio operator adjusted the frequency to tune into the lower sideband.

无线电操作员调整频率以调谐到下边带。

3.When transmitting on a lower sideband, it is important to use proper modulation techniques.

在下边带上发射时，使用正确的调制技术非常重要。

4.The lower sideband mode is often used in SSB (Single Side Band) communications.

下边带模式通常用于SSB（单边带）通信中。

5.To improve signal quality, switch to lower sideband when conditions are poor.

在条件不佳时，切换到下边带以改善信号质量。

作文

In the realm of radio communications, the term lower sideband refers to a specific method of modulation used in single-sideband (SSB) transmission. This technique is particularly significant in amateur radio and various forms of professional communication, where efficient use of bandwidth is crucial. To understand the concept of lower sideband, it is essential to first grasp the basics of amplitude modulation (AM). In AM, a carrier wave is modulated by the information signal, creating two sidebands: the upper sideband (USB) and the lower sideband (LSB). The lower sideband contains the lower frequency components of the modulated signal, while the upper sideband contains the higher frequency components.The practical application of lower sideband is most evident in voice communication. When operators utilize SSB, they often choose between the upper and lower sidebands based on their equipment and the conditions of the radio spectrum. The lower sideband is favored in many HF (high frequency) bands because it tends to produce a clearer signal with less interference, especially in crowded frequencies. This clarity is vital for effective communication, particularly in emergency situations or during contests where every word counts.Moreover, the lower sideband is also advantageous because it allows for more efficient power usage. By transmitting only one sideband instead of both, operators can conserve energy and reduce distortion. This efficiency is particularly important for portable stations that rely on battery power. Additionally, using the lower sideband can help minimize the overall bandwidth used in a transmission, allowing more channels to coexist within the same frequency range.In technical terms, the lower sideband can be defined as the frequency spectrum that lies below the carrier frequency. For example, if the carrier frequency is set at 7.1 MHz, the frequencies that constitute the lower sideband will range from 7.1 MHz down to the lowest frequency of the modulating signal. This characteristic allows operators to tune their receivers to the desired signal while filtering out unwanted noise and interference.Understanding the lower sideband is not just about knowing its definition; it also involves recognizing its impact on radio communications. For instance, during a conversation using SSB, operators must adjust their equipment to select either the lower sideband or upper sideband depending on the signals they are trying to receive or transmit. This selection process is critical, as choosing the wrong sideband can result in distorted or unintelligible audio.In conclusion, the term lower sideband represents a fundamental aspect of radio communication technology. By utilizing this method of modulation, operators can enhance the clarity and efficiency of their transmissions. Whether in amateur radio or professional settings, understanding the lower sideband is essential for anyone looking to engage effectively in the world of radio communications. As technology continues to evolve, the principles behind the lower sideband will remain relevant, ensuring that this technique will be utilized for years to come.

在无线电通信领域，术语lower sideband指的是单边带（SSB）传输中使用的一种特定调制方法。这项技术在业余无线电和各种专业通信形式中尤为重要，因为有效利用带宽至关重要。要理解lower sideband的概念，首先必须掌握幅度调制（AM）的基础知识。在AM中，载波波被信息信号调制，产生两个边带：上边带（USB）和lower sideband（LSB）。lower sideband包含调制信号的低频成分，而上边带则包含高频成分。lower sideband的实际应用在语音通信中最为明显。当操作员使用SSB时，他们通常根据设备和无线电频谱的条件选择上边带或下边带。由于在拥挤的频率中，lower sideband往往能产生更清晰的信号，因此在许多HF（高频）频段中受到青睐。这种清晰度对于有效沟通至关重要，尤其是在紧急情况下或在比赛中，每一个字都很重要。此外，lower sideband还具有节省功率的优势。通过仅传输一个边带而非两个，操作员可以节省能源并减少失真。这种效率对依赖电池供电的便携式站点尤其重要。此外，使用lower sideband还可以帮助最小化传输中使用的整体带宽，从而允许更多频道在同一频率范围内共存。从技术角度来看，lower sideband可以定义为低于载波频率的频谱。例如，如果载波频率设置为7.1 MHz，则构成lower sideband的频率范围将从7.1 MHz向下延伸到调制信号的最低频率。这一特性使操作员能够调整接收器以选择所需信号，同时过滤掉不必要的噪声和干扰。理解lower sideband不仅仅是了解其定义；还涉及认识到它对无线电通信的影响。例如，在使用SSB进行对话时，操作员必须调整设备以选择lower sideband或上边带，具体取决于他们试图接收或传输的信号。这个选择过程至关重要，因为选择错误的边带可能导致音频失真或无法理解。总之，术语lower sideband代表了无线电通信技术的基本方面。通过利用这种调制方法，操作员可以增强其传输的清晰度和效率。无论是在业余无线电还是专业环境中，理解lower sideband对任何希望有效参与无线电通信世界的人来说都是必不可少的。随着技术的不断发展，lower sideband背后的原则将保持相关性，确保这一技术在未来多年内继续得到应用。