Didactic Primary Radar DPR 886

The Didactic Primary Radar (DPR 886) is an experimental S-band radar system operating between 2.4 and 2.7 GHz, developed by Intersoft Electronics and Köster Systemtechnik as the core component of the Sky-Radar teaching system. It is a fully operational radar designed for both outdoor deployment and classroom use, featuring an instrumented range of 150 meters, a range resolution of 1.5 meters, and an accuracy of 30 centimeters. The system employs pulse compression with phase-coded transmitter signals, including Barker codes, to achieve sufficient range and signal quality for educational purposes with minimal, human-safe transmission power. Its 6-degree beamwidth antenna can be manually controlled or follow pre-configured trajectories, with all radar functions controllable via a laptop or network, allowing for real-time observation of A-Scope and B-Scope visualizations. The DPR 886 facilitates experimentation with radar parameters such as pulse width (from 20 nanoseconds to 0.5 microseconds), receiver bandwidth, pulse repetition frequency, and carrier frequency, enabling demonstrations of concepts like the Doppler dilemma, blind speeds, and the relationship between pulse width and necessary receiver bandwidth. A limitation of the system is the absence of a slip-ring unit in its turntable, which prevents 360-degree volume searches and the realization of a Plan Position Indicator (PPI) screen.

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