Dream 是 Digital Radio Mondiale (DRM) 接收器的软件实现。 借助 Dream，可以使用改进的模拟接收器（SW、MW、LW）和带有声卡的 PC 接收 DRM 广播。
2021-11-29 22:15:16
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Android 开灯 关灯 checkbox Radio组件用法演示,向大家展示了如何为CheckBox和RadioButton添加监听器及开关灯业务代码，通过单击不同的按钮，切换开灯图片和关灯图片，设置程序操作状态如下：
public void setBulbState(boolean state){
//设置图片状态
ImageView iv=(ImageView)findViewById(R.id.ImageView01);
iv.setImageResource((state)?R.drawable.bulb_on:R.drawable.bulb_off);
CheckBox cb=(CheckBox)this.findViewById(R.id.CheckBox01);
cb.setText((state)?R.string.off:R.string.on);
cb.setChecked(state);//设置复选框文字状态
RadioButton rb=(RadioButton)findViewById(R.id.off);
rb.setChecked(!state);
rb=(RadioButton)findViewById(R.id.on);
rb.setChecked(state);//设置单选按钮状态
}
2021-11-25 20:14:16
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pretty.css是一款纯css3漂亮的checkbox和radio美化效果。pretty.css可以和多种字体图标结合使用，对原生的checkbox和radio进行美化，还可以制作按钮点击时的动画效果。
2021-11-23 15:56:22
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Contents
Preface page xiii
1 Introduction 1
1.1 RF circuits 2
1.2 Narrowband nature of RF signals 3
1.3 AC circuit analysis – a brief review 3
1.4 Impedance and admittance 4
1.5 Series resonance 4
1.6 Parallel resonance 5
1.7 Nonlinear circuits 5
Problems 5
2 Impedance matching 10
2.1 Transformer matching 11
2.2 L-networks 12
2.3 Higher Q – pi and T-networks 14
2.4 Lower Q – the double L-network 15
2.5 Equivalent series and parallel circuits 16
2.6 Lossy components and efficiency of matching networks 16
Problems 17
3 Linear power amplifiers 19
3.1 Single-loop amplifier 19
3.2 Drive circuitry: common-collector, common-emitter,
and common-base 20
3.3 Shunt amplifier topology 22
3.4 Dual-polarity amplifiers 22
3.5 Push–pull amplifiers 23
3.6 Efficiency calculations 25
3.7 AC amplifiers 26
3.8 RF amplifiers 29
3.9 Matching a power amplifier to its load 31
Problems 31
4 Basic filters 34
4.1 Prototype lowpass filter designs 35
4.2 A lowpass filter example 36
4.3 Lowpass-to-bandpass conversion 38
Appendix 4.1 Component values for normalized
lowpass filters 41
Problems 43
References 45
5 Frequency converters 46
5.1 Voltage multiplier as a mixer 46
5.2 Switching mixers 48
5.3 A simple nonlinear device as a mixer 51
Problems 53
6 Amplitude and frequency modulation 54
6.1 Amplitude modulation 55
6.2 Frequency and phase modulation 58
6.3 AM transmitters 62
6.4 FM transmitters 65
6.5 Current broadcasting practice 65
Problems 66
7 Radio receivers 67
7.1 Amplification 67
7.2 Crystal sets 68
7.3 TRF receivers 68
7.4 The superheterodyne receiver 69
7.5 Noise blankers 74
7.6 Digital signal processing in receivers 75
Problems 75
References 76
8 Suppressed-carrier AM and quadrature AM (QAM) 77
8.1 Double-sideband suppressed-carrier AM 77
8.2 Single-sideband AM 78
8.3 Product detector 80
8.4 Generation of SSB 81
8.5 Single-sideband with class C, D, or E amplifiers 83
8.6 Quadrature AM (QAM) 84
Problems 85
References 86
9 Class-C, D, and E Power RF amplifiers 87
9.1 The class-C amplifier
2021-11-23 07:20:57
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CListCtrl中嵌入Check，Radio，CComboBOx等控件
2021-11-17 15:20:02
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