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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22
WIRELESS TELEGRAPHY
It is beyond the scope of the book to enter into all of the
engineering details pertaining to the installation of a wire-
less station, but a few remarks and instructions for the
benefit of those who may be interested in this phase of the
subject may be appreciated.
The hat-top “T” aerial gives the best “all around” re-
sults. The vertical and umbrella forms are close seconds.
Fig. 21.—Umbrella aerial.
For the very best results, the top or horizontal portion of a
“T aerial should be slightly shorter than the vertical sec-
tion.
The umbrella type of antenna is very efficient. Instead
of a wooden mast, an iron pipe terminating above in a sys-
tem of wires, inclining downward and serving both as part
of the aerial and as guys to support the pole, is often used.
The bottom of the pole is placed on an insulating base, pro-