The QBF-4300-8200-50 from Qualwave is a Band Pass Filter with Frequency 4.3 to 8.2 GHz, Bandwidth 3900 MHz, Center Frequency 6250 MHz, Insertion Loss 1.5 dB, Upper Rejection 50 [email protected] to 10 GHz. Tags: Module with Connectors. More details for QBF-4300-8200-50 can be seen below.