US2107395A - Radio receiving system - Google Patents

Radio receiving system Download PDF

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Publication number
US2107395A
US2107395A US757300A US75730034A US2107395A US 2107395 A US2107395 A US 2107395A US 757300 A US757300 A US 757300A US 75730034 A US75730034 A US 75730034A US 2107395 A US2107395 A US 2107395A
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circuit
frequency
intermediate frequency
grids
anode
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US757300A
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English (en)
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Schlesinger Kurt
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/66—Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers

Definitions

  • the invention relates to a back-coupling arrangement for a receiver without transposing the received frequency or with transposing the received frequency fe to a higher or lower inter 5 mediate frequency jz by means of a local oscil lation frequency i
  • the connection systems according to the invention possess the following essential advantages in comparison with the known connections:
  • the degree of amplification and selectivity is increased by using back-coupling for the receiving frequency or for the intermediate-frequency and by extending this back-coupling to such a degree that normally self-excitation would take place. This self-excitation is prevented by causing the tube to oscillate with a frequency greater than the backcoupled frequency.
  • Fig. 1 shows a circuit diagram of a superheterodyne receiver according to the invention.
  • Fig. 2 shows a circuit diagram of a receiver without using transposing the frequency.
  • Fig. 3 shows a superheterodyne receiver with two mixing tubes in push-pull connection and Fig. 4 shows a modification of the circuit of Fig. 3.
  • a local oscillator l with screening grid, and preferably with twin control grids 2 and 3, is in self-excitation with the natural wave of the circuit 4, 5, and thus produces the frequency ,ffi-
  • the superimposed connection is built up as capacitative or inductive three-point connection, whereby the capacitative connection is preferably employed for short to ultra-short waves, and the inductive connection for long waves.
  • the intermediate frequency circuit 7, 8 At a centre-tapped point 6 of this local oscillation circuit there is coupled the intermediate frequency circuit 7, 8.
  • the feeding of this circuit with the anode potential or the dynamic earthing of this circuit through the medium of the blocking condenser 9 also takes place in a centre-tapped point of the sc circuit,
  • the input circuit i5, i5 is tuned to the frequency value of the oscillations to be received and leads via condenser iii to one grid (2) of the mixing stage i, said grid (2) being supplied with a suitable bias via the resistance-arrangement IT, IS.
  • the other grid (3) of said mixing stage i is connected by means of the coupling-condenser .H and the oscillatory circuit i, 5 with the anode of valve i.
  • This oscillatory circuit is tuned to a very high frequency ffi, which represents the superheterodyne frequency.
  • the circuit In view of the inherent capacities of the valve l between the grids 2 and 3 and the anode of said valve the circuit generates the frequency i and simultaneously the input grid 2 controls the electron stream of valve 2, such producing in the of coil 5 and earth, said circuit 1, 8 having a U centre tap of its coil earthed by means of a condenser 9.
  • a bacl -coup-1ing is used between the oscillatory grid and circuit and the anode circuit for the intermediate frequency by means of condenser lil.
  • This back-coupling effect may be increased in such a manner that, normally, if the oscillatory circuit i, 5 would not exist in the anode circuit, a self-oscillating effect with respect to the intermediate frequency would arise. Since in this case of self -oscillating in the frequency jz this frequency fz could not be further used in the associated circuit, this self-oscillating of the intermediate frequency z must be prevented which is realized by the use of the oscillatory circuit tuned at a frequency value much greater than that of fz.
  • the centre-tapped connections are required for the feed-supply of the anode of valve l for preventing detrimental efi'ects upon the resonant circuits by unsymmetrical conditions.
  • the circuit 1, 8 is coupled inductively with a band-filter output circuit I3, [4, which is also tuned to the frequency fz.
  • the amplification of the mixing stage I may be additionally regulated without interruption of the oscillations by means of a potentiometer I! connected with the negative pole of the anode current source through the medium of a grid resistance 18 in place of which, as well known, there may also be employed an automatic regulating means.
  • the condenser may be used for neutralizing the currents of the oscillatory frequency ffl coupled by the inherent capacities of the valve to the input-grid circuit, such preventing radiating of the local oscillations by the aerial.
  • connection system asserts itself in comparison with the known connections principallybecause the intermediate frequency circuits in the usual combined detector oscillator circuits are, owing to the presence of very powerful amplitude in the connected mixing tubes, always loaded by extensive auxiliary damping from the tube, which may also be compensated by the method of back-coupling arrangement according to the invention.
  • Elimination of the radiation of fii from the aerial is accomplished in accordance with the invention by a condenser 20, which compensates the component potential of Afi transmitted by the internal capacity 2
  • the invention may also be employed as sensitive, back-coupled single circuit receiver without utilizing a frequency transposition.
  • the circuit 15, I6 coupled with the aerial and also circuit 1, 8 shown in Fig. 1 is tuned to the receiving frequency.
  • the short-wave oscillation circuit 4, 5 is tuned to a wave which is shorter than any wave which may be received. Short wave oscillations generated by the circuit 4, 5 prevent in accordance with the invention the self-excitation of the receiving frequency, and'there is obtained at the circuit 1, 8 a considerable selectivity and high-frequency amplification without cause for anxiety that this circuit might undergo self-oscillation.
  • the desired intermediate frequency potential A is tapped as the difference potential of the anodes of the two mixing tubes in relation to each other.
  • the input receiving potential is passed to each grid in counter-phase if the superposition on both grids is co-phasal or if necessary reversed.
  • the first method is employed according to Fig. 3 primarily in the case of infradyne connections, in which the intermediate frequency fz to be obtained is in the order of the local oscillation I and the latter on the other hand in superheterodyne receiver connections, in which fz is much longer than ffi.
  • Fig. 3 shows two mixing example twin-grid tubes. Single-grid tubes, however, are also suitable, and these may then have twice the steepness.
  • the anodes of these tubes are connected through the medium of an intermediate frequency circuit comprisingthe tubes Hand 23, for
  • the coil 28 is tapped at the centre, or the-condenser 21 earthed at the centre (differential condenser).
  • the feeding of this local oscillation f occurs in each case through a part-plate 29 or 30 of a differential condenser.
  • the additional back-coupling for the intermediate frequency in accordance with the invention may be established and regulated through the medium of another plate-armature 3
  • the oscillatory grids are leaked off over resistances 33, 34, whereby a very desirable negative charging of the same is capable of being adjusted.
  • the reception is fed in counter-cadence from the aerial circuit 4
  • This supply circuit damps the local oscillation frequency ffi produced in cadence, and must, therefore, be supplied through the medium of a resistance 39, which is large for this frequency.
  • the connection system has the advantage of a complete de-coupling of the intermediate frequency circuit from the local oscillation circuit even in the case of slight difference in frequency between the same.
  • a band filter output circuit 40 is coupled with the circuit 24, 25.
  • the induced E. M. F. is proportional to the input receiving potential and disappears if the input receiving potential in the circuit 35,36 disappears.
  • coupled with the circuit 35, 36 is in each The feeding of the tube with the case free of radiation as compared with the,
  • the self-excitation takes place through the medium of two small condensers 52, 53 (approximately cm.), for example Mesny condensers.
  • Two oscillatory chokes 54, 55 ensure that potentials of the high local oscillation frequency are able to build up in suf- They allow, however, the long-Wave intermediate frequency-fa to reach the circuit 56, 51 without being weakened.
  • Two larger condensers 58, 59 may then be employed for the intermediate frequency fiz according to the invention. Its simultaneous superposition to the already existing grid potentials of the frequency in takes place in the form of embodiment according to Fig. 3 by capacitative distribution of potential,
  • the small condensers 60, Bl ensure that the back-coupled intermediate frequency potential is not possibly short-circuited by the local oscillation circuit ii, 45.
  • the same purpose is served by the series resistances 62, 53 of approximately 1000 ohms, which cause the local oscillation frequency c not to be possibly interrupted upon the application of the intermediate frequency back-coupling 58, 59 owing to short-circuiting of the oscillatory chokes 54, 55.
  • the same result may also be obtained by methods known per se of mixing two greatly diifering frequencies.
  • a band filter 64, 65 is coupled with the intermediate frequency circuit 56, 51, and allows the intermediate frequency to be tapped without interfering traces of local oscillation frequency.
  • the fading regulation may extend not only to the twin grids 49, 50 but at the same time also to the oscillator grids, as in the stated connection the beginning of the generation of the oscillations is very soft, more particularly when using audion combination with highly ohmic resistances 66, 61.
  • An additional advantage of this connection system is the elimination of certain harmonics of the superposition and the reception, and accordingly a reduction in the number of the usual whistling points in the superheterodyne receiver.
  • the feeding with anode current does not damp any of the existing oscillations with the exception of the received wave, which is amplified directly in cadence, this being in any case desirable.
  • the blocking condenser 68 causes a dynamic earthing of the circuit middle point of fz.
  • the selectivity of which may be adjusted by hand according to requirements in individual cases.
  • these possibilities do not exist.
  • the method according to the invention possesses the additional advantage of a great decrease in the number of circuits.
  • the method according to the invention offers the considerable advantage that even in the case of exaggerated back-coupling a self-excitation of the oscillatory circuit free of attenuation is unable to occur, as this is always withheld by the local oscillation.
  • an'electronic valve having a cathode, an anode and at least two controlgrids, a receiving input circuit coupledwith an aerial circuit and connected with said cathode and one of said control grids, an oscillatory circult tuned to a frequency greater than the receiving frequencies and connected with said anode and the other of said control grids, a back-coupling circuit for the receiving frequency connected with a tapped-point of said oscillatory circuit and an anode current source and firmly coupled with said receiving input circuit.
  • a superheterodyne receiver an electronic valve having a cathode, an anode and at least two control-grids, a receiving input circuit coup-led with an aerial circuit and connected with said cathode and one of said control-grids, an oscilla tory circuit for producing an interinedate frequency connected with said anode and the other of said control-grids, an intermediate frequency circuit connected with a tapped-point of said oscillatory circuit, a back-coupling circuit for said intermediate frequency, said oscillatory circuit tuned to'a frequency greater than the intermediate frequency, therefore generating oscillations preventing self-excitation for the intermediate frequency.
  • a superheterodyne receiver In a superheterodyne receiver an electronic valve having a cathode, an anode and at least two control-grids, a receiving input circuit coupled with an aerial circuit and connected with said cathode and one of said control grids, an oscillatory circuit for producing an intermediate frequency connected with said anode and the other of said control-grids over a block-condenser, an intermediate frequency-circuit connected with a tapped-point of said oscillatory circuit and over a variable condenser with said second control grid and over a resistance with said cathode, therefore effecting a back-coupling for the intermediate frequency, a tapped-point of said intermediate frequency circuit connected over a resistance with an anode-current source and over a condenser with an earthing point, said oscillatory circuit tuned to a frequency greater than the intermediate frequency, therefore generating oscillations preventing self-excitation for the intermediate frequency.
  • an electronic valve having a cathode, an anode, and. at least two control-grids, a receiving input circuit coupled with an aerial circuit and connected with said cathode and one of said control-grids, an oscillatory circuit for producing an intermediate frequency connected with said anode and the As compared with the known other of said control-grids over a block-condenser, an intermediate frequency-circuit connected with a tapped-point of said oscillatory circuit and over a variable condenser with said second control grid and over a resistance with said cathode, therefore effecting a back coupling for the intermediate frequency, a tapped-point of said intermediate frequency connected over a resistance with an anode-current source and over a condenser with an earthing point, said oscillatory circuit tuned to a frequency greater than the intermediate frequency, therefore generating oscillations preventing self-excitation for the intermediate frequency, said intermediate frequency circuit being coupled with a band-filter output circuit.
  • a superheterodyne receiver having a cathode, an anode and at least two control-grids, a receiving input circuit coupled with an aerial circuit and connected with said cathode and one of said control grids, an oscillatory circuit for producing an intermediate frequency connected with said anode and the other of said control-grids over a block-condenser, an intermediate frequency-circuit connected with a tapped-point of said oscillatory circuit and over a variable condenser with said second control grid and over a resistance with said cathode, therefore effecting a backcoupling for the intermediate frequency, a tapped-point of said intermediate frequency connected over a resistance with an anode-current source and,
  • said oscillatory circuit tuned to a frequencygreater than the intermediate frequency, therefore generating oscillations preventing self-excitation for the intermediate frequency, said intermediate frequency circuit being coupled with a bandfilter output circuit, the internal capacity between said control-grids being compensated by a neutrodyne condenser.
  • a superheterodyne receiver two electronic valves, each of which having a cathode, an anode and at least two control grids, a receiving input circuit coupled with anaerial circuit and connected with the control grids of said valves, the control grids of said valves connected over differential condensers with each other, with the one side of an oscillatory circuit for producing an intermediate frequency and with an intermediate frequency circuit, the other side of oscillations preventing self-excitation for the in-v termediate frequency.
  • a superheterodyne receiver two electronic valves each of which having a cathode, an anode and at least two control grids, one control grid of one of said valves connectedrwith one control-grid of the otherof said valves and with a receiving input circuit coupledwith an aerial circuit, the other control grids of said valves connected over block-condensers with an oscillatory circuit and over small condensers with an anode of the other valve, an intermediate frequency circuit connected over oscillating coils with the anode of said valves, a tapped point of said intermediate frequency circuit connected with an anode current source, the cathodes of said valves connected with each other,

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
US757300A 1933-12-13 1934-12-13 Radio receiving system Expired - Lifetime US2107395A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE194293X 1933-12-13

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US2107395A true US2107395A (en) 1938-02-08

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US757300A Expired - Lifetime US2107395A (en) 1933-12-13 1934-12-13 Radio receiving system

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US (1) US2107395A (it)
BE (1) BE406777A (it)
CH (1) CH194293A (it)
GB (1) GB450247A (it)
NL (1) NL43529C (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2475064A (en) * 1944-08-08 1949-07-05 Hartford Nat Bank & Trust Co Ultra high frequency mixer circuit
US2505655A (en) * 1943-07-23 1950-04-25 Hartford Nat Bank & Trust Co Transmitting-receiving circuit arrangement for short waves
US2510165A (en) * 1945-05-04 1950-06-06 Int Standard Electric Corp Heterodyne oscillator
US2538715A (en) * 1943-10-18 1951-01-16 Hartford Nat Bank & Trust Co Push-pull mixing circuit arrangement
US2548132A (en) * 1945-07-17 1951-04-10 Sylvania Electric Prod Superheterodyne receiver employing triode converters
US2606284A (en) * 1943-03-27 1952-08-05 Hartford Nat Bank & Trust Co Mixing circuit arrangement
US2753449A (en) * 1952-01-30 1956-07-03 Gail E Boggs Superheterodyne mixer with negative feedback for stabilizing conversion gain
US2808505A (en) * 1953-01-12 1957-10-01 Telefunken Gmbh Constant-gain amplifier system
US2859336A (en) * 1951-10-22 1958-11-04 Philips Corp Frequency conversion of signal oscillation without use of an auxiliary local oscillation
US3332022A (en) * 1963-10-21 1967-07-18 Blonder Tongue Elect Tunnel diode converter system

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL164858B (nl) * 1951-10-22 Egyt Gyogyszervegyeszeti Gyar Werkwijze voor het bereiden van een derivaat van 2,10- -dichloor-6-carboxy-12h-dibenzo (d, g) (1,3) dioxocine of een zout daarvan en werkwijze voor het bereiden van een op de stofwisseling werkend farmaceutisch preparaat onder gebruikmaking van een dergelijke verbinding.
DE972522C (de) * 1951-12-04 1959-08-06 Telefunken Gmbh Mischschaltung fuer UEberlagerungsempfaenger, insbesondere fuer den UKW-Empfang
NL105942C (it) * 1956-08-24
DE1083354B (de) * 1958-03-20 1960-06-15 Telefunken Gmbh Schaltungsanordnung zur Entdaempfung des abgestimmten ZF-Kreises einer selbstschwingenden Mischstufe mit Transistor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2606284A (en) * 1943-03-27 1952-08-05 Hartford Nat Bank & Trust Co Mixing circuit arrangement
US2606283A (en) * 1943-03-27 1952-08-05 Hartford Nat Bank & Trust Co Mixing circuit arrangement
US2609495A (en) * 1943-03-27 1952-09-02 Hartford Nat Bank & Trust Co Push-pull mixing circuit arrangement
US2505655A (en) * 1943-07-23 1950-04-25 Hartford Nat Bank & Trust Co Transmitting-receiving circuit arrangement for short waves
US2538715A (en) * 1943-10-18 1951-01-16 Hartford Nat Bank & Trust Co Push-pull mixing circuit arrangement
US2475064A (en) * 1944-08-08 1949-07-05 Hartford Nat Bank & Trust Co Ultra high frequency mixer circuit
US2510165A (en) * 1945-05-04 1950-06-06 Int Standard Electric Corp Heterodyne oscillator
US2548132A (en) * 1945-07-17 1951-04-10 Sylvania Electric Prod Superheterodyne receiver employing triode converters
US2859336A (en) * 1951-10-22 1958-11-04 Philips Corp Frequency conversion of signal oscillation without use of an auxiliary local oscillation
US2753449A (en) * 1952-01-30 1956-07-03 Gail E Boggs Superheterodyne mixer with negative feedback for stabilizing conversion gain
US2808505A (en) * 1953-01-12 1957-10-01 Telefunken Gmbh Constant-gain amplifier system
US3332022A (en) * 1963-10-21 1967-07-18 Blonder Tongue Elect Tunnel diode converter system

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GB450247A (en) 1936-07-13
BE406777A (it)
NL43529C (it)
CH194293A (de) 1937-11-30

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