The PDBF-1R275/1R475-6C4 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 1.27 to 1.48 GHz, Center Frequency 1.38 GHz, Insertion Loss [email protected], Rejection =40 dB @0.95&1.95 GHz, Upper Rejection 40 dB. Tags: Surface Mount. More details for PDBF-1R275/1R475-6C4 can be seen below.