US1997393A - Autodyne circuit - Google Patents

Autodyne circuit Download PDF

Info

Publication number
US1997393A
US1997393A US424792A US42479230A US1997393A US 1997393 A US1997393 A US 1997393A US 424792 A US424792 A US 424792A US 42479230 A US42479230 A US 42479230A US 1997393 A US1997393 A US 1997393A
Authority
US
United States
Prior art keywords
circuit
circuits
oscillation
energy
input
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
US424792A
Other languages
English (en)
Inventor
Walter Van B Roberts
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.)
RCA Corp
Original Assignee
RCA Corp
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
Priority to NL31542D priority Critical patent/NL31542C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US424792A priority patent/US1997393A/en
Priority to GB3345/31A priority patent/GB360289A/en
Application granted granted Critical
Publication of US1997393A publication Critical patent/US1997393A/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
    • H03D7/06—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
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers

Definitions

  • WALTER VAN B ROBERTS ATTORN EY ⁇ Patented pr. 9, 1935 ⁇ flssmssa'? c tion of Delawarev p A Y" 14' claims; Mir presen'tfinvention relatesto heterodifne systems, andi-more particularly. to -a superheterodyne receiver'v employing-an autodvlne circuit.
  • Another important objectofthe invention ⁇ is to provideA a" heterodyne circuit employingthel 40 autodyne principle, and means zfor ⁇ preventing radiation from the anten'r-1a ⁇ 'by4 the tunedlocaloscillation' circuit, tliem'eansincluding.
  • the circuit shown in ⁇ Fig. 1 is operated by tunquency, and tuning the local oscillation circuit O to a frequency which will heterodyne with the is connected in serieswith condensenor tube :signal frequencyr to produce a difference fre- ⁇ quency equal to the frequency to which the intermediate frequency amplifier is tuned.
  • tunquency and tuning the local oscillation circuit O to a frequency which will heterodyne with the is connected in serieswith condensenor tube :signal frequencyr to produce a difference fre- ⁇ quency equal to the frequency to which the intermediate frequency amplifier is tuned.
  • the vvariable condensers land 3V can be arranged in gang construction ina bathtub housing for shielding purposes, and the rotors of thetwo condensers mounted on a common actuating shaftv for uni-control.
  • one of theadvantagesto bese-j'- curedby ysuch construction is not only the simultaneous tuning of the two circuits, but the fact that the rotors of each of the condensers may beso relatively shaped that ⁇ a constant frequency 1 difference maybe maintained between the two circuits which yis equal ⁇ to the Aintermediate frequency being employed.
  • Fig. 2 By designingr and arranging the circuit as shown in Fig. 2, :this disadvantagemay be effectively eliminated.
  • the signal circuit includes lthe, variable condenser, ⁇ I D and a coil L connectedacross the Variable condenser Condenser K, shunted by a high resistance R,
  • the local oscillation circuit O which includes the ⁇ inductance 2 and the variable condenser 3,v iis connected in series with a coil N, the latter being coupled at M to the coil L.
  • the biasing condenser B is connected Yin series between the control electrode of tube l and the coil N.
  • anode of the tube is energized from ksource B Y through the primary 6 of the Ytransformer M' the primary being shunted by the condenser 8, the
  • an electron Adischarge device having an output circuit and an input circuitsaid input circuit being electrically connected toan antenna system, an oscillation circuit connected in said input circuit adapted to be tuned to the frequency of the desired incoming carrier energy, asecondoscillation circuit, means for connecting said circuit in said input circuit,
  • said input circuit thereof being linked with said output circuit to facilitate the transfer of energy from said output circuit to said input circuit q thereof for producing oscillations, a tuned cir- '4 cuit for controlling the frequency of said oscillations connected in said input circuit, a second tuned circuit tuned to a different frequency than said first named tuned circuit also connected in said input circuit and means for eliminating couping between said two oscillating circuits through transferred thereto-,from'saidsecond namedtun d;
  • theinherentl capacity thi-gspacedischarge--de#- vi'ce comprising 'a link circuiti coupled' to the sec ondinamedituned circuit and/*connected 'in ⁇ series-- with the first namedjitunedf 'circ-uit across thefirr- 1 putof'the Vspace discharge device-for-oppos other' through ⁇ the -said inherent capacity ⁇ of the] space discharge- 4device ⁇ whereby 'said two ⁇ tunedci'rcuits maybe operated atr very nearlyfthe'-same'" ⁇ from oneitothe other; u I
  • electron discharge deviceA having an input circuitl adaptedto be "electricallyr connected t'ojan ⁇ anv tenna system, an output circuitf, saidiput cir.- cuit being linked with saidoutputlcircuitto facili itate the transfer. of energy, from.; said output circuit to saidinpu't circuitiforproducing oscilf' lations, ⁇ atuned circuitfinfsaidfinput circuit for controlling vthe frequency rof said last-named oscillations, a. second tunedcircuit in fsaidiinput circuit tuned" to the frequencyof the carrier'enf ⁇ ergy, electrical coupling between said.' tWotuned circuits including the naturaljcapacity inherent between various elements of A the space discharge;v
  • the terminals-l of said seccnd" ⁇ named tuned circuit asrespects itswconnectionf inY ther-input: ⁇ circuit of said space discharge device-r at the same "potential as oneterminal ofthe-'firstl nanre'd tuned circuitwhereby.V the -rotorslA of i said two condensers faremaintained at the same poeVV tential and a uni-control ⁇ means for varying-said twoicondensers simultaneously?. ⁇
  • the movable-'elements' of said tuning means may be: ⁇ connected together by a vcom-'mon operating means, coupling between said circuits including the natural capacity-'inherent between different portions ofv said- ⁇ system, said-*circuits being traversed bycurrentsof suchhighfre'- quency as to make appreciable ⁇ the inherentcouf pling between them ⁇ and through ⁇ which "coupling energyfrom ,one -ofsaidl ⁇ oscillation circuits may be transferred to ythe ⁇ other thereof-,f means Y-for connecting the otherternnnals--of-f said*A oscilla@ ⁇ tion*circuits;said'lastlnamedfmeansf-includirlg-)a device, for impressing energyfrom one oscillation circuit to the other of phase and amplitude tooppose the energy
  • tuning condensers for said oscillation circuits each thereof coin,-v
  • a heterodynereceiver comprising an antenna, a frequency changing tube, a resonant signal circuit between the antenna and tube inputv including a Variable condenser, a local oscillation resonant circuit coupled to thetube vand including a variable condenser, said two resonant circuits having inherent coupling between them through which' inherent coupling, energy in one circuit is transferred to the other circuit, energy transfer means including a coupling coil between the local and signal circuits for transferring energy from one ⁇ circuit to the other in a sense to oppose the effect of ⁇ the, renergy transferred through the inherenticoupling between the two resonant circuits whereby said two circuits may be made resonant to frequencies'diifering from each other only by Asmall amounts, and means for maintainingoone ⁇ terminal of onel of said condensersat the same fixed potential as a terminal of the other condenser.
  • a frequency chang- Leemans ⁇ ing tube having input and output circuits, said input circuit including a resonant'signal circuit having a variable tuning means adapted to tune said resonant circuit toany one of a plurality of signal frequencies within a predetermined band, ⁇
  • a frequency changer circuit including an electronic tube provided with input and output circuits, a resonant signal circuit in ysaid input circuit said resonant', signal circuit including a variable condenser, a second resonant circuit inthe input circuit of vsaid tube said second circuit including a variable condenser fortuning the circuit to the heterodyning frequency, said two r,resonant cir- ⁇ cuits having inherent coupling between them ⁇ through which coupling energy in one circuit is ⁇ transferred to the other circuit, ,coupling means .between said two resonant circuits for transferring energy from one circuit tol the other in ⁇ a j sense to oppose the ⁇ effect of the energy transferred through said inherent coupling to thereby permit said two resonant circuits to be made resonant to frequencies differing from each other only by small amounts said condensers being arranged so that ⁇ oneterminal of one and one terminal lof the ⁇ other

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Circuits Of Receivers In General (AREA)
US424792A 1930-01-31 1930-01-31 Autodyne circuit Expired - Lifetime US1997393A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL31542D NL31542C (enrdf_load_stackoverflow) 1930-01-31
US424792A US1997393A (en) 1930-01-31 1930-01-31 Autodyne circuit
GB3345/31A GB360289A (en) 1930-01-31 1931-02-02 Improvements in or relating to heterodyne systems suitable for use in wireless reception

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US424792A US1997393A (en) 1930-01-31 1930-01-31 Autodyne circuit

Publications (1)

Publication Number Publication Date
US1997393A true US1997393A (en) 1935-04-09

Family

ID=23683887

Family Applications (1)

Application Number Title Priority Date Filing Date
US424792A Expired - Lifetime US1997393A (en) 1930-01-31 1930-01-31 Autodyne circuit

Country Status (3)

Country Link
US (1) US1997393A (enrdf_load_stackoverflow)
GB (1) GB360289A (enrdf_load_stackoverflow)
NL (1) NL31542C (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432183A (en) * 1940-09-11 1947-12-09 Hartford Nat Bank & Trust Co Frequency converter system
US2581177A (en) * 1948-05-11 1952-01-01 Gen Electric Frequency conversion system for superheterodyne radio receivers
US2631229A (en) * 1949-08-05 1953-03-10 Frank O Chesus Oscillator-mixer circuit with single triode tube
US2737580A (en) * 1949-02-16 1956-03-06 Hartford Nat Bank & Trust Co Mixing circuit for superheterodyne receivers
US2757287A (en) * 1953-07-17 1956-07-31 Rca Corp Stabilized semi-conductor oscillator circuit
US2808505A (en) * 1953-01-12 1957-10-01 Telefunken Gmbh Constant-gain amplifier system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1001350B (de) * 1952-05-23 1957-01-24 Telefunken Gmbh Schaltungsanordnung zur Verminderung der Ausstrahlung von Oszillatorschwingungen, insbesondere beim Ultrakurzwellen-Empfang

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432183A (en) * 1940-09-11 1947-12-09 Hartford Nat Bank & Trust Co Frequency converter system
US2581177A (en) * 1948-05-11 1952-01-01 Gen Electric Frequency conversion system for superheterodyne radio receivers
US2737580A (en) * 1949-02-16 1956-03-06 Hartford Nat Bank & Trust Co Mixing circuit for superheterodyne receivers
US2631229A (en) * 1949-08-05 1953-03-10 Frank O Chesus Oscillator-mixer circuit with single triode tube
US2808505A (en) * 1953-01-12 1957-10-01 Telefunken Gmbh Constant-gain amplifier system
US2757287A (en) * 1953-07-17 1956-07-31 Rca Corp Stabilized semi-conductor oscillator circuit

Also Published As

Publication number Publication date
NL31542C (enrdf_load_stackoverflow) 1900-01-01
GB360289A (en) 1931-11-05

Similar Documents

Publication Publication Date Title
US2419593A (en) Two-way radio communication system
US1997393A (en) Autodyne circuit
US2699494A (en) Suppressed carrier single side band radio transmission system
US1993395A (en) Signal generator
US2206072A (en) Arrangement for mixing two frequencies in a superheterodyne receiver
US2088432A (en) Frequency converter circuit
US2113419A (en) Radio system
US2580051A (en) Frequency converter and oscillator circuit
US2662171A (en) Superheterodyne receiving arrangement for use at ultrashort waves
US2280521A (en) Radio receiver
US1805918A (en) Oscillation generation
US2100605A (en) Radio receiving system
US1850831A (en) Selective radioreceiver
US1819299A (en) Tuning system
US2525053A (en) Multirange oscillator circuits
US2653315A (en) Frequency control system for microwave relay terminal stations
US1735134A (en) Method and system for constant-frequency beat reception of radiosignals
US2286997A (en) Frequency modulation converter
US1915578A (en) Means for eliminating fading
US2123221A (en) Radio circuit for channel reception
US2066940A (en) Radio receiving system
US2431212A (en) Two-way radio system
US2031130A (en) Short wave-long wave receiver
US1621992A (en) Valve generator arrangement
US2080128A (en) High frequency superheterodyne receiver