The objective of this book is to allow the reader to predict the received signal power produced by a particular radio transmitter. The first two chapters examine propagation in free space for point-to-point and point-to-area transmission, respectively. This is combined with a dis- cussion regarding the characteristics of antennas for various purposes. In chapter 3, the effect of obstacles, whether buildings or mountains, is discussed and analytical methods, whereby the strength of a signal is the shadow of an obstacle can be predicted, are presented.
标签： Propagation Essentials Radio Wave of
上传时间： 2020-05-27
上传用户：shancjb
In this presentation, we will look at what the Serial Peripheral Interface, otherwise known as the SPI, is. and how it is used to communicate data to and from the PICmicro microcontroller.SPl is frequently used when few 1/O lines are available, but communication between two or more devices must be fast and easy to implement.In this presentation, we will discuss the following topics: We will first cover an Overview of SPI This section of the tutorial will introduce you to SPI and its concepts.Next, we will examine the use of SPI on the PICmicro MCU.The details of how SPI is implemented on a PICmicro device will be examined.Then, a Code Walkthrough will be given.The walkthough will explore code for both an SPI Master and SPI Slave. The example will have the Master generate data for sending to the slave.Finally, there will be a few resources given at the end of the presentation. These resources will allow you to explore in more detail the SPI interface
标签： spi协议
上传时间： 2022-06-20
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1.创建一个新项目：激活Design Manager，在菜单File中选择New Workspace，然后填入项目名称expl。2.输入网单文件：在Tools菜单中选择TextEdit，输入如下所示的网单文件。3.保存文件：将文件命名为expl.cir。4.对电路进行模拟：在Tools菜单中选择PspiceA/D，再在PspiceA/D的File菜单中选择Open，打开已保存过的输入文件expl.cir。5.检查出错：如果文件中出现了语法错误，PspiceA/D就会弹出错误提示框，并运行Message Viewer，告诉用户错误信息。如果输入文件没有语法错误，PspiceA/D就显示正确模拟的对话框，如图3-3类似，从图中可读出电路标题、元器件个数以及计算中所耗内存信息。6.查看输出文件：在File菜单中选择examine 0utput，就可以通过Text Editor来浏览输出文件。输出文件中的各节点电压如下所示。由此可得出如下所示的静态工作点参数：Vw=2.9646V，Vow=7.1878-2.1919=4.9959V，Tg=Va/R.=2.1919/2.3=0.953mA。7.观察输出波形：在PspiceA/D的File菜单中选择Run Probe，或者在Design Manager 中选择Tools下的Probe，都可以调出Probe。Probe自动设置横坐标，纵坐标必须通过手动添加。在菜单Trace中选择Add，在Add Traces对话框的Trace Expression中输入V（6）/V（1），测量放大倍数。8.在Probe中，单击Plot菜单下的Add YAxis，增加一个新纵轴。9.单击Trace菜单下的Add，在Trace Expression中输入V（1）/I（V1），测量输入电阻，输出曲线如图2-2所示。
标签： pspice
上传时间： 2022-07-02
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