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The CC Systems A-7 is a "Panoramic Surveillance Receiver" in a TM515 mainframe. It is apparently built around a Tektronix 1401 spectrum analyzer chassis with a custom mixer front-end extending the 1401's 1-500 MHz range to the 500-1000 and 1000-1500 MHz ranges. The display section is a modified Tektronix MR500 monitor plug-in.