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International ELECTRONIC SOURCES
Improved Subscriber Branching Network for
the 16 kc Call Charge Indicator, by W. Herlitr..
"Nach. Z." Mar. 1956. 5 pp. A special branching
network at a telephone subscriber's set and
u transistor amplifier, both installed to extend
the 5 km limit of the call charge indicator, are
described. Design and performance details are
presented. Source 6/6 -104
Commercial SW- Receiver Equipment with
Wide -Band Amplifiers, by F. Hacks. "El.
Rund." Apr. 1956. 3 pp. If one antenna is used
to feed several receivers, the intermediate decoupling
amplifier must meet special requirements,
such as low noise, satisfactory decoupling,
no mutual coupling, etc. Design
considerations of this type of amplifier are
presented. Source 6/6 -105
Telemetering Receiver Conserves Bandwidth,
by M. Redden and H. Zancanata. "El." May
1956. 5 pp. Separate i -f amplifiers recover
FM/FM and PWM /FM data in 220 MC telemetering
band, using crystal controlled double
superheterodyne principle. Receiver characteristics
are discussed. Source 6/6 -106
A Method of Deriving Overall Negative Feedback
Voltage in Transmitters, by D. Smart.
"J. HIRE" Apr. 1956. 3 pp. The feedback
voltage is derived from a resistor in the ground
return of the power amplifier tube. Ease of
frequency changing, greater linearity, and reduced
phase shift, drift, and cost eliminate the
disadvantages of conventional methods of deriving
feedback voltage. Source 6/6 -107
On The Problem Of Filtration Of Nonstationary
Random Functions, by Yu. P. Leonov.
"Avtu. i Tel." Feb. 1956. 10 pp. The paper
considers the filtration of nonstationary second
order random functions by means of stationary
linear filters. A new criterion for an optimum
filter is introduced. An expression is given for
the optimum, physically realizable transfer
function of the filter. The problem of determining
the power spectrum of the nonstationary
random function is examined both analytically
and experimentally. Source 6 /6-10$
Design Principles for Tuned Output Circuits
of Intermediate -Wave Transmitters, by E.
Khmelnitsky. "Radiotek." Jan. 1956. 4 pp.
The paper examines the design of output circuits
for a high -power intermediate -wave transmitter.
A system consisting of four tuned circuits
with capacitive coupling is proposed. The
paper discusses the requirements for smooth
tuning by solely adjusting the inductances.
Source 6/6 -109
VHF Transhorizon Communication Techniques,
by R. Ringoen and J. Smith. "El." May 1956.
6 pp. Communications using wire or line -ofsight
radio are often unreliable because of
topography, climate, and maintenance problems.
99% reliability of radio teleprinters between
500 and 1500 miles apart is made possible
using the VHF transhorizon techniques
described in this article. Source 6/6 -110
On the Suppression of Disturbances in Carrier -
Frequency Receivers by Opposing a Receiver
('onnected in Parallel, by H. Kaden. "Freq."
Mur. 1956. 7 pp. A system of 2 receivers having
a parallel input and opposing output is
studied provided that the band passed by the
additional receiver is shifted sufficiently to exclude
any signal reception. Conditions prevailing
for a single interfering pulse, and a
succession of pulses and specific receiver behavior
are considered. Source 6/6 -111
Apparatus for Automatic Control of Power
Supplies to Communications Equipment, by K.
Brehm. "AEG Prog." No. 4, 1956. 4 pp. Apparatus
and plant in communications technology
require for their power supplies voltage sources
which are subject to most stringent conditions
regarding regulation and frequency. Examples
of automatic control systems used for this purpose
are described. Source 6/6 -112
SSB High Power Amplifier Design, by F.
Gunter. "Tele- Tech" June 1956. 3 pp. Ingenious
use of modern components has resulted in desirable
simplification, reduction in size, and
high performance in a high power linear amplifier
for single sideband communications applications.
Unit provides up to 30 kw output in
the 4.0 to 26.5 MC band. Servo motor drive
provides automatic tuning of tank circuit.
Source 61,6 -240
COMPONENTS
7 Design Tips for Printed Circuit Layout, by
A. Linden. "El. Des." Apr. 15, 1956. 4 pp.
Tips given facilitate laying out printed circuit
boards for low cost automatic assembly, functional
operation, and easier maintenance. Examples
illustrate the use of the procedures
outlined. Source 6/6 -113
Cascaded Feedthrough Capacitors, by H.
Schlicke. "Proc. IRE" May 1956. 6 pp. By
incorporating lossy ferrites in a stacked structure
of discoidal feedthrough capacitors, extremely
effective filter capacitors not heretofore
available are evolved. The theory is given and
the practical significance for extremely effective
miniature low -pass filters is presented.
Source 6/6 -114
Toroidal Transformers Pass Video Bandwidths.
by G. Gray. "El." May 1956. 4 pp. Design and
construction details are given for 6 MC bandwidth
transformers that drive 50 ohm coax.
Units can also be used as coupling transformers
in video transistor amplifiers. Source
6/6 -115
"K" Gaged Mica Makes 50% Smaller Capacitors,
by I. Glerum. "El. Eq." May 1956. 2 pp.
Accurate mica gaging based on dielectric constant
selects equivalent mechanical thickness
and cuts waste by 40 to 50%. Need for adjusting
or scraping silvered mica is eliminated.
Source 6/6 -116
Pyrolytic Carbon Resistors: A Comparison of
Three Types, by C. Wellard. "El. Eq." May
1956. 3 pp. Part II (conclusion) of a discussion
of the essential differences between boron -
carbon, deposited carbon, and carbon -alloy resistors.
Source 6/6 -117
Electronic Components, by P. Andrieux, A.
Darin, and M. Dauphin, respectively. "Onde"
Mar. 1956. 21 pp. Electronic components, the
organization of French efforts in connection
with component specifications, and the testing
of components and tubes at the L.C.I.E., respectively,
are discussed in 3 separate articles.
Testing methods meet the specification CCTU
01 -01 and the U. S. specification MIL -E -IB.
Source 6/6 -118
Development of a Standardized Line of Impregnated
Paper Capacitors, by C. Laurent.
"Onde" Mar. 1956. 20 pp. The characteristics
of recently developed rectangular and tubular
case capacitors are presented. The considerations
for the particular design selected and the
operational characteristics thus obtained are
included. Source 6/6 -119
Performance of Selenium Rectifiers at High
Temperatures, by N. Bechtold and E. Morris.
"El. Mfg." May 1956. 6 pp. A comprehensive
test program was conducted in order to acquire
Berating data for both conventional and high
temperature stacks at various ambients. Rerating
curves are presented. Chief criterion of
comparative performance is ratio of ac current
to reverse leakage current. Source 6/6 -241
High- Temperature, Foil -Type Tantalum Capacitors,
by D. Peck, S. Burbriski, and W.
Schroeder, Jr. "El. Mfg." May 1956 3 pp.
Rolled tantalum -foil capacitor section, impregnated
with a non -aqueous, organic type electrolyte,
and sealed in a tubular aluminum
housing with a special Teflon -rubber triple
spun gasket operates at 125 °C. Life test data
are presented. Source 6/6 -242
COMPUTERS
Computing Machines and Automation, by Dr.
A. Astin. "Comp." Apr. 1956. 7 pp. This is the
testimony given by the Director of NBS before
the Committee on Economic Stabilization, Joint
Committee on the Economic Report, Oct. 27.
1955. He gives his views on the future of office
and factory automation. Source 6/6 -120
Tape Identification and Rerun Procedures for
Tape Data Processing Systems, by L. Eallson.
"Comp." Apr. 1956. 2 pp. Errors arising in
electronic data processing systems are discussed,
and a method indicated for checking
the accuracy with which the manual operations
have been executed. Source 6/6 -121
Conference on Electronic Digital Computers
and Information Processing, Darmstadt, Germany,
October 25 to 27, 1955. "Comp." Apr.
1956. 11 pp. Titles and abstracts of the 60
papers presented at the Conference are given.
with a list of speakers and addresses. Source
6/6 -122
Publications for Business on Automatic Computers:
Reference Listing, Part 2, by N.
Chapin. "Comp." Apr. 1956. 2 pp. Listings
concerning automatic computing machinery and
its use in business. Part 1 appeared in the
March, 1956, issue. Source 6/6 -123
Design Of Diode Function Generators, by A.
Talantsev. "Avto. i Tel." Feb. 1956. 11 pp.
The paper examines the methods of design,
construction and adjustment of diode circuits
used for reproducing functional dependencies in
direct- current electronic simulators. It is shown
that the application of elements with "potential-
grounded diodes" permits considerable reduction
(30%) in the number of resistors in
the circuit and considerable simplification of
the diode circuit design. Source 6/6 -124
Computer Developments. "El. Des." May I,
1956. 2 pp. Discussion of some of the papers
delivered at the programming and code sessions
at the Western Joint Computer Conference
held in San Francisco on Feb. 7, 1956. Source
6/6 -125
Photoelectric Analog -to-Digital Converters, by
A. Mitchell. "El. Des." May 1, 1956. 4 pp. A
light source is provided on one side of a disc
which is divided into concentric zones coded in
Gray or "reflected' schemes. Photocells are
mounted, one for each zone, opposite the light
source, on the other side of the disc. The
sequence of yes -or -no conditions in the photocell
series determines shaft position. Source
6/6 -126
The Computers Memory, by F. Fowler, Jr.
"Con. Eng." May 1956. 9 pp. Description of
the most important storage systems and a comparison
of their principal characteristics.
Source 6/6 -127
Tele -Tech & ELECTRONIC INDUSTRIES June 1956
131