RF Band Pass Filters

A band pass filter (LPF) is used at the front end of a receiver, to attenuate strong out-of-band signals. Strong signals that reach the receiver’s first mixer and/or RF pre-amplifier cross-modulate and produce unwanted spurious responses at the receiver output

Design Details

• Double-tuned circuit filter
• QRP Labs design - Commercially available at reasonable cost
• Based on The double-tuned Circuit: An experimenter's tutorial

Schematic

Parts