Preparations The Australasian Antarctic Expedition (AAE) was the first such endeavour in history, and the only one during the
Heroic Age of Antarctic Exploration to maintain radio contact with its country of origin. Only a high-powered facility of comparable capacity to those recently established at Sydney (VIS) and Perth (VIP) would have been capable of direct communication between Hobart and
Cape Denison in Antarctica, and that would have been prohibitively expensive and resource hungry. It was decided to establish an intermediate station at
Macquarie Island and, by halving the maximum distance for each signal to traverse, it was expected that the 2 kW Telefunken transmitters of the Australasian Wireless Co. Ltd. would enable reliable communication. Jeffryes had a keen interest in both Antarctica and wireless telegraphy and, when the first call for applications to join the AAE was made, he sought an appointment as wireless operator. But at that time, his length of experience as a telegraphist and wireless telegraphist was not great and he was not successful.
Douglas Mawson appointed
Walter Henry Hannam, who was associated with the prominent aviation pioneer and inventor,
George Augustine Taylor, and had himself been involved with the establishment of the
Wireless Institute of Australia. A series of tragedies and mishaps had led to the Cape Denison shore base on Antarctica being kept open for a second winter, from March to December 1913. But there had been some tension between Mawson and Hannam and, in January 1913, Hannam elected to return home after his year at Macquarie Island and Cape Denison. The intermediate station that he set up at Wireless Hill on Macquarie Island was fully functional and providing sterling service, exchanging messages with the Hobart coastal station VIH. But there had been ongoing problems with both transmission and reception at Cape Denison, and only occasional messages were got out. That failure prevented the expedition from fulfilling the terms of its contract with Australian and London press in providing timely updates on the activities and status of the expedition. The replacement wireless officer would bring with him improved wireless telegraphy receivers (sensitivity of the crucial detectors was taking great strides at the time) which it was expected would make the Cape Denison station fully effective. An appeal was made for a wireless operator to serve during the second winter of the AAE, and Jeffryes was given the appointment. Climatic conditions outside the hut made outdoor exercise in winter impossible, leading to
cabin fever. All the expeditioners would have been familiar with tales of Antarctic winter madness and, particularly, the problems of the
Belgian Antarctic Expedition. Conditions at Cape Denison were clearly worse than those on the
Belgica, due to the
katabatic winds which, because of the unique geography, are at their upper extreme in the vicinity. In July 1913, as Antarctica neared midwinter, wireless operator Jeffryes began to exhibit symptoms of paranoia to his fellow shore-party winter explorers, none of whom knew how to receive or transmit messages in Morse code. Expedition leader Mawson began to encourage another expedition member, airman
Frank Bickerton, to learn Morse code as quickly as possible. Jeffryes's condition waxed and waned. For some weeks his comrades believed he was recovering but, in September of the same year, the radioman experienced a
psychotic break and began transmitting a message, through Macquarie Island, to Australia, declaring himself to be the only sane man on the expedition. Jeffryes accused all of his comrades of having joined a
criminal conspiracy to murder him. Thereupon, Mawson relieved Jeffryes of his duties. ==Return and later life==