TELE-TECH & - AmericanRadioHistory.Com

New Broadcast Equipment
AMPLIFI ERS
From 4 to 12.4 xrc, Model 492A and
494A Traveling -Wave Tube Amplifiers
give broad band amplification, choice of
amplitude, pulse, phase or frequency
modulation, constant 25 to 30 db gain,
VHF STANDARD
ATTENUATOR
Precise measurement of attenuation
in electrical elements over a frequency
range from dc to 300 Mc may be easily
carried out by means of a new VHF
TV CRAWL MACHINE
New electronically remote controlled
crawl and special effects machine was
designed to produce high grade continuous
travel TV program credits, commercials
and films for use in open and
and constant output. Instruments are
compact, and simple to operate. Model
492A covers 4 to 8 KMC with 30 db gain,
10 mw output and 15 millimicrosecond
rise time. Model 494A cover 7 to 12.4
KMC with 25 db gain, 5 mw output, 15
millimicrosecond rise time. Both amplifiers
can be used for wide dynamic
range antenna tests and SWR measurements.
Hewlett- Packard Company, 275
Page Mill Rd., Palo Alto, Calif. TELE-
TECH & ELECTRONIC INDUSTRIES
(Ask for 4 -14)
AIRBORNE TV SYSTEM
Airborne TV system that will enable
a battle commander to watch several
combat sectors is being built and tested
for the U.S. Army Signal Corps. A
camera -carrying plane would transmit
pictures to a receiver- equipped command
post, the video signal being carried
by FM. Plane carrying a camera
and FM transmitter at approx. 1,000 ft.
would have a line -of -sight transmission
range of about 25 or 30 m. The FM
system would provide a commander
Standard Attenuator. Instrument, Type
FT -DTR, provides accurate attenuation
from 0 to 100 db in 1 db steps. Accuracy
of the Type FT -DPR is as follows: 1 db
steps 0 -30 mc; -0.01 db /step, 30 -300
mc; ±0.02 db /step; 10 db steps 0 -300
mc; ±0.1 db /step. Instrument weighs
24 lbs. and is 193/4 in. long, 73/4 in. high,
and 101/4 in. deep. It has a characteristic
impedance of 50 ohms. Instrument Div.,
Federal Telephone and Radio Company,
100 Kingsland Rd., Clifton, N. J. TELE-
TECH & ELECTRONIC INDUSTRIES
(Ask for 4 -16)
TELESCOPIC TOWER
A new -type mobile telescopic tower
has been developed as a solution to the
problem of remote television pickups.
The tower is made in heights of 60
ft. and 85 ft. It can be operated by two
men and the tower, with microwave
transmitter attached, can be up and on
the air in less than 45 min. Orientation
controls at the base of the tower enable
the men to do all the work without
closed TV circuits. The electrical control
produces a steady travel of film
with adjustable speeds that can be
varied, even while the film is in motion.
The unit can be operated in either
vertical or horizontal positions. Direct,
non -photographic printing method is
used to produce messages in line, halftone,
shaded or color process. Progra-
Master Co.. 1 Waterman Ave., E. Providence.
R.I. TELE -TECH & ELEC-
TRONIC INDUSTRIES (Ask for 4 -33)
PICTURE TUBE
The 8DP4 is a low -voltage electrostatic
-focus and magnetic -deflection
type. It has a spherical Filterglass faceplate,
a screen 7lí8 in. x 53/4 in. with
slightly curved sides and rounded corners
and a min. projected screen area
of 35.5 sq. inches. Employing wide -angle
(90 °) deflection, the 8DP4 has a max.
overall length of 103/4 in. and weighs
less than 3 lbs. Other design features
include a specially designed, precision
electron gun requiring an external,
with an immediate overall picture of
enemy forces and their deployment as
seen on a panel of 17 -in. TV screens.
Admiral Corporation, 1191 Merchandise
Mart, Chicago, Ill. TELE -TECH &
ELECTRONIC INDUSTRIES (Ask for
4 -38)
leaving the ground. WFLA -TV has
been using this new tower on a remote
pick -up 20 miles from its station, with
outstanding results. E -Z Way Towers,
Inc., P.O. Box 5491, Tampa, Fla. TELE-
TECH & ELECTRONIC INDUSTRIES
(Ask for 4 -30)
single -field ion -trap magnet; and an
external conductive bulb coating which
with the internal conductive coating
forms a supplementary filter capacitor.
Tube Div., RCA, Harrison, N. J. TELE-
TECH & ELECTRONIC INDUSTRIES
(Ask for 3 -132)
126
Tele-Tech & ELECTRONIC INDUSTRIES June 1956