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The wireless transmitting and receiving modules are widely used in fields such as wireless monitoring, wireless networks, and wireless meter reading due to their small size, low cost, and high-speed data transmission capability. However, factors such as temperature, voltage, and transmission distance can affect its transmission efficiency, so attention should be paid to these details when in use.
The operating voltage range of the wireless transmitting and receiving module is 3-12V. When the voltage changes, the transmission frequency remains basically unchanged, and the receiving module matched with the transmitting module can receive stably without any adjustments.
When the transmission voltage is 3V, the transmission distance in an open area is about 20-50 meters, and the transmission power is relatively small. When the voltage reaches 5V, the transmission distance becomes around 100-200 meters, and when the voltage is 9V, it becomes about 300-500 meters. When the transmission voltage reaches 12V, it becomes the optimal operating voltage and has better transmission efficiency. The transmission current is around 60 mA, and the transmission distance in an open area reaches 700-800 meters, with a transmission power of around 500 mW.
When the voltage is higher than 12V, the power consumption increases, and the effective transmission power no longer significantly improves. The feature of this wireless module is that the transmission power is relatively high, the transmission distance is relatively far, and it can adapt to communication under harsh conditions.
The best option for the antenna is a 25-centimeter wire. Due to certain factors that affect the transmission of radio signals, the antenna should be upright during long-distance transmission. In general, the actual operating distance is only about 20% or even less than the nominal distance. This point should be taken into consideration during development.
The wireless remote controller's transmitting frequency of the wireless transmitting and receiving module is 315M, and a SAW resonator is used for frequency stabilization. Its frequency stability is very high, with only 3ppm/degree of frequency drift when the ambient temperature changes between -25℃ and 85℃.
It is particularly suitable for multiple transmitting and receiving wireless remote control and data transmission systems. The frequency stability of the SAW resonator is only second to the crystal, and the frequency stability and consistency of general LC oscillators are poorer. Even with high-quality tuning capacitors, it is challenging to ensure that the tuned frequency point will not shift due to temperature changes and vibration.
The transmitting module of the wireless module is best installed vertically on the edge of the motherboard, at least 5mm away from the surrounding components to avoid being affected by distributed parameters. The transmission distance of the DF module depends on factors such as the modulation signal frequency and amplitude, transmission voltage, battery capacity, transmission antenna, receiver's sensitivity, and the transmitting and receiving environment. Generally, the maximum transmission distance in an open area is about 800 meters, but it will be shortened in the presence of obstacles. Due to the refraction and reflection of radio signals during transmission, there are dead zones and unstable areas, resulting in different transmission distances in different transmitting and receiving environments.
In addition, the wireless transmitting and receiving module is a product controlled by single-chip programming, and can be coded as per customers' requirements to achieve the ideal state. However, the electromagnetic interference of the single-chip will affect the efficiency of the wireless module, and isolation is needed to suppress its interference. It is recommended to use methods such as power isolation and port isolation, using triodes or comparators.
