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International ELECTRONIC SOURCES
The Wide -Basis Direction Finder "Wullenwever."
by H. Rindfleisch. "Hach. Z." March
1956. 6 pp. The antenna combinations of a circular
40 antenna array, 2 sets of 4 adjacent
antennas being combined, are explained. A
delay compensating network permits a narrow
direction finding characteristic. Source 6/6 -199
Design of ASDE Radar Equipment, by J.
Woodward. "Tele- Tech" June 1956. 4 pp. Airport
Surface Detection Equipment, short -range,
K -band radar, supplements or replaces the
visual observation of the control tower operator.
This article reviews the design considerations,
construction, and performance of a new
system now being developed for the Air Force.
Source 6/6 -248
Optical Simulation of Radar, by W. Blitzstein
and T. Levine. "Tele- Tech" June 1966. 3 pp.
Targets are simulated by spots of light moving
across a screen so that their paths trace aircraft
-like trajectories. Pickup device detects
targets in polar coordinates for the radar input.
Source 6/6 -249
SEMICONDUCTORS
Transistor Power Gain Meter, by W. Chow.
"Tele- Tech" June 1956. 4 pp. Maximum available
signal power gain is determined by using
a constant power signal input generator, a
variable load resistance, and an indicating device.
The constant input power is supplied by
a constant voltage generator working into a
variable impedance. Source 6/6 -260
On Transistor Equivalent Circuits, by J.
Gaschi. "Onde" Mar. 1956. 9 pp. An equivalent
circuit for higher operating frequencies, considering
capacitive and transit time effects, is
derived. The diffusion equation is solved and
the currents, operational characteristics, and
admittances computed. Source 6/6 -200.
The Junction Transistor at High Frequencies,
by J. Vasseur. "Onde" Mar. 1956. 22 pp. Spontaneous
oscillations and neutralization circuits
are studied. 14 pages of formulas for the common
base, common emitter and common collector
circuits, characterizing their behavior at
different frequencies, are included. 6/6 -201
bultivibrator Circuits Using Junction Transistors,
by A. Jackets. "El. Eng." May 1956. 6 pp.
Discussion of the design and performance of
low frequency free -running multivibrator circuits
using junction transistors. Principles of
operation are discussed. These include the conditions
for bottoming, factors determining frequency,
and the sharpness of the output waveform.
Methods of varying the ratio of the on
and off periods are cited. Source 6/6 -292
Germanium Diodes, by A. Puzhai. "Avto i Tel."
Feb. 1956. 7 pp. The paper stresses the advantages
of germanium diodes over other rectifiers.
Main categories of germanium rectifiers
are given, as well as advice concerning their
application. Tables of characteristics and main
parameters for Soviet germanium diodes are
given. Source 6/6 -208
Transistor Generator Simulates Radar Target.
by W. Eckess, J. Deavenport, and K. Sherman.
"El." May 1956. 3 pp. Target pulse, available
from transistorized video simulator, is variable
in amplitude, width, and range. Used for field
and bench testing of radar. Source 6/6 -204
Some Theoretical and Practical Considerations
of the Johnsen -Rahbek Effect, by A. Stuckes.
"Proc. BIEE." Mar. 1956. 7 pp. A theory of
electrostatic attraction, influenced by field
emission, is proposed to explain the Johnsen-
Rahbek effect between the flat and polished
surfaces of a metal and semiconductor in contact.
It is suggested that an electrostatic clutch
based on this principle is unreliable and that
the more likely applications lie in relay devices
and valves for controlling gas flow. Source
6/6 -205
Germanium Diodes, Germanium Power Diodes,
and Germanium Power Rectifiers, by R. Henry,
B. Dreyfus -Alain, and M. Sassier, respectively.
"Onde" Mar. 1956. 16 pp. These 3 separate
short survey articles report on the present
stage of the art on point -contact germanium
crystal diodes, germanium junction power
diodes and germanium power rectifiers, respectively.
Characteristics are stated and circuits
are given. Source 6/6 -206
'iti tz
TELEVISION
Saedwestfunk Television Studio Technique, by
E. Becker. "Tech. Haus." No. 1/2, 1956. 3 pp.
The installations of the two TV studios, having
separate control equipment for audio and video.
are described. Super -iconoscope and super -
orthicon cameras are used. Source 6/6 -207
The Rebuilding of the Baden -Baden Municipal
Hall as a Television Center, by K. Schaefer
and H. Westphal. "Tech. Haus." No. 1/2, 1956.
l pp. The layout and acoustical design of the
studios are described, as well as the heating
and air -conditioning installations and the
power plant. Source 6/6 -208
Video, Sound, and Signal Equipment of the
Baden -Baden Television Studio, by P. Send and
L. Schluessele. "Tech. Haus." 1/2, 1956. 11 pp.
Block diagrams of the video and of the acoustical
circuits are given and discussed ; the general
set -up is explained. The various operational
possibilities of the installation and the
features required therefore are pointed out.
Source 6/6 -209
The Television Outdoor Broadcasting Unit of
the Suedwestfunk, by K. Baer and L. Schluessele.
"Tech. Haus." 1/2. 1956. 7 pp. Adapted
to operate and take scenes in partly mountainous
regions, the unit includes separate vehic'es
for apparatus, operations, and control, respectively.
These installations are described. Source
6/6 -210
The Use of 16 -mm Film in Television, by O.
Schulze. "Tech. Haus." 1/2, 1956. 3 pp. The
photographic techniques. fine -grain emulsions
of sufficient sensitivity, to improve the film
quality for use in TV broadcasting are investigated.
The edge of the film is reversed for
magnetic sound recording. A satisfactory film
is indicated. Source 6/6 -211
Mobile Unit for Color TV Broadcasting, by H.
Klerx. "Tele- Tech" June 1956. 3 pp. Air conditioned
28 foot truck houses 2 live color chains
and associated equipment. Complete facilities
are provided for on -air and closed circuit applications,
and for use at the studio location as a
temporary color facility. Source 6/6 -252
Measuring Color Television Luminance -vs:
Chroma Delay, by A. Ettlinger. "Tele- Tech"
June 1956. 3 pp. Simple unibar generator of
special design provides at the encoder output a
signal whose waveform pattern can be examined
for symmetry as an accurate qualitative
check of delay. Source 6/6 -261
From Alexandra Palace to Crystal Palace. The
B. B. C.'s New London Television Station. "J.
BIRE" Apr. 1956. 6 pp. Description of the
equipment and operation of a recently opened
British TV station. Source 6/6 -39
Phonevision -An Effective Method for Subscription
Television, by A. Webb and A. Ellett.
"J. IRE" Apr. 1956. 15 pp. A brief analysis of
the economic problems of subscription TV is
followed by a discussion of the operational
objectives of such a system, and a description
of the Phonevision system. Source 6/6 -212
On the Definition of the Signal -to-Noise Ratio
in Television Determined by Statistical Flue -
tuations, by R. Theile and H. Fix. "Arc. El.
Uber." Mar. 1956. 7 pp. The dependence of
the noise amplitude on the signal amplitude is
experimentally investigated for several picture
tubes. Subsequently the physiologically disturbing
effects of identical noise amplitudes at
different signal amplitudes are established, a
dark grey being considered the most sensitive
brightness, based on these findings a new figure
of merit is proposed. Source 6/6-213
Color Television, by H. d'Auriac, "Onde" Mar.
1956. 6 pp. This second installment of a lecture
held for non -specialists is particularly
concerned with the various solutions in the
U. S. and the considerations involved in finding
a solution suitable for Europe. Source 6/6 -214
Method and Apparatus for Film Taking and
Editing in the Suedwestfunk's Television Service,
by G. Becherer and O. Rabe. "Tech.
Haus." 1/2, 1956. 6 pp. The camera types used
for taking the 16 -mm films and the types of
program suitable for film telecasting are considered.
The subsequent editing techniques, including
cutting, insertion of commentaries,
synchronization and mixing are set forth.
Source 6/6 -215
A Mobile Unit for Color Television Broadcasting
and Closed- Circuit Applications, by H.
Klerx. "BC News" Apr. 1956. Description of a
color mobile unit which is designed to accommodate
2 color camera chains with a full complement
of equipment and still provide room
for comfortable operation. The equipment is
housed in a 28 ft. truck complete with air
conditioning. Source 6/6 -216
KMTV Brings Color TV to Omaha. by R.
Schroeder and P. Greenmeyer. "BC News"
Apr. 1956. 22 pp. Description and operation of
a station which recently installed multi -camera
live color with a color film system to air more
than 100 color shows per month. Source 6/6 -217
TV Modulation Indicator Uses Electronic Chopper,
by E. Tink. "El." May 1956. 2 pp. Video
output signal of transmitter is momentarily
interrupted by multivibrators instead of mechanical
vibrator. Reference for checking percentage
modulation of TV picture transmitter
is obtained. TV scanning system and chopping
pulse are synchronized. Source 6/6 -218
Remarks on a Color Television System with
Two Amplitude -Modulated Carriers, by J. Wolf.
"El. Rund." Apr. 1956. 4 pp. The method suggested
by Teer and Valeton of having two AM
carriers for the color signals, the phase of the
carriers being abruptly shifted after each
frame. is mentioned. Circuitry to generate such
carriers and to cause their phase shift are included.
Source 6/6 -219
Progress in the Development of Post- Acceleration
and Electrostatic Deflection, by K. Schlesinger.
"Proc. IRE" May 1956. 9 pp. Electrostatic
deflection from a common center is possible
by the use of electrostatic yokes or
Deflectrons. The most suitable type of post -
accelerator for use with Deflectrons employs a
long drift space, bounded by a metallic mask.
and confines the high gradient to a narrow
136 Tele -Tech & ELECTRONIC INDUSTRIES June 1956