【正文】 re 1 6/93 History of Radio Guglielmo Marconi(18741937)(Italy) Alexander Popov (18591906)(Russia) 2022 April GMDSS Services – Lecture 1 7/93 Guglielmo Marconi/ Alexander Popov By September 1895, They had already built the equipment that transmitted electrical signals through the air, which marked the beginning of telegraphy, or radio. 2022 April GMDSS Services – Lecture 1 8/93 Guglielmo Marconi(18741937)(Italy): grandfather of wireless munication 1909 Nobel Prize in Physics (1/2 of the prize ) for his contribution to the development of wireless telegraphy 2022 April GMDSS Services – Lecture 1 9/93 History of Radio at Sea: (1). 1899 the American ship St. Paul received messages when it was almost 100 kilometers away from the transmitter at Isle of Wight. 2022 April GMDSS Services – Lecture 1 10/93 (2). The first International Radiotelegraph Conference held in 1906 in Berlin signed the first International Radiotelegraph Convention, and the annex to this Convention contained the first regulations governing wireless telegraphy. 2022 April GMDSS Services – Lecture 1 11/93 (3). Titanic and Distress Signals On April 2nd 1912 the pleted Titanic set sail from Belfast for her sea trials. No one could have known that in less than two weeks she would be 12500 feet down at the bottom of the Atlantic Ocean broken in two pieces. 2022 April GMDSS Services – Lecture 1 12/93 2022 April GMDSS Services – Lecture 1 13/93 2022 April GMDSS Services – Lecture 1 14/93 2022 April GMDSS Services – Lecture 1 15/93 2022 April GMDSS Services – Lecture 1 16/93 On Thursday April 11th the Titanic arrived in Queenstown in Ireland around lunchtime. That afternoon she sailed from Ireland for America. From Sunday morning, her wireless operators were receiving many warnings of icebergs ahead. 2022 April GMDSS Services – Lecture 1 17/93 At 10:00pm that evening the bridge watch changed and the new crew was headed by First Officer Murdoch. At 11:40pm a call came from the crow39。 Indian Ocean Region (IOR)。 2022 April GMDSS Services – Lecture 1 65/93 ? Details for each individual ship are to be found on its Safety Radio Certificate. On a Sea Area A1 ship, for example ( which always remains within DSC range of a shore VHF station) the primary means would be the VHF DSC, and the secondary means could be an EPIRB. In the case of a Sea Area A4 ship, the primary means would have to be HF DSC and the secondary means a 406 MHz EPIRB. 2022 April GMDSS Services – Lecture 1 66/93 reception of shoretoship distress alerts。 ? “ On scene munications” are short to medium range munications (generally via VHF or MF) carried out during the course of a search and rescue operation (between ship in distress and SAR units or between SAR units). For this purpose, ships must be able to municate with aircraft, as well as with other ships, using the dedicated GMDSS frequencies for voice and NBDP distress munications. 2022 April GMDSS Services – Lecture 1 75/93 transmission and reception of signals for locating。 ? The GMDSS provides facilities for all types of mercial and personal munications. GMDSS radio operators need to know how to make telephone and telex calls to shipping agents, port authorities, the public telephone work etc. through mercial telemunication works. 2022 April GMDSS Services – Lecture 1 82/93 transmission and reception of bridgetobridge munications。 and ? ? Atsea maintenance (ASM). 2022 April GMDSS Services – Lecture 1 90/93 Ships trading in areas Al and A2, shall ensure this availability by using at least one of the following methods: ? ? Duplication of equipment (DOE)。 and ? ? Atsea maintenance (ASM). 2022 April GMDSS Services – Lecture 1 92