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RADIO FOR
HOW can radio telephone apparatus, for sending as well as receiving, be installed in a lifeboat? The proper navigation of such a boat in a storm makes it necessary to reduce to a minimum any apparatus above the deck level. No loose wires above, in, or under the boat are permissible, since this would interfere with the proper handling of the boat and the throwing of lines. A small antenna of the ordinary elevated type would be highly undesirable from the navigating point of view.
Those were the obstacles that arose when the United States Coast Guard and officials of the Bureau of Standards considered the application of radio telephony to the problem of communication between a shore station and the life boat tossing out in the open sea. The importance of communication was obvious.
RADIO ON A LIFE BOAT The receiving and sending set installed well forward
LIFEBOATS
It was attacked diligently, and after tests it is believed that the question has been answered.
The boat selected for the test was a thirtysix foot, motor driven lifeboat, equipped with a heavy metal keel. The receiving and transmitting set was installed as far forward as possible. From the set a wire was run forward and connected to the metal keel. Two more wires, heavily insulated, were run aft from the set along the guards and connected with the keel. A particular kind of coil antenna was thus formed, of which the keel constituted a part. This arrangement was satisfactory from a navigating point of view.
The transmitting apparatus used at the shore station and on the boat were identical, and consisted of a five-watt radio telephone transmitting set. The wave length used for
THE LIFE BOAT AERIAL Showing how the wires were arranged on the boat to form a kind of coil antenna