Abstract: An emulator for a radar set which utilizes a conventional personal computer rather than specialized equipment. The emulator comprises a printed circuit board and a program for operation of the computer. The computer calculates the data for one antenna scan and stores it in a memory bank on the board; as this is being read out as radar video which is displayed on the screen, the computer calculates the data for the next scan and stores it in a second memory bank on the board. In this way a continuous series of scans is presented without requiring the extensive computational power that would be required to display a scan as it is being calculated.