US1696437A - Radio receiving apparatus - Google Patents

Description

R. E. HUMPHREY RADIO RECEIVING APPARATUS Dec. 25, 1928.

Filed Nov. 5, 1924 Patented Dec. 25, 1928.

UNITED STATES PATENT (OFFICE.

REGINALD 1:. many, or swm'rom vnamonr.

' My inveiition relates broadly to a radioreceiving system and more particularl to a circult arrangement for an electron tu e system at a radio receiving station wherein the funcprovide an in\expensive form of radio receiv-.

odes and anodes for dontrollin am tions of radio fre uency amplification, rectification and audio equency amplification may be simultaneously erformed without the generation of 0 cillatlons or disturbing currents in the radio receiving system.

, One of the objects of my invention is to mgapparatus having a high degree of eifi clency and capable of volume reception of the incomin sign lin ener y.

Anoth er obj ct if my invention. is to provide an arrangement of electron tube and c' cuit therefor'vs herein the tube functions s1- multaneously asa radio frequency amplifier, a rectifier and anaudio frequency amplifier.

Still another object of my invention is to provide a construction of electron tube including a plurality of setsvof electrodes, one set of which seq-Wes for the amplilfication o; incoming signa in ener at a urality 0, different frequencisywli il e the gther set of electrodes operates to produce the said difference in frequency by a process of rectification.

A- still further object of my invention is to provide a tube construction wherein an evacuated vessel is provided with a pair of cathodes and a pair of anodes with a con 01 electrode interposed between one of sad cathification of energy at both radio and audio frequencies while the other cathode and anode are arranged for the rectification of electrical ener y.

invention contemplates the provision of a circuit for radio receiving systems wherein a single tube may be employed to produce a greater volume amplification of the incoming signaling energy than. has heretofore been ossible. It is unnecessay to employ auxiliary rectificationdevices with the tube of my invention by reason of the inherent'rectification powers possessed by the tube in addition to its powers of amplification at diiferentfrequenmes. 4

M invention will be more clearly understoo b reference to the following specification an from the accompanying drawings. in which: 0

Figure 1 illustrates the appllcatlon of the electron tube of m invention to a radlo re arrangement of the plurality of sets of electrodes within the evacuated vessel.

Heretofore in the art it has been proposed to amplify incoming signaling energy at a dio frequencies. It has been necessary to utilize a plurality of three electrode tubes in order to accomplish'desirable results or it has been necessary to utilize a rectifier of the -crystal variety in reducing the frequency of the incoming ra io frequency energy to a readily amplifiab io frequency at which radio receiving station at both radio and authe signals might be observed The employment of this apparatus lends complications in a radio receiving system which is cmployed'as a receiver of broadcast entertainment by a novice or one unskilled in the art. The employment of a number of individual pieces in a broadcast receiver requires independentadjustment of several controls by an operator who may be unskilled in the art with the result that imperfect reception is secured. Furthermore the several pieces of apparatus heretofore required have een undesirable sources of expense'and it is the purpose of my present invention to providea simplified artrangement of radio broadcast receiver wherein the tube and the circuit provided for the tube performs simultaneously a plurality of functionswithout undesirable oscillation, regeneration or reradiation of the signaling energy;

Referring more particularly to the draw- 5 is coupled to the primary win mg 4 and is tuned by secondary condenser 7. The elec; tron tube comprises an evacuated vessel 8,

f. Y supports 9 and 10 at one end of t'hf fiitube and 11 and 12 at be other endof the tube between which the filamentary cathodes 14 and 15 are'supported. Connections 16 and I 17 are brought out from the opposite terminals of the, Y supports and taken to the oathode heatin' circuit. A control electrode 18 .is provide adjacent .the cathode 15 'ee nnected with the external circuit through con- -ductor 19. A plate or anode electrode 20'is positioned adjacent the control electrode 18 and in a position to receive electronic bomceiving circuit; an Figifishowsindetail bardment from cathode 15. A connection winding tary cathode 14.

-tion circuit.

anode 20 of the tube as represented at 20 The other anode 21 of the tube is disposed adjacent cathode 14 and is connected with the external receiving circuit through lead 21. Radio frequency signaling energy is impressed on the input circuit of the electron tube by connections extending fronr the tuned circuits 5 and 7 through the conductor19 to control electrode 1.8 and from the other side of the tuned circuit through a condenser 28 and a connec ti on back to the cathode 15. The circuit described forms the input circuit for the tube operated at radio frequency. The output circuit formed by anode 20, lead 20 primary winding 23 of the radio frequency transformer 22. condenser 26, high potential battery 27 and a return connection to the cathodes 14 and 15. The transformer 22 is provided with a secondary winding 24 in which amplified radio'frequency energy is cvistent having been transferred from the primary winding'28. The secondary winding 24 is connected in circuit with primary 31 of audio frequency transformer 29 with a returnconnection to the filamen- The other side of thesecnudary winding 24: connects with anode 21 through lead 21 completing the rectifica- The filamentary cathodes 14 and 15 are heated to incandescence from a source of potential. 32 under control of rheostat 33. The audio frequency transformer 29 operates to transfer energy from the priis brought out from mary Winding 31 to the secondary winding {3-0 at audio frequency, which energy is again mpressed upon the input circuit comprising; control electrode 19 and cathode 15 whereby the energy 1s eonsiderablyfamplified and finally caused to operate responsive device in the output circuit of the set of electrodes comprising the amplification system of the tube.

It Will be observed that the electron tube contains one set of electrodes independent from another set of electrodes with circuit connections between the electrodes arranged for the amplification of the incoming signaling energy at adio frequency, next the rectification of the said energy and finally the amplification of the rectified energy at audio frequency. In this manner a. plurality of functions are performed by the same electron tube and the receiving system is simplified and its cost reduced so that it is readily available to the general public.

While I have described my invention in certain particular embodiments I desire that it be understood that modifications may be made and that I intend no limitations upon the invention other than those imposed by the scope of the appended claim.

What I claim and desire to secure by Let- 'tersPatent ofthe United States is as follows An electron tube structure comprising in combination an evacuated vessel, a pair of Y-shaped conductive members extending into said evacuated vessel with the axes thereof centered one over the other and aligned with each other at opposite ends thereof, a pair of filamentary cathodes supported from the extremities of said Y-shaped conductive members, an anode mounted adjacent one of said filamentary cathodes, and a grid and .anode mounted adjacent the other of said filamentary cathodes. v

REGINALD E. HUMPHREY.

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