page_title: Airport surveillance radar
section_title: ASR-7
hierarchical_section_title: Airport surveillance radar / Types / ASR-7
caption_attribution_description: English: Airport Surveillance RADAR, Model 7, PPI Display Monitor (Operator controls and display unit), Uses 15 inch round CRT with P7 phosphor, accelerating voltage 12KV. Electromagnetic deflection. Vector monitor with in-built PPI sweep generator and control circuitry for ASR-7 radar transmitter-receiver. FAA designation FA-8968, NSN 6625-01-022-3203, Prime manufacturer: Raytheon (This specimen by Cardion Electronics unit of General Signal, Woodbury, NY.
context_page_description: An airport surveillance radar is a radar system used at airports to detect and display the presence and position of aircraft in the terminal area, the airspace around airports. It is the main air traffic control system for the airspace around airports. At large airports it typically controls traffic within a radius of 60 miles of the airport below an elevation of 25,000 feet. The sophisticated systems at large airports consist of two different radar systems, the primary and secondary surveillance radar. The primary radar typically consists of a large rotating parabolic antenna dish that sweeps a vertical fan-shaped beam of microwaves around the airspace surrounding the airport. It detects the position and range of aircraft by microwaves reflected back to the antenna from the aircraft's surface. In the US the primary radar operates at a frequency of 2.7 - 2.9 GHz in the S band with a peak radiated power of 25 kW and an average power of 2.1 kW.
context_section_description: This is an obsolete system that is completely out of service.
caption: An ASR-7 Operator control panel and display as used in 1981. The unit uses a 15 inch P7 CRT having a non-rotating deflection yoke, vector monitor technology, and built-in electronics to provide drive signals for the familiar rotating PPI sweep.
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