The MPQ-10 was replaced in 1958 by the AN/MPQ-4. The MPQ-4 built by General Electric, was a dual beam rapid scan radar using vacuum tube technology, an analog computer, mechanical scanning, and unsophisticated extrapolation techniques. The AN-MPQ-4 operated successfully, as a mortar locating radar; but, its ultimate performance was limited by its need for constant operator alertness, limited multiple target handling capability, and its significantly degraded performance in rain. The MPQ-4 was used in a limited capacity against hostile artillery in VIETNAM.
5/4 Arty had a platoon of radar operators and a big radar sited on C-2. They linked in directly to a near by firing battery and I presume they called for fire on rocket launch sites. The rocket kept coming.
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