Four crystal diode switching circuit diagram of the IF filter

  
9-12V DC power applied to the control point A or point B, for amateur communication receiver IF amplifier, gives two different options. Power 455kHz, the bandwidth 500Hz, the f
Four crystal diode switching circuit diagram of the IF filter - schematic

requency of the crystal is not used should be 300 Hz CW, not 2.7kHz SSB bandwidth is 1.8kHz, 2.1kHz SSB bandwidth when not 1.25kHz.




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