无线收发模块外文文献翻译、中英文翻译

1、 Wireless Transceiver Modules1. Introduction Radio transmitter devices are working in the radio frequency, so the requirements of the device is higher, the general time it is very difficult to complete under the conditions of production and testing work, and at present the application of radio techn

2、ology for more and more widely, especially for radio enthusiasts to a number of business that, in order to have all the high-frequency testing equipment is almost unrealistic, because the equipment is very expensive. In response to these actual circumstances, with many professional manufacturer spec

3、ializing in wireless data transmission for the wireless transceiver modules, will be high-frequency part of the work of installation and commissioning of all production sites in the professional completed, the user just to provide power and to be sent encoded data, the receiver can output data to be

4、 sent end of the original data, it can be the application of radio technology to promote. From the current radio transceiver module of the application point of view, can be divided into two categories: AM and FM transceiver module and transceiver modules。 In the wireless radio, television, communica

5、tions, remote control, telemetry and other devices or systems, in addition to the use of amplitude modulation (AM), but also widely used in frequency modulation ( FM). The following two main properties of modulation compared：1. Anti-interference capacityThe main advantage of FM is its strong anti-in

6、terference performance. The so-called anti-interference, and mainly refers to the input signal-noise ratio (SNR referred to as S / N) under the same conditions, the FM receiver output signal to noise ratio large AM receiver in the output signal to noise ratio. FM than AM and strong anti-interference

7、 system can be two reasons for the launch signal power system size for analysis. FM wave edge of the power frequency component is separated from the carrier out of power. MFM modulation coefficient the greater the number of its edges is not only more frequent, and the rate of increase, which means t

8、hat power in the carrier frequency into power while the proportion of large, and the AM frequency wave power while the largest carrier only power equivalent to half (when the modulation Index MAM = 1 pm). Therefore, Bobby AM and FM wave can have a greater frequency of side power, which means that it

9、 is better able to overcome the built-in channel or the noise and interference. Secondly, can receive signals from the comparison between mediation and analysis. AM signal as a result of the information has been included in the amplitude of AM signal (amplitude modulation signal and the amplitude is

10、 proportional to), solution of the envelope detector calls (also called amplitude demodulation) can not suppress parasitic AM interference; and information on the FM signal included in the high-frequency oscillations change the instantaneous frequency, the interference caused by the parasitic amplit

11、ude limiter (or with a limited role in the proportion of increase frequency discriminator) removed. Therefore, regardless of the margin from the launch frequency signal from the received signal power or the analysis of the demodulator, the FM systems are better than the anti-jamming performance of t

12、he system AM.2. Occupied bandwidthFM systems as a result of broadband frequency occupied bandwidth, FM is only suitable for over FM band (30Hz-30GHz) use. For the medium and long-wave band (MW:1000-100m, long-wave 10-1 km), while the use of AM or SSB Modulation.3. Transmitter powerFM transmitter sys

13、tem launched by the instantaneous FM carrier frequency changes with the modulation signal for the FM wave-wave, and its average power equal to the maximum power; and AM transmitter system is the AM signal to launch, when the MAM = 1 when the largest transmission power equal to average power (carrier

14、 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 demand

15、ing 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

16、puncture.5. Comparison of production costs FM series production of its testing device is a complex 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 perform

17、ance, 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

18、 performance and cost, the users of the two cases must be understood that the current widely used form of the AM transceiver components, 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 als

19、o focused on the introduction of this module.Wireless Transmitter Module DF data transmitter frequency for 315M, the use of SAW resonator frequency stabilization, high frequency stability, when the environmental temperature between -25 +85 degree changes, the frequency drift of only 3ppm / c Particu

20、larly 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 high-quality fine-tuning capacitance, temperature changes and vibra

21、tion 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 si

22、ngle-chip 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

23、 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 d

24、istance 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 grea

25、ter 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 long-dist

26、ance 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 consumptio

27、n, 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 DF-level data should be close to the actual operating vo

28、ltage 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 am

29、plitude 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 tran

30、smission 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 bee

31、n such a situation, where he was introduced to everyone, hope that they will be applied in this regard to a certain Kai User reference: We Card Room for the design of a wireless call system, uses the 1500 meters of the launch module (many manufacturers are making the same logo, or when the actual us

32、e of specific test environment.) This module of our Department in an open have experimented with in the 500 meters to the normal reception, but the use of here, away from the room after 5 can not receive, the actual distance of about 30 meters or so, the environment as follows: floor height of 2.6 m

33、eters, all the launch devices are installed in a closed box package. In order to achieve reliable function call, we increased the levels for signal amplification repeater after the realization of functions and the repeater are talking about here is our web site to introduce high-power wireless signa

34、l repeater. The above examples illustrate, the wireless device to send and receive a straight line better transmission performance, and performance will greatly reduce the diffraction.Wireless Receiver Module1 super renewable detector receiver Super Renewable detector circuit is actually a by interm

35、ittent oscillation control of high-frequency oscillator, the high-frequency oscillator using three-point capacitance oscillator, oscillation frequency and the transmitter frequency of the firing line. And intermittent oscillation is the oscillation in the high-frequency oscillations generated by the

36、 process, which in turn controls the high-frequency oscillator and intermittent oscillations. And intermittent oscillation frequency is determined by the parameters of the circuit (usually a hundred to a few hundred kHz). The low frequency of elections, and better anti-interference performance of th

37、e circuit, but the lower receiver sensitivity, on the contrary, the high frequency of elections, a better receiver sensitivity, but the anti-interference performance variation. Renewable detection circuit has high gain, in the absence of control signals received, due to spurious signals from outside

38、 interference and disturbance of thermal circuit itself, produce a unique noise, called ultra-noise, the noise frequency range for between 0.3 5kHz, sounds like a water-like whisper sound. In the absence of signals, ultra-high-level noise, amplified by the filter output noise voltage; when a control

39、 signal arrives, the circuit resonant, super noise was suppressed, began to produce high-frequency oscillator oscillation, the output signal. High-level circuit components Renewable related detector circuit, the control signal detected by the zoom level to deal with operational amplifier from the ou

40、tput signal output to a wireless receiver.2 Super heterodyne receiver demodulation receiverSuper 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 o

41、f the subtraction, resulting in a fixed frequency IF signal, the IF signal contains low-frequency amplitude modulation control signal to the IF signal to two or three-level amplification, detection and then to intermediate frequency signals contained in the low-frequency information taken out instru

42、ctions 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 th

43、e IF amplifier, and its signal can reach a large magnification, it is the circuit greatly enhance the receiver sensitivity is generally up to about 0.1mV, and the detector circuit super Renewable compared super heterodyne receiver module, in terms of receiver sensitivity, or selectivity have greatly

44、 improved in significantly more interference.无线收发模块 导言无线电的发射器件都工作于射频，因此对器件的要求也较高，一般业余条件下很难完成制作与调试工作，而目前对于无线电技术的应用越来越广泛，尤其对于一些业务无线电爱好者来说，要想拥有所有高频调试的设备几乎是不现实的，因为这些设备价格昂贵。针对这些实际情况，许多专业生产厂家专门生产了用于无线数据传输的无线收发模块，将对高频部分的安装与调试工作全部在专业生产场所内完成，用户只要为其提供电源和所要发送的编码数据，就可以在接收端的数据输出端得到发送端的原始数据，这样就可以将无线电技术的应用得到推广。从目前

45、对无线电收发模块的应用来看，主要可分为两大类：调频收发模块和调幅收发模块。 在无线广播、电视、通信、遥控、遥测等装置或系统中,除了采用振幅调制方式(AM)外,还广泛采用频率调制方式(FM)。下面对这两种调制方式的主要性能进行比较:1.抗干扰性能调频FM的主要优点是它的抗干扰性能强.所谓抗干扰好,主要是指在输入信号噪声比(简称信噪比S/N)相同的条件下,调频接收机输出端的信噪比大于调幅接收机输出端的信噪比。调频比调幅制的抗干扰能力强的原因可从两种制式的发射信号功率大小进行分析。调频波的边频分量的功率是从载波功率中分出来的。调制系数MFM越大,其边频不仅数目多,且幅度增大,这意味着载波功率中转化为

46、边频功率的比例大,而调幅波的边频功率最大仅等于载波功率的一半(当调制指数MAM1时)。因此,调频波比调幅波可以具有更大的边频功率,这意味着它更有能力去克服信道或机内的噪声和干扰。其次,可从接收信号的调解来进行对比并分析。由于调幅信号的信息包含在已调幅信号的振幅中(振幅变化与调制信号的振幅成正比),解调用的包络检波(也称振幅检波)器无法抑制寄生调幅干扰；而调频信号的信息则包含在高频振荡的瞬时频率变化上,因此,干扰引起的寄生调幅可通过限幅器(或用有限幅作用的比例鉴频器)去掉。因此,不管从发射信号的边频功率还是从接收信号的解调进行分析,调频制的抗干扰性能均优于调幅制。2.占用的频带宽度由于宽带调频系

47、统占用的频带宽,调频只适宜在超短波以上频段（30Hz30GHz）使用.对于中、长波频段（中波：1000-100m，长波101 km）,则采用调幅或单边带调制方式。3.发射机的功率调频制发射机发射的调频载波的瞬时频率是随调制信号变化的调频波为等幅波,它的最大功率等于平均功率;而调幅制发射机发射的是调幅信号,当MAM=1时,最大发射功率等于平均功率(载波功率)的4倍.若调幅发射机与调频发射机的末级采用同一型号的功率管,均按最大功率估算,则调频发射机发射出的功率是调幅发射机发射的平均功率的4倍。4.对调幅发射机功率放大管的要求苛刻调幅发射波是随调制信号的幅度而变化的,这就对放大管的反向耐压有较高的要

48、求,宜采用击穿电压更高的管子,否则管子易被击穿.而调频发射机是工作在等幅状态下的,管子不易被击穿。5.生产成本比较生产调频系列器件其调试过程相当复杂,所以需要配备综参测试仪、屏蔽室等昂贵的生产调试设备，调试设备的稳定性直接决定产品的性能，还需要专业的技术工人。而生产调幅器件相对来说要方便许多,所以生产调频产品的门槛要远远高于生产调幅产品,因此两者的生产成本相差一倍以上。通过以上对两者的性能及成本的介绍，网友必对两者的情况有所了解，目前被广泛运用的是调幅形式的收发组件，由于其性价比较高，同时生产也较为方便，因此对一些要求不是太高的场合来说，都采用了这种模式，因此本文中也重点对这种模块进行介绍。无

49、线发射模块DF数据发射模块的工作频率为315M，采用声表谐振器SAW稳频，频率稳定度极高，当环境温度在2585度之间变化时，频飘仅为3ppm/度。特别适合多发一收无线遥控及数据传输系统。声表谐振器的频率稳定度仅次于晶体，而一般的LC振荡器频率稳定度及一致性较差，即使采用高品质微调电容，温差变化及振动也很难保证已调好的频点不会发生偏移。 DF发射模块未设编码集成电路，而增加了一只数据调制三极管Q1,这种结构使得它可以方便地和其它固定编码电路、滚动码电路及单片机接口，而不必考虑编码电路的工作电压和输出幅度信号值的大小。比如用PT2262或者SM5262等编码集成电路配接时，直接将它们的数据输出端第17脚接至DF数据模块的输入端即可。 DF数据模块具有较宽的工作电压范围312V，当电压变化时发射频率基本不变,和发射模块配套的接收模块无需任何调整就能稳定