[quote=电磁波fm]请问输入mc3361的第一中频信号是否只能为10.7m,不能为其他频率?
或者说是否可以通过改变mc3361的本振与一个非10.7m的第一中频信号差出一个455khz?
若能改变,请问频率范围可以是多少?
3361的典型电路上是用10.7m的第一中频和10.245m的本振.
谢谢大家了![/quote]
the mc3361b includes an oscillator, mixer, limiting amplifier,
quadrature discriminator, active filter, squelch, scan control and mute
switch. this device is designed for use in fm dual conversion
communications equipment.
• operates from 2.0 to 8.0 v supply
• low drain current 3.9 ma typical @ vcc = 4.0 vdc
• excellent sensitivity: input limiting voltage –3.0 db = 2.6 mv typical
• low number of external parts required
• operating frequency up to 60 mhz
