Duxford Radio Trust

Interactive Wireless Museum

Preserving the history and technology of Radio Communications, Navigation and Radar

Researching, collecting, conserving, restoring and providing historic communications equipment for exhibition and demonstration to the public

Latest situation - DRT looking for a new exhibition home

See below for details

The Duxford Radio group provides the equipment, materials and knowledge for demonstration of the history, technology and application of radio communications, navigation and radar for the education of the public, mainly employing equipment used in military conflict and civil emergencies.

Below is a small selection of items from the DRT collection and a few details of our recent 'Interactive Wireless Museum' activities.

Working Wireless Set No. 22 Army handcart radio station for Infantry, Paratroopers and Commandos etc

Working replica RAF Lancaster Bomber Wireless Operators station - try your hand at Morse code

Working RAF H2S ground-mapping radar and static AN/APS-4 airborne Air-to-Surface-Vessel radar pod

Working complete ARC-5/SCR-274-N 'Command' radio installation as fitted to USAAF B17 and B24 aircraft

Who we are and what we do

The Duxford Radio Trust (DRT), is a registered not-for-profit charity, along with its wholly owned subsidiary Duxford Radio Ltd. (DRL), which is dedicated to preserving the history and technology of radio communications. We fulfill our public education obligations by providing the materials for public exhibitions of historic radio communications, navigation and radar artifacts, by active independent work in research, documentation, collection, conservation and restoration, by providing the licensed exhibition radio transmitting station G0PZJ/GB2IWM and by supporting/facilitating the historical and technical research, conservation and restoration of communications equipment by others. DRT/DRL publishes a four-monthly journal containing articles on specific historic equipment or communication related techniques. Copies of the Duxford Radio Journal are held in Cambridge University Library.

Today the DRT collection of Allied communications equipment is believed to rank only behind that of the IWM and RAF in historical and technical significance, and may be superior in some respects, in that it consists of complete equipment systems and is not a fragmented collection of individual/incomplete objects, consisting of random donations. Radio station G0PZJ/GB2IWM, owned by DRL, can operate single side-band (SSB) transmission, Morse code, amplitude modulation (AM) or frequency modulation (FM) as appropriate on the international HF and national VHF frequency bands, using both vintage and modern equipment to demonstrate radio communications in action, world-wide, to the public.

Examples of what we collect, conserve, restore and demonstrate to the public

Working WW2 'Monica' tail warning radar from Lancaster bomber on right, BC-221 Frequency Meter on left

Working WW2 RAF 'Gee' airborne navigation receiver on right and USA low frequency version 'LORAN' at left with 80 Volt 1500c/s power supplies

Working WW2 RAF R1392 VHF ground receiver at left and T1154/R1155 long-range Lancaster bomber radio at right

RAF Battle of BritainTR9D airborne Spitfire radio at left, matching T1422/R1224A ground radio station at right

Pye WS18, WW2 British Army field combat portable radio at top left, and various WW2 man portable and vehicle borne Army radio sets

Various WW2 clandestine radio equipment used by Resistance Groups, Secret Agents and Cold War 'Stay-behind' Resistance groups supported by the UK from 1948

Various Cold War radio equipment for British Army field combat use up to 2005 and items used by 'Stay-behind' Resistance groups supported by the C.I.A. from 1948

Radio battery charging in the field: robust 300 Watt petrol generator used on trucks and Armoured Fighting Vehicles.

Radio battery charging in the field: lightweight 80 Watt petrol generator carried by Jeeps, Mules and by Paratroopers, etc.

Radio battery charging in the field: man portable hand-powered generator for light weight man-pack sets

Radio battery charging in the field: steam powered generator for silent operation in jungle warfare

and much, much more

Some of our past activities

For 32 years the Duxford Radio Group successfully facilitated and supported the daily operation of the Volunteer Radio Section at the Imperial War Museums Duxford by providing free of charge, all equipment, materials, documentation and funding and also for the past 10 years by supervising a department of 37 suitably qualified, licenced and experienced IWM volunteer explainers, operating in daily roster teams, thus enabling the IWM Radio Section exhibition buildings and radio station to operate 6 days per week, demonstrating historic radio communications in action to the public.

From 1992 to 23 March 2020 the IWM Duxford Radio Section operated from Buildings 177 and 178 at the Duxford airfield site, located either side of the large Gibraltar Gun, and adjacent to the American Air Museum. Building 177 housed the exhibition radio transmitting station and a display of radio equipment principally with a land warfare theme, together with a working replica of the Wireless Operators position from the RAF Lancaster bomber. Building 178 was an interactive display and demonstration room, which housed a display of working conserved or restored radio, navigation and radar equipment principally with an aviation theme.

IWM has now closed the Duxford volunteer Radio Section and told DRT to remove all its equipment from the Duxford Airfield site without a valid reason.

How we do it

Conservation and restoration of large items of communications equipment such as the WW2 APS-4 airborne under-wing radar pod

Restoration of a small WW2 ARR-5 USAAF airborne surveillance receiver - effectively an airborne Hallicrafters S-27 - used for detecting enemy radar

Restoring the famous WW2 Pye Wireless Sets No. 19 and making them work well is always a struggle. WS19 needs 12 Volts at more than 25 Amps to start up

Example of item due for conservation/restoration

Plan Position Indicator No. 1 - radar operators console circa 1939/1940

Used on early VHF radar Chain Home Low (CHL) and later Ground Controlled Intercept (GCI) radar systems to display the position and bearing location of a target aircraft or ship.

In the Battle of Britain, the British 'Chain Home' radar network gave vital early warning of enemy attack, enabling the Spitfires and Hurricanes to get off the ground and meet the incoming threat. However, a particular limitation of the original Chain Home radar system was that due to the low frequency of operation and aerial structures employed, it could not detect low-flying aircraft.

At the time, the British Army was tasked with coastal defence activities and by using the VHF radar technology developed for Airborne Interception radar (AI) and Air-to-Surface Vessel (ASV) radar at Bawdsey Manor by the team led by Dr. Bowen, the Army developed a prototype coastal defence radar system to detect shipping and as an aid to gun targeting.

Once the potential of this version of early VHF ground radar was realised, Professor J. Cockroft (formerly of the Cambridge Cavendish Laboratory) and his Army team transported the prototype VHF coastal defence (CD) anti-shipping radar to Pye Ltd. at Cambridge.

Pye turned the prototype 200MHz radar design into a practical working system for coastal air defense which by then was needed to detect low flying German bombers (and submarines) and working with the Government scientists, first, 4, then 24 and finally 52 radar stations were installed to cover the entire UK coastline and called Chain Home Low (CHL).

Invicta Radio Ltd., a Pye subsidiary company, produced this example of the Plan Position Indicator No. 1 display console. In use a second console would have provided a range display.

The PPI display uses a 12 inch Cathode Ray Tube (CRT) with motor driven scan coils rotating around the neck of the tube in order to create the plan view map display with a moving trace which mirrored the rotation of the radar aerial.

Once this rare surviving unit is conserved and restored, the rotating scan coil system repaired and driven by the DRT radar computer simulation system, this unit will provide a unique working demonstration of early Second World War radar home defence technology and can be displayed along with the DRT Chain Home radar demonstrator.

Example of item due for conservation/restoration

Air Defence radar AA3 MK 7 1944 - 1968

This WW2 and Cold War era mobile anti-aircraft radar station, which was designed to control the Vickers 3.7 inch anti-aircraft gun, was last restored and repainted in 2006 when it received a bare-metal respray and overhaul in the workshops of the Duxford Aviation Society.

It is complete with 17KW diesel generator, all interconnection cables and target simulator equipment to enable it to operate without radiating microwave energy.

Since 2007 it has been waiting for IWM to marry it up with the IWM 3.7 Inch AA gun on display at Duxford, and now requires overhauling and repainting again.

Exhibition Radio Station

The main operating position of the exhibition radio communications station, which uses both vintage and modern equipment to demonstrate radio communications in action by talking to the world.

Equipment is available for the international HF shortwave bands and the national VHF and UHF bands using directional and omni-directional antennas.

Historic equipment configured for use includes Wireless Set No. 12 with R107 receiver, Wireless Set No. 19, T1154/R1155, Wireless Set No. 22 and receiver Type HRO. Other Larkspur, Clansman family and Bowman trial equipment is also available.

A Kenwood TS570DG kindly provided by Kenwood UK is available for HF SSB operation.

BBC TV filming our radio station in action

This programme appeared on national TV in 2018


Activities we have supported in the past at Duxford

  • Visits by the public to Duxford Radio Section by individual adults, families with children, either unscheduled or scheduled, on a daily basis (not normally on Saturdays)

  • Operation of two fully equipped radio communications exhibition buildings at IWM Duxford plus the permanent exhibition radio transmitting station G0PZJ/GB2IWM

  • Organised/scheduled group visits to Duxford Radio Section from schools, Cadet Forces, HMG Armed Services parties, tour party operators, special interest groups, etc.

  • Inside and outdoor exhibits for airshows and other flying displays

  • Historical and technical research, restoration service, advice and information on communications equipment to the staff of the Imperial War Museums and their customers

  • Activities we can support in the future with our collection of historic communications equipment

  • A licensed HF/VHF exhibition radio transmitting/receiving station with fully qualified operators.

  • Permanent or temporary, static or interactive, displays of historic radio communications equipment for exhibitions at museums or other events in the East of England.

  • Other public event days, including celebrations of world events and significant national anniversaries, commemorations and milestones.

  • Education S.T.E.M. related demonstrations, talks and lectures on radio communications, navigation, radar, cryptology and cypher.

  • Historical research into communications history and technology by individuals and organised groups/societies.

  • Conservation, restoration and maintenance of historic radio communications, radar and navigation equipment by DRT/DRL, other individuals and organised groups/societies.

  • Historical and technical research, restoration service, advice and information on communications equipment.

  • Publication of a historical-technical journal on radio communications, published 3 times per year. This is now archived in Cambridge University Library.

  • Loan of working or static communications equipment for film or TV applications.

Talking to the world - HF antenna for demonstrating long-range, world-wide radio communications.

The sun has now set on radio communications exhibitions and displays at IWM Duxford

September 2020 - DRT forced to leave IWM Duxford - looking for a new home

The future status of the Duxford volunteer radio section and DRT at IWM Duxford Airfield has been under discussion between DRT and IWM local management since late 2019.

Until 23 March 2020 DRT provided all equipment, materials, local management and administrative support to the IWM Duxford radio section for the static and interactive radio, navigation and radar exhibits, displayed for the benefit of IWM visitors, funded entirely by DRT/DRL. IWM provided the buildings and electricity. The team of radio section volunteers have supported IWM Duxford for the past 32 years, with some 36 communications specialist engineers and explainers, giving IWM Duxford between 6000 and 8000 volunteer hours per annum. As specialists, the hours contributed by the radio section volunteers were worth £350 per 8 hour day as National Lottery matched funding for IWM. The radio section attracted about 12,000 visitors each year at IWM and coached some 6000 children in Morse code each year among its diverse range of activities.

IWM Duxford management recently required all non-IWM employed parties on the Duxford site to become 'commercial partners' and agree to a detailed and onerous formal supply contract, which according to IWM Duxford management propaganda, was driven by 'the need for regulatory compliance, and instructions from Government Auditors'. The standard IWM commercial contract was impossible for DRT to comply with in its entirety for a number of reasons, some of which are mentioned below. To try to reach a mutually acceptable arrangement, the DRT trustees proposed a formal loan agreement that would continue to make available the unique DRT historic communications equipment collection to IWM and its visitors. Regrettably, this was rejected by IWM Duxford management, who insisted on treating DRT as a commercial organisation using the standard IWM commercial contract, despite the fact that DRT (like other groups on site) is a small, self-funded charity.

The most difficult aspect of the IWM contract requirements was for DRT to provide £10M public and £10M product liability insurance protection to IWM. Since 2009 this had always been provided by IWM on its general insurance policy via an annual subrogation certificate, in exchange for the old Duxford Radio Society, and later DRT, taking responsibility for health & safety risk assessments and management/supervision/team leadership of IWM volunteers, rather than IWM staff performing this role. Such insurance proved difficult for DRT to arrange during the COVID-19 lock-down period and was further complicated by some very specific terms and conditions insisted on by IWM, concerning the decisions on who would be permitted to operate and take responsibility for DRT radio equipment. In any event, DRT could not legally comply with this condition due to the ITU/OFCOM radio regulations and health & safety. After much dialogue with IWM Duxford management, eventually these conditions were eased slightly and on 9July 2020 an insurance quotation was obtained by DRT. The activities of DRL and the exhibition radio station were already separately insured via the Radio Society of Great Britain.

However, on 13 July 2020, the trustees were advised that despite finally obtaining the IWM required insurance cover, it was too late, there was no place for DRT at IWM Duxford and no agreement would be made for DRT to remain there. The trustees were formally instructed to remove all the DRT radio, navigation, and radar exhibits and equipment from the site, and that the IWM Duxford volunteer radio section would be closed. No valid reason has been given for this by the IWM commercial department. IWM Senior management verbally advised DRT that it was 'small fry and of no consequence to IWM'. It is important to record that the most recent written review of the Duxford volunteer radio section and DRT/DRL performance (Dec 2019) by the IWM Lambeth volunteer department head was full of praise and expressed a desire to expand and promote the DRT activity. IWM department of commerce and operations is now pressurising DRT to rapidly remove all historic communications equipment from the Duxford site.

The radio section volunteers have served and supported the IWM at Duxford on an almost daily basis for 32 years, providing the historic radio communications, radar and navigation expertise and complete historic communications systems for the benefit of the public. They have designed and developed interactive exhibits in their own time and at their own expense for the education of the public, to support the S.T.E.M. education syllabus and also to inspire children to take up technology and science in the future. The radio section also provided a great attraction for military veterans and their families who were able to enjoy a hands-on experience once again with the field equipment which they or their parents had used in the past.

With the value of each square metre of the Duxford site recently being costed as worth £52, in reality, it would appear that financial considerations have now taken precedence over the history and applications of radio communications in military conflict and civil emergencies at IWM Duxford.

The DRT trustees, who also serve as IWM volunteers, are all incredibly sad to be forced to close the public exhibition and leave IWM Duxford after such a long and successful period of service to the museum. They also apologise in advance for the disappointment to the many visitors who pay to enter IWM Duxford specifically to visit the radio section.

The DRT trustees continue to believe that IWM Duxford is the best location to display, demonstrate and explain its collection of complete, working, historic military radio equipment systems for the education of the public, in order to tell the story of communications in military conflict and civil emergencies. DRT has the most comprehensive publicly available collection of working, historic communications equipment in the UK.

The Duxford Radio Trust wishes IWM Duxford every success in the future.

Duxford Radio - origins 1984 - 1986

The Duxford Radio group activity was originally co-founded by Major John Brown, the designer of the "B2 Suitcase Set" (and many other items of radio equipment used for espionage and other clandestine purposes during WW2) and by Richard Pope a radio engineer from the Civil Aviation Authority.

This activity stems from June 1984 when Richard Pope, G4HXH met up with Major John Brown, G3EUR at Duxford Airfield. John Brown had organised an informal association of Special Forces Signals Groups to operate a special event radio station to commemorate the 40th Anniversary of 'D' Day.

In May 1985 when a similar group met and operated radio station GB4SOE for the 40th Anniversary of 'VE' Day, it was remarked that despite the various air displays, military vehicle displays, and the Imperial War Museums future intent to restore the WWII RAF Operations Room at Duxford, there was a forgotten side of the Second World War. Namely, how did all those people in the Armed Forces communicate with one another to get the orders and information back and forth to those on the front line, on land, sea and air? Radio communications (called wireless at the time) was of course the answer, but to what extent was this acknowledged or reflected in museum circles? Museums tend to focus on large structural objects such as aircraft, tanks, trucks, ships, trains - although they purport to be telling the story of the people concerned - and often fail to deal with the details of the field equipment used by people in action.

The years 1939-45 saw great strides made in radio and electronics with many new concepts and inventions; VHF radio communications, Radar, I.F.F, and the GEE navigational system are just a few, but in the UK these events were not celebrated in any significant way in 1985.

Duxford Radio - evolution 1986 - 1992

In September 1986 it was agreed with IWM that the Duxford Airfield Radio Society (D.A.R.S.) would provide a restoration service to IWM, exhibit its own radio equipment for public display to IWM customers and operate an amateur radio transmitting station GB4SOE, for which D.A.R.S. later obtained the radio license G0PZJ/GB2IWM.

Major John Brown contributed key items of clandestine radio equipment designed by him during the war, and Richard Pope, a serious collector of military radio equipment led the development of a collection of historic equipment and materials.

During this time a group of both local and distant supporters was developed who provided materials, equipment and funding to sustain the group's operation.

The Duxford Radio Society (DRS) was formed in July 1989, as an unincorporated association governed by a constitution and funded by its members.

In 1992 the Imperial War Museum Duxford provided two small buildings (numbers 177 & 178) on a permanent basis and permitted the positioning of outside radio aerials which were usually physically installed by the evolving Duxford Airfield Fire Brigade.

Duxford Radio - development 1992 - 2009

In 1992 IWM Duxford decided that the Duxford Radio Society (DRS) should become the Radio Section of the Duxford Aviation Society (DAS). During this period the group extensively developed its equipment collection and conservation/restoration activities in order to conserve, restore, exhibit and demonstrate radio communications in action to the public visiting IWM Duxford. The Duxford Radio group was fully supported by DAS for health & safety and other essential functions. DRS provided technical, historical and electronic engineering support to various IWM departments.

Duxford Radio - change 2009 - 2017

In April 2009 at the request of IWM Duxford management, because the DAS Radio Section formed a 'Front of House' public-facing explainer activity on the IWM Duxford airfield, the DAS volunteers were told by IWM to become registered IWM volunteers to form an IWM Duxford Radio Section. However, after following this change, from April 2009 to April 2017, the Radio Section volunteers were not assigned to an IWM staff department and were obliged to take responsibility for their own organisation, administration, care, well-being and health and safety. The Duxford Radio Society continued to provide all radio communications equipment and direct funding for the IWM Duxford Radio Section until 2017.

Duxford Radio - restructuring 2017 -2020

In 2017, in anticipation of IWM Duxford's new strategic plan with a changing IWM approach to on-site partners, and in order to protect the historic equipment collection and the personal liability of the individuals, the assets and activities of the Duxford Radio Society were transferred into a trust. The Duxford Radio Trust was then registered as a Charitable Incorporated Organisation (CIO) and a wholly owned trading subsidiary, Duxford Radio Limited, was formed for the radio station activities. From April 2017 to 23 March 2020 (when IWM Duxford closed to the public) the Trustees and Directors of Duxford Radio Trust and Duxford Radio Ltd continued to provide all materials, direct funding, scheduling, administration and health & safety supervision for IWM volunteers in the Duxford Radio Section. As of July 2020 the IWM Radio Section is now closed and DRT/DRL have been told to leave the site. Consequently, DRT is looking for a new exhibition home, and the extensive collection of historic communications equipment will be placed into safe storage.