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The AN/ALR-69 radar warning receiver (RWR) was developed as an update of the AN/ALR-46 for aircraft use. The improvements involved the addition of a frequency-selective receiver system (FSRS) and a low-band missile alert receiver designated the AN/ALR-64 Compass Sail.

Surface-to-air missiles (SAMs) are detected by the ALR-69 via the radar emissions from their guidance systems. The FSRS tracks high-frequency emissions and the Compass Sail tracks low-band systems. Threat warning and...

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