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2,408,406
Patented vOct. 1, 1946
UNITED? * STATES
orifice
v
ELECTRICAL
,_
.-.2408406
APPARATUS
,
o
n
_
.Hugoïfßenioii -La Canada, Qaliflfassigno?fby»
mesne‘assignments, to SubmarineSignaLCom-JÁ,
‘
pany, Boston, Mass., a corporation-of Delaware `
original 'application April so, 194,1, serial ' NO_.I >
391,153,..l_ Divided and. this application October
, 8, 1941, Serial No. 414,133
3 claims. `(c1. 25o-"arf A
1
,
material transparent to waves _suchvî as Bakelite.'I T
The present> application _is a division of my`
copending applicationl Serial No. 391,153, >filed
Apr11/ß_0.1941.-
,
-
.
,.
„
glass'or ceramic. -Mounted on the bas'e 1'1of the" '
casing'is av supporting bracket V8` containing the
„
sparklovscillating device 9 of the general type'de-L ’ ’
scribed in my 'cope'nding' ’ application' Serial ' No.
Theßltesent Mention. relates.„tol Short Wave
transmitting> apparatus and particularlyto spark
362,434, med' october'l 23,' 1940. but 'differing in '
certainv respectsy
willbe -described later-; "
Two high-¿tension insulators "I3 and- II are’
The present inventionfurther relates to a
mounted in the'b‘ase‘ 1 of the'c'hamberl and pro'
method land apparatus> „for accurately controlling
the _timemofy emission of , electromagnetic wave 10 vide ai support 'respectively for the- conductors" I2
transmissionof very high frequency electromag
netic
.Waves
v_
_
.
f
,
_
and '1_3 in 'series with'eac'h of whichïare resis
trains.atAu1tra-highfrequencies in the range ap
proiçi, vately of. ßgûmegacyclesand producing very
shortßignalimpulses forthe purposes yof direc
tive radiation with the use of a radiating horn'
if flesiured.V
..
'
.
~.
-
tors I4 and'IS and'thesparkg'aps ’I6 andv I1, re
spect'ively.'
and 2| tapering to center points.22 and -23 which
The presentinvention further is concerned with
the production and radiation o_frincreased power
at theseîvery,highvfrequenciesand to this'end
employs aspecial type of .high- frequency tank
oscillator in which increased powermay be de
Thev spark gaps"I3 and I1 are op-L. .
posed to the terminals I8 and I9, respectively,
15 which,V in turn, connect to the 4metallíccones'20.
are preferably ofsome, hard »metal suchas tung-V `
sten. The cones 20 and 2I,are supported by mica
>insulating plates 24 and 25,.respe`ctively, which
20 are mounted at the ends of the element 23 which
is cylindrical in its outer shape .with 'the interior
veloped,y „Thisoscil1ator preferably contains in
hollowed out to the shape of cones so that the "
series a main spark gap and two auxiliary spark
inner surfaces 21 and 28 are respectively spaced
gaps although the\.auxiliary spark gaps may be
away from the sides of the cones 20 and 2 I.
eliminated in the operation of the system. The
power is supplied to this series circuit through the 25 The element 26 at its end has flat sections 25
secondary of an air core transformer the pri
mary of which is operated by a condenser dis
and 30 against which the mica insulating sheets
i 24 and 25 are held fast. In back of the casing 2
charge tube controlled or triggered periodically
in a second chamber 3|, which need not be air
«by means of a control tube, preferably a. thyra
tron. The circuit formed by the discharging con
tight, is mounted an air core transformer 32 whose
- denser, the tube and transformer are arranged to
30
secondary 33 supplies power to the spark tank
circuit and the primary 34 of which is connected
through the concentric cable 35 to the power
supply source which is more completely described
in Fig. 6.
In Fig. 6 the air core transformer 32 with the
have sufficient resistance to provide a highly
damped type of oscillation so that only vthe initial
oscillation will operate the circuit.
Further advantages and features of the present
output secondary 33 and the input primary 34
invention will be understood from the speciñca
_ may be operated and controlled through a circuit
tion below taken in connection with the draw
in which the thyratron tube 41 initiates the dis
ings in which Fig. 1 shows a 'vertical section
charge through one of the condensers C1, C2 or C3
through the apparatus; Fig. 2 shows a modified
detail of an element shown in Fig. l; Fig. 3 shows 40 through the proper connection of the switch 44.
The condensers C1, C2 and C3 are charged by the
a section on the line 3-3 of Fig. 4; Fig. 4 shows
direct current high potential source indicated at
a top view of the detail shown in Fig. 2; Fig. 5
46 through one of the resistances R1 to R5 de
shows a section on the line 5-5 of Fig. 1; and
pending upon the position of the switch 45. The
Fig. 6 shows a circuit diagram which may be used
45 condensers are discharged by means of the thyra
in connection with any of the figures.
tron tube 41 the grid of which is Ábiased by the
In Fig. 1 there is provided an airtight chamber
battery 48 in series with a triggering oscillating
I within a casing 2 which may be made of metal
, or conducting material with a valve 3 at one side
source 49 which may be sinusoidal peaked or saw
through which air or gas may be pumped under
pressure. The top of the casing is covered by a
toothed in shape and may periodically furnish a
suñicient potential to the grid to initiate the dis
charge of the condenser circuit between the cath
plate 4 which hermetically seals the casing by
means of the bolts 5, 5, etc., extending all the
ode and anode of the thyratron tube 41, and thus
control the time of spark discharge. When the
thyratron 41 breaks down, the resistance R1 to
the top and the clamping edge and composed of 55 R5 connected in circuit is substantially shorted,
way around the periphery and clamping the cover
to the easing with an airtight seal 6 in between
2,408,406
3
4
but the damping of the discharge is controlled by
the adjustable resistance 43 to provide one major
gaseous discharge tube having its anode con
nected through said resistance to said powerl
oscillation with only minor subsequent ones insuf
iicient to cause a breakdown of the oscillator
source on one side thereof and its cathode to
said power source on the other side thereof and
spark circuit.
In the operation of the system shown in Fig. 1,
the tank circuit is charged across from the spark
point I5 to the spark point Il which, in turn,
means for supplying a potential to said grid at
predetermined times to operate said circuit.
2. An ultra-high frequency electromagnetic
spark oscillating system, comprising, in combina
tion, an electromagnetic spark oscillator, a charg
breaks down with the breakdown of the sparking
points 22 and 23, thus causing an oscillation of 10 ing circuit comprising a power source, an air core
transformer having its secondary connected to
electrical energy in the cones 20 and 2l and a
radiation in the direction of the horn 50.
In the modiñcation shown in Figs. 2, 3 and 4
an arrangement showing substantially half of
the member 9 is illustrated. In this case the cen
said spark oscillator, a condenser and a resistance
all in series with each other, a grid controlled
gaseous discharge tube having its anode connected
15 through said resistance to said power source on
one side thereof and its cathode to said power
source on the other side thereof and means for
shell 52 by means of the mica disc 53 through
supplying a potential to said grid at predeter
the screws 54 holding the cone 5I to the mica
mined times to operate said circuit and resistance
and screws 55 holding the mica disc to the ex
ternal cone 52. A uniform space 56 is provided 20 means connected in series with said transformer
to control the damping in the operation of said
between the elements 5| and 52. At the apex
circuit.
~
,
of the cone 5l there is attached a tungsten other
tral conical element 5l is supported by the conical
sparking point 5l which is opposed by the point
3. An ultra-high frequency electromagnetic
tenna t2 which may be of such a vdimension as
source on one side thereof and its cathode to
said power source on the other side thereof
and means for supplying a potential yto said
spark oscillating system, comprising, in combina
53 adjustably positioned by means of the screw
5S on which the spark 55 is mounted. The screw 25 tion, an electromagnetic spark oscillator, a charg
ing circuit comprising a power source, an air core
59 threads through the cylindrical end 6U of the
transformer having its secondary connected to
element 52 and permits an adjustment by means
said spark oscillator, a condenser and a resistance
of the screw 5S of the spark gap along the center
all in series with each other, agrid controlled
axis of the cone. A window El is provided so that
the adjustment of the gap may be properly viewed. 30 gaseous discharge tube having its anode con
nected through said resistance to said power
. Mounted in the cone elementV 5I may be the an
to provide the desired resonance in tuning of the
system. This unit may be substituted for the
unit 9 in Fig. 1.
Having now described my invention, I claim:
1. An ultra-high frequency electromagnetic
spark oscillating system, comprising, in combina
tion, an electromagnetic spark oscillator, a charg~
ing circuit comprising a power source, an air core
transformer having its secondary connected to
said spark oscillator, a condenser and a resistor
all in series with each other, a grid controlled
grid at predetermined times to operate said
circuit and resistance means connected in series
with said transformer to control the damping of
the discharge of said circuit by providing substan
tially one major electrical oscillation for the oper
ation of said spark oscillator with only subse
quent vminor oscillations incapable of operating
said spark oscillator.
HUGO BENIOFF.
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