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ABSTRACTS & REVIEWS of
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ELECTRONIC ENGINEERING
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TELE-TECH &
ELECTRONIC
INDUSTRIES
International
ELECTRONIC
SOURCES
PUBLICATIONS REVIEWED IN THIS ISSUE
Abbreviation Publication Nome Abbreviation Publication Nome Abbreviation Publication Name
AEG Proq. AEG Progress El. Mfg. Electrical Manufacturing Phil. Tech. Philips Technical Review
Arc. El. Uber. Archiv der elektrischen Uber- El. Rund. Electronische Rundschau Proc. BIEE Proceedings of the British
tragung Freq. Frequenz Institution of Electrical En-
Avto. i Tel. Avtomatika i Telemekhanika Hochfreq. Hochfrequenz -technik und gineers
BC News Broadcast News (RCA) Elektroakustik Proc. IRE Proceedings of the Institute of
Bul. Fr. El. Bulletin de la Societe Froncaise Insul. Insulation Radio Engineers
des Electriciens J. GIRE Journal of the British Institu- Radiotek. Radiotekhanika
Comp. Computers and Automation tion of Radio Engineers Tech. Haus. Technische Hausmitteilungen
Con. Eng. Control Engineering J. UIT Journal of the International Tele -Tech. Tele -Tech 8, ELECTRONIC
El. Electronics Telecommunication Union INDUSTRIES
El. Des. Electronic Design Nach. Z Nachrichtentechnische Vide Le Vide
El. Eng. Electronic Engineering Zeitschrift Wirel. Eng. Wireless Engineer
EI. Eq. Electronic Equipment Onde L'Onde Electrique
Also see government reports and patents under "U. S. Government."
El 1
ANTENNAS, PROPAGATION
Calculating the Efficiency of Antenna Arrays,
by G. Mather. "Tele- Tech" June 1956. 3 pp.
By making use of a broadcust antenna array
impedance and power analysis, it is possible to
compare the pattern RMS current of the array
with the base current and effective field of an
omni -directional radiator of equivalent height
and power input. Essentially for radiators of
equal height, the method may be adapted to
arrays with unequal tower heights 6/6 -238
V.H.F. Propagation By Ionospheric Scattering
and its Application to Long- Distance Communication
by W. Bray, J. Saxton, R. White, anc
G. Luscombe. "Proc. BIEE" Mar. 1956. 25 pp.
with discussion. The dependence of the characteristics
of the received signal on frequency.
distance. and antenna directivity is discussed
in relation to existing theories. Observations
are made on the diurnal and seasonal variations
of receiver signal strength. Investigations
are described on the suitability of this
form of propagation for the transmission of
frequency -shift telegraphy signals, and for
telephony signals transmitted by single side -
band AM, and by phase modulation of a carrier.
The applications of vhf scatter propagation
to commercial services is discussed. 6/6 -75
Impedance- Matching Networks for the Compensation
of the Frequency Dependence of the
Input Impedance of Antennas, by R. Herz.
"Nach. Z." Mar. 1956. 6 pp. The simple impedance
matching networks derived convert
the input impedance to resistive. and thus
constant. An actual circuit for 1000 MC is
given as an example to compensate the frequency
dependence of the oscillating dipole of
a cylindrical parabolic antenna. Source 6/6 -76
Investigations on the Propagation of UHF and
VHF, by R. Schuenemann. " Hochfreq." Jan.
1956. 17 pp. The theory of wave propagation
is compared to experimental results. A correlation
computation is presented which depends
on meteorological conditions. Extensive experimental
and computed data are plotted and
evaluated. Source 6/6 -77
A Study of Ionospheric Propagation by Means
of Ground Back- Scatter, by E. Shearman.
"Proc. BIEE" Mar. 1956. 18 pp. with discussion.
The results of a year's observations in
southern England of long range back -scatter
are analyzed. A pulse transmitter coupled to
alternative directional antennas was used and
transmissions were made at noon each day on
a number of frequencies between 10 and 27
MC. The differences in echo patterns between
summer and winter are clearly seen. Source
6/6 -78
An Experiment to Test the Reciprocal Radio
Transmission Conditions Over an Ionospheric
Path of 740 KM, by R. Meadows. "Proc. BIEE"
Mar. 1956. 3 pp. Two-way pulse transmission
made simultaneously on the same frequency
(5.1 MC) between Slough and Inverness (approximately
460 miles apart) are described. A
common transmitter- receiver antenna at each
terminal was used. Fading patterns displayed
at each end were compared visually. The fading
of corresponding echoes was found to be non -
reciprocal for about 1% of the time during the
15 hr. period of the test. Source 6/6 -79
An Experimental Test of Reciprocal Transmission
Over Two Long -Distance High -Fre-
quency Radio Circuits, by F. Laver and H.
Stanesby. "Proc. BSEE" Mar. 1956. G pp. Tests
have been carried out to determine whether
the attenuation of h -f signals sent over a given
long- distance radio path differs according to
the direction of transmission. The results obtained
across the North Atlantic between
Australia and England show that times the
loss in both directions is substantially the
same, and that at other times, the variation
can be in the order of 5 or 10 db. Usually- signals
outward from England suffered the greatest
attenuation. Source 6/6 -80
A Simple Interpretation of the Complex Correlation
Coefficient, by H. Linn and K. Poeschl.
"Arc. El. Uber." Mar. 1956. 2 pp. This mathematical
study correlates the two complex fluctuating
amplitudes defining the complex correlation
coefficient by rotation and stretching
operations of the two respective complex
planes. The transformations define the correlation
coefficient. Source 6/6 -81
Improving Reception by Diversity Operation,
by R. Heidester and E. Henze. "Arc. El. Uber."
Mar. 1956. 10 pp. The average signal -to-noise
ratio and the probability of deviations therefrom
are computed for two types of dual diversity
telegraph systems. From these values the
probability of the occurrence of a letter error
is evaluated as well as the probabilities for the
exceeding of a certain signal -to-noise ratio
threshold in a positive or negative direction.
Source 6/6 -82
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FOR MORE INFORMATION
Contact your nearest library subscribing to publications noted. Excellent
technical periodical sections are maintained by many large
public libraries, engineering universities and electronic companies.
To obtain copies of any articles or complete magazines reviewed
here, contact the respective publishers directly. Names and addresses
of publishers may be obtained upon request, stating publications of
O N
SUBJECTS REVIEWED HERE
interest, by writing to: "Electronic Sources" Editors, Tele -Tech d
ELECTRONIC INDUSTRIES, 480 Lexington Ave., New York 17, N. Y.
The editors con recommend translation agencies.
To obtain copies of U.S. patents, and research reports on military
and government projects reviewed here, send payment indicated directly
to federal agency as instructed in section entitled "U.S. Government."
Tele -Tech & ELECTRONIC INDUSTRIES June 1956 129