外文翻譯--無(wú)線(xiàn)收發(fā)模塊-其他專(zhuān)業(yè)(參考版)
2025-01-23 10:12本頁(yè)面
【正文】 when a control signal arrives, the circuit resonant, super noise was suppressed, began to produce highfrequency oscillator oscillation, the output signal. Highlevel circuit ponents Renewable related detector circuit, the control signal detected by the zoom level to deal with operational amplifier from the output signal output to a wireless receiver. 2 Super heterodyne receiver demodulation receiver Super heterodyne receiver circuit and the general working principle of the super heterodyne radio the same principle. Received signal will be magnified, and to generate the local oscillation signal amplitude of the subtraction, resulting in a fixed frequency IF signal, the IF signal contains lowfrequency amplitude modulation control signal to the IF signal to two or threelevel amplification, detection and then to intermediate frequency signals contained in the lowfrequency information taken out instructions on the correct remote control signal. As the IF amplifier with automatic gain control loop, so it can design very high gain and regulator work, making both super heterodyne receiver signal or weak signal, can do basically the same as the amplification multiples, but also because the use of the IF amplifier, and its signal can reach a large magnification, it is the circuit greatly enhance the receiver sensitivity is generally up to about , and the detector circuit super Renewable pared super heterodyne receiver module, in terms of receiver sensitivity, or selectivity have greatly improved in significantly more interference. 。 and AM transmitter system is the AM signal to launch, when the MAM = 1 when the largest transmission power equal to average power (carrier power) 4 times. If the AM transmitter and FM transmitter at the end of the introduction of the same type of power tubes, according to the maximum power is estimated that the FM transmitter emits power AM transmitter is fired 4 times the average power. 4. AM transmitter power amplifier for the demanding pipe Launched wave amplitude is the amplitude modulation signal with the change, which the reverse of the zoom control a higher voltage, should adopt a higher breakdown voltage of the tube, or easily puncture the tube. And FM transmitter is the amplitude in the state, the tube can not easily be puncture. 5. Comparison of production costs FM series production of its testing device is a plex process, so the need for testing is equipped with fully mechanized Senate, shielding room of the production of expensive testing equipment, testing equipment directly determine the stability of performance, but also the needs of professional skilled workers. AM production devices are relatively easy to many, so the threshold for the production of FM products is much higher than the production of AM products, therefore the difference between the cost of production more than doubled. Above both the performance and cost, the users of the two cases must be understood that the current widely used form of the AM transceiver ponents, because of its higher cost and at the same time more convenient for production, so request is not too high on some occasions, the use of this model, this paper also focused on the introduction of this module. Wireless Transmitter Module DF data transmitter frequency for 315M, the use of SAW resonator frequency stabi
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