This book is one of the \"Illustrated Fun Electronic Production\" series. It mainly provides typical examples for radio enthusiasts who are keen on making equipment by themselves, explains the principles of circuits, imparts practical debugging experience, etc. The author himself is a radio communication enthusiast. In the early small radio transceiver competitions and later research, he has accumulated rich experience in the production and use of small radio transceivers. This book is divided into seven chapters. The contents of Chapter 1 to Chapter 4 are directly related to the design and production of small radio transceivers. They introduce the circuit principles, component configuration, production points and adjustment experience of amateur frequency bands, low-power radio transmitters and receivers. Chapter 5 involves instruments and testing technologies related to the production and application of radio transceivers. Chapter 6 explains antennas. Chapter 7 is an extension of radio applications. For example, optical fiber, amplification, filtering and power supply issues. In short, this book does not spend too much space on theory, but is concerned with hands-on, practical, and experience-oriented. It is suitable for amateur electronics enthusiasts to learn and refer to. Chapter 1 Receiver 1 1.150MHz AM Specific Frequency Receiver 1 1.1.1 Circuit 2 1.1.2 Fabrication 3 1.1.3 Adjustment 3 1.1.4 Application 3 1.1.5 References 5 1.2Fox Chaser?II (144MHz) 5 1.2.1 Circuit 5 1.2.2 Fabrication 6 1.2.3 Adjustment 8 1.2.4 Usage 9 1.2.5 Notes 9 1.3Fox Chaser?II (430MHz) 9 1.3.1 Circuit 9 1.3.2 Fabrication 10 1.3.3 Adjustment and Usage 12 1.4Fox PiPi (144MHz) 12 1.4.1 Circuit 12 1.4.2 Fabrication 13 1.4.3 Adjustment 14 1.4.4 Usage 15 1.4.5 Additional Notes 15 Chapter 2 Additional Equipment for the Receiving Section 16 2.1GaAs RF Low Noise Amplifier 16 2.1.1 Fabrication 17 2.1.2 Adjustment 17 2.1.3 Installation 18 2.1.4 Others 18 2.2 GaAs Preamplifier for Satellite Communication (144MHz) 19 2.3 430MHz GaAs Preamplifier 20 2.3.1 Circuit 20 2.3.2 Fabrication 21 2.3.3 Adjustment 22 2.3.4 Usage 22 2.3.5 KNOW HOW 22 2.4 Passive AF Filter for CW 23 2.5 Stereo Listening to CW 25 2.5.1 Passive Filter 26 2.5.2 Fabrication 27 2.5.3 Usage 27 2.6 Converting a Cheap Radio to a 50MHz AM Crystal Converter 28 2.6.1 Crystal Converter 28 2.6.2 BC Wave Interference 28 2.6.3 Circuit Diagram and Assembly 29 2.6.4 Adjustment 31 2.6.5 Assembly 32 2.6.6 Usage 32 2.6.7 Notes 33 2.7 Crystal Converter for Converting a Cheap Radio to a 41m Band 33 2.7.1 Local Oscillation 33 2.7.2 Listening to the 31m Band 34 2.7.3 Effect of Converting a 100 Yen Radio 34 2.8 Long Wave JJY Reception Converter 35 2.8.1 Converting Standard Wave JJY to Long Wave 35 2.8.2 Circuit Description 35 2.8.3 Production 36 2.8.4 Adjustment 38 2.8.5 Usage 38 Chapter 3 Transmitter 39 3.1 FM Wireless Microphone 39 3.1.1 Improving Stability 39 3.1.2 Sound Quality 41 3.1.3 Usage 41 3.2 10mW, 50MHz AM Transmitter 42 3.2.1 Circuit 42 3.2.2 Wiring 44 3.2.3 Confirmation of the circuit 45 3.2.4 Connection to the power supply 45 3.2.5 Adjustment of the oscillation circuit 46 3.2.6 Adjustment of the final stage 46 3.2.7 Adjustment of the modulation stage 47 3.2.8 Application 47 3.3 0.75mW, 50MHz AM transmitter 48 3.3.1 Circuit 48 3.3.2 Fabrication and adjustment 49 3.3.3 Application 50 3.450MHz PSN type SSB transmitter 51 3.4.1 Circuit 51 3.4.2 Fabrication and adjustment 53 3.5 300mW, 50MHz AM integrated transmitter 54 3.5.1 Circuit 54 3.5.2 Fabrication 55 3.5.3 Adjustment 57 3.5.4 Measurement of modulation 57 3.5.5 Adjustment of modulation (without an oscilloscope) 58 3.5.6 Usage 58 Chapter 4 Additional devices for the transmission part 60 4.1 Throat microphone 60 4.1.1 Production method 61 4.1.2 Usage method 61 4.2 Microphone compressor with LC filter 62 4.3 MAC CMOS keyer 64 4.3.1 Short/long memory 64 4.3.2 Hitting two space keys at the same time 64 4.3.3 Clock synchronization 65 4.3.4 Circuit and production 65 4.4 VOX for portable radio transceiver 67 4.4.1 Composition of VOX 67 4.4.2 Circuit and production 69 4.4.3 Adjustment 69 4.4.4 Usage method 70 4.4.5 Precautions 70 4.5 Morse code trainer 71 4.5.1 Circuit 71 4.5.2 Production 72 4.5.3 Usage method 72 4.5.4 Function expansion 72 4.6 Keying adapter 73 4.710mW, 50MHz AM Transmitter with VXO 73 Chapter 5 Measuring Instruments 76 5.1RF Probe 76 5.1.1 Fabrication 77 5.1.2 Usage 77 5.2 Full Range Variable Instrument 78 5.2.1 Fabrication 78 5.2.2 Usage 80 5.2.3 Summary 81 5.3 Inductance Meter 81 5.3.1 Description of the Circuit 81 5.3.2 Fabrication 82 5.3.3 Adjustment 85 5.3.4 Fabrication of the Panel 87 5.3.5 Fabrication of the Variable Capacitor Knob 87 5.3.6 Knob Installation 88 5.3.7 Casing Processing 88 5.3.8 Usage 88 5.4 Electric Field Strength Meter 89 5.4.1 Circuit 89 5.4.2 Fabrication 90 5.4.3 Experiment 92 5.4.4 Calibration 92 5.4.5 How to use 94 5.5 Standing wave ratio tester (M), (BNC) 94 5.5.1 Production ① 94 5.5.2 Calibration 97 5.5.3 Production ② 98 5.5.4 Reference 98 5.6 SWR bridge for HF to 430MHz QRP 99 5.6.1 Production 99 5.6.2 Adjustment 101 5.6.3 How to use 101 5.6.4 Others 101 5.7 Noise bridge 102 5.7.1 Circuit 102 5.7.2 Production 103 5.7.3 Calibration 106 5.7.4 Reactance calibration 106 5.7.5 Resistance calibration 108 5.7.6 Reactance conversion 108 5.7.7 Advantages of using reactance value 109 5.7.8 Drawing scale 109 5.7.9 Pasting scale plate 109 5.7.10 Simple Calibration Method 110 5.7.11 Practical Usage Method 111 5.8 QRP Power Meter (M) 111 5.8.1 Circuit Principle 112 5.8.2 Fabrication 112 5.8.3 Calibration 113 5.8.4 Usage Method 114 5.9 Micro Power Meter 114 5.9.1 Results of Seven Years of Research 115 5.9.2 Circuit Description 116 5.9.3 Fabrication 117 5.9.4 Calibration 119 5.9.5 Usage Method 120 5.9.6 Others 120 5.10 RF Probe III 120 5.10.1 Circuit 120 5.10.2 Fabrication 120 5.10.3 Fabrication of Ground Wire 123 5.10.4 Fabrication of Simulated Load 123 5.10.5 Dashboard 123 5.10.6 Usage Method 124 5.10.7 Calibration 124 5.10.8 Measurement Conditions and Ground Length 125 5.11 Sine Wave Injector 126 5.12 AF Millivoltmeter Adapter 127 5.12.1 OP Amplifier 127 5.12.2 Circuit 128 5.12.3 Fabrication 129 5.12.4 Usage 130 5.13 Antenna Impedance Meter 130 5.13.1 Circuit 131 5.13.2 Fabrication 131 5.13.3 Adjustment 133 5.13.4 Usage 133 5.13.5 Usage Effect 133 5.14 Simulated Load 10W (M) 134 Chapter 6 Antennas 135 6.14 30MHz Polarized Antenna 135 6.1.1 FCZ Printed Circuit Balun 135 6.1.2 Fabrication 136 6.1.3 Usage 140 6.2430MHz dual-element printed circuit antenna 140 6.2.1 Fabrication ① 141 6.2.2 Adjustment 143 6.2.3 Fabrication ② 143 6.2.4 Usage 144 6.3 1200MHz 5-element printed circuit antenna 144 6.4 1200MHz GP polarized antenna 145 6.4.1 Features 146 6.4.2 Production 146 6.4.3 Usage 150 6.4.4 Measurements 150 6.5 200W super antenna balanced/unbalanced converter 151 6.5.1 Problems with existing balanced/unbalanced converters 151 6.5.2 Analysis of the characteristics of balanced/unbalanced converters 151 6.5.3 Results of further experiments 152 6.5.4 Balance of C and L 152 6.5.5 Experiments on #048 core 154 6.5.6 Insertion loss 155 6.5.7 Influence of wiring method 156 6.5.8 Experiments on increasing the size of the core 156 6.5.9 Calm analysis 157 6.5.10 Making a Super Antenna Balanced-Unbalanced Converter (200W) 157 6.5.11 How to Use 160 6.5.12 Experimental Results 161 6.5.13 Bare Resistor 161 6.650W Super Antenna Balanced-Unbalanced Converter 162 6.7 Luminous Antenna 164 6.8 Tiny Loop Electromagnetic Antenna 165 6.8.1 Printed Circuit Board Antenna 165 6.8.2 Making ① 166 6.8.3 Adjustment 166 6.8.4 Making ② 167 6.8.5 Improving Gain 167 6.8.6 How to Use 167 Chapter 7 Other Additional Devices 168 7.1 Fiber Optic Connector Kit 168 7.1.1 How to Process the Plug 169 7.1.2 How to Process the Socket 169 7.1.3 Notes 169 7.2 Fiber Optic AM Transmitter and Receiver 169 7.2.1 Transmitter 170 7.2.2 Receiver 170 7.2.3 Fabrication 171 7.2.4 Applications and others 172 7.3 Fiber optic buzzer 172 7.3.1 Fabrication and adjustment 173 7.3.2 Reference 174 7.4 430MHz printed circuit balanced?unbalanced converter 174 7.4.1 Printed circuit balanced?unbalanced converter 174 7.4.2 Usage 176 7.5 1200MHz printed circuit balanced?unbalanced converter 177 7.6 NJM2073 bridge push-pull amplifier 178 7.6.1 Fabrication 179 7.6.2 Usage 179 7.6.3 Advantages of NJM2730 180 7.7 Class D amplifier 181 7.7.1 Two-cell dry cell speaker driver chip 181 7.7.2 What is a Class D Amplifier? 181 7.7.3 Circuit 185 7.7.4 Power Supply Circuit 185 7.7.5 Production 186 7.7.6 Others 186 7.87/10MHz T-type Filter 188 7.8.1 Production 188 7.8.2 Usage 190 7.8.3 3?5MHz Applications 190 7.9UM?3×6 NiCd Battery Charger (Constant Voltage) 191 7.9.1 Usage 192 7.9.2 Tips 192 7.10 Temperature Switch (Including SSR, Directly Control AC100V) 192 7.10.1 Circuit 193 7.10.2 Usage 194 7.10.3 Precautions 195 7.10.4 Application 195 7.11 Over-discharge Alarm 195 7.12 Rain Sensor 196 7.12.1 Circuit Description 197 7.12.2 Fabrication Method 198 7.12.3 Trial Operation 199 7.12.4 Installation into Enclosure 199 7.12.5 Application 199
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