The digitally-tuned, high-performance RKS-8000PP Pre/Postselector, is designed for operating with RKS-8000 and RKP-8100 system. RKS-8000PP permits the operation of collocated receivers and transmitters RKS-8000 or RKP-8100 R/T on frequencies separated by not less than 10%. When used with receivers the unit provides an additional front end selectivity stage. It rejects spurious outputs and broadband noise in the transmitted signal when used with transmitters.