Wireless Telegraphy and Telephony
Forfatter: Alfred P. Morgan
År: 1917
Forlag: The Norman W. Henley Publishing Company
Sted: New York
Udgave: Third Edition, Fully Illustrated
Sider: 33
UDK: 621.396.1 Mor
A practical Treatise on Wireless Telegraphy and Telephony, giving Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and its Present Day Applications, together with a chapter on the possibilities of its Future Development
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8o
WIRELESS TELEGRAPHY
so arranged that they have different comparative values
at the same moment. It is possible to send very strong
signals in a direction lying in the same plane as the aerials.
By the use of three or more antennæ suitably differing in
their phase of excitation and situated at the vertices of a
Fig. 98.—Arrangement of Bellini and Tosi for directive wireless
telegraphy.
triangle it is possible to send strong signals in certain di-
rections only.
Messrs. Bellini and Tosi have devised a very ingenious
method of directively transmitting and receiving electric
waves as shown in the accompanying diagrams. The an-
tenna consists of two closed or nearly closed circuits of
triangular shape arranged in two perpendicular planes.
The two aerials each contain a circular coil of wire per-
pendicular to each other with their windings in the planes
of the antenna circuits respectively. A third coil is con-
nected to the receiving apparatus when the messages are