US1434985A

US1434985A - Radioreceiving system

Info

Publication number: US1434985A
Application number: US466476A
Authority: US
Inventors: Harold H Beverage
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1921-05-03
Filing date: 1921-05-03
Publication date: 1922-11-07
Anticipated expiration: 1939-11-07

Description

H. H. BEVERAGE.

' mmoazcuvms SYSTEM.

APPLICATION "LED 73.1921.

. Patented Nov. 7, 1922. I j l. 2 SHEETS-(SHEET 1-.

. Ihven't o rz Harold H Beverage.

- His Attorney.

H. H. BEVERAGE.

RADIORECEIVING SYSTEM.

APPLICATION men MAY 3, I921.

v Patented Nov. 7, 1922. Fig.5 2 SHEETS-Q-SEiEE] Z.

. Ha Id H. Beyer 839,", w

Patented Nov. 7, 1922.

UNITED STATES PATENT OFFICE.

HAROLD H. BEVERAGE, 0F RIV ERHEAD, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

BADIORECEIVING SYSTEM.

Application filed my a, 1921. Serial No. 468,478.

To all whom it may concern.

Be it known that I, HAROLD H. Bnvnnacn, a..'citizen of the United States, residing at Riverhead, in the county of Suffolk, State of New York. have invented certain new and useful Improvements in Radioreceivingsystoms, of which the following is a spclfication.

My present invention relates to radio receiving system, and more particularly to a system which permits of the simultaneous reception of a plurality of slgnals at a single receiving station.

In-my prior application, Serial No. 372,- 933, filed April 10,1920, issued June 7, 1921 as Patent No. 1,381,089, I have described and claimed a form of horizontal receiving antenna which is especially adapted for the efficient reception of signals. I

The object of my present invention is to provide a method of and means for utilizing an antenna of the form described in my prior application for the simultaneous reception of a plurality of signals of different wave lengths. I have pointed out in the above mentioned application that with a long receiving antenna extending in the general direction of transmission of-nthe signaling waves to be received signaling currents produced in the antenna by wavescoming from any particular transmitting sta-' tion will be strongest at the end of the antenna farthest from,the transmitting/stat tion, while current produced by waves com? ing from the opposite direction will be a minimum at that point. The antenna described is referably aperiodic so that the strength of the signaling currents produced therein is substantially independent of the wave length.

In carryin out myinvention, I utilize an antenna of t is type and inip'ressfrom the antenna upon a plurality of receiving circuits which are resona'nt'to thefrequencies of the different signalingwaves to be received, currents produced in the antenna at a selected point. Each receiving circuit selects the particular signaling wave which it is desired to receive in that circuit with-i out interfering with the selection of the desired ,Waves by any of the, other j-receiving circuits. In order toimprove the reception; I also provide means for impressing upon each receiving circuit-a currentfselected from another point in the antenna. which will be of the proper intensity and phase to neutrahze in each receiving circuit disturbing currents produced therein either by interference from undesired waves or by strays The novel features which I believe to be characteristic of my invention are set forth 1n the appended claims. The invention itself, however, both as to its organization and method of operation, together with further objects and advantages thereof, will best be understood by reference to the follow1ng description taken inconnection with the accompanying drawings in which Fi s. 1 to 4, inclusive, show diagrammaticafly four different circuit arrangements whenby my invention may be carried into effect.

As indicated in the drawings, I provide a long horizontal receiving ahtenna made u wave, the current wave in the antenna will gradually build up and become a maximum at the end farthest from the transmitting station. I If the velocity of the current wave in the antenna difi'ers somewhat from that of the ether wave, then for a certain dis tance the waves will add but a point will finally be reached where one wave-will be so far in advance of the other that'the two will be in phase opposition. Interference will then occur-and the current wave will start to decrease' In any case, the antenna should preferably be constructed with such constants that the length at which the current wave becomes maximum will be at least as great as a half wavelength of the signaling wave to be received. Currents producedat the end 3 by ether waves traveling from that end to the end 4 will have substantially a zero value at the end 3 and will increase to a maximum-value at the end 4. In the same 7 way currents produced by ether waves trav- 100 cling from the end 4 toward the end .3 will have a minimum valueat the end 4 and a maximum value at the end 3. In order to reve'nt reflection of the current waves flowlng inthe antenna from the ends, the ground 105 connections may be made through resistances having a value substantiallye ual to the surge 1m edance of the antenna. n the 5 resent case, have indicated such a. --ground- 1ng resistance 5 at the end 4 of the antenna.- :10

- opposite A similar rounding resistance may be used at both an s of the antenna if desired.

In Figs. 1 and 2, I have indicated the receiving station as being located at the end 4 of the antenna. In order to be able to receive at this point currents produced by waves traveling from the end 4 toward the end 3 which consequently are a maximum at the end 3, the antenna conductors may be employed as a transmission line for trans= mitting signalin currents from the end 3 of *the antenna to t e receiving apparatus. In

order to accomplish this the currents 1n the antenna conductors flowing toward the end 3 are caused toflow .to ground through the primary winding 6 of a transformer, the secondary 7 of which hasits terminals connected to conductors 1 and 2 respectively. Asa result the signaling currents flowing to ground at 3 roduce currents flowing in directions in the conductors 1 and 2. In..-other words, the conductors 1 and 2 form the two sides of a transmission line which is completed in the arrangement shown in Fig. 1 by means of the two coils 8 and 9 of a goniometer located at the end 4 of the antenna. The point 10 between the two coils of the goniometer being connected of the signaling currents conveyed over the.

' as desired may be emplo ed.

' frequencies.

toground at 4 and the mid point of the secondary 7 being connected to ground at 3, substantially no current will be produced in the ground connection 4 by means transmission line. 4

Two secondary coils 11- and 12 which are associated with the goniometer coils 8 and 9 are included in two resonant receiving ci'r cuits which include

inductances

13 and 14 and tuning condensers 15 and 16. While fo'r simplicity I have indicated only two receiving circuits, as many receivingclrcuits The current reduce 1n. the receiving circuits may be mpressedupon the two sets' ofjreceiving apparatus 17 18, which maybe ofany desired form. The distributed inductance and capacity of the antenna do not .remain constant, but change more or less with frequency. This may be due to lesser depth of penetration into the earth at higher It may also happen that the antenna will be-partially unbalanced to signals and strays coming from the side except when'the antennalength bearsa definite relation to the wave "length. If; therefore, thereception of several signals is to be carried on simultaneously; and if these signals difier greatly in wave length, an ad-. justment of the dampingresistance 5 will render the antenna perfectly unidirectional for only the wave length for which the damping resistances is adjusted. While when properly adjusted the antenna has de- 'cided unidirectional properties, mathematical analysis indicates and experience shows it is possible to neutralize in the receiving that at the end farthest from the transmitconditions be roduced by waves coming" from the opposite direction even though the ground reslstance is properly adjusted to prevent reflection. For these reasons it is desirable in order to secure the best results to balance out in the receiving circuit undesired currents produced by these different factors. This balancing action is accomplished inthe arrangement shown in Fig. l by connecting in series with the ground connection at 4 the primary windings of two

intensity couplers

19 and 20, the secondary nection at 4 the primary windingsof two to phase

rotators

23 and 24 respectively, these hase rotators being included in the receiylng circuits. The currents flowing to ground at 4 are currents built upon the antenna conductors in parallel by the ether 35 waves traveling from the end 3 tow'ardthe end 4. By selecting currents from the ground connection at 4 and regulating the phase and intensity of the currents selected.

circuits the effect of substantially all currents produced therein by waves coming from a different direction from that of the desired signaling waves.

It will be noted that in the arrangement 95,

shown in Fig. 1 the

primaries

19 and 20 of the intensity couplers are connected m series with the damping resistance 5 thus making the damping circuitinductive. 'lhe inductive reactance can be neutralized by a series condenser for a sin le wave length,

but for other j wave len s the damping circuit will be reactive either capacitive or inductive, and the undesired currents which will be reflected from the end 4 of the antenna and impressedupon the receiving sets willbe greater than will be'the case if the damping circuit were pure resistance.

. In the' arrangement shown in Fig.2, this disadvantage is overcome by employing-unfit) electron discharge amplifier 25 having its input ci'rcuitconnected tothe resistance "

primaries

19, 20 of the in-- and having the included in the output cir tensity couplers cuit. Since the input circuit otthis amplifier is pure resistance the damping circuit is also a-pure resistance. In the arrangement .shown in Fig. 2 also the goniometer coils 8 and 9 are replaced by a single primary winding 26-vwhich iscoupled with the individual secondary windings 11 and 12.

The arrangement shown in Fig. 3 difiers from that shown in the preceding figures in that the receiving'sta tion is located at the end of the antenna farthest from the transmitt ,station. "The desired signalingicun rents,t erefore,-which'flow through the-con r ductors 1 and2 in parallel How to ground through the primary winding 27.. which is coupled to the individual secondaries 11 and preceding figures.

In Fig. 4 I have shown an arrangement of the apparatus whereby the receiving station may be located at a point between the ends of the antenna' In this case, the desired signaling currents which travel from the end 4 of the antenna toward the end 3 are fed back over theantenna as a transmission line to a point where the receiving statlon is located, and caused to flowthrough the primary winding 29 which is connected across the two antenna conductors at that point. The currents for neutralization purposes produced by waves traveling from the end 3 toward the end 4 of the antenna are caused to flow through the ground connection at 30, which is made to the mid point 31 of the winding 29. A high inductance choke coil 32 is included in this ground connection and the input circuit of the amplifier 25 is connected to the terminals of this choke coil. In other respects the operation-is the same as'the operation of the arrangement shown in the preceding figures.

While I have shown and described the preferred embodiments of my invention, it will be apparent that it is by no means limited to the particular circuit arrangements shown as many modifications in the arrangement of the circuits, the location of thereceiving apparatus, and the type of apparatus employed may be made without departing from the scope of my invention as set forth in the appendedclaims.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends. a plurality of resonant receiving circuits, means for impressing desired signaling currents produced in said antenna. at one point upon saidreceiving circuits. and means for impressing upon said receiving circuits un desired currents produced in said antenna" at another point; 2. A receiving system, for radio signals comprising an. aperiodic horizontal-receiving antenna which is grounded at both ends, a'plurality' of resonant receiving circuits.

. and means for impressing upon each of said receiving circuits currents produced in said antenna at two. d fferent polnts.

3. A receivmg system .for radio slgnals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonantreceiving circuits, located at a point along the length of said antenna, means for impressing upon said receiving circuits currents produced in said antenna at the point where the'receiving circuits are located and means for impressing upon said receiving circuits currents produced in said antenna at a different point along its length 4. receiving system for radio signals oomprlslng an a eriodic horizontal receivmg antenna whlc is grounded at both ends, a plurality of resonant receiving circuits, lo cate at a point along the length of said .antenna, means for impressing upon said receiving circuits currents produced in said antenna a't the point where the receivin circuits are located and means for uti izing said antenna as a transmission line for transmitting to said receiving circuits currents produced in said antenna at a different point along its length. i

A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits located at a point along the length of said antenna, means for impressing upon said receiving circuits desired signaling currents produced in saidantenna at a distant point and means i for impressing upon said receiving circuits undesired currents produced in said antenna at the point where the receiving circuits are located.

'6. A- receiving system for radio signals comprising an aperiodic horizontal receiving antenna whic is grounded at both ends, a plurality of resonant receiving circuits 10'- cated at apoint along the length of said antenna, means for utilizing said'antenna as a transmission line for transmitting to said receiving circuits desired signaling. currents produced in said antenna at a'distant point, and means for impressing upon said receiving-circuits undesired currents produced in said antenna at the point where the receiving circuits are located.

receiving system for radio signals comprising an aperiodic horizontal receiv-' ing antenna which is grounded at both ends, a plurality of resonant receiving circuits located at one end of said antenna and means for impressing upon-said receiving circuits cur ents Produced in saidantennafat the end-where the receiving circuits are located)" and at a distant point along the length'd" the antenna.

8. A receiving system for radio:sigma comprising an aperiodic horizontal-{remix ing antenna which is grounded at botlirends,

a'pluralityof resonant receiving circuits 10 A at the end where the receiving circuits are located, and desired signaling currents producedin said antenna at a distant point along the length of the antenna.

' as a transmission line for transmitting to the receivin circuits desired signaling currents produce in said antenna at a distant point along the length of the antenna.

10. A receiving system for radio signals comprising an a riodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits, means for irn ressing desired signaling currents receive ,upon said antenna upon each of said receiving circuits and means for impressing upon each of said receiving circuits currents derived from said antenna and of suitable hase and intensity to neutralize therein t e eifect of undesired currents received upon said antenna.

11. A receiving systemfor radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits, means for im ressing upon said receiving circuits desire signaling currents produced in said antenna at one point and means for impressing upon said receiving circuits-currents produced in said antenna at another point and of suitable phase and intensity to neutralize in the receiving circuits the eife'ct of undesired currents received upon said antenna.

12. A' receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits located at a point along the length of the antenna, means for impressing upon said receiving circuits-desired signaling currents produced in said antennaat a distant point and means for lmpressing upon sald rece1vmg circuits currents produced inlthe, antenna at the point where the recelving clrcuits are located and of suitable phase and intensity-to neutralize in the receiving circuits the efiect of undesired currentsreceived upon said antenna.

" 13,. A receiving system for radio signals- ..comp' rising' an a riodic horizontal receiving antenna whic is grounded at both ends,

a plurality of resonant receiving circuits 1o cated at one end of the antenna, means for impressing upon said receivin circuits desiredflsi'gnalin currents pro need in said antenna at a. ant point, and means for impressin upon said receiving circuits currents pro uced'in the antenna at the end-' where the receiving circuits are located and of suitable hase and intensity to neutralize 'in the receiving circuits the efl'ect of undesired currents received upon said antenna.

14. A receiving system for radio signals comprising an a eriodic horizontal receiving antenna whic is grounded at both ends, a plurality of resonant receiving circuits located at one end of the antenna, means for utilizing said antenna as a transmission line for transmitting to said receiving circuits desired signaling currents produced in said antenna ata distant point, and means for impressin upon said receiving circuits currents pro need .in the antenna at the end where the receiving circuits are located and of suitable phase and intensity to neutralize in the receiving circuits the effect of undesired currents received upon said antenna. 15. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits, and means for impressing upon each of the receiving circuits currents produced in both of the ground connections.

16. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a

plurality of resonant receiving circuits, means for impressing upon each of the receiving circuits currents produced in the ground connection at one end and mea as for utilizing said antenna as a transmission line for transmitting to'each of the recelving circuits currents:

produced in the antenna at a point remote from said ground'connec'tion.

18. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends,

a plurality or resonant receiving circuits,-

means for impressing upon each of the. receivin 1 ground conneetion'at one end and means for. impressing upon each of the receiving cirsity derived from the ground connection at the op osite end. 4

19. receiving system for radio signals comprising sin-aperiodic horizontal receiving antenna which 1s grounded at both ends, a pluralit ofresonant receiving circuits, means or utilizing said antenna as a tr'an's circults currents produced in the cuits currents of adjusted phase and inten- I said antenna.

mission line for transmitting to each of the receiving circuits currents produced in the ground connection at one end and means for impressing upon each of the receiving circuits producedin the ground connection at the op osite end.

20. receiving system for radio signals comprising ana eriodic horizontal receiving antenna whic is grounded at both ends, a plurality of resonant receiving circuits, means for impressing upon each of said receiving circuits desired signaling currents produced in one of said ground connections, and means for impressing upon each of said receiving circuits currents produced in the other ground connections and of suitable phase and intensity to neutralize therein the effect of undesired currents received upon 21. Areceiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at-both ends,

a plurality of resonant receiving circuits,

means for utilizing said antenna as a transmission line for transmitting to each of said receiving circuits desired signaling currents produced .;in one of said ground connections, and means. for impressing upon each of said receiving circuits currents produced in the other 'ground connection androf suitable phase and intensity to neutralize therein the efiect of undesired currents received upon said antenna.

22. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends,

a plurality of resonant receiving circuits, a primary winding associated with said antenna in which desired signaling currents produced'at one point in said antenna are caused to flow, a plurality of secondary windings coupled to said primary winding and associated with the respective receiving circuits, and means for impressing upon each of said receiving circuits undesired currents produced in said antenna at another point.

23. A receiving system for-radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality-of resonant receiving circuits, a

a primary winding'associated with said'antenna in which desired signaling currents produced at onepoint in said antennajare caused to flow, a plurality of secondary windings cou led to said primary winding and-associate with the respectiverecei'ving circuits, and an individual primary and sec 'ondaryvwinding for impressing upon each of said receiving circuits undesired currents produced in said antenna at another point.

24. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna whic is grounded at both ends,

a plurality of resonant receiving. circuits, 'a'

primary winding in which desiredsignaling circuits desire signa currents produced in the ground connection at one end of said antenna are caused to flow, a plurality of secondary windings coupled to said primary winding and associated with the respective, receiving circuits, and means for impressing upon each of said receiving circuits undesired currents produced -in the ground connection at the other end of said antenna.

25. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits, a primary winding in which desired signaling currents roduced in the ground connection at one end of said antenna is caused to flow, a plurality of secondary windings coupled to said primary winding and associated with the respective receiving circuits, and an individual primary and secondary winding for impressing upon each of said receiving circuits undesired currents produced in the and associated with the respective receiving circuits, an individual primary and secondary winding forf impressing upon each of said receiving circuits undesired currents produced in said antenna at another point, and means for adjusting both the phase and intensity of the undesired currents thus iInpressed upon the receiving circuits.

27. A receiving system for radio signals comprising an aperiodic horizontal receiv ing antenna which is grounded at both ends. a plurality of resonant receiving circuits, a primary winding in which desired signal ing currents produced in the ground connection at one end of said antenna are caused to flow, a plurality of secondary windings coupled to said primary winding and associated with the respective receiving circuits, an individual primary "and secondary winding for impressing upon each of said receiving circuits undesired currents produced in the ground connection at the other end of said antenna, and means, for adjusting both the phase and intensity of the undesired currents thus impressed upon the receiving circuits. 28. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both'ends, a plurality of resonant 'receivlng circults, means for im ressing upon said receiving ing currents produced circuits desired sigma in said antenna at one point, an electron discharge device having an input circuit associated with said antenna at another point and'an output circuit having means associated therewith for impressin upon said receiving circuits currents of a esired phase and intensity.

29. A'receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends, a plurality of resonant receiving circuits, means for im ressing upon said receivin circuits desire signa ing currents produce-i in said antenna at one point, an electron discharge device having an input circuit associated with said antenna at another point and an output-circuit which includes a pluralityof primary windings, a secondary winding associated with each of said primary windings and means for impressing upon each of said receiving circuits from an individual seconda winding :1 current of a desired phase an intensity,

, 30. A'receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends.

a plurality of resonant receiving circuits.

means for impressin'gupon'said receiving 1 in one of the ground connections of said antenna, an electron discharge device having an input circuit upon which currents produced in the other ground connection may 'be impressed and an output circuit having'means associated therewlth for impressin -upon said receiving circuits currents o a desired phase and intensity.

31. A receiving system for radio signals comprising an a eriodi'o horizontal receiving antenna whic is grounded at both ends, a plurality of. resonant receiving circuits,

means for im ressin upon said receiving circuits desire signa ing currents produced .in one of the ground connections of said antenna, an electron discharge device .having an input circuit upon which currents produced in the other, ground connection may be im ressed and an output circuit which inclu es a'plurality of primary windings, a secondary winding-associated with each of said primary windings and means for impressing upon each of said receiving 1 circuits from an individual secondary Winding a current tensity.

of a desiredphase and in- 4 receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at at least two oints, a plurality of resonant receiving circuits, and means-for impressing upon each of said receiving circuits currents pro-.

duced in two different ground connections.

33. A receiving. system for radio signals comprising an aperiodic horizontal-receiving antenna which is grounded at at least ng currents produced mamas points, a plurality of resonant receiving circuits, means for utilizing said antenna as a transmission line for transmitting to each of sa d recelving circuits desired signaling currents produced in one of said ground connections, and means for impressing upon each of said receiving circuits undesired currents produced in another of said ground connections.

35. A receiving system for radio signals comprising an aperiodic orizontal recelving antenna WhlCh'lS grounded at at least two points, a plurality of resonant receiving circuits located at a point along the length of said antenna adjacent to one of said ground connections, means for impressing upon each'of said receiving circuits currents produced in the adjacent ground connection and in one other ground conenction.

36. A' receiving-system for radio signals comprising an aperiodic horizontal receiving antenna which .is grounded at at leastt'wo points, a plurality of resonant receiving circuits located at a point along the length of said antenna adjacent to one of said ground connections, means forimpressing upon each points, a plurality of resonant receivingcircuits located at apoint along the length of.

said antenna adjacent to-oneof said ground connections, means. for impressingupon'each of said receiving circuits desired slgnaling currents produced in a distant ground connection, and an electron discharge device having an v input circuit associated with the adjacent ground connection and an output circuit having means associated therewith for impressing upon each of said receiving circuits currents tensity.

38'. A receiving system "for radio signals comprising an aperiodic horizontal receiving antenna which isgrounded at at least two points, a plurality of resonant receivof a desired phase and in.-

ing circuits located at a' oint along the length of said antenna ad went to one of said ground connections, means for pressing upon each of said receiving circuits desired signaling currents produced in a distant ground connection, an electron discharge device havin an input circuit associated with the a jacent ground connection and an out-put circuit which includes a plurality of primary windin s, a secondary winding associated with eac of said primary windin s, and means for impressing upon each 0 said receiving circuits from an individual secondary winding :1 current of a desired base and intensity.

' 39. A receiving system for radio'signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends and which has distributed constants ofnsuch value that electric waves produced therein by desired signaling waves will be propagated alongits length at such a velocity that increments of current produced in the antenna at points along its length by desired signaling waves in the ether willadd to the current flowing therein through a distance which is at least equal to a half wave length of the desired signaling wave, and a plurality of receiving circults associated therewith which are resonant to the frequencies of a plurality of signaling waves which it is desired to receive.

40. A receiving system -for radio si als comprising an aperiodic horizontal receiving rality of signaling waves" which it isde;

sired to receive, means for impressing upon said receiving circuits deslred signaling currents produced m said antenna at one polnt and means for-impressing upon said receiving circuits currents produced in said antenna at another point and of suitable phase and intensity to neutralizein the receiving.

circuits the effect of undesired currents received upon said antenna 41. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends and which has distributed constants of such value that, electric waves producedtherein by desired signaling waves will be propagatedalong its length at such a velocity that increments of current produced in the antenna at points along its length by desired signaling waves in the ether will add to the current flowing therein through a distance which is at least equal to a half wave length of the desired signaling wave, a pluralit of receiving circuits associated therewith w ich are resonant to the frequencies of a lurality of signaling waves which'it is des1red to receive, and means for impressing upon each of the receivin circuits currents produced in both the of t e grou'nd connections.

42. A receiving system for radio signals comprising an aperiodic horizontal I'BCGIVlH antenna which is grounded at both ends and which has distributed constants of such value that electric waves produced therein by desired si naling waves Will'be, rop agated along its length at such a velocity that in-- crements of current produced in the antenna at points along its length by desired signaling waves in the ether willadd to the current flowing therein throu h a distance which is at least equal to a'hal wavelength of the desired signaling wave, a. pluralit of receiving circuits associated therewit which are resonant to the frequencies of a plurality of signaling waveswhich it is desired to receive, means for impressing upon each of said receiving circuits desired signaling currents produced in one of said ground connections, and means for impressing upon each of said receiving circuits currents produced in the other ground connection and of suitable phase and intensity to neutralize therein the efiect of undesired currents received upon said antenna.

43. A receiving system fonradio signals comprising an aperiodic horizontal receivin antenna which is grounded at both ends and which has distributed constants of such value .that electric waves produced therein by desired signaling means will be propagated along its length at such a veloclty that increments of current produced in the antenna at points along its length by desired signaling waves in the ether will add to thecurrent flowing therein through a distance which is at least equal to 'a half wave length of the desired signaling wave, a plurality of i receiving circuits-associated therewith which are resonant to the frequencies of a plurality of'signaling waves which it is desired, to

receive, a prima-ry'winding in which desired signaling currents produced in the ground connection at one end of said antenna are caused to flow, a plurality of secondary windings coupled to said primary winding and associated with the respective receiving circuits and means for impressing upon each of said receiving circuits undesired currents produced in the ground connection at the other end of said antenna.

44'. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both'ends and which has distributed constants of such value thatelectric waves produced therein by desired signaling waves will be propagated along its length at such a velocity that increments of currents produced in the an tenna at points alongits length by desired signaling waves in the ether will add to the current flowing therein through a distance which is at least equal to a half wave len th of the desired signaling wave, a luraiity of receiving circuits associated t erewith which are resonant to thefre uencies of a plurality of signaling waves w ich it is desired to receive,.means for impressing upon said receiving circuits desiredjsignaling currents produced in said antenna at one point, an electron discharge device having an input circuit associated with said antenna at another point and, an output circuithaving means associated therewith for impressing upon said receiving circuits currents of a desired; phase and intensity.

45. A receiving system for radio signals comprising an aperiodic horizontal receiving antenna which is grounded at both ends and which has distributed constants of such value that electric waves produced therein by desired signaling waves will be propagated along its length at such'a velocity that increments of currents'produced in the antenna at points along its length by desired si naling waves in-the ether will add to t 0 current flo ing therein through a distance which is at east equal to a half wavelength ofthedesired signalin wave, a-pluralit of receiving circuits assoclated therewith w ich are resonant to the frequencies of a plurality of signaling waves which it is desired to receive, andwhich are located at a point along the length of said antenna adjacent toon'e of said ground connect-ions, means i orimpressing upon each of said receivi @circuits desired signaling currents produce; in a distaut .g'roundconnection, an electron discharge device having an input 'clrcultassociated with the adjacent groundf connection and'an outputcircuit which includes a plurality of primary windings, a secondary winding associated with each of said primary windings, and means,for impressing upon each of said receiving'circuits from an individual seleonda winding a current of a desired phase andlntensity.

46. The method of operating a radio receiving system comprising a horizontal aperiodic'receiving antenna which is grounded at both ends and a plurality of receiving sets which consist in impressin upon said receiving sets currents produce in said an-' tenna ata single selected point b a pluralityof desiredfsignaling waves of ifl'erent frequencies.

4:7. The method of operating a radio receiving system comprising a horizontal a eriodic receiving antenna which is grounded at both ends and a plurality'o f receivin sets which consists in impressing upon said receiving sets currents produced in one of the ground connections of said antenna by a plurality of desired signaling waves of different frequencies.

The method of operating a radio l'cceivlng system comprising a horizontal aperiodic receiving antenna which is grounded at both ends and a plurality of receiving sets which consists in impressing uponseud receiving sets currents produced in said antenna, at a single selected point and neutralizing the effect in each receiving set of undersired currents therein by impressing thereon currents of'equal intensity and opposite phase derived from a different selected point in said antenna.

49. The method of operating a radio ceiving system comprising a horizontal aperiodic receiving antenna which is grounded at both ends and a plurality of receiving sets which consists in impressing upon said receiving sets currents produced in one, of the ground connections of said antenna by a plurality of desired signaling Waves of different frequencies and neutralizing the effect in each receiving set of undesired currents therein by impressing thereon currents of equal intensity and opposite phase derived from the other ground connection.

50. The method of operating a radio receiving system comprising a horizontal aperiodic receiving antenna which is grounded at both ends and a plurality of receiving sets which consists in impressing upon said receiving sets currents produced in said antenna at a single selected point by a plurality of desired signaling waves of different frequencies, and impressing upon each receiving set currents derived from another selected point in said antenna.

51. The method of operating a radio receiving system comprising a horizontal aperiodic receiving antenna which is grounded at both ends and a plurality of receivin sets which consists in impressing upon sai receiving sets currents produced in one of ,the ground connections of said antenna by a plurality of desired signaling waves of different frequencies, and impressing upon each receiving set currentsderived from the other round connections. '52." he method of operating a radio receiving system comprising a horizontal aperiodicreceiving antenna which is grounded at both ends and a plurality of receiving sets which consists in impressing upon said receiving sets currents produced in said antenna at a singlelselected' point by a plu-. rality'of desired signaling. waves of different frequencies, impressing. upon each receiving set currents derived from another selected point in said antenna, and separately adjusting both thephas'e and intensity of the last mentioned currents.

53. The method of operating a radio receiving system comprising a horizontal aperiodic receiving antenna which is ground ed at both ends and a plurality of receivin sets which consists in impressing upon sai receiving sets currents produced in one of the ground connections of said antenna b ferent frequencies, impressing. upon each reround connection, and separately adjustmg both the phase and intensity of the last mentioned currents.

In witness whereof, I have hereunto set my hand this 29th day of April, 1921.

a plurality ofdesired signaling waves of di HAROLD H. BEVERAGE.

Certificate of Correction,-

It is hereby certified that in Letters Patent No. 1,434,985, granted November 7, 1922, upon the application of Harold H. Beverage, of Riverhe ad, New Yolfk, for an improvement in Radioreceiving Systems, errors appear in the printed specification requiring correction as follows: Page 1, line 10, for the word. system read system-8; page 2, strike out present line 80 and insert instead windings 1 and 2.? of which (we connected; page 4, line 118, claim 18'; for the, word or read of; page 5, line 5, claim 19, before the ord produced insert the word currents; same page, line 16, claim :20, and page 8, line 117, claim 51, for the Word connections read connection; page 8, line 3, claim 44, and line 28, claim 45, for the Word currents read current; same page, line 56, claim "46, for the word consist read consists; and that the said Letters Patent should be .read with these corrections therein that the same may conform to the record oi? the casein the Patent Oflice.

Signed and sealed this'9th day of January, A. D., 1923.

[ KARL FENNING,