page_title: Trevor Wadley
section_title: Ionosonde
hierarchical_section_title: Trevor Wadley / Ionosonde
caption_attribution_description: Deutsch: Radio Barlow Wadley XCR-30, selbst fotografiert, Lizenz: GNU-FDL Français&#160;: Radio Barlow Wadley XCR-30, bande 0,5 à 30 MHz AM et BLU + bande FM en option. La sélectivité est de 6kHz en AM, la sélectivité est de 3kHz en BLU et CW.
context_page_description: Trevor Lloyd Wadley, was a South African electrical engineer, best known for his development of the Wadley Loop circuit for greater stability in communications receivers and the Tellurometer, a land surveying device.
context_section_description: At the CSIR he developed a device called an ionosonde for measuring the Earth's ionosphere. It is a specialised form of a radar detector used to measure the height of the ionised layers of air between 50 and 600 kilometers. This information gives insight into what is occurring during an ionospheric storm. The ionosonde was used to provide a transmission frequency prediction service to the SABC, the South African Postal Service (SAPO) and South African Military.
caption: Wadley receiver (Barlow Wadley XCR-30)
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