CCS A-7
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.
Pictures
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incomplete trace is an artifact of photography
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The mixer (black module) extends the range of the SA to 1.5 GHz from 500 MHz
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1401 chassis, side
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1401 chassis, bottom
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modified MR501, left
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modified MR501, right