Manual of wireless telegraphy and telephony

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J. Wiley, 1913 - Radio - 300 pages
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Page 229 - XX.) thrice repeated at intervals of two minutes, the call can only be renewed after an interval of half-an-hour, the station making the call having first ascertained that no radiotelegraphic communication is in progress. XXII. 1. As soon as the coast station has answered, the ship station makes known — (a) The distance of the ship from the coast station in nautical miles. (b) Its true bearings in degrees reckoned from o to 360.
Page 228 - The call should be made, as a general rule, only when the distance of the vessel from the coastal station is less than 75 per cent of the normal range of the latter.
Page 263 - Governments of Germany, the United States of America, Argentina, Austria, Hungary, Belgium, Brazil, Bulgaria, Chile, Denmark, Spain, France...
Page 230 - When a coast station receives calls from several ship stations, the coast station decides the order in which the ship stations shall be allowed to transmit their correspondence. The sole consideration which must govern the coast station in settling this order is the necessity of allowing every station concerned to exchange the greatest possible number of radiotelegrams. XXIV. Before beginning the exchange of correspondence the coast station informs the ship station whether transmission is to take...
Page 236 - ... are essential for the proper disposal of radiotelegrams, and provided also that adequate arrangements are made for accounting. X. 1. Radiotelegrams bear the service instruction "Radio" in the preamble. 2. In the transmission of radiotelegrams from ship stations to coast stations the date and the time of handing in are omitted from the preamble. On re-transmission over the ordinary telegraph system, the coast station inserts, as the indication of the office of origin, its own name followed by...
Page 239 - II. The call should not be continuous, but should be at intervals of about three minutes in order to give the station a chance to answer. III. After the station answers the vessel should send her name, distance from station, weather, and number of words she wishes to send; then stop until the station makes OK signals, the number of words she wishes to send the vessel, and signals go ahead.
Page 221 - They must be of good antecedents and habits and free from bodily defects and diseases. They must be citizens of the United States or have made legal declaration of their intention to become citizens of the United States and be able to speak, read, and write the English language.
Page 229 - As a general rule, it is the ship station which calls the coast station. 2. The call must only be made, as a general rule, when the distance of the ship from the coast station is less than 75 per cent, of the normal range of the latter. 3. Before beginning to call, the ship station must adjust its receiving apparatus to the highest possible degree of sensitiveness and make sure that the coast station which it wishes to call is not engaged in communication. If it finds that transmission is taking...
Page 231 - When the radiotelegram to be transmitted contains more than 40 words, the transmitting station interrupts transmission after each series of about 20 words with a mark of interrogation and only continues transmission after having obtained from the receiving station the repetition of the last word duly received, followed by a mark of interrogation. In the case of transmission by series, an acknowledgment of receipt is given after each radiotelegram. XXVII. 1. When the signals become doubtful, it is...
Page 269 - A Concise and Simple Explanation of the Construction and Use of an Inexpensive Wireless ^Equipment for Sending and Receiving up to 100 miles, giving Full Details and Illustrations.

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