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| Wireless Set No. 11 | |
|---|---|
| Name | Wireless Set No. 11 |
| Introduced | 1939 |
| Manufacturer | Marconi Company |
| Frequency | 1.5–7.5 MHz (HF) |
| Mode | AM/CW |
| Power | 8 W |
| Range | up to 25 miles (vehicular), 100+ miles (aerial) |
| Weight | ~30 kg (transceiver) |
| Country | United Kingdom |
Wireless Set No. 11
The Wireless Set No. 11 was a British World War II-era radio transceiver developed for tactical communications among British Expeditionary Force, Royal Air Force, Royal Navy, Home Guard, and Commonwealth formations including Australian Army and Canadian Army. Designed by engineers from the Marconi Company in collaboration with the Ministry of Supply and tested by units of the War Office, it became a standard short‑range high-frequency set used in vehicles, on bicycles, in command posts, and in aircraft liaison roles across European, African, and Pacific theatres.
Development began in 1938 as part of pre-war rearmament driven by planners from the War Office and the Air Ministry after lessons from the Spanish Civil War and signals reviews prompted by the Aden Emergency and earlier colonial policing. Engineers at the Marconi Company worked with technicians from the Telecommunications Research Establishment, the Royal Signals, and contractors linked to the Ministry of Supply to produce a ruggedised set that balanced portability with performance for formations such as the British Expeditionary Force and units preparing for operations alongside the French Army and later the Polish Armed Forces in the West.
The design incorporated valve technology common to equipment used by the Royal Navy and Royal Air Force and borrowed circuit techniques from earlier Marconi sets deployed during the First World War era retrofits and interwar experiments by the Signals Experimental Establishment. Ruggedisation standards were influenced by specifications issued after field trials with the Territorial Army and feedback from brigades operating in the Norwegian Campaign and the North African Campaign.
The transceiver operated in HF bands roughly between 1.5 MHz and 7.5 MHz using amplitude modulation (AM) and continuous wave (CW) modes, drawing design precedent from sets used by the Royal Australian Air Force and the South African Army in combined operations. Power output was approximately 8 watts RF from valve amplifiers similar to types used in contemporaneous equipment fielded by the United States Army Signal Corps and the Soviet Red Army under lend‑lease comparisons.
The chassis housed transmitter, receiver, and power supply modules arranged for rapid replacement, reflecting maintenance philosophies promoted by the Royal Electrical and Mechanical Engineers and the Ministry of Supply depot system. Antenna options included long‑wire and whip aerials compatible with vehicular installations used by units attached to the 1st Armoured Division and headquarters elements of the 8th Army. Interfacing jacks followed patterns adopted by the Army Signal Corps (United States) for headset and keying equipment, while filters and tuning circuits mirrored practices in sets evaluated at the Telecommunications Research Establishment.
The set entered service in 1939 and saw first operational use during the Battle of France with wireless detachments attached to retreating elements of the British Expeditionary Force. It remained in widespread use through campaigns including the North African Campaign, Operation Overlord, and operations in the Burma Campaign. Crews from the Royal Signals relied on the set for brigade and divisional liaison alongside radios supplied to formations of the Canadian Army and the New Zealand Expeditionary Force.
Operational evaluations conducted after engagements such as the Siege of Tobruk and the Italian Campaign prompted incremental field modifications advocated by signal officers from the 21st Army Group and the Mediterranean Allied Forces. Its performance under desert, arctic, and jungle conditions influenced replacement schedules within the War Office Equipment Programme and informed procurement choices comparing it to sets like those used by the United States Army Air Forces and sets supplied under Lend-Lease to allies including the Free French Forces.
Field variants included vehicle‑mount, man‑pack, and air‑to‑ground configurations adopted by units ranging from the Royal Engineers to the Fleet Air Arm. Modifications created in workshops of the Royal Electrical and Mechanical Engineers and civilian firms in the British Empire produced hardened connectors and revised tuning assemblies inspired by lessons from the Norwegian Campaign and tropical trials in Ceylon.
Specialised adaptations for airborne liaison mirrored developments used in radios aboard aircraft of the Royal Air Force and the United States Army Air Forces, and some units were modified with crystal control in the manner seen in sets supplied to the Free Polish Air Force. Post‑war, surplus sets were retrofitted by engineers from the Post Office and by firms servicing colonial forces in Malaya and Kenya.
Primary users included the British Army, Royal Air Force, and Royal Navy for shore/air liaison, with extensive use by Commonwealth forces such as the Canadian Army, Australian Army, and New Zealand Army. Allied recipients under cooperative arrangements included the Free French Forces, elements of the Polish Armed Forces in the West, and formations operating with the Mediterranean Allied Air Forces.
The set was also used by paramilitary and auxiliary organisations like the Home Guard and by colonial constabularies in territories including Egypt, Palestine (British Mandate), and British Guiana until replaced by newer equipment during post‑war rearmament programmes led by the Ministry of Supply and the United Kingdom defence establishment.
The set influenced post‑war British transceiver design philosophies implemented by companies such as the Marconi Company and incorporated into communications doctrine promulgated by the War Office and later the Ministry of Defence. Lessons from its operational use informed development programmes at the Signals Research and Development Establishment and improved interoperability standards used in NATO projects during early Cold War planning involving the North Atlantic Treaty Organization.
Surviving examples are preserved in collections at institutions including the Imperial War Museum, the National Army Museum (United Kingdom), and private collections exhibited by societies dedicated to the history of radio communication and military signals, where they illustrate technological continuities between interwar, World War II, and Cold War communications systems. Category:World War II British military equipment