0312

File Title 'C', Chief of the Secret Intelligence Service (SIS): Wireless Communications; General
Reference FO 1093/312
Date 17 April 1940 - 23 December 1940
Government Department Foreign Office
File Accession Date 23 May 2013

Description

A file of correspondence discussing wireless communications and interception. Subjects discussed in this file include the introduction of a new scrambling device on German international telephone lines, and the necessity of funding a British counter-measure; a vast increase in Secret Intelligence Service (MI6) radio traffic due to the expansion of the Special Operations Executive (SOE), and the need to expand the existing clandestine wireless facilities; and the problems caused by a shortage of trained wireless operators.

Document Title Date
i Front Cover Download PDF (392 KB)
1st 'C', Chief of the Secret Intelligence Service (SIS): Wireless Communications; General Download PDF (5.97 MB)
ii Back Cover Download PDF (352 KB)
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