E. M. WILLIAMS ET AL PORTABLE INTERFERENCE TRANSMITTER FILED FEB. 17. 1945

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81-00120R000100050019-2
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 4
• Document Creation Date: December 20, 2016
• Document Release Date: July 26, 2000
• Sequence Number: 19
• Publication Date: July 18, 1950
• Content Type: CONT

Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050019-2
July 18, 1950,
E. M. WILLIAMS ET AL
PORTABLE INTERFERENCE TRANSMITTER
Filed Feb. 17. 1945.
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 Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050019-2
UNITED STATES PATENT OFFICE
2,515:282
PORTABLE INTERFERENCE TRANSMITTER
Everard M. Williams and Edwin V. Cousy,
Dayton, Ohio
Application February 1'i, 1945, Serial No. 578,423
4 Claims. (CL 250-17
(Granted under the act of March 3. 1883, as
amended April 30, 1928; 370 0. G. 757)
1
The Invention described herein may be manu-
factured and used by or for the Government for
governmental purposes, without the payment to
us of any royalty thereon.
This invention relates to radio devices and
more particularly to a device and method for
effectuating a controlled interference of radio sic-
nals and the like, which makes them substan-
tially unintelligible upon reception.
Under some conditions it is highly desirable to
minimize or destroy the accuracy ol, and infor-
mation conveyed by, radio signals.
The objects of the present invention comprise
the provision of a. small, compact, self-contained
and self-operating device for the contemplated
purpose; a device capable of successfully radio
blanketing an appreciable area and range of sig-
nals; a radio transmitter whose repetition rate is
not impired by the presence of externally origi-
nated pulses; a device comprising a squegging
transmitter that is characterized by a positive
control over its quench cycl, ? a device that pro-
vides a continuously moving Jose pattern of rail-
ings across the screens of cathode ray tubes at
receivers to obliterate any information trace
thereon; a device wherein the quench cycle fre-
quency may be made quite high, as in the order
of 60 kilocycles and the like, that effectually pre-
vents external signals from taking control of t;]e
oscillations of a squegging oscillator part of the
device; and a device that can be produced from a
minimum number of parts at a minimum expense
and that can be assembled and rendered opera-
tive with a minimum expenditure of time and ef-
fort and that is not objectionably conspicuous.
With the above and other objects In view that
will be apparent to those who are informed in the
field of radio devices from the following descrip-
tion, an illustrative embodiment of the present in-
vention is shown in the accompanying drawing,
wherein;
Figure 1 is a schematic drawing of a preferred
circuit for the device that comprises the present
invention.
In the accompanying drawing of a self-con-
tained device that embodies the present inven-
tion a battery fed power source supplies electrical
energy to a transmitter during the active life
of the device.
The battery I is preferably of a lead-acid type
that will provide the device with a useful life of
approximately one hour. .
The negative post of the battery I is grounded
through a switch 2 to the enclosing an(, support-
'ing frame 3 of the device and to one end of a sole-
20
2
no!d 4 that operates a vibrator 5 to provide alter-
nating current t_ a transformer primary winding
6, through the contacts and connectors shown.
The oppo,~ite end of the solenoid 4 winding is con-
nected to one end of the transformer primary
winding S. The positive post of the battery 1 is
tapped Into the transformer primary winding I
intesmeiiate the ends thereof' so that upon the
depression of the switch 2 the posts of the bat-
tery 1 ore connected continuously through the
solenoid 4 and a part of the transformer primary
wiz;diag G. The opposite ends of the transformer
piitnasr! winding 6 are connected to the opposed
p'.ir of vibrator contacts 7 and 11.
Another pair of opposed vibrator contacts 9 and
10 are connected to one end of it second secondary
winding If and to one end of a third secondary
winding 12, respectively, that are fed induced
current from the primary transformer winding 8.
The first secondary winding 13 bridges the flla-
ment of a triggering oscillator 14, such as a 0001
pentode or the like, one connection continuing to
one end of an outer conductor (5 of a coaxial line
that is connected through a condenser 118 to an
23 Insulated aluminum strip 11, and the other con-
nection connected to the corresponding end of a
central conductor 18 of the coaxial line and con-
tinuing through a condenser 19 to the aluminum
strip 17.
;;o The second secondary winding I 1 is bridged by
a condenser 20. The end of the second secondary
winding II that is remote from its connection
with the vibrator contact 9, is connected through
an inductor 22 to one 23 of a pair of parallel wire
su tank circuit units. A condenser 24 by-passes ra-
dio frequency to ground from the input end of
the inductor 22. Another condenser 25 by-passes
radio frequency to ground from the end of the
third secondary winding 12 that is not connected
,lu with the vibrator contact 10.
The tansmitter portion of the circuit corn
prises the triggering oscillator tube 14, the con-
trol grid of which is connected through a con-
denser 79 to an Inductor 30 that is In parallel with
40 a resistor 31 and thence to the -300 volts ter-
minal of the vibrator 5 power supply. The in
ductt)r 30 is shunted by a capacitor 34. The
a capacitor 35 to the end of the resistor 31
,,i that is remote from its connection with the
control grid of the tube 14, and continues to
the end of the inductor 30 that is remote from
its conrection with the control grid of the tube 14.
The, screen grid of the tube (4 is also connected
bb to betvieen the resistors 32 and 33. The suppres-
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3 ,. 4
sor grid of the tube 14 is connected within the within the coaxial line that comprises the outer
tube to the filament thereof. One contact of the conductor 15 and the inner conductor i8. The
of the filament of the tube 14 are connected to the g ondary windings I i and I3 :
conductors between the opposite ends of the trans- The triggering oscillator 14, and the oscillating
filament of the tube 14 is tapped intermediate plate-cathode voltage supply for the tube 42 is
the ends of the inductor 30. The two contacts derived from the transformer second and first see-
The filament supply for the tube 42 is shielded 75 oscillator and to said triggering oscillator, and an
wires 23 and 46 form parts, and to which the an- negative to quench and regenerate the oscilla-
tenna 45 Is connected. The tuning loop 43 pro- tion of said squegging oscillator once for each
vides means by which the set is pretuned on the cycle of said triggering oscillator, a power means
frequency of the signal that it is desired to jam. for supplying electrical energy to said squegging
cludes the parallel wire tank circuit of which the 70 applied to drive the grid alternately positive and
nating current ao provided is fed through the 3. A jammer for supplying signals that are free
circuits and components shown and emitted s3 05 from being locked to the pulse repetition rate of
ings 11, 12 and 13 by operation of the solenoid gering oscillator being higher than the pulse repe-
4 and vibrator 5 in known manner. The alter- tition rate of said detection system.
tery I in the three transformer secondary wind- triggering oscillator, the frequency of said trig-
fectualiy obliterated. signal from said triggering oscillator alternately
The operation within the jammer set comprises to quench and regenerate the oscillation of said
the induction of alternating current from the bat- 80 squegging oscillator once for each cycle of said
ray tubes. so that the pips move continuously ing set for impairing the usefulness of a radio
across the screens of the sets. The. generated and pulse-echo object detection system, comprising a
emitted pulses are of sufficient amplitude, fre- 65 power source, a triggering oscillator energized by
quency and intensity so that the plane position said power source to supply an oscillating quench
indicating reflection pips upon the sets are ef- signal, and a squegging oscillator receiving the
anu tq a sending antenna 45. The other wire 4$, and substitutions may be made therein without
of the pair of parallel wire tank circuit units, Is departing from the present invention as defined
connected at one end to the grid of the tube 42 by the appended claims.
and its opposite end in connected to the antenna What we claim is:
connected end of the wire 23 through a capacitor 40 1. A jammer for jamming radio pulse r-ignals
47 and through the resistor 48 and the capacitor having a predetermined repetition rate, compris-
38 to the aluminum strip 17. ing a triggering oscillator supplying an oscillat-
In operation the varlo,is components of the de- Ing quench signal, and a squegging oscillator to
vice preferably are enclosed within a conducting the grid of which the oscillating quench signal
metal container that provides the ground 3. One 43 from said triggering oscillator Is applied direct-
manner of using the device is to drop it over areas ly to drive the grid alternately positive and neg-
in groups of units, that are individually provided ative and thereby quenching and regenerating
with parachutes, balloons or the like, from alti- the oscillation of the squegging oscillator once
tudes that permit the use of the full life of the for each cycle of said triggering oscillator, the
battery I. 50 frequency of said triggering oscillator being high-
When functioning, the jammer produces a series er than said repetition rate.
of closely spaced pips upon the screens of cathode 2. A radio energy interference signal generat-
former first secondary coil 13. and the Inner con- circuit that is associated therewith, generate' a
ductor I$ and the -outer conductor IS of the co- quench voltage supply. The plate-cathode volt-
axial line so that these conductors are bridged by age supply for the tube 14 comes from the trans-
the filament of the tube 14 intermediate the ends 10 former second secondary winding I I and from
thereof. The plate of the tube 14 is grounded the transformer third secondary winding 12.
through a resistor 36 and the conductor contit-ues The oscillating quench signal that is derived
through a capacitor 37, a resistor 48 and a tank from the plate of the triggering oscillator tube 14
circuit wire 46 to the control grid of a. self- is applied directly to the grid .of the squegging
quenched, or squegging, oscillator tube 42. 15 oscillator tube 42 and drives it alternately posi-
The triggering oscillator 14 forces the squeg- tive and negative to quench and regenerate the
ging oscillator 42 to pulse at a definite rate that oscillations of the tube 42 once for each cycle.
is higher than any radar pulse rate that Is picked The quench cycle is timed to a much faster. rate
up by the device.. The squegging oscillator 42 than the pulse repetition rate of the radar radio
comprises a cathode that has both of its terminals 20 energy that is to be jammed, and hence the pulse
connected to the eiid of the outer conductor 15 of of the received signal cannot take control of the
the coaxial line that is remote from the ena of oscillations of the squegging oscillator tube 42.
the outer conductor 15 that is connected with In general, the quench frequency will be incom-
the transformer first secondary winding 13. one mensurate with the pulse repetition rate of the
terminal of the heater of the tube 42 is connected 25 signal to be jammed so that a general blur over
to the same end of the coaxial line outer con- the whole field of the presentation upon the screen
ductor 15 and its other terminal connected to the of the receiving cathode ray tube will be produced.
corresponding end of the coaxial line inner con- thereby obscuring any true echoes which might
ductor 18. A tuning loop 43, or other suitable appear thereon.
means, that is adapted for rotation about an axis 30 It is to be understood that the particular com-
44 in and out of the field of the inductor 22, is bination of circuits and components that are
provided for adjustably tuning the inductor 22. shown and described herein, have been presented
The wire 23, of the pair of parallel wire tank cir- for the purposes of illustrating and describing a
cuit units, is connected at one end to the plate of suitably operating embodiment of the present in-
the tube 42 and at Its opposite end to the choke 22 35 vent.on and that various modifications, changes
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antenna for emitting output of said squegging
oscillator, the frequency of said triggering oscil-
lator being higher than said repetition rate.
4. A Jamming transmitter for
lamming radio
Pulse signals, comprising a triggering Oscillator 6
SUPplying a periodic quench signal, a squegging.
Oscillator whose squegging operation is positively
controlled by the quench signal from said trig-
gering oscillator, said quench signal being nor-
m. ally of a higher frequency than the pulse rate 10
of a signal to be Jammed.
EV R.ARD AL WILLtA S
EDWIN V. COUSY.
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