目录
1 无线电广播和接收概述........................................................................................................................6
1.1 无线电广播........................................................................................................................................6
1.2 电磁波的发射和接收........................................................................................................................6
1.3 振幅调制（Amplitude Modulation）.......................................................................................7
1.4 频率调制（Frequency Modulation）......................................................................................8
2 设计原理..............................................................................................................................................10
2.1 收音机原理......................................................................................................................................10
2.2 超外差及超外差收音机的工作原理..............................................................................................11
2.2.1 超外差...........................................................................................................................................11
2.2.2 超外差收音机的工作原理...........................................................................................................12
2.3 六管超外差式调幅收音机的整机电路..........................................................................................16
3 元件说明..............................................................................................................................................16
3.1 电阻..................................................................................................................................................16
3.2 电解电容和瓷片电容......................................................................................................................17
3.3 三极管..............................................................................................................................................17
3.4 中周及磁棒线圈..............................................................................................................................17
3.5 双连拨盘..........................................................................................................................................17
3.6 耳机插座..........................................................................................................................................18
3.7 变压器..............................................................................................................................................18
3.8 发光二极管和喇叭..........................................................................................................................18
3.9 电位器..............................................................................................................................................18
4 收音机的焊接组装..............................................................................................................................18
4.1 烙铁的使用......................................................................................................................................19
4.1.1 使用要求.......................................................................................................................................19
4.1.2 焊接方法.......................................................................................................................................19
4.2 元件安装..........................................................................................................................................19
5 调试及故障排除..................................................................................................................................20
6 总 结.....................................................................................................................................................24
7 参考文献..............................................................................................................................................25
评论0