Modulator and sub-modulator unit from Daventry short-wave transmitter

Made:
1932 in United Kingdom
Modulator and sub-modulator unit from modulation transformer Modulator and sub-modulator unit from modulation transformer Modulator and sub-modulator unit from modulation transformer Modulator and sub-modulator unit from modulation transformer Modulator and sub-modulator unit from modulation transformer

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

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License this image for commercial use at Science and Society Picture Library

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Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

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License this image for commercial use at Science and Society Picture Library

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Modulator and sub-modulator unit from modulation transformer
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Modulator and sub-modulator unit from modulation transformer
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Modulator and sub-modulator unit from modulation transformer
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Modulator and sub-modulator unit from modulation transformer
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Modulator and sub-modulator unit from modulation transformer
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Modulator and sub-modulator unit from modulation transformer taken from the original short-wave transmitter at Daventry, made by Standard Telephones and Cables Limited for the British Broadcasting Corporation, 1932.

These units were taken from the first short-wave radio transmitter to be installed at Daventry in 1932. Radio transmissions had been made from Daventry since 1925, but the shortwave receivers were installed specifically for broadcasting radio programmes to the Empire via the Empire Service (later the BBC World Service). Four two-hour programmes were provided daily, broadcasting initially only in English to Australia and New Zealand, India, East and Southern Africa, West Africa and Canada. On the first day of the Empire Service, Sir John Reith, the first Director General of the BBC, gave the Empire Service’s opening address. His speech included a warning about the quality of the new service: "Don't expect too much in the early days; for some time we shall transmit comparatively simple programmes, to give the best chance of intelligible reception.”

Details

Category:
Radio Communication
Object Number:
1970-44
Materials:
metal (unknown), glass, plastic (unidentified) and electronic components
type:
rf modulator
credit:
Donated by the British Broadcasting Corporation.

Parts

STC 4212 E triode valve from Daventry short-wave transmitter

STC 4212 E triode valve from Daventry short-wave transmitter

Materials:
metal (unknown) and glass
Object Number:
1970-44 Pt1
type:
thermionic valve
Modulator and sub-modulator enclosure from Daventry short-wave transmitter

Modulator and sub-modulator enclosure from Daventry short-wave transmitter

Object Number:
1970-44 Pt3
type:
enclosing structural element
Modulation Transformer from Daventry short-wave transmitter

Modulation Transformer from Daventry short-wave transmitter

Modulation Transformer Serial No. 81480 by Ferranti from Daventry short-wave transmitter, made by Ferranti Limited, Hollinwood, 1925-1970

Measurements:
overall: 320 mm x 350 mm x 240 mm, 25kg
Object Number:
1970-44 Pt4
type:
transformer