No. 90 Signals Unit

No. 90 Signals Unit
Unit name	No. 90 Signals Unit
Type	Signals
Role	Communications, Electronic Warfare

No. 90 Signals Unit No. 90 Signals Unit was a specialised signals formation associated with long-range communications, electronic warfare and tactical signal support. The unit operated in conjunction with strategic formations and allied commands, providing cryptographic, radio, and satellite link capabilities. Its activities linked with air, naval, and land operations, interfacing with NATO, intelligence agencies, and defence research establishments.

History

The unit traces origins to interwar signals developments influenced by figures such as Alan Turing, T. E. Lawrence, William Roy (surveyor), and institutions like Bletchley Park and the Royal Air Force signals branches. During the Second World War its antecedents worked alongside formations involved in the Battle of Britain, Operation Overlord, and Mediterranean campaigns including Operation Torch. Cold War reorganisation connected the unit with NATO structures including Supreme Headquarters Allied Powers Europe, Royal Navy communications groups, and the United States Navy task forces during crises such as the Cuban Missile Crisis and the Berlin Crisis of 1961. In the late 20th century technological shifts tied it to programmes at Cheltenham signals facilities, the Signals Research and Development Establishment, and equipment trials with firms like Marconi Company and Racal. Deployments during conflicts such as the Falklands War, Gulf War, and post-9/11 operations reflected evolving doctrine shaped by reports from Ministry of Defence (United Kingdom), liaison with the United States Central Command and interoperability studies with the North Atlantic Treaty Organization.

Role and Responsibilities

The unit provided strategic communications links for air operations linked to formations like Air Command and maritime coordination with the Fleet Air Arm and Carrier Strike Group elements. Responsibilities encompassed secure voice and data circuits employed by headquarters such as Permanent Joint Headquarters, secure relay services used by embassies including postings of the Foreign and Commonwealth Office, and coordination with signals intelligence collectors such as Government Communications Headquarters and National Security Agency. It supported cryptographic key distribution associated with standards from NATO Communications and Information Agency and conducted spectrum management tasks aligning with the International Telecommunication Union and defence frequency allocation authorities. The unit also contributed to electronic warfare suites used by aircraft like the Panavia Tornado, Eurofighter Typhoon, and platforms operated by Royal Navy frigates and destroyers.

Organisation and Structure

Organisationally the unit was aligned beneath larger corps elements such as the Royal Corps of Signals or integrated into joint formations under Joint Forces Command. Its internal structure mirrored signal regiment frameworks with wings or squadrons responsible for tactical, strategic, and maintenance roles, liaising with test centres including the Defence Evaluation and Research Agency and QinetiQ. Command relationships extended to joint task forces and coalition headquarters including Multinational Force Iraq and International Security Assistance Force. Training and personnel pipelines crossed with establishments such as Royal Military Academy Sandhurst, Royal Air Force College Cranwell, and apprentice schemes tied to the Defence Sixth Form College and specialist signals schools.

Equipment and Technology

Equipment suites incorporated terrestrial radio systems like those developed by Racal, satellite terminals compatible with constellations such as Inmarsat and military satellite services used by Skynet (satellite), secure telephony and data multiplexer equipment from vendors comparable to Harris Corporation and Thales Group, and line-of-sight microwave radios employed by expeditionary forces. The unit fielded electronic countermeasure hardware interoperable with airborne systems used by Lockheed Martin and Boeing platforms, and supported cryptographic modules following standards championed by organisations like NATO Communications and Information Agency. Test and calibration were conducted using instrumentation models from Rohde & Schwarz and laboratory facilities mirrored at the Signals Research and Development Establishment.

Operations and Deployments

Operational deployments ranged from permanent garrisons supporting NATO at bases such as RAF Akrotiri, RAF Lossiemouth, and Gibraltar, to expeditionary detachments in theatres including the Falklands Islands, the Persian Gulf, and Afghanistan during ISAF operations. The unit provided communications during humanitarian missions coordinated with United Nations contingents and disaster relief efforts alongside agencies like Department for International Development (United Kingdom). Coalition interoperability efforts saw the unit integrate with United States Central Command task forces, NATO Response Force rotations, and bilateral exercises with partners including French Armed Forces, German Bundeswehr, and Australian Defence Force.

Personnel and Training

Personnel were drawn from specialist cadres trained in cryptography, radio engineering, satellite communications, and electronic warfare, receiving instruction at institutions including the Royal School of Signals, Defence College of Technical Training, and allied exchanges with United States Naval Academy technical branches. Career progression aligned with professional qualifications recognised by bodies such as the Chartered Institute of Information Security and secondments to research organisations such as Defence Science and Technology Laboratory. Exchanges and joint exercises included participation with units from Canada, New Zealand, and Norway to maintain interoperability and doctrine currency.

Category:Signals units