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fDeC- 10, 1946'
' Filed June 17, ¿§45
8 .Sheets-Sheet 1 _
igt-N rolas'
Déc. 10,1946.
Filed June 17, -1943
w@äv1whl. »a.m
' 8 sheets-sheet 2
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"Dea 10, 1946.
`Filed AJune 1'17, 1943
8 Sheets-Sheet 4
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0.190 ernen
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Dec. 1o, 1946.
2,412314 4
Filled June 17., 1945
8 Sheets-Sheet
Dec. l0, 1946. `
Filed June 17, 1945
8 Sheets-Sheet 6
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Dec. l0, 1946.-
2,412,314 ,
Filed June 17, 1945
8 she'ets-sheet 7
IN1/EN Topp’
. ßo armer
Dec. 10, 1946.
Filed June 17, 1943
-8 Sheets-Sheet 8
Patented Dec. 10, 1946
Thomas James Boerner, Collingswood, and John
W. Sanborn, Merchantville, N. J., assignors to'
Radio Corporation of America, a corporation of
Application June 17, 1943, seria1N0.491,164
11 Claims.
(c1. 25o-16)
This invention relates to high frequency'ap
`paratus and especially to the power amplifier
stages of high frequency transmitters.
Oneobject of the invention is to provide im
proved high frequency vacuum tube power am
plifying apparatus and circuits which shall op
secure iiow of equal grid currents over a
operating range.
The tank circuit of the power amplifier gen
erally consists of a pair of conductors fixed in
position, having substantially uniformly distrib
uted inductance and capacity and another -pair
erate at high efficiency and'- in which spurious
of similar conductors insulatingly supported upon
effects such as parasitic oscillations are mini
a movable metallic plate.
mized,v A further object of our invention is to
able conductorsV having uniformly distributed
electrical capacity and inductance are connected
provide high frequency amplifying _apparatus
These ñxed and mov
wherein the frequency of operation may readily
together by ñexible straps. Mechanical instru
and conveniently be changed.
mentalities `are provided for moving the metal
A further object_of the present invention is
lic plate upon which the movable conductors are
to provide an improved high frequency tank cir
mounted so that the effective separation of the
cuit for vacuum tubes. A feature of the tank 15 conductors may be varied, thereby varying the
circuit resides in an arrangement of fixed and
effective inductance ofthe tank circuit. As the
relatively movable conductors Awhich are so con
conductors of the tank are moved closer together,
nected and arranged as to form a variable in
the inductance is increased and, similarly, as the
ductor for the tank circuit. In this` regard pro
separation between the conductors is vincreased
vision is `made for varying the spacing between 20 the inductance of the tankcircuit is decreased.
the conductors of the inductorsystem, thereby
A final output circuit» is provided coupled to
-.varying the effective inductance connected into
the tank circuit. This final output circuitalso
y ,
makes use of conductors having substantially?uni
A further object of the present invention is to
formly distributed inductance and capacity form
.provide an improved high frequency output cir 25 ing the effective inductance of the output circuit.
cuit which may be employed with high frequency
Variable and fixed condensers are also provided
power amplifiers, generators and similar appa
which form part of the >output circuit. The units
ratus. An important feature Aof thisA output cir
of the output circuit are mounted as `a single
cuit resides in an arrangement whereby the’ tun
unitary assembly which may be variably cou
ing of the output circuit may be changed :with 30 Apled to the tank »circuit without substantially
out altering the coupling to the circuitfeeding
changing the tuning ofthe output circuit and,
it and whereby the aforementioned coupling> may
furthermore, instrumentalities are provided for
be varied without producing any substantial
changing the tuning of the output circuit with
change in the tuning of the'output circuit.
out substantially altering the coupling thereof
with the tank circuit of the power amplifier. I
A further general object of the invention is to
provide an improved electrical and mechanical
vReversible electric motors are provided for ad
arrangement of parts constituting the power am
justing neutralizing and tuning condensers ofthe
plifier of a high frequency transmitter, which
power amplifier stage and output circuit. Fur
arrangement may readily be adjusted for opera
ther instrumentalities under control offother re
versible electric motors are provided for adjust
tion over avwide range of frequencies,
ing >the separation of the conductors ofthe tank
In brief, certain features of the present inven
circuit and, hence, the effective electrical in
tion may be outlined as followsz* `
A push-pull connected vacuum tube driver stage
is coupled through a condenser-divider arrange
ment to a push-pull connected vacuum tube pow
er amplifier. The condenser-divider operatesin
such a way that over a wide range of operating
frequencies substantially constant radio fre
quency excitation is applied to the grids of the
y power ampliñer with constant direct current volt
agev impressed upon the plates of the driver tubes.` Y
In this connection it mayalso _be mentioned that
biasing circuits are providedîfor the ¿grids of the
ductance thereof and also for adjusting the cou
pling between the output circuit assemblyand
the tunable tank circuit. Limit switches' are
provided for the motors so as to prevent` them
Vfrom over-running in either direction.- Instru
mentalities are also provided'whereby each A’re
versible electric motor drives the variable arm
of a potentiometer. Each potentiometer sup
plies voltage to a separate tuning indicator which
may be in the form of a volt meter. In vthis way
the tuning indicators give a measure, by theA re
spective volt meter readings, of vthe capacityin
power> amplifier tubes which operate so -as to .55, circuit and'in other cases the amount of cou
Ín this way, proper' I
voltage will be applied Vto the grids of the ñnal
power amplifier tubes for different operating con
' the plate coil ILIB are equal.
pling or the amount of inductance in the power
I amplifier tank circuit.
In the drawings:
Figure 1 is a wiring diagram of a push-pull'
connected driver-amplifier stage feeding through Ul
a condenser-,divider arrangement the gridsrof a
pair of push-Ípullz'connected vac'uìumïtube amplii- A
` ñers of a high frequency power amplifier'. As il'-`
From the foregoing, it will be observed that
the input capacity of the powerv amplifier tubes ,
.Imi-„arid- I.V,Iû;forrn thev lówrvoltagef‘llegs of a`con-»V
de’rise‘r divider; Hence',`as'"`long a'sdil’ie= radio fre
lustrated in Figure 1, reversible electric motora Y quency plate voltage of the driverrstage' is held
constant, the condenser divider serves to main
are provided for varying neutralizing and tuning“
tain‘ja'A correspondingly constant excitation volt- Y
condensers, the inductance of the tankfcircuit,
age to the power amplifier across the power tubes ï
>IV9v andIV fiilâoverra very wide frequency range.
power amplifier and the final 'o
and the coupling between the tank dcircuituof? the
'_ By. virI-,ue'’o’ffth'ey condenser divider tuning, the
which the tank circuit is couplj
driver'outputVY ys'tag'c'ïcan beA adjusted over the en
Figure 2 is a side elevational "view
"i I of 1;;
. constituting the power amplifier stage yand Vout- v
Vput circuit of Figure 1;
tire frequeñ'c'y'raîige without affecting the ratio
of driver pl’ateftopower amplifier grid radio fre- Y
quency voltage. Actually some fixed adjustment
of ,theV coupling capacitors oftheïvoltage dividerV Y
paratus of Figure 2;
arrangement'may, be required." We have found `
, YFigure 4,15, a Sectional .View 0f .the apparatus
thatY the enti-'re'- range from -siïxto- twenty-two ' „
of AFigure> 2 >looking'"against plane 4*-4 'of Figure
Figure 3 is a front elevation al
view ofthe ap
niegacycles ¿can be covered withthree com-bina
L t
tions `rof the~>conde?sersj Vin Vthjefvoltage- divider
¿Figures ,5; 6", .'_Tjan'd- 8' are `detai‘le'c‘i Views of the
tarrlçY circuitY of , thej push-pull powerY amplifier _as
airaingedV for; Adiiï'erent` lfre‘c’gl'uen'cy ranges ‘of op
byïïme'aïns of the tapsf'on coilV III-TIE" andi'by‘ch'angf.
ing the position and :coupling of -a short-circuited
`läteferring Vto Figure i1,4 anyr carrier frequency
'within a'range of_,'s`ay, for examplegô to‘22 mega
cycles,îis'fe'd.intoitlfie>- primary coil'v I LI-I and 'thence
in'to thesecondary ILISQ'eXcitingthe control> grids `.
tubesI‘VfI and> IVSinjphas'e opposition. _The
carrier 'may be generatedrby any suitable vac'
the other 'in series with the’g'rid fof theothertube »
'Ivmjo'f the _power amprñer. Also,-Yy ïit'î will be`
‘ 'frequency mum pliersï y ’,'I-fhe‘second'aryj ILI3 ¿is
tuned byïthe _split 'statorgjcoiidenser ‘I_CkiII.. The
„ »a
' ' mpliiiedA> ’output
As indicatcdycaeîof "the iai-,ter is con- '
riected-ín series Vwith thel-'grìdo'f tube LV?) fand
uum ¿tube generator- followed> by amplifiers vand
maestrias-'chores 151450' 4and inscri and radio
4*of ` theidriverfstage vconsisting ' of ,
frequency 'by-passjconde'nser lciatrhaveiçbeen K
'ftiibe'se'IjY'lfand IVe-appears in the'tuned'output `
provided îinv tlfieïgïrid circuit of the- -power' arnpli-V ~ y
"circuit comprising'coil IL IB and condense'rs ¿I CI Il I -, '
C81 v'and fICÍI'G‘Bj ‘The condensers are I s fier‘îstaga V4The-grid circuit-'as describedlprovides
into-„the `circuit'las' needed, depending §40 «balanced gïrid “currents over t he- entire range `of Y,
regnen@ employed-f
. if
-IzVQ Yandfl‘fiïl‘îl'..k :'Also', vasi-will 'be describedmore
fully-'_h'ereinafter, theitankcircuitÍ of the power
amplifier’ comprises" the'V inductance> IL5‘I', tuning
^ ssing» corîî'dèn‘sersfICBll VVand* 1G85 are` -also
chéd into the ' circu" ¿but are‘switched zout
rcuitin the range ofïhigherf'requenci'es. That ‘
and lleida; f ~
after, ar’eprovided. for the power amplifier. Itubes
o; ground bylo‘or'rdensers I-CliGÍ' and ECH . 'l
‘ "range-'lof lower frequencies,additionaliby- ‘Y
which will 'be describedin greater detail >l-iereiîn-n .
ds _of the" Idriver Y tubes j'IVïiar'id »Y I VE!u are `
' V
- , "
der to ¿prevent `spurious osc'zillations,` the
condenser I CI I 2'; short-circuitin'gl strap.‘SB, con- Y
.-byepassíng condenser ICI'Zß-’and
condensers I-Câj'l~ , and ICdâjwill -serve
` `
toiïgiye sufficient ley-passing ?tofground jat the »;
’ p ¿higher frequencies si-_ncefthese condensersjmay
be; described ‘moreifully : hereinafter; comprises _
' Athe inductor-¿11152,` -tuningcondenser'‘ICI I4 and
l î »'Over the' 'entire range ¿of frequencies, Y however, i
neutif'a-lizingfcònd'ensers` V>I-CtiS and ICES', which
fixed ' con'de'nse'ers` 'IC-I I 5' tot IC I 22a inclusive'.`
, ' Motori-driven; adjustment or tuning» ofr various
'the-Aanodes; Yare also> employed.' |Iïhat is, these
'elements :in ¿the power amplifier :stage ¿and out:`
put circuit »are provided;- Thus; 'greversiblez elec
‘neutraliïz‘ing'fcondensers» are ernploye'din'V addi
tiönlto thesereen grids andï'their by-passing cir
IGI-0B and’ICrl‘ßf'l’. ¿ Directiong’of-g'rotation is conf
î'ofJf-re‘que'ncies. . ' The-use of «such» vncutralizing cir-
gramatically iíndiçátédf et' *,ILSÍI 2': and LS1! 3;, limit fr' 'Y
' may-consist ofï sectionsl of ¿copper strapadjacent
trifc` motor‘j lAgûçdrives,_neutralizing condensers , .i Y
c‘i-iitsVv toi' ground.- over! thev entire _operating-_range 60 trolled byV switchY I-SÍ'I. Ä Limiting-»switches dia
the amount of-,rotationgo-ffthe-motor in either .
' cuits i'n‘additionlto'the screening circuits ‘insures
freedom 'zfírcr'nf ï's‘p‘u’riou‘s ' voscillations.4 and similar `
65 'is 'ineffeci la voitmeter, inegccitage Jor
:Coupling ' fròriiï'tiie
` driver
~ ~»stage,
» ' tubes
>IN/"Iïa'ndïIlVIB, 'to the? final'po‘wer amplifier stage
corn‘prisin'gfwater' cooled- tubes `IV?!4 and ' IVIIL. is
-accomplish'ed.itloróugh` capacitors ICIIliJ, i648,
{C102} nI'C'ÍIî)3,\IC49-ari'd
t ì
de- '
Friençìslupon v,tlfleg position 0f’ tap .MB '11150111 pida
jtenti'oirieter ' IRIiS.> *The* tapjßIJB "is moved‘ along
the potentiometer I'R-43 Yby the `action of motor`
IAM. 1n# other v'vo-rdVs'-,V motor-'IAiZIlj> simultane- n
~ 'The cond'ensers ICI'IlIi7 ICM-and.4 I'C |02 are equal
sinlii'fa‘lue,` respectively, tocondensers ICII33,- i049,
~'and i I C’I 052 Y'I’hei Values'Vv of` the” upper-"three ca
‘Y so: niet tric?cciipiiiigëcap'acitiesfoni bein >si'd'eslof s115 fiiniiting- switch
ne missiles 111A;
IISISQISZIJ and ISAZ‘I, and indicators IMIS, IMIII,
'IMIS 'and- IMI'Il are provided for adjusting and
indicating the' adjustmentI »of `Ícondensers » ICI I2,
coupling between inductors IL5I-'an'd IL52-and
condenser ICI | 4. -Supply voltage for the`> tuning
indicating system is derived' from the rectifier
arrangement IASB. Motor driving power is fur
nished through leadsì'IB and 2A.
The power
supply to these leads may be, for example, 220
volts 60. cycles A. C. current.
The limit switches, such as" ISIZ and ISI3,
may'. be operated by cams, in turn operated or
driven by reduction gearing coupled to the motor
laxially along and fastened in aï?ydesired posi
tion with respect to the vacuum tubes V9 and
:VIII and, of course, with respect to the movable
The tank circuit
' of Figure
. ».
'isî'alsoillustrated in Figures 2 and 3. This con'
denser, as illustratedin the latter. figures,- in'
cludes the edge rounded, substantially >rectangu
lar- plates 46 and 4'|. Plate 46 is independently
adjustable with reference to the movable plate
35 and also with respect to tube V9 by means of
hinge 49, and theslotted bracket and wing nut
construction 54. By a similar arrangement of
IA20, so that after a given number‘of revolu
parts condenser plate 41 is made independently
tions in one direction, »limit switch ISI2 will be 15 adjustable with reference to movable plate 35 and
opened and after a given number of revolutions
vacuum tube VID.
in the other direction limit switch ISI3 will be
. Plate 35 is adjusted by rotation of'motor |A23
opened. Similarly, the potentiometer and tap
through gear reduction mechanism within the
arrangement |R43 and 40B may be controlled
`motor casing and bracket cam and slotted ap
by reduction gearing also coupled to the motor 20 paratus. The cam and slot apparatus is shown
IA29, the tap being in contact with and moved
more clearly in Figure 2 at‘36 and 31.
» ,
)Over a circularly. shaped potentiometer, Similar
Cooling water is fed to the anodes of the vac
comments arev applicable to the other limit
uum tubes through the insulating coils 24, 25
switches and potentiometers controlling the tun
which provide for direct current insulation from
ing indicators T|, The latter are provided with 25 ground. The cooling water is also fed and re
by-passing condensers |C`|5 to |C'|9 inclusive.
moved through the straight sections of insulat
A preferred electrical and mechanical arrange
ing pipe 20 and 2|. AThe latter offer high im
ment of the various parts of the power ampli
pedanceto and effectively insulate the tube plates
fier system and output circuit are shown in Fig
from ground for radio frequency currents.
-ures 2 to 8 inclusive. One vfeature of the arrange 30
As shown in Figures 2, 4, and 8 the induc
ment consists in an assembly wherein the cou
tive portion |L5I of the tunable tank circuit of
pling of the output circuits comprising IL52 with
Figure 1 consists of metallic tubing 339, 34D and
the preceding circuit comprising |L5I may be
34|. This tubing 339, 349 and 34| is removably
varied without varying the tuningY of the output
`ñxed vto the anodes by means of the wing nut
circuit and wherein the tuning of the output cir
operated flanges 5|.
cuit may be varied without changes in coupling.
As brieflystated before, Figure 2 is a side ele
for certain frequency ranges portionsof the ver
vational, view 0f the'power ampliñer assembly
tically movable inductors 325, 325A of `Figures 2
comprising tubes |V9 and IVI 9; Figure 3v is a
front elevational View of Figure: 2; Figure 4 is 40 and 4. This movable inductor portion 325, 325A
is supported by stand-01T insulators |46 upon an
a sectional view of Figure 2; and Figures 5, 6, '7
edge-rounded rectangular metallic` plate 32|
and 8 illustrate arrangements and'adjustments
which is fed with plate voltage through conduc
for the power amplifiel` tank circuit comprising
tive strap v|83”(Fig. 2). Metal plate 32| in turn
IL5| for different frequency ranges.
supported from a grounded metal
‘Turning to Figure 3, radio frequency excita
lic plate 3I5 by means of additional stand-off
tion from the driver stage is fed to the grids of
the power ampliñer tubes IV9 and IVIO at the
Grounded plate 3I5 has attached >thereto
grid> input terminals 33, 83 and 33', 83’. Two
threaded spindles` 3|9 cooperating with inter
`leads, to each grid are provi-ded which are con
nally threaded sprockets 3| 3, in turn supported
nected together and to external circuits at 54
by grounded metallic pedestals 3H). Motor I AZI
suitable gear reducing `mechanism within
The neutralizing condensers ICIG'I and I CIIJB
the motor casing and the latter through bevel
of. Figure 1 are illustrated in Figures 2 and 3 and
gear mechanism BGM and sprocket S drives chain
`are seen. to comprise rounded or rectangular
326. Chain 326 causes simultaneous operation of
plates 56 directly attached to the tube anodes
all ofthe sprockets 3| 3, resulting in movement
by means of brackets 56A and 56B. The vari
of the entire assembly upwardly or downwardly.
able plates of the neutralizing condensers are
This assembly includes'ground plate 3I5, anode
plates 59, 6|) each of which is of U-shape, so as
or “B” voltage plate 32|, and the apparatus
to partially surround each of tubes V9 and VID.
These U-shaped plates 59, 60, fixed together by 60 supported by rectangular plate 32| which appa
ratus includes inductor 325, condenser I C|23 and
insulating strip 59A, are simultaneously rotated
on hinges 64, 64A by the operation of the motor
IA2IJ. This follows since rotation of motor IA20
is translated into movement of condenser plates
59 and 6U by means of drum DI, cable 91 and
vinsulating supporting anchors 63, 63A appropri
choke coil IL56. The direction of rotationof
motor IA2| and, hence, the direction of move
ment of the assembly depends upon the position
to which switch ISB of Figure 1 is thrown. Move
ment of the assembly changes the inductance
between the bottom turn 325, 325A and the upper
turn 33,9, 340 which is fixed in position and
ately attached to the plate 59, 60.
Individual adjustment of the neutralizing con
clamped as illustrated at 5| to the anodes of
densers may be made by adjustment of the wing
nuts (not shown) at points 54”, whereby the 70 vacuum tubes V9 and VID. In this way, .the
total tank inductance is changed, decreasing as
condenser plates 56 may each be independently
the assembly is lowered and increasing as it is
adjusted with respect to the simultaneously
raised and the turns 339,` 340 and 325, 325A
moved condenser plates 59, 60, This can be
brought closer together. This change in induc
done since the brackets 56A and 56B are slotted
tance gives one control on the tuning on the tank
s'o-that the”. condenser plates 56 may be moved
circuitcomprising IL5I of Figure 1. «Another
,8 »n
lcont-rol 'on prad-»justmentbf ¿this ,tuning haslal- y
Vready íbeen mentioned. namely, .adjustment „of
and reversiblemotor 1|A23.
, ,
.Abetter‘unde'rstan'ding -of .the manner in which
the plate tank vcircuit'fincluctance',may ¿be :varied
Vmay be shad by referringrto Figures 5,‘6, 7 ‘and v8,
¿which :diagrammatically .illustrate connections
VAand adjustments .forvvarious frequency bands. i Y.
¿For example, Figure g5 illustrates lthe .connec- `
; ¿tions ¿and adjustments of fthe inductive portion
‘ YlfL5| :ofthe ¿power Yamplifier plate circuit of j‘Fig
lure :1 for 'operation iny a frequency :range ,run-`
pning rapproximately from .16,0 to 9.8 'megacycles`
.Aszshown'in Figureä, ,the upper tank conductors l115
339, 34D are fixed in position ,and-_connected at
itheirright handterminals, as indicated diagram-`
».matically, to the anodes of tubes lVS vand 5|V|0.
- They are insulatingly supported '_by :the insulating
„supports 51,5113, ,as also illustrated in Figure _4.
Also, as shownin Figure 5,.the plate 32|, corre
sponding `to plate 32| of Figure '2,.supports the
stand-oil insulators |156, inductors 325, 325A, con
.denser 1C |`23,'and choke Vcoil .|L56. Choke lcoil
m55-and condenser ICI23 >are movable within
»the guide 323 along the plate 32| and in rthis
lWay can have one of their terminals connected
.the iarraneementcis ,shown asillustratedin'. Figure Y
58,. . In that case, fthe ,lower inductors ¿325 ¿and
,'32 5A .are L¿disconnectedzffmrn :circuitand the-upper
rinductol'. system previously. used is _replaced-.Joy
Iinductors' 34| having a `'l?lfrger lconductor :dia-m.
veter than lthe rpreviously vemployed pipes ,or tubes
vlìieferring to_ Figure V2,1it -Will’be Y'found
.condenser plate arrangement 3|5,- 32| ,improves
stability and tends to »lessen :the setting21110.y `.0f
parasitic oscillations.
Ther _plate voltage ïlead .
|83 ¿isfggrounded for radio1frequencycurrentsfby
means Yof .the condenser ¿iQ-|24, as, illustrated
.more clearly in >li‘iguire 22.
, The inductance Vlof .the output'circuìt §|L52 vof
,Figure «1 consistsof a portion of the :hairpin in-v '
ïductor L52 orLLEZA ofFiguresfél .and'2. h.The coil
¿of the larger conductor size L52Aiis employed-for
the `higher ¿frequency range _fsuclfry as, vfor example,
from 15_ to `22 inc. :The hairpinsL-52 and _=L52A
which may, ,for example,- consist respectively lof
one inch ìand two-inchcopper pipe, are's’electively
connected into circuit by ¿the iiexible connecting
straps S382.V As shown, L52 visconnectedfintocir.
Cuit. 'Iîheiiixed condenser tanks. |C||5 '.tof|;Cf|.22 K
inclusive of Figure 1 are similarly illustrated ¿in `
Figures 2 and 4.
The variabley plates of :condenser
-to vthe adjustable short circuiting bar SB. The
Figure lare illustrated in _Figure 4 at«'§3’|ß ‘and
inductance ‘|L5I of Figure 1, as illustrated in
310A, each consisting'of .a substantially rectan-`
Figure .5, consequently maybe traced from the -30 .gular
metallic plate having rounded Vcorners'.-and
'plateoftube ‘IV9 through conductor 339,.the right
rounded Ledges. AThese’movable condenser plates
"hand flexible connector '34B tothe right along
Vare provided with ,metallic ¿dishpan vsupports :i314
.conductor 325A, across vmetal bar SB electrically
in turn supporting `stand-off :insulators SBS-.exi
connected to and slidable along conductors 325
tending through-¿rounded .off perforations through 35
and 325A, then along inductor .325 to the left,
vthe movable plates'. 310 and 313A'. ¿In .this v.v'vay
'throughrthe left .hand lflexible strap 355 and then
electric stress on _the ,stand-oiîßzinsulators' isïre->
v‘along conductor34n 'to the plate of tube IVM).
duced rWhile at :the same :time permitting >the
iThe'upperplateSSt of condenser|C|23 of Fig
,movable plates 370' and 310A rto beibrought closer
‘ures v2r and l5 is connected Íby strap 387 to the
to-thegroundedplate.358. "Rectangulargrounded
shortcircuitingbar SB. ‘The .choke ILES is ,con-` 40 'plate 358 .extends across vand is thereby »capaci
:nected to the short circuiting bar SB ‘by «strap
-tively coupled to both Vof themovabletplates .'311'0
333 =of"-Figures 2 and ‘5. The lower plate of con-y
and 310A; '.Thisais clearfrom an A,inspection of
denser |C|23 rests upon vand .is thereby directly
Figure 4.
vvconnected to'plate 32|. The capacity‘ofßlCl2'3
Referring again to Figure 2,.by means` of :motor
Ímay be adjusted by moving ¿the Wing -nuty and
.|,A25anditsreducing gearing driving the sprocket
pole arrangement supportingthe uppercondenser
SPI, v.chain V325A and the remainingtsprockets
SP2, SP3, SP4, ,SP5 ,and SP5, fthe latter three.
' As shown “inlFigure 5, the lnductance of the Y
tank circuit of 'the power amplifier stage con
being 'directly behind ¿SPL SP2;` and-SP3, con
denser. plates3ï|5 andiSTBA areïadjustedina ver
lsists effectively of two turna-in which the bottom 50 tical direction. The sprockets are supported- upon
'turn 325, '325A is moved relative tothe fixed >top
turn 339, r3150, >This inductive system yhas beenl '
,the pedestals V365which >in `turnÈare fastened to
the condenser Y'plate ‘353. J'The lsprockets are. in- .
'found :useful 'for 'the range :of frequencies run
lternally threadedzand ¿the 'threads thereof fen
ning 'from 6.0 to approximately 9í8 megacycles.
gage .the v'threads on 'the spindles .361, 368,:and
Obviously, for various frequencies within this
368A it-hereby .causing .movement 'of' vthe .movable
range'the Vposition ofthe 'short circuiting bar on
.plates ‘33.0 and 31 ûA With-'respect tothe common
theinductors 325, -325A'is changed and the sepa
condenser> .plate :358 inla `direction perpendicular
’lration of the turns 339, 3,40 and 1325, 325A'may
to the.planesoftlie.condenser plates. Fromwhat '
vbe adjusted asbeforedescribed.ì
has been said'it should .beclearfth'at the spindle,
For Vthe frequency range runninggfrom 9.8 Á.to 60
sprocket ~and¢motor mechanism .|A25, SPI, i368,
10.5 megacycles, the `general arrangement of «the
etc., is similar to ‘thespindle chain and sprocket
"parts and adjustments _are 'illustrated *in Figure
driving ymechanism Adescribed for .moving theV
`6. vFor this 'range the :snorting Vbar SB is moved . plates '315, 4325| »and the «apparatus -supported
-to the .extreme left ‘hand’ end of the lower in
/ductors 325, 3125A.
» '
In a Asimilar Way motor .IAM- .operatesythe
For a frequency lrange of Vfrom ~l0;-5 to 13.8
sprocket, chain .and .spindle ‘mechanism 313B,
megacycles, the lower inductance »bars »are »not
used at ?all, the straps 345 inthat ,eventbeing 321B, 353B, 353B andßäliA .whereby .the-.entire
. assembly of i-riductor` unitV |1352 and 'condenser
connected, as illustrated 2in Figuref'ï, to only the
[A is moved -in'ra vertical'zdirection; "Hence,
lupperV 'inductors 339, 3153 Yand "to 'the condenser 70 -|C|
operation »of motorl .m25„controls‘theituning Iof '
‘|Cl23. ‘The `choke m55 -in this -casehas :one fof
the .output .circuit .independently of '- the ¿coupling
"its terminals connected through strap .333 'to the
`to the tankcircuit, and operation ¿of gmotorflAZll .
'snorting' bar.SB, as shown,` .For still'higl'íer'fre
f‘quenci'es, namely, v*for example, for arrange of
Lfrequencies running "from 113.8 fto .222 \mega'cycles,
lmaybe usedtoïcontrol the ¿coupling of themat
-îput ~ circuit .tothe ,platecircuitofg the power fampli
ñer without altering the tuning of ythev output cir
cuit vcomprising I_CII4. It is to 'be noted- that
movement'oi the output assembly also includes
condenser ICI I5 up to and including ICI22.
The output from the output circuit is taken
through flexible conducting straps 38| and 38IA
to suitable terminals supported upon insulators
385. From the latter terminal a conductive strap
CS3‘ brings the amplified high frequency waves to
suitable insulatingly supported output terminals
35| and 35IA as shown in both Figures 2 and 4.
‘ As explained in lconnection with Figure l, the
various electric motorsare mechanically coupled
by reduction gearing and other mechanical in
strumentalities to change tuning of condensers,
coupling, etc. "Also,v additional _gearing is pro
vided whereby each motor mechanically drives the
movable armof a potentiometer which may be
arranged in the form-of acircle. For example,
' 3. In a high .frequency system,- a-p’air of ïvac-ï
uum tubes each having an an'od'e,- a pair -of linear
conductors connected to said anodes, said'anodes
and ‘linear conductors being supported in rela'
tively fixed position, a second-pair of linear ncon'
ductors arranged paralleltofsaid> `first pair, fiie'x
ible` connections between said conductors'fïsaidï
second pair of linear conductors being 'insulat
inglyv supported upon a 'substantially rectangular;
metallic plate,l a 'short-circuiting. bar ‘movablel
along and electrically connected to said-pair of
insulatingly supported conductors, a'lco?denser.
connecting said short-circuiting bar toi-said me
tallic plate, a radio- frequency choke coil connect
ing said metallic‘b'ar to said plate, a source’ of
direct current voltage connected-to said‘plate'
whereby- direct current voltage 4is `fed` fromusaid
source to said plate and through said chokecoil‘,
short-circuiting y~bar, linear conductors,` -andthe
as shown in Figurel, motor IA2I drives rheostat 20 flexible connections -therefor to` said anode'syand’l
arm 4IB of potentiometer IR44. The potentiom
a lay-passing condenser'connected between said
eter arrangement is illustrated somewhat sche
metallic plate and ground for maintaining said
matically to the left of motor IA2I in Figure 2
plate at substantially ground radio frequency
at point IRM. Similarly, for example, the po
tentiometer associated with motor IA24 is illus
4. Apparatus as claimed in claim 3, charac
trated at IR45 in the upper part of Figure 2 and
terized by the provision of mechanical apparatus
the potentiometer associated with electric motor
driven by a reversible electrical motor for mov
IA25 is illustrated at I R41, also in Figure 2.
ing said plate and the conductors insulatingly
Other parts of the apparatus illustrated in Fig
supported thereon closer to and further away
ures 2, 3 and 4 should be self-evident to those 30 from said conductors which are relatively fixed
skilled in the art, for example, the steel frame
in position, whereby the inductance of the cir
work of the ‘system and filament transformers
cuit connected between said anodes may be varied.
T26 and T2l, blower motor AIB (Fig. 3-top),
5. In combination, a U shaped inductor, means
filament by-passing condensers ICI |18, ICI $9, etc.,
for feeding high frequency energy thereto, a sec
and ICI 25 of Figure 1. Also, it is to be noted that 35 ond U shaped inductor arranged parallel to the
the grid chokes IL50 and IL59A of Figure 1 are
first, an output circuit connected to said second
illustrated in Figure 3, as is also condenser ICI3I).
U shaped inductor, said second U shaped inductor
The stand-01T insulators with corona shields 9
being arranged so that the plane of its conductors
for the tube sockets I0 and II are illustrated at
is substantially parallel `to the plane of the con
8 in Figure 2.
40 ductors of the first mentioned inductor, and me
Having thus described our invention, what we
chanical apparatus under` the control of a re
claim is:
versible electrical motor for producing relative
l. A variable inductor arrangement comprising
movement of said inductors in a direction per
a pair of conductors mounted in relatively fixed
pendicular tothe planes of the conductors of said
position, another pair of conductors insulatingly ~ inductors.
mounted upon a metal plate, connections con
necting said conductors serially` together, and ap
6. High frequency apparatus comprising a
looped conductor forming an inductance and a
paratus for moving said plate and said insulat
high frequency circuit coupled thereto, said cir
ingly supported conductors with respect to said
cuit comprising another looped conductor form
fixed conductors whereby the inductance of the 50 ing an inductance, and a plurality of condensers
serially connected arrangement may be varied.
electrically connected thereto, apparatus for ad
2. High frequency apparatus comprising a me
justing the inductive coupling of said loops with
tallic plate, a ,pair of substantially linear con
out substantially affecting the tuning of said
ductors insulatingly supported upon said plate,
circuit, and apparatus for adjusting the tuning
an adjustable short-circuiting bar connected 55 of said circuit without substantially airecting the
across said conductors, a condenser having one
coupling between said looped conductors.
terminal connected to said short-circuiting bar
’7. High frequency apparatus comprising a first
and another terminal to said plate, a high fre
looped conductor forming a first inductance, a
quency choke having one terminal connected
second looped conductor forming a second in
to said bar and its other terminal to said plate, 60 ductance and arranged substantially parallel to
said choke and condenser being movable along
the first, a grounded metallic plate of substantial
said plate as said short-circuiting bar is moved
ly rectangular shape upon which said second
along said conductors, a circuit for maintaining
looped conductor is insulatingly mounted, a pair
said plate at positive potential with respect to
of condenser plates connected to opposite sides
ground, a by-passing condenser connected be 65 of said second mentioned conductor loop and be
tween said plate and ground for maintaining
ing adjustably supported between said loop and
said plate at ground radio frequency potential,
said metallic plate, means for moving said oppo- „
another pair of substantially linear conductors
sitely >connected condenser plates physically with
arranged substantially parallel to said insulat
reference to said grounded condenser plate, and
ingly supported linear conductors, connections 70 means for moving said ground plate, movable
I for serially connecting together all of said con
ductors, and apparatus for moving said plate
plates and second conductor loop as a unit with
respect to said iirst mentioned conductor loop.
8. Apparatus as claimed in claim '7, character
ized by the fact that said movable condenser
with respect to said fixed conductors in order to
effectively vary the inductance of 'said serially
connected conductors.
75 plates are moved by means of mechanical appa
ratus under control of a reversible electrical mo
tor- and that similarly the apparatus is moved as
ahunit under control`r of »other mechanical appa
ratus in turn under control of another reversi
ble electrical motor.
9. High frequency apparatus comprising a
grounded movable substantially «rect-angular
metal plate having'openings therein, insulators
extending through and movably supported upon
said plate, a pair offmov-able condenser plates
supported by said' insulators, apparatus for caus
ingsaidî movable platesto move in unison towards
or away from said grounded plate, a U shaped
conductor'„arrangement insulatingly supported
coil. insulatingly supported uponsaid plate; a di*`
recti` current circuit' connectedftc said _plate 'for
maintaining said plate at ahigh direct current
voltage with respect to ground, means' connecting
one terminal of said choke to said pla-te'land its
.other .terminal to high frequency apparatusgça>
condenser having one terminal connected to ,
ground, and'means for connectingîthe'vother ter
min-al of said condenser to said'plate fori’niain'a
taining the latter at ground radiov frequencyfpœ
11. ApparatusI as , claimed
l. in claim 10 charac
_ or
terized by the fact that said metallic plate'is sup»
ported by stand-off insulators» upon a second_me
moon- said rectangular grounded metal plate», said> 15 -tallic plate arrangedsubstantially parallel to said
ñrst mentioned plateywsaid I second mentioned
movable ’plates Vbeîngrmounted' between said ine
' ciuctorfandv said grounded plate `and being con'
nectedfto opposite sides of said inductor. v
: 10. High frequency apparatus comprising an
extensive metallic plate, a high frequency choke 20
platebeing electrically‘connected to ground: y
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