The BFCN-1690 from Mini Circuits is a Space Qualified RF Filter with Frequency 1.57 to 1.81 GHz, Center Frequency 1690 MHz, Stop Band Frequency DC to 4400 MHz, Power 1 W, Insertion Loss 2.5 to 5 dB. Tags: Surface Mount. More details for BFCN-1690 can be seen below.