TELE-TECH & - AmericanRadioHistory.Com

Regulation in less than '/so th cycle
ASDE Radar
(Continued from page 185)
fi:lt:l1.ldi:l.a1 :11u IlElliif''i.
:IIi41i 111;?l :@iL:Plll! 1111 1:1'111'IN`i':ppI
-1i:(_:;iiïi'!t!.'ll'l'sl`Li''i1i1' 'Ii'I
Output of typical electromechanical
regulator.
;.=7--; r17g.
'Imill:
1
Output of Curtiss -Wright Distortion
Eliminating Voltage Regulator from
same input. Actual oscillograms of
60 cps voltage.
Actual 60 c.p.s. waveform
PLUS Pure Sine Wave Power
CURTISS -WRIGHT LINE REGULATOR
Electronically regulates r.m.s. and peak voltage simultaneously
to 1°0.
Reduces typical power line distortion to less than 0.39%.
Furnishes 1.4 KVA of distortion -free power.
Introduces no phase shift between input and output.
Simultaneously provides additional 4 KVA of =.1
electromechanically regulated power.
Faster recovery time (less than
1 /50th cycle, or 330 microseconds)
plus the unique ability to
eliminate line distortion - these
are the reasons why the Curtiss -
Wright Distortion Eliminating
Voltage Regulator has been chosen
by more and more laboratories
and production test departments.
Besides general laboratory use,
this line regulator provides sim-
Electronic Component &
Instrument Sales Department
ELECTRONICS
pier, more accurate calibration of
meters ... better design of transformers,
synchros, motors . . .
easier testing of such components,
with fewer rejects . . . easier,
more accurate measurement of
magnetic properties and receiver
sensitivity . . . better a.c. computer
performance ... elimination
of fast line transient effects. Write
for details.
DIVISION
CURTISS»WRIGHT
CORPORATION CARLSTADT, N. J.
lock -in positions of the deflection
yoke with respect to the antenna,
so that a simple cam -operated servo
system is used to maintain picture
orientation.
The design of the deflection system
for the cathode -ray tube offered
some difficult problems. As
mentioned, the sweep is produced
by a rotating deflection yoke. Surrounding
this is a stationary deflection
yoke used for off -centering.
The sweep yoke requires 2 amperes
peak for one diameter of deflection;
on the fastest sweep, the voltage
across the coil is about 1000 v. The
voltage induced in the off -centering
coil by transformer action from the
sweep presented another problem.
In the off -centering coil it was necessary
to use a small number of
turns at high current to minimize
interaction from the induced voltage.
The current for the off- centering
yoke must be well regulated to
preserve picture stability. This has
been accomplished by the use of a
carrier modulator -amplifier- rectifier
combination, in which the d-c output
is maintained equal to a reference
voltage. The output voltage is
compared with the reference voltage,
and any error is used to control
the input to the carrier amplifier -
and thus the rectified d-c output of
the amplifier.
The indicator consists of a display
console and a separate equipment
cabinet. In order to ease the
maintenance problem, an effort was
made to keep as much of the equipment
as possible out of the display
console. Since the equipment cabinet
can be located out of the operations
room, it will be much more
accessible for maintenance.
The resolution obtainable from
the Engineering Model of ASDE is
shown in Fig. 4. This was obtained
during the shake -down tests of the
equipment and shows a four -engine
aircraft (DC -6) at a range of 0.4
mile. This portion of the 16 -inchdiameter
PPI is shown at full scale.
The airport was covered with snow,
and the runways are outlined by
the snowbanks along the runways.
186
For product information, use inquiry card on pages 209 -210
Tele -Tech & ELECTRONIC INDUSTRIES June 1956