You are correct that radar systems were developed and used before computers were widely available. In early radar systems, the signals received by the radar were displayed on a cathode ray tube (CRT) or oscilloscope, which could be used to manually interpret the data.

However, as radar technology advanced and the amount of data that radar systems could collect increased, the need for computers to help process and analyze the data became apparent. In modern radar systems, the computer plays a central role in signal processing and target tracking, using algorithms to analyze the radar data and extract useful information about the location, speed, and other characteristics of the objects being tracked.

So while it's possible to build a simple radar system that does not require a computer, modern radar systems are heavily reliant on computers for data processing and analysis.
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