Elements of Radio Communication

292 Pages·1929·30.373 MB·English

by  John Harold Morecroft

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ELEMENTS OF RADIO
COMMUNICATION
WORKS OF
PROFESSOR H. MORECROFT
J.
PUBLISHED BY
JOHN WILEY & SONS, Inc.
Elements of Radio CommDnlcation
AnIntroductory volume to the more comprehensive
text"Principles of Radio Communication," by J. H.
Morecroft. x+269pages. 6by9. 170 figures. Cloth.
Principles of Radio Communication
Atextdealing -with all phases of the radio art. By
J. H. Morecroft, Assisted by A. Pinto and W. A.
Curry. Second Edition, thoroughly revised. xiv
+ 1001pages. 6by9. 831 figures. Cloth.
Continuous and Alternating Current Alacliinery
Anelementary textbook foruse in technical schools.
iTxhe+W4i6l6epyagTeesc.hni3cialbySe7r1i.es.28J8.fMig.urJeas.mesColno,thE.ditor,
BY
J. H. MORECROFT AND F. W. HEHRE
Electrical Circuits and Machinery
For students in Engineering schools, whatever the
branch in which they expect to specialize. By
J. H. Morecroft and F. W. Hehre, Associate Pro-
fessor of Electrical Engineering, Columbia Uni-
versity.
Vol. I. Continuous Currents, xiii + 407 pages.
6by9. 351 figures. Cloth.
Vol. II. Alternating Currents. 2dEdition. xiii+
462 pages. 6 by 9. 440 figures. Cloth.
Vol. III. Experiments, iv + 165 pages. 6by9.
83 figures. Cloth.
ELEMENTS OF RADIO
COMMUNICATION
BY
JOHN MORECROFT
H.
Professor of Electrical Engineering, Columbia University
Past President of the Institute of Radio Engineers
NEW YORK
JOHN WILEY & SONS, Inc.
London: CHAP:\LA.N & HALL, Limited
1929
Copyright, 1929
BY
John H. Mobecroit
Printedin U. S.A.
PRESSOF
Oll/lOC^l BRAUNWORTH&CO..INC.
BOOK MANUFACTURERS
BROOKUYN, NEWYORK
PREFACE
During the past few years the author has received many sug-
gestions that an introductory volume to his more comprehensive
text "Principles of Radio Communication" would fill a real need.
It is with the idea of filhng such a need that the following simple
text in radio has been written. There are thousands of students
today, in schools and out, who are sufficiently interested in the
subject to desire something more sound and thorough than the
many "popular" texts on radio which have appeared, but who
have neither the preparation nor time to attempt such a text as
the author's "Principles." It is for these studentsthatthe "Ele-
ments of Radio Communication" has been prepared.
This text is not a collection of excerpts from the larger volume,
but has been written entirely anew. The general scheme is the
same as that which gave the "Principles" its popularity, namely,
a general review of those parts of the alternating current theory
which are of fundamental importance in radio, followed by the
specific apphcations of these principles to radio telegraphy and
telephony.
Practically no mathematical preparation, more advanced than
algebra, is required for complete mastery of this elementary text.
It is, nevertheless, sufficiently complete for any radio enthusiast
except the engineers speciaHzing in this branch of communication;
for these the text forms a reasonable introduction to the subject.
A large proportion of the students of radio are naturally inter-
ested in broadcasting, so most of the specific treatment is directed
to this field. Reasonable amplifications, power factors, losses,
etc., are given for apparatus designed for the broadcasting fre-
quencies. Curves illustrating the performance of radio circuits
are in general typical of their action in this band of frequencies.
The last chapter deals with all kinds of receiving sets, from a
simple crystal circuit to the most modem a.c. operated receiver.
Balanced circuits, push-pull amplifiers, different types of loud
speakers, selectivity and fidelity of amplifiers, filters, etc., are all
dealt with as thoroughly as space allows.
PREFACE
vi
Accompanying each chapter is a set of problemswhich should
prove of much value to both instructor and student. The prob-
lemsareforthemostpart, madeupfromthe circuitsofactualradio
receivers, so that as the student works them he not only becomes
familiarwiththe principlesofradio circuits, but also gains a knowl-
edge of the actual performance of these circuits as they are incor-
porated in modern radio receivers.
J. H. M.
May 1, 1929.