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Патент USA US2113225

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April 5, 1938.
ì
l. woLFF
2,113,225
'FREQUENCY CONTROLLED‘ELECTRONIC OSCILLATOR
Filed Jul-y 25, 1936
NYëek
ßnventor
ßâgyf
(Ittc'xneg
Patented Apr. 5, 1938
. „22.113,35
UNITED sTMiz-sA PATENT ' iol'frflfÁczfa„
FREQUENCY ooNTnoLLED ELEc'rtaoNio
osoILLAToR -
Irving Wolff, Merchantville, N. J., assigner `to
Radio Corporation of America, a corporation
of Delaware
Application July 25, 1936, Serial N0. 92,614
6 Claims.
In its broad aspects, this invention relates
to electronic oscillators. More specifically, the
(Cl. 179-171)
megacycles.
invention is a carrier frequency -control for a
modulated
Ul
electronic
oscillator.
y
'
'
An electronic oscillator or magnetron may be
used to generate ultra high frequency oscilla
tory currents; i. e., currents of a frequency of
thirty megacycles and upwards. If a magnetron
oscillating at three thousand magacycles, by Way
of example, is modulated, the modulation cur
rents Will not only modulate the amplitude of
the oscillations but will greatly vary the fre
quency of the carrier current. This invention
contemplates stabilizing the frequency of the
carrier current of a> modulated magnetron’ oscil
lator.
’
One of the objects o-f my invention is to pro
vide means for stabilizing the frequency of an
electronic oscillator. Another object is to -pro
vide an oscillator for controlling the frequency
of the carrier currents of a modulated mag
netron oscillator.
`
A further object is to provide means for pre
venting a controlling oscillator from being af
fected by the oscillator to be controlled.
In the accompanying drawing, Fig. 1 repre
sents a schematic illustration of my invention,
and
Fig. 2 is a circuit diagram of a modulated
vmagnetron oscillator Whose carrier frequency is
controlled.
`
Referring to Fig. 1, a magnetron oscillator I
is adjusted to establish a carrier frequency of
3000 megacycles, by Way of example. Signalling
-or modulating currents are impressed on the
oscillator I by a modulator 3. The effect of the
modulation currents is to vary both the ampli
tude and frequency ofthe carrier current. rI_‘lie
frequency may be stabilized or controlled Aby im
pressing` currents of carrier frequency, which
are unmodulated, on the modulated oscillator.
If the control currents of carrier frequency are
impressed directly from the control oscillator
5 on the unmodulated oscillator I, the resulting
frequency Will be determined by the relative re
action of the two oscillators. 'I'hat is, the con
trol oscillator 5 may control the oscillator I or
be controlled by that oscillator.
The interaction may be prevented by gener
50 ating currents of a frequency of 1500 mega
cycles. The currents of 1500 megacycles fre
quency are transferred to the oscillator I through
a frequency doubler 'I. The frequency doubler,
as the title implies, increases the control fre
55 quency currents from 1500 megacycles to 3000
The frequency doubler not only
increases the frequency but it also prevents con
trolled and controlling oscillators from inter
acting. Thus the oscillator ’I is 'frequency con
trolled or stabilized by the control oscillator 5.
Modulation currents may now be impressed on
the oscillator I and Will vary the amplitude of
-5
oscillation Without varying the frequency of the
carrier
currents.'
’
'
'
`
’
'
One embodiment of my invention is `.illustrated l io
in Fig. 2.> 'I‘he'magnetronfoscillator’âl is com
posed of Van evacuated envelope.' I I. ' A pair of
anodesï I34 and a cathode 'I5 are suitably.v mount
ed vWithin the envelope III. A magnetic ñeld,
Whoselines of forceare substantiallyv parallel to (155
and surround the fcatho'de, is establishedby a
solenoid I‘I', permanent Írnagnet, or the like. The
solenoid I1 may beßenergized by a battery I9.
The cathode I5 is heated' by a battery‘2l. The
anodes I3Vare' connected to a resonant >trans
mission line 23 »which terminates in a dipole
antenna 25. The anode circuit is comprised of
an anode battery 21, which is serially connected,
through the secondary 29 of a Ymodulation trans
former 3l and-radio frequency choke coil 33,@2
to la point intermediate lthe ends of the ydipole
25. The modulation is effected by a microphone
35 which is connected through a battery 31 to
thev primary 39 of the modulation transform
er
3|.
'
'
"
‘
The circuit thus farydescribed is a conven
tional Amodulated"'magnetronv oscillator 9. The
control oscillator 4I,'_Which'operate`s at half the
carrier frequency of themodulated oscillator 9,
is comprised of an evacuated envelope 43 which «
includes a cathode 45 and a pair of anodes 41..
'The envelope is surrounded by a solenoid- 49
Which is energized by a battery, 5I. The cathode
45 is> energized'by- a ybattery 53. The anodes
4‘I are connected to a resonant transmission line 'T40
55.` An anode battery 5‘I is connected> from the
cathode 45 through a radio frequency> choke
coll 59 to the mid-point of the transmission
line 55.
The transmission line 55 is suitably coupled 45
to another transmission line 6I. The latter
transmission line is terminated in a full wave
rectifier 63, Whose output currents are of double
the frequency of the input currents. vThe out
put of the rectiñer is impressed on a pair of 50v
enclosed quarter Wave lines 65, 61 between ter
minals which offer a suitable impedance match
for the full Wave rectifier, or frequency doubler.
The quarter Wave lines 65, 61 are respectively
connected to the transmission line 23 by leads 55
2
2,113,225
69, 1I which include "trombones” 13, 15 or the
like, for tuning the connecting lines ‘S9-‘l I. The
several transmission lines may be terminated in
sections of line which offer suitable impedances.
Inasmuch as constant frequency is desired, the
oscillators and transmission lines should be care
fully designed and constructed to minimize
changes caused by the ambient temperature, vi
bration, voltage variations, and the like.
Thus I have described a modulated magnetron
10
oscillator. The carrier frequency currents gen
erated by this oscillator are controlled. The con
trolling oscillator creates unmodulated oscillatory
currents which have half the frequency of the
15 modulated carrier currents. The frequency of
the controlling oscillator currents is doubled by
full Wave recti?iers or the like. The controlling
currents of the frequency of the carrier are im
pressed through suitable transmission lines on
20 the modulated magnetron oscillator to stabilize
or control the frequency of the carrier currents
a magnetron oscillator for generating carrier fre
quency currents, means for impressing modulat
ing currents on said oscillator, a second oscillator
for generating currents of less than said carrier
frequency, means for multiplying the frequency
of said controlling currents to equal the carrier
frequency, a pair of quarter wave resonant con
centric lines for stabilizing said multiplied fre
quency currents, means for impressing said mul
tiplied frequency currents on said pair of con
centric lines, and means for impressing said
stabilized multiplied frequency currents on said
magnetron oscillator to thereby control said car
rier frequency currents.
4. An ultra high frequency signalling system 15
comprising, in combination, a magnetron oscilla
tor for generating carrier frequency currents,
means for modulating said carrier frequency cur
rents with signal impulses, a second oscillator
for generating controlling currents of half said
carrier frequency, means for impressing currents
and thereby prevent frequency modulation.
from said second oscillator on a full Wave recti
Although I have chosen magnetron oscillators
to illustrate my invention, it should be under
fier, a pair oi' enclosed quarter wave length lines
resonant to the output currents from said recti
fier for stabilizing the frequency of said rectifier
currents, means for impressing said rectified cur
rents on said quarter Wave length lines, and
means for impressing the output currents thus
25 stood that Barkhausen-Kurz or any type of ultra
high frequency oscillator‘may be used.
Like
Wise the controlling frequency may be made less
than half of the carrier and multiplied by more
than two to control the carrier frequency.
30
I claim:
1. An ultra high frequency system comprising
an ultra high frequency oscillator for generating
carrier frequency currents, means for impressing
modulating currents on said oscillator, a second
stabilized on a transmission line coupled to said
magnetron oscillator for controlling the fre
5. The method of controlling the frequency
of modulated ultra high frequency carrier cur
rents by means of a concentric resonant line
35 oscillator for generating currents of less than
which comprises generating an ultra high fre
said carrier frequency, means for multiplying the
frequency of said controlling current to equal the
carrier frequency, a pair of resonant lines for
stabilizing the frequency of said multiplied fre
40 quency currents, means for impressing said mul
tiplied frequency currents on said pair of reso
nant lines, and means for impressing said multi
plied and stabilized frequency currents on said
ultra high frequency oscillator to thereby control
45 said carrier frequency currents.
2. An ultra high frequency system comprising
an ultra high frequency oscillator for generating
carrier frequency currents, means for impressing
quency carrier current, modulating said carrier
modulating currents on said oscillator. a second
oscillator for generating currents of -half said
carrier frequency, means for doubling the fre
quency of said controlling currents, a pair of
quarter wave resonant lines for stabilizing the
frequency of said doubled frequency currents,
55 means for impressing said doubled frequency cur
rents on said pair of resonant lines, and means
for impressing said doubled and stabilized fre
quency currents on said ultra high frequency os
cillator to thereby control said carrier frequency
60 currents.
3. An ultra high frequency system comprising
30
quency of said carrier currents.
current, and generating an unmodulated con
trolling current of a frequency equal to said car
rier, stabilizing the frequency of said unmodu
lated controlling current by applying said cur 40
rent to said concentric resonant line, and apply
ing said frequency stabilized controlling current
to said modulated ultra high frequency car
rier to control the frequency of said carrier cur
rents.
6. The method of controlling the frequency of
modulated ultra high frequency carrier currents
by means of a resonant line which comprises
generating an ultra high frequency carrier cur
rent, modulating said carrier current, generating
an unmodulated controlling current of lower fre
50
quency than said carrier frequency, multiplying
said lower frequency current until its frequency
equals said carrier frequency, stabilizing the fre
quency of the currents of said multiplied fre 55
quency by applying said multiplied frequency cur
rents to said resonant line and impressing said
multiplied and stabilized frequency current on
said modulated ultra high frequency carrier to
control the frequency of said carrier currents.
IRVING WOLFF.
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