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. |
Send E-Mail || Amateur Radio Receivers || Super Receiver || Super Receiver Circuit Details