The QBF-310-443-50 from Qualwave is a Band Pass Filter with Frequency 310 to 443 MHz, Bandwidth 133 MHz, Center Frequency 376.5 MHz, Insertion Loss 1 dB, Upper Rejection 50 [email protected] to 1.5 GHz. Tags: Module with Connectors. More details for QBF-310-443-50 can be seen below.