This filter comes from the Progressive Communications Receiver (November 1981 QST & The ARRL 1986 Handbook). The values given are for 20 meters.
Designed for 50 ohm input and output. Spread the wires over the coil form evenly with a 30 degree gap between the ends. Mica or polystyrene capacitors are recommended. Smaller values can be combined to reach the values specified in the diagram.
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