US2505655A - Transmitting-receiving circuit arrangement for short waves - Google Patents

Transmitting-receiving circuit arrangement for short waves Download PDF

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Publication number
US2505655A
US2505655A US685199A US68519946A US2505655A US 2505655 A US2505655 A US 2505655A US 685199 A US685199 A US 685199A US 68519946 A US68519946 A US 68519946A US 2505655 A US2505655 A US 2505655A
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United States
Prior art keywords
oscillations
frequency
resonant circuit
tubes
transmitting
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US685199A
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English (en)
Inventor
Adelbert Van Weel
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • 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
    • H03D7/14—Balanced arrangements
    • H03D7/1416—Balanced arrangements with discharge tubes having more than 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/44—Transmit/receive switching
    • H04B1/46—Transmit/receive switching by voice-frequency signals; by pilot signals

Definitions

  • This invention relates to a transmitting-receiv ingcircuit-arrangement for short waves, in which for the reception, use is made of two mixing systems, to whose input-electrodes the incoming oscillations are supplied in push-pull and the local oscillations in the same phase.
  • This method of receiving has important advantages in transmitting ultra-high frequencies, as in this manner a smaller input damping and a more favourable signal-to-noise ratio is achieved.
  • Transmitting receiving circuit arrangements are known in which a tube acting as a local oscillator inthe case of reception is also used for'the generation of the oscillations to be transmitted.
  • a tube acting as a local oscillator inthe case of reception is also used for'the generation of the oscillations to be transmitted.
  • application of this method entails difficulties, as the local oscillations generated in single phasemust in this case first be converted into oscillations being symmetrical with respect to earth, in order to make them suitable for transmission by means of a dipole aerial.
  • these diificulti'es are avoded by providing means perm tting the said mixing systems or a couple of high-frequency amplifying systems preceding them and arranged in push-pull to be coupled back in such a manner that these systems generate oscillations that are transmitted by means of a dipole aerial.
  • the circuit constituted by the series-connectlon of the impedances common to the input circuits of the two mixing systems with the network formed by the non-common portions of these input circuits jointly with the input impedance of the systems, which circuitwill be referred to hereinafter as the single-phase input circuit, is preferably tuned to the frequency of the local oscillations to be used'for the reception, means being provided to couple back the mixing systems in such a manner as to generate the local oscillations thesaid circuit.
  • Th circuit-arrangement in question may comprise one or more switches by means of which such feed-hack impedances and/or damping resistances may optionally be switched in as to generate either the. oscillations to be transmitted. or the local oscillations tobe used for the reception.
  • the figure represents a transmitting-receiving circuit-arrangement in which a dipole aerial D, D" is used both for the reception and for the transmission of. oscillations.
  • a dipole aerial D, D is used both for the reception and for the transmission of. oscillations.
  • the incoming oscillations are inductively transmitted by means of an aerial coupling coil L0 to an input resonant circuit consisting of two inductances L1" and Li" and a tuning condenser C1 and whichis arranged in push-pull between the control-grids of two mixing triodes T and T".
  • junction of coils Li and; L1" is earthed through a variable condenser C2 and connected through a resistance R1 toasource of potential (not represented) whichsupplies a suitable negative biasto the controlgrids of the triode'sT and T".
  • the cathodes of the triodes T and T" are jointly connected to earth through an inductance Lawhich is coupled'with a coil L3 included in the output circuit of a local oscillator O' which is represented diagrammatically.
  • the coil La With the aid of the coil Lathe local oscillations are consequently supplied to the input circuits of the triodes by means of so-called cathodeinjection and this in such a manner that the local oscillations appear in the same phase on the control-grids of the two triodes.
  • a resonant circuit tuned to the intermediate frequency and consisting of two inductances Li and L4" and two condensers C4 and C" is connected in push-pull to the anodes of the two triodes.
  • coils L4 and L4" are connected high-frequency chokes L5 and L5" which serve to prevent the transmission of the incoming high-frequency oscillations to the receiver parts next to the mixing stage.
  • the junction of coils L4 and L4" is connected through a condenser G5, which constitutes practically a short-circuit to the intermediate frequency oscillations, to earth and through a resistance R2 to the positive terminal of a source of anode potential. (not represented).
  • the coils L4 and L4" are coupled inductively with a second intermediate frequency circuit 116,116 from which the output voltage of the circuit is taken.
  • junction of the condensers C4 and C4" is connected to the cathodes of the two triodes through impedances that will be described in detail hereinafter.
  • the input resonant circuit L1, L1, C1 will frequently have the form of a Lecher system.
  • Ihe triodes T and T" may advantageously be housed in one tube and, as the case may be, may have a cathode in common.
  • the singles phase input circuit which is constituted by the series-connection of the impedances (L2, C2) common to the input circuits of the two triode systems with the network constituted by the noncommon portions of these input circuits (L1', L1) jointly with the input capacities of the triode systems, is tuned to the frequency, which may, for instance, take place by adjustment of the condenscr C2.
  • the anode circuits of the triodes T and T include inductances L7 and L7 which jointly with the anode controlgrid capacities of the triode systems produce such a feed-back that the triode systems generate oscillations which are symmetrical with respect to earth and are transmitted by the dipole aerial D, D".
  • a modulation of these oscillations may, for example, be achieved by connecting a key S in series with the resistance R2.
  • the inductances L7 and L1" bring about a negative damping of the resonant circuit L1, L1, C1, which leads to the generation of the oscillations to be transmitted, and in addition a negative damping of the single-phase input circuit tuned to the oscillator frequency, due to which a single-phase oscillation might be generated in addition to the oscillations to be transmitted.
  • a condenser C7 is inserted in the connection common to the two tubes between the cathodes and the junction of the condensers C4 and C4", as a result of which the negative damping of the single-phase input circuit is removed again.
  • damping resistances may alternatel be included in the push-pull input circuit L1, L1", C1 and in the single-phase input circuit (for example in series with the condenser C2) In the last-mentioned case the condenser C1 and the coil Ls may be omitted.
  • the said damping resistances also, may be omitted and the oscillations to be transmitted and the local oscillations for the reception may be generated simultaneously, so that transmission and reception can take place without changing over and, if desired, simultaneously.
  • the mixing systems T and T may also be generated, as the case may be, by a couple of high-frequency amplifying systems preceding them.
  • Transceiver apparatus adapted selectively to generate high-frequency oscillations of a pred termined frequency and to mix incoming signals having a carrier of the same frequency with local oscillations, said apparatus comprising a pair of electron discharge tubes each having a cathode, a grid and an anode, first resonant circuit means to apply incoming signals in push-pull relation to the grids of said tubes, second resonant circuit means to derive in push-pull relation intermediate-frequency oscillations from the anodes of the tubes, means to apply local oscillations in parallel relation to the grids of the tubes, for mixing with said incoming signals, means to produce negative damping of said first resonant circuit means causing the generation of said high-frequency oscillations for transmission, and means selectively to actuate said local oscillation applying means and said negative damping producing means.
  • Transceiver apparatus as set forth in claim 1 wherein said means to effect negative damping of said first resonant circuit includes a pair of feedback inductors each interposed between a respective anode of said tubes and said second resonant circuit.
  • lransceiver apparatus adapted selectively to generate high-frequency oscillations of a predetermined frequency and to mix incoming signals having a carrier of the same frequency with local oscillations, said apparatus comprising a pair of electron discharge tubes each having a cathode, a grid and an anode, first resonant circuit means to apply incoming signals in push-pull relation to the grids of said tubes, second resonant circuit means to derive in push-pull relation intermediate-frequency oscillations from the anodes of the tubes, third resonant circuit means to apply local oscillations in parallel relation to the grids of said tubes, and means selectively to effect negative damping of said third resonant circuit means causing the generation of local oscillations and to effect negative damping of said first resonant circuit means causing the generation of said high-frequency oscillation.
  • Transceiver apparatus adapted selectively to generate high-frequency oscillations of a predetermined frequency and to mix incoming signals having a carrier of the same frequency with local oscillations, said apparatus comprising a pair of electron discharge tubes each having a cathode, a grid and an anode, a first resonant circuit tuned to said predetermined frequency and formed by a centertapped inductance in parallel with a capacitance connected between the grids of said tubes, a second resonant circuit tuned to the intermediate-frequency of said predetermined frequency and said local oscillations and formed by an inductance in parallel with a capacitance coupled between the anodes of said tubes, a third resonant circuit tuned to the frequency of said local oscillations and formed by an inductance connected in series with a capacitance between both cathodes of said tubes and the tap in the inductance of said first resonant circuit, a source of local oscillations, and means selectively to couple said source to said third resonant circuit for mixing with said
  • Transceiver apparatus adapted selectively to generate high-frequency oscillations of a predetermined frequency and to mix incoming signals having a carrier of the same frequency with local oscillations, said apparatus comprising a pair of electron discharge tubes each having a cathode, a grid and an anode, a first resonant circuit tuned to said predetermined frequency and formed by a centertapped inductance in parallel with a capacitor connected between the grids of said tubes, 2.
  • second resonant circuit tuned to the intermediate-frequency of said predetermined frequency and said local oscillations and formed by an inductance in parallel with a capacitance coupled between the anodes of said tubes, a third resonant circuit tuned to the frequency of said local oscillations and formed by an inductance connected in series with a capacitance between both cathodes of said tubes and the tap in the inductance of said first resonant circuit, and means selectively to effect negative damping of said third resonant circuit causing the generation of local oscillations for mixing with said incoming signals and to efiect negative damping of said first resonant circuit causing the generation of high-frequency oscillations for transmission.
  • Transceiver apparatus adapted selectively to generate high-frequency oscillations of a predetermined frequency and to mix incoming signals having a carrier of the same frequency with local oscillations, said apparatus comprising a pair of electron discharge tubes each having a cathode, a grid and an anode, said cathodes being interconnected, a first resonant circuit tuned to said predetermined frequency and formed by a centertapped inductance in parallel with a capacitance connected between the grids of said tubes, first and second feedback inductors, a second resonant circuit tuned to the intermediate frequency of the high-frequency and local oscillations and formed by an inductance in parallel with a pair of series-connected capacitances whose free ends are connected respectively through said first and second feedback inductors to the anodes of said tubes, at third resonant circuit tuned to the frequency of local oscillations and formed by an inductance connected in series with a capacitance between the inter-connected cathodes of said tubes and the tap in the inductance of said first
  • Apparatus as set forth in claim 6, further including a pair of high-frequency chokes interposed between the respective ends of the inductance in the second resonant circuit and the seriesconnected capacitances connected in parallel therewith.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Superheterodyne Receivers (AREA)
  • Transceivers (AREA)
US685199A 1943-07-23 1946-07-20 Transmitting-receiving circuit arrangement for short waves Expired - Lifetime US2505655A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL112335 1943-07-23
NL118229 1944-07-28

Publications (1)

Publication Number Publication Date
US2505655A true US2505655A (en) 1950-04-25

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Family Applications (2)

Application Number Title Priority Date Filing Date
US685199A Expired - Lifetime US2505655A (en) 1943-07-23 1946-07-20 Transmitting-receiving circuit arrangement for short waves
US728143A Expired - Lifetime US2503782A (en) 1943-07-23 1947-02-12 Transceiving circuit arrangement

Family Applications After (1)

Application Number Title Priority Date Filing Date
US728143A Expired - Lifetime US2503782A (en) 1943-07-23 1947-02-12 Transceiving circuit arrangement

Country Status (7)

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US (2) US2505655A (it)
BE (2) BE456891A (it)
CH (2) CH246395A (it)
DE (2) DE869090C (it)
FR (2) FR906033A (it)
GB (2) GB623069A (it)
NL (2) NL67076C (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2625650A (en) * 1948-10-16 1953-01-13 Sperry Corp Superregenerative apparatus
US2813155A (en) * 1954-02-23 1957-11-12 Motorola Inc Tone control for radio-phonograph combination
US2836663A (en) * 1953-04-21 1958-05-27 Motorola Inc Radio-phonograph combination
US2853559A (en) * 1954-05-03 1958-09-23 Underwood Corp Signal transfer selector
US2886653A (en) * 1953-08-31 1959-05-12 Rca Corp Amplitude modulated oscillator systems
US3624506A (en) * 1970-03-23 1971-11-30 John S Townsend Two-way electronic frequency converter
US4087751A (en) * 1975-12-26 1978-05-02 Nippon Electric Co., Ltd. Transmitter-receiver circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128851A (en) * 1982-09-24 1984-05-02 Jasco International Radio communication systems

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673968A (fr) * 1929-04-24 1930-01-22 Dispositif changeur de fréquence pour radiosignalisation
US1769920A (en) * 1929-04-30 1930-07-08 Bell Telephone Labor Inc Electrooptical transmission system
FR733947A (fr) * 1931-03-23 1932-10-13 Marconi Wireless Telegraph Co Perfectionnements aux systèmes amplificateurs thermo-électroniques et à leur application aux appareils récepteurs à haute fréquence
US1935316A (en) * 1931-09-16 1933-11-14 Bell Telephone Labor Inc Detector
US1974184A (en) * 1931-03-04 1934-09-18 Rca Corp Radio apparatus
US2018569A (en) * 1933-06-17 1935-10-22 Rca Corp Radio signaling apparatus
US2107395A (en) * 1933-12-13 1938-02-08 Schlesinger Kurt Radio receiving system
US2128422A (en) * 1933-01-26 1938-08-30 Rca Corp Ultrashort wave circuit
US2205359A (en) * 1938-06-24 1940-06-18 Hygrade Sylvania Corp Superheterodyne receiver
US2285372A (en) * 1940-05-30 1942-06-02 Strutt Maximiliaan Julius Otto Push-pull mixing circuit for ultrashort waves
US2296107A (en) * 1941-05-09 1942-09-15 Rca Corp Ultra high frequency converter
US2434474A (en) * 1941-01-28 1948-01-13 Hartford Nat Bank & Trust Co Circuit arrangement for ultra short waves

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR673968A (fr) * 1929-04-24 1930-01-22 Dispositif changeur de fréquence pour radiosignalisation
US1769920A (en) * 1929-04-30 1930-07-08 Bell Telephone Labor Inc Electrooptical transmission system
US1974184A (en) * 1931-03-04 1934-09-18 Rca Corp Radio apparatus
FR733947A (fr) * 1931-03-23 1932-10-13 Marconi Wireless Telegraph Co Perfectionnements aux systèmes amplificateurs thermo-électroniques et à leur application aux appareils récepteurs à haute fréquence
US1935316A (en) * 1931-09-16 1933-11-14 Bell Telephone Labor Inc Detector
US2128422A (en) * 1933-01-26 1938-08-30 Rca Corp Ultrashort wave circuit
US2018569A (en) * 1933-06-17 1935-10-22 Rca Corp Radio signaling apparatus
US2107395A (en) * 1933-12-13 1938-02-08 Schlesinger Kurt Radio receiving system
US2205359A (en) * 1938-06-24 1940-06-18 Hygrade Sylvania Corp Superheterodyne receiver
US2285372A (en) * 1940-05-30 1942-06-02 Strutt Maximiliaan Julius Otto Push-pull mixing circuit for ultrashort waves
US2434474A (en) * 1941-01-28 1948-01-13 Hartford Nat Bank & Trust Co Circuit arrangement for ultra short waves
US2296107A (en) * 1941-05-09 1942-09-15 Rca Corp Ultra high frequency converter

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2625650A (en) * 1948-10-16 1953-01-13 Sperry Corp Superregenerative apparatus
US2836663A (en) * 1953-04-21 1958-05-27 Motorola Inc Radio-phonograph combination
US2886653A (en) * 1953-08-31 1959-05-12 Rca Corp Amplitude modulated oscillator systems
US2813155A (en) * 1954-02-23 1957-11-12 Motorola Inc Tone control for radio-phonograph combination
US2853559A (en) * 1954-05-03 1958-09-23 Underwood Corp Signal transfer selector
US3624506A (en) * 1970-03-23 1971-11-30 John S Townsend Two-way electronic frequency converter
US4087751A (en) * 1975-12-26 1978-05-02 Nippon Electric Co., Ltd. Transmitter-receiver circuit

Also Published As

Publication number Publication date
CH255008A (de) 1948-05-31
NL61584C (it)
GB628862A (en) 1949-09-06
US2503782A (en) 1950-04-11
DE869090C (de) 1953-03-02
CH246395A (de) 1946-12-31
BE466841A (it)
FR906033A (fr) 1945-12-20
NL67076C (it)
FR75251E (fr) 1961-10-04
DE872235C (de) 1953-03-30
BE456891A (it)
GB623069A (en) 1949-05-11

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