SOFTWARE-DEFINED COMPACT RADIOS (SCRs) SCR-100 (S-BAND UPLINK/DOWNLINK) SCR-104 (L-BAND & S-BAND UPLINK/S-BAND DOWNLINK) SCR-106 (S-BAND UPLINK/X-BAND DOWNLINK) SCR-108 (S-BAND UPLINK/K-BAND DOWNLINK)