RAFTER was a code name for the MI5 radio receiver detection technique, mostly used against clandestine Soviet agents and monitoring of domestic radio transmissions by foreign embassy personnel from the 1950s on. == Explanation == Most radio receivers of the period were of the AM superhet design, with local oscillators which generate a signal typically 455 kHz above or sometimes below the frequency to be received.
RAFTER was a code name for the MI5 radio receiver detection technique, mostly used against clandestine Soviet agents and monitoring of domestic radio transmissions by foreign embassy personnel from the 1950s on. == Explanation == Most radio receivers of the period were of the AM superhet design, with local oscillators which generate a signal typically 455 kHz above or sometimes below the frequency to be received.
Source: Wikipedia "Operation RAFTER" · CC BY-SA 4.0
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