The beam war becomes operational
British scientific intelligence had identified Knickebein before the Blitz began. By the autumn the contest had moved through successive German navigation systems, including X-Gerät, whose narrow beams and timed signals could place pathfinders over an inland target in darkness. Countermeasures combined listening, technical analysis, jamming and the transmission of misleading signals. R. V. Jones was an important organiser and interpreter of the intelligence, but the work depended on aircrew, radio specialists, the Telecommunications Research Establishment and operational stations that had to turn a scientific deduction into a usable defence. The…
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