BCB Reject Filter
 
This design for an effective Broadcast Band  Reject filter came from an old commercially made Antenna Multicoupler.  I used it in the Active Multicoupler I built and it worked well.  (See the  KO6BB Multicoupler elsewhere) 

Unlike the usual Low Pass Filter (LPF) this one will pass signals both below and above the Mediumwave Broadcast Band, allowing Longwave and Shortwave reception while eliminating Intermodulation problems from strong Broadcast stations. 
The unit should be built in a metal shielded box and connected between the antenna and the receiver with 50 Ohm coax cable.

The input/output impedance is 50 Ohms.
COMPONENT VALUES

    L1, L3     12.2uH

    L2           4.65uH

    C1, C5    2000pF

    C3           6200pF

    C4           22pF

Melt Some Solder!
   
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