搜索 - 科创

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这是一台70年代的日本收音机，拥有最全的波段，和解调方式。都是无线电监听者梦寐以求的功能。内部有70年代最强科技-----集成电路，JFTE管，陶瓷滤波器。还有奢华的18个空气可变电容。屏...

ESVN是罗德与施瓦茨公司上上代主力测试接收机，相同构架下，生产有用于无线电侦察与频谱管理的ESN系列监测接收机（ESN/ESVN20/ESVN40）和用于电磁兼容测试的ESV系列测试接收机。

第一章序言 8第二章无线电的历史 10第三章超外差式接收机 14第四章单次变频超外差式接收机的实现 16第五章双重变频的实现 36第六章多重变频的实现 37第七章直接变频的实现 41第八章

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