The QBF-400-700-50 from Qualwave is a Band Pass Filter with Frequency 400 to 700 MHz, Bandwidth 300 MHz, Center Frequency 550 MHz, Insertion Loss 2.5 dB, Upper Rejection 50 [email protected] to 1 GHz. Tags: Module with Connectors. More details for QBF-400-700-50 can be seen below.