The QBF-1050-1900-50 from Qualwave is a Band Pass Filter with Frequency 1.05 to 1.9 GHz, Bandwidth 850 MHz, Center Frequency 1475 MHz, Insertion Loss 1.5 dB, Upper Rejection 50 [email protected] GHz. Tags: Module with Connectors. More details for QBF-1050-1900-50 can be seen below.