The 6C9-1621.25-X10.5T11 from Reactel is a cavity bandpass filter for the Iridium Satellite system. This airborne BPF has a passband from 1616 to 1626.5 MHz and a center frequency (Fc) of 1621.25 MHz. It is specifically designed with a narrow bandwidth and high rejection to isolate Iridium frequencies from outside interference due to Inmarsat systems and utilizes a special plating process. It has an insertion loss of less than 3.3 dB and a rejection of over 25 dB above and below the band. The filter is available in a module that measures 1.5 x 4.5 x 6.3 inches with TNC (F) connectors.