PORTABLE INTERFERENCE TRANSMITTER

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81-00120R000100050001-1
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 4
• Document Creation Date: December 20, 2016
• Document Release Date: July 26, 2000
• Sequence Number: 1
• Publication Date: July 18, 1950
• Content Type: CONT

-mow _
Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050001-1
July 18, 1950 E. M. WILLIAMS ET AL
PORTABLE INTERFERENCE TRANSt(ITTER
Filed Feb. 17, 1945
2,515,282
0-1
Y J J
ItdVENTOR
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~'`' Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050001-1
 Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050001-1
Patented July 18, 1950
2,515,282
UNITED STATES PATENT OFFICE
2,515.282
PORTABLE INTERFERENCE TRANSMITTER
Evcrard M. Williams and Edwin V. Cousy,
Dayton, Ohio
ApplicationFebruary 17, 1945, Serial No. 578,423
4 Claims. (Cl. 250-17)
(Granted under the act of March 3, 1883, at
amended April 30, 1928; 370 O. G. 757)
The Invention described herein may he manu- noid 4 that operates a vibbrator 5 to provide alter-
factured and used by or for the Government for hating current to a transformer primary winding
governmental nun osPs, w ;..bout the payment to 8, through the contacts and connectors shown.
us of any royalty thereon. The opposite end of the solenoid 4 winding is con-
This Invention relates to radio devices and 3 nected to one end of the transformer primary
more particularly to a d-:iee and method for winding-6. The positive post of the battery I is
effectuating a controlled in-erierence of radio sir- tapped Into the transformer primary winding 6
nals and the like, which makes them substan- intermediate the ends thereof so that upon the
tially unintelligible upon rec:.ption, depression of the switch 2 the posts of the bat-
Under some conditions it, s highly desirable to 10 tery I are connected .continuously through the
minimize or destroy the accuracy of, and Infor- solenoid 4 and a part of the transformer primary
mation conveyed by, radio s gals. winding S. The opposite ends of the transformer
The objects of the prose -t invention comprise primary winding 6 are connected to the ol:iposed
the provision of a small, ce=;pact, self-contained pair of vibrator contacts T and 8.
and self-operating device for the contemplated 18 Another pale of opposed vibrator contacts 9 and
purpose; a device capable of successfully radio 10 are connected to one end of a second secondary
blanketing an appreciable a:+ea and range of sig- winding I I and to one end of a third secondary
nals; a radio transmitter r~*}cP rP-,~titir z ra is winding 12, respectively, that are fed induced
.not impir
ed by the preser_c nfe eternally or current from the primary transformer winding 6.
ed iz~sss; a device comprising a squegging 20 The first secondary winding 13 bridges the fila-
transmitter. . at is charae-er:zed by a positive ment of a triggering oscillator 14, such as a 9001
control over Its quench cyr- = a device that pro- pentode or the like, one connection continuing w
vides a continuously movir_. Jose pattern of rail- one end of an outer conductor 15 of a coaxial line
-logs across the screens of cathode ray tubes.at that Is connected through a condenser 16 to an
receivers to obliterate an v information trace 25 Insulated aluminum strip 17, and the other con-
-thereon; a device wherein the quench cycle fre- nection connected to the corresponding end of a
quency may be made quite high, as in the order central conductor 18 of the coaxial line and con-
of 60 kilocycles and the like- that effectually pre- tinuing through a condenser 19 to the aluminum
vents external signals from taking control of t;re strip IT.
oscillations of a squeaging oscillator part of the The second secondary winding I I is bridged by
device; and a device that can be produced from a a condenser 20. The end of the second secondary
minimum number of parts at a minimum expense winding I I that is remote from its connection
and that can be assembled and rendered opera- with the vibrator contact 9, is connected through
tive with a minimum.expend t_;re of time and ef- an Inductor 22 to one 23 of a pair of parallel wire
fort and that is not objectionably conspicuous. 30 tank circuit units. A condenser 24 by-passes ra
With the above and other objects In view that dio frequency to ground from the Input end of
will be apparent to those w to are informed In the the inductor 22. Another condenser 25 by-passes'
field of radio devices from the following descrip- radio frequency to ground from the end of the
tion, an illustrative embodi-?ent of the present in- third secondary winding 12 that is not connected
vention Is shown in the acc-cmpanying drawing, 4u with tha vibrator contact 18.
wherein; The transmitter portion of the .circuit com-
Figure 1 Is a schematic drawa-.ing of a preferred prises the triggering oscillator tube 14, the con-
circuit for the device that ca=prises the present trol grid of which is connected through -a con-
invention. denser 29 to an Inductor 30 that is in parallel with
In the accompanying drawing of a self-con- 43 a resistor 31 and thence to the -300 volts ter-
tained device that embod:, the present inven- minal of the vibrator S power supply. The in-
lion a battery fed power so_ supplies, electrical ductor 30 Is shunted by a capacitor 34. The
~:0 nergy to atransmitter d-m ng the active life screen grid of the tube 14 is connected through
fthe device. a capacitor 35 to the end of the resistor 31
The battery i Is preferably of a lead-acid type :.a that is remote from its connection with the
that will provide the device with a useful life of control grid of the tube 14, and continues to
approximately one hour. the end of the inductor 30 that is remote from
The negative post of the ba tery I is grounded its connection with the control grid of the tube 14.
through a switc z 2 to the env osing and support- The screen grid of the tube 14 Is also connected
Aug frame 3 of the device and to one end of a sole- bb to between the resistors 32 and 33. The suppres-
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 Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050001-1
w
i tudes that permit the use of the full life of the for each cycle of said triggering oscillator, the
battery p1. 50 frequency of said triggerh.g oscillator being high-
Is,i ,, s,,,ta,,ano this tammer produces a series er than said repetition rate.
metal container that provides the ground 3. Line 43._from said triggering oscuuaror is appnea uzrea;i-
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
ith arachutes balloons or the like, from alti- the oscillation of the quegging oscillator once
bi1L VUbkI as a'.' &' .-" r., ....-u .??. __-------- - .
through a capacitor 37, a resistor 48 and a t=.r_k 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. lu- oscillator tube 42 and drives it alternately posi-
The triggering oscillator 14 forces the s ucg- tivo 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 end of the outer conductor 15 of - of the received signal cannot take control of the
the coaxial line that Is remote from the end 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 lammed 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 s-.zitable appear thereon.
means, that is adapted for rotation about an axis 30 It is to be understood that the particular coan-
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 clicke 22 33 vention and that various modifications, changes
and to a sending antenna 45. The other w:--e 46, 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 t, .:!>e 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 rignals
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 various components of the de- ing quench signal, and a squegging oscillator to
2,015,282
4
within the coaxial line that comprises the outer
.conductor 15 and the inner conductor 18. The
plate-cathode voltage supply for the tube 42 is
derived from the transformer second and first see-
{, ondary windings If and 13.
The triggering oscillator 14, and the oscillating
circuit that is associated therewith, generate, a
quench voltage supply. The plate-cathode volt-
age supply for the tube-14 comes from the trans-
lo former second secondary winding . I I and from
the transformer third secondary winding 12.
sor grid of the tube 14 is connected within the
tube to the filament thereof. One contact of the
filament of the tube 14 Is tapped inter?nate
the ends of the inductor 30. The two contacts
of the filament of the tube 14 are connected to the
conductors between the opposite ends of the t: ans-
former first secondary coil 13 and the inner con-
ductor 4 and the outer conductor 15 of t ht co-
axial line so that these conductors are bridged by
the filament of the tube 14 intermediate,ti-.e c-nels
thereof. The plate of the tube 14 is grounded
1 21114 YLN12LYVl V ?-. f.-v?-- -a........... ---- -- -- ------- -
nating current so provided Is fed through the 3. A jammer for supplying signals that are free
circuits and components, shown and emitted as 05 from being locked to the pulse repetition rate of
radio frequency energy pulsations from the send- another signal, comprising a triggering oscillator
Ing antenna 45. supplying an oscillating quench signal, a squeg-
The squegging oscillator 42 Is associated with ging oscillator to the grid of which the oscillatin$
a very- high frequency oscillator circuit that in- quench signal from said triggering oscillator is
cludes the parallel wire tank circuit of which the 70, applied to drive the grid alternately positive and
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 cn?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
The filament supply for the tube 42 Is shielded 75 oscillator and to said triggering oscillator, and an
tery I in the three transformer secondary wind- triggering oscillator, the frequency o sa s-
ings I I, 12 and 13 by operation of the solenoid gering oscillator being higher than the Pulse repe-
of closely spaced pips upon the screens of cathode 2. A radio energy interference signal genera
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, ire- 55 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
factually 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- 50 squegging oscillator once for each cycle is said
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 Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050001-1
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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 jamming radio
pulse signals, comprising a triggering oscillator b
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-
mally of a higher frequency than the pulse rate 10
of a signal to be jammed.
EVERARD M. WILLIAMS.
EDWIN V. COUSY.
6
REFERENCES CITED
The following references are of record In the
file of this patent:
UNITED STATES PATENTS
Number
2,076,168
Name Date
Turner _____.------- Apr. 6,
1937
2,181,568
Kotbwski et al. ___--_ Nov. 28,
1939
2,412,710
Bradley ---------- Dec. 17,
1939
2,235,010
Chaffee ----------- 74ar, 18,
1941
2,266,401
Reeves -------- --- Dec. 16,
1941
2,379,899
Hansell -- July 10,
1945
2,419,569
Labin et'al. -------- Apr. 29,
1947
2,419,579
Labin et al. -__-___- Apr. 29,
1947
2,426,021
Hausz et al. -_------ Aug. 19,
1947
Approved For Release 2007/09/21 : CIA-RDP81-0012OR000100050001-1