US2595997A - Receiver for short waves - Google Patents

Receiver for short waves Download PDF

Info

Publication number
US2595997A
US2595997A US683001A US68300146A US2595997A US 2595997 A US2595997 A US 2595997A US 683001 A US683001 A US 683001A US 68300146 A US68300146 A US 68300146A US 2595997 A US2595997 A US 2595997A
Authority
US
United States
Prior art keywords
circuit
lecher
frequency
oscillations
push
Prior art date
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
Application number
US683001A
Other languages
English (en)
Inventor
Adelbert Van Weel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2595997A publication Critical patent/US2595997A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/54—Amplifiers using transit-time effect in tubes or semiconductor devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H03H2/008—Receiver or amplifier input circuits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range

Definitions

  • This invention relates to a circuit arrangement for mixing ultra-high frequency oscillations, which circuit is tunable over a large range of frequencies and in which one of the oscillations to be mixed is fed in the same phase and the other frequency through a Lecher system in push-pull connection to the input electrodes of two discharge systems.
  • This mixing method yields great advantages more particularly in transmitting ultra-high frequencies, since it permits the obtainment of a lower input damping and a better signal-to-noise ratio.
  • the aforesaid Lecher system is designed in such manner that by controlling this system the push-pull circuit is tuned to the frequency of the oscillations supplied in push-pull and the said (single phase) circuit is tuned at the same time to the frequency of the oscillations supplied in the same phase.
  • this simultaneous tuning can be ensured by giving the Lecher system such proportions that the product of the surge resistance and the terminal capacity of the two Lecher lines with respect to one another is equal or substantially equal to the product of the surge resistance and the terminal capacity of the two Lecher lines jointly with re spect to earth.
  • the Lecher system is preferably designed in such a manner that the surge resistance of the two Lecher lines with respect to one another is about four times as high as the surge resistance of the two Lecher lines jointly with respect to earth.
  • the sole figure represents a mixing circuit arrangement embodying the invention and forming part of a superheterodyne receiver for short waves.
  • the incoming oscillations are supplied in push-pull and the local oscillations in the same phase to the control grids of two discharge systems T and T.
  • the oscillations picked up by a dipole antenna D, D" are fed to "two conductors L1 and L1 forming part of a Lecher system which is tunable to the frequency of the incoming oscillations by means of a short circuit bridge K.
  • the short-circuit bridge K and the junction of the cathodes of the two discharge systems are connected to earth.
  • the end 01' the Lecher system which is located on the side of the short-circuit bridge K remote from the discharge systems, is made inoperative by termination with a resistance R2 whose value corresponds to the surge resistance of the Lecher lines L1, L1 with respect to one another.
  • the end of the Lecher system constituted by the two Lecher lines in parallel-connection with respect to earth is terminated by the surge resistance in question.
  • the middle of the resistance R2 is connected to earth through the intermediary of a resistance R3. In this case it may occur that the middle of the resist ance R2 should be directly connected to earth.
  • the input impedances of the two discharge systems are represented by the capacities C1, C1.
  • the two triodes T, 'I may advantageously constitute a single tube and may have a common cathode, if desired.
  • a resonant circuit tuned to the intermediate frequency and consisting of two coils La, La" and two condensers C2, C2" is connected in push-pull arrangement to the anodes of the two triodes.
  • high-frequency chokes L2, L2 which serve to prevent a transmission of the incoming high-frequency oscillations to the receiver parts next to the mixing circuit arrangement.
  • the junction of coils L3, L3 is connected to earth through a condenser C3, which practically constitutes a short-circuit in regard to the intermediate frequency oscillations, and through a resistance R1 to the positive terminal of a source of anode potential (not represented).
  • coils L3, L3 are inductively coupled with another intermediate frequency circuit L4, C4, from which is taken the output voltage of the circuit.
  • the junction of condensers C2, C2" is connected through an inductance L2 to the cathodes of the two triodes.
  • the single-phase circuit constituted by the parallel-connected impedances of the lines L1 and L1 with respect to earth and the parallel-connected input impedances C1 and C1" of the two triodes is tuned to this frequency.
  • this tuning can be ensured only by interposing a variable impedance, for instance between the junction of the cathodes and earth.
  • this complication can be avoided by designing the Lecher system L1, L1 in such manner that the adjustment of this system involves the simultaneous tuning of the push-pull circuit to the frequency of the incoming oscillations and of the single phase circuit to the frequency of the local oscillations.
  • the two Lecher lines L1, L1" not only constitute a Lecher system with respect to one another, but the two lines in parallel connection likewise constitute a Lecher-system with respect to earth.
  • the two systems can be tuned simultaneously, provided the proportions of the Lecher lines with respect to one another and of the Lecher lines with respect to earth satisfy a definite condition.
  • the tuning of a short-circuited Lecher system depends on the product of its surge resistance and the impedance provided over the not short-circuited end, which impedance is usually a capacity (terminal capacity).
  • this terminal capacity is constituted by the series-connection of the two input capacities of the discharge systems C1 and C1" as far as the singlephase circuit is concerned it is constituted, in contradistinction thereto, by the parallel connection of the capacities C1 and C1".
  • the intermediate frequency of the receiver is not very high and consequently, the frequency of the local oscillations substantially corresponds to the frequency of the incoming oscillations, these two products should be about equal.
  • the surge resistance of the two Lecher lines should be four times as high as the surge resistance of the two Lecher lines jointly with respect to earth, since in this case the terminal capacity constituted by the series connection is four times as small as the terminal capacity constituted by the parallel-connection of the input capacities C1, C1.
  • Lecher system L1, L1" is located opposite an earthed metal plate, and the distance between the Lecher system and the said plate being variable.
  • the surge resistance of the Lecher system which is constituted by the parallel connected Lecher lines L1, L1" and the metal plate, may be adjusted to the desired value.
  • the terminal capacities may be variable so as to achieve the desired value of the product of surge resistance and terminal capacity.
  • the input capacity of the push-pull circuit may be increased by providing a condenser between the two control grids, or the input capacity of the single-phase circuit may be decreased by interposing a condenser between the junction of the cathodes and earth.
  • these expedients are less advisable than the aforesaid adjustment of the ratio of the surge resistances, since the input impedance of the circuit falls off due to the increase in input capacity of the push-pull circuit, and the cathodes are no longer earthed due to the insertion of a condenser between the cathodes of the discharge systems d earth.
  • connection of the short-circuit bridge K to the metal plate must be designed. in such a manner that this connection acts, in effect, as a short-circuit bridge in regard to the Lecher system constituted by the parallel connection of the line L1, L1 with respect to earth.
  • the embodiment shown in the figure indicates the use of two triodes, but the invention is not so limited. Any discharge system could be used which provides similar characteristics. tetrodes, pentodes, etc, could be used or a duo Diodes,
  • junctions between the dipole antenna and the Lecher system L1, L1" may be variable to permit optimum matching of the antenna to the discharge systems for every frequency to which the receiver is tuned.
  • the push-pull circuit is provided between the two control grids of the triodes T and T", the cathodes being interconnected.
  • the push-pull circuit may be provided between the cathodes and the control grids may be interconnected.
  • the incoming oscillations are supplied in push-pull connection and the local oscillations in the same phase to the input electrodes of the discharge systems, but it is also possible to feed the local oscillations in push-pull and the incoming oscillations in the same phase to the input electrodes.
  • a high frequency mixing circuit arrangement tunable over a wide frequency band comprising first and second electron discharge mixer elements each comprising a cathode, a control grid and an anode, a first Lecher system comprising two Lecher lines each connected to the control grid of one of said mixing elements, said Lecher system having a given surge impedance and having a given terminal capacity consisting essentially of the input capacitance of said mixer elements connected in series, means coupled to said Lecher lines to apply a signal wave to said Lecher lines in push-pull relationship, a second Lecher system comprising said two Lecher lines and a conductor in spaced relationship to said Lecher lines, said conductor being coupled to the cathode of said mixing elements in the same phase relationship, means to apply an oscillator wave to said two Lecher lines in the same phase relationship, said latter means comprising an inductive reactance having one end thereof coupled to said cathodes and having the other end thereof coupled to said anodes, said second Lecher system having a terminal capacity consisting essentially of the input capacity of said

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
US683001A 1943-10-27 1946-07-12 Receiver for short waves Expired - Lifetime US2595997A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL250225X 1943-10-27

Publications (1)

Publication Number Publication Date
US2595997A true US2595997A (en) 1952-05-06

Family

ID=19781056

Family Applications (1)

Application Number Title Priority Date Filing Date
US683001A Expired - Lifetime US2595997A (en) 1943-10-27 1946-07-12 Receiver for short waves

Country Status (7)

Country Link
US (1) US2595997A (ko)
BE (1) BE459216A (ko)
CH (1) CH250225A (ko)
DE (1) DE862028C (ko)
FR (1) FR920715A (ko)
GB (1) GB638004A (ko)
NL (1) NL68156C (ko)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011943A (en) * 1933-01-26 1935-08-20 Rca Corp Ultra short wave reception
US2211003A (en) * 1938-01-29 1940-08-13 Rca Corp Radio signaling system
US2260844A (en) * 1940-03-12 1941-10-28 Gen Electric Ultra high frequency converter
US2307074A (en) * 1938-09-22 1943-01-05 George E Pray Modulating circuit for high frequencies
US2382693A (en) * 1940-02-24 1945-08-14 Dallenbach Walter Oscillator-modulator circuit
US2427241A (en) * 1941-05-19 1947-09-09 Hartford Nat Bank & Trust Co Push-pull circuit arrangement for ultra-short waves
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2011943A (en) * 1933-01-26 1935-08-20 Rca Corp Ultra short wave reception
US2211003A (en) * 1938-01-29 1940-08-13 Rca Corp Radio signaling system
US2307074A (en) * 1938-09-22 1943-01-05 George E Pray Modulating circuit for high frequencies
US2382693A (en) * 1940-02-24 1945-08-14 Dallenbach Walter Oscillator-modulator circuit
US2260844A (en) * 1940-03-12 1941-10-28 Gen Electric Ultra high frequency converter
US2427241A (en) * 1941-05-19 1947-09-09 Hartford Nat Bank & Trust Co Push-pull circuit arrangement for ultra-short waves
US2479537A (en) * 1942-12-30 1949-08-16 Gen Electric Detector-oscillator circuit for ultra high frequency receivers

Also Published As

Publication number Publication date
FR920715A (fr) 1947-04-16
CH250225A (de) 1947-08-15
BE459216A (ko) 1946-01-05
NL68156C (ko) 1951-07-16
GB638004A (en) 1950-05-31
DE862028C (de) 1953-01-08

Similar Documents

Publication Publication Date Title
US2296107A (en) Ultra high frequency converter
US1442781A (en) Reamplifying- system
US2441452A (en) Frequency changing circuits
US2662171A (en) Superheterodyne receiving arrangement for use at ultrashort waves
US2606283A (en) Mixing circuit arrangement
US2486076A (en) Circuit arrangement for changing the frequency of electrical oscillations
US2692919A (en) Stabilized driven grounded grid amplifier circuits
US2479537A (en) Detector-oscillator circuit for ultra high frequency receivers
US2505655A (en) Transmitting-receiving circuit arrangement for short waves
US2516990A (en) Ultra high frequency mixer circuits
US2595997A (en) Receiver for short waves
US2538715A (en) Push-pull mixing circuit arrangement
US2266197A (en) Wide frequency band amplifier system
US2434474A (en) Circuit arrangement for ultra short waves
US2312783A (en) Frequency variation response circuit
US2151814A (en) Superheterodyne receiving circuits
US2256067A (en) Receiver selectivity control
US2798158A (en) Tunable high frequency oscillator circuit
US2812433A (en) Plural band frequency converter with intermediate frequency trapping means
US2591982A (en) Superheterodyne receiver for very short waves
US2038285A (en) Parallel push-pull converter circuits
US2093416A (en) Feedback circuits
US2582726A (en) Mixing circuit arrangement
US2835797A (en) Circuit-arrangement for frequencytransformation of oscillations of very high frequency
US2554107A (en) Push-pull mixing circuit