SAT Corp., a wholly owned subsidiary of Integral Systems Inc., announced Sept. 21 that it has delivered its digital spectrum analyzer, SAT-DSA, to Northrop- Grumman. SAT-DSA is a digital spectrum analyzer tailored for the satellite communications industry. The system provides automatic monitoring of multiple uplink and downlink signals and includes the ability to: automatically detect, characterize and display interfering signals; access historical spectral data and signal characteristics, as well as support remote user access.