PHPWIND
HELLOCQ
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BA2Bi:FM....AM... 455k 滤波器就很多....50K 10K 5K 1K............ (2014-02-15 22:54)
王雷生:有没有455 500HZ的滤波器 (2014-02-16 13:36)
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BG0APD:AM IF大致在5-6KHz,也有例外,比如WS423电子管收信机,为了追求好音质,AM带宽达到13KHz。 (2014-02-15 20:27)