The Czechoslovakian Military Radio Centre (VRÚ) in the UK. Its origins can be traced to September 1939, when it launched an experimental operation of a radio station located in a villa in the London suburb of West Dulwich. From September 1942 the VRÚ operated in new headquarters in Hockliffe near Bedford. It was here that one of its most important employees, Technical Sergeant Antonin Simandl, constructed transmitters ŠIMANDL and receivers MARJÁNKA for the needs of Czechoslovak paratroopers. The receiver from the MHI collection was used during the war by the Czechoslovak Military Mission in Tehran for communicating with the Ministry of Defence in London.