The FBC-K series is a down-converter for use with 2-20GHz tuned receivers in a 1U 19" rack. The system consists of 3 RF channel inputs with 1 IF output. Channel selection is by TTL control.  

The FBC series is a downconverter for use as a frequency extender for noise figure measurement test systems in a 2U rack. RF frequencies are downconverted to an IF in the 4-18GHz range suitable for frequency extending any standard noise figure analyser.