【正文】 c Particularly suitable for a collection of multiple wireless re mote control and data transmission system. SAW resonator frequency stability after the crystal, and general LC oscillator frequency stability and consistency of poor, even with highquality finetuning capacitance, temperature changes and vibration has been transferred it is difficult to ensure good frequency point migration will occur. DF does not have code to launch module integrated circuits, and an increase of a data modulation transistor Q1, such a structure can be easily made it, and other fixed coding circuit, a rolling code and singlechip interface circuits, without having to consider the work of coding circuit voltage and output value of the size range of the signal. For example, using PT2262 or SM5262 matching circuits, such as coding, the data directly to the output of their first 17 feet then to DF data input module. DF data module has a wide operating voltage range 3 ~ 12V, when the voltage changes in firing frequency is essentially the same, and the transmitter module of the receiver module supporting the need for any adjustment will be able to receive stable. When the firing voltage of 3V, the open transmission distance to about 20 ~ 50 meters, less transmission power, when the voltage of 5V is about 100 ~ 200 meters, when the voltage of 9V is about 300 ~ 500 meters, when fired when the voltage of 12V for optimum operating voltage, with the launch of better results. When the voltage and the power increase is greater than l2V, effective radiated power not markedly improved. Different circuit parameters, have different transmission power and transmitting distance, the launch in order to obtain better results, must be connected to an antenna, choose the best antenna wire 25 centimeters long, the best longdistance transmission can be erected, because the radio When signal transmission is affected by a number of factors, so the general practical distance from the nominal only half or even less, this point needs to be developed to observe. DF data module using ASK modulation mode to reduce power consumption, when the data signals to stop when the emission current zero, the data signal transmitter and DF input resistance can be used or can not be directly connected to capacitive coupling, or DF module will not be able to launch normal work. Data DFlevel data should be close to the actual operating voltage modules in order to obtain the effect of higher modulation. DF preferably vertical launch modules mounted on the edge of the motherboard should be left around the device more than 5mm to the impact from the distribution of parameters. DF module transmission distance and signal frequency and amplitude modulation, firing voltage and battery capacity, transmitting antenna, receiver sensitivity, send and receive environment. Generally the largest launch in the open distance of about 800 meters, there are obstacles in the circumstances, the distance will be shortened, due to radio signal transmission in the process of refraction and reflection will form a number of death and instability in the region, different transceiver environment will have different from the transceiver. This is the users must pay attention to, and the author of such modules in the use of application, there had been such a situation, where he was intr