Combat DF Block 0 (AN/SRS-1) was an electronic support, signal acquisition, and direction-finding system that provided at sea commanders with near-real-time indications and warning, situational awareness, and cueing information for targeting systems.
Combat DF greatly improved on existing “Outboard” system technology by providing greater flexibility against a wider range of threat signals and increased reliability at lower cost through use of Commercial Off-The-Shelf workstations. The system incorporated the Automated Digital Acquisition Subsystem upgrade enabling exploitation of unconventional and low-probability-of- intercept signals.
The Block 1 was a Full-Rate Production installed on new construction Wasp (LHD-1) and Arleigh Burke Flight II (DDG-72 and follow-on) class ships was well as back fitted on LHDs and DDG-51s.
In 2000, Combat DF was superseded the Cooperative Outboard Logistics Update (COBLU) Phase 1 system during construction of DDG-51 class destroyers. COBLU provided an even greater level of capability for processing modern signal modulations.
Station HYPO 
27 August 2022 at 05:01
I was an OUTBOARD II maintenance technician while on Active Duty until 2000. As a civilian contractor, I provided program support to the SPAWAR manager of the Combat DF system (installations/ development). A fascinating couple of years for me working with SPAWAR and NAVSEA, but as COBLU came online, the challenge became halting the CDF installations on newly constructed ships and planning how to integrate COBLU into all the DDGs.
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