Simple long-distance wireless FM microphone circuit

The loop antenna L1 is utilized for emission and also functions as the oscillation coil. The high-frequency current flowing through the antenna is synchronized in resonance with the oscillation frequency, ensuring optimal emission performance. Practical applications indicate that the effective launching distance is approximately 100 to 150 meters in an empty mine.

The loop antenna, designated as L1, plays a dual role in this circuit design. It not only serves as the primary emission component but also acts as the oscillation coil, contributing to the overall functionality of the device. The design takes advantage of the principle of resonance, where the high-frequency current that circulates within the loop antenna is carefully tuned to match the oscillation frequency of the system. This synchronization is critical as it maximizes the efficiency of the antenna, allowing it to operate in an optimal emission state.

In practical scenarios, such as in an empty mine environment, the loop antenna has demonstrated a launching distance of approximately 100 to 150 meters. This range can be influenced by various factors, including the surrounding environment, the presence of obstacles, and the specific parameters of the oscillation frequency and current.

For enhanced performance, the design may incorporate additional components such as tuning capacitors and inductors to fine-tune the resonance conditions. The careful selection of materials for the antenna and its configuration can also significantly impact the efficiency and range of the emitted signal. A well-designed loop antenna can achieve a balance between size, weight, and performance, making it suitable for various applications where reliable communication over distances is required.

To further optimize the system, considerations regarding the impedance matching between the antenna and the transmitter circuit may be necessary. This ensures that maximum power transfer occurs, thereby enhancing the overall effectiveness of the emission system. Additionally, the implementation of feedback mechanisms could be explored to maintain the resonance condition dynamically, adapting to variations in environmental conditions or operational parameters.The the loop antenna L1 for emission also serves as the oscillation coil, the high-frequency current flowing in antenna is synchronized resonance with the oscillation frequency, so it is always in the best emission state. Accoring to practice, launching distance is about 100 ~ 150m in empty mine. In contrast, in the case of equal working voltage, current and.. 🔗 External reference