US1853179A - Superheterodyne receiver control - Google Patents

Superheterodyne receiver control Download PDF

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Publication number
US1853179A
US1853179A US408425A US40842529A US1853179A US 1853179 A US1853179 A US 1853179A US 408425 A US408425 A US 408425A US 40842529 A US40842529 A US 40842529A US 1853179 A US1853179 A US 1853179A
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US
United States
Prior art keywords
circuit
frequency
frequencies
currents
phase
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
US408425A
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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 NL36031D priority Critical patent/NL36031C/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US408425A priority patent/US1853179A/en
Priority to GB34992/30A priority patent/GB359760A/en
Application granted granted Critical
Publication of US1853179A publication Critical patent/US1853179A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/14—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles
    • H03D1/16—Demodulation of amplitude-modulated oscillations by means of non-linear elements having more than two poles of discharge tubes
    • 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
    • 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
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies

Definitions

  • My present invention relates to heterodyne receiving systems, and more particularly to an improved type of superheterodyne receiver.
  • the intermediate frequencies employed in a system described in my aforementioned copending application may be conveniently dividedinto three-ranges.
  • the intermediate frequency may be produced as beats between certain pairs of undesired stations.
  • the third possible location "of the v intermediate frequency is above the broadcast range.
  • This location has the'advantage that the local oscillator never operates at any broadcast frequency and hence there is less chance of its possessing interfering radiation 'characteristics.” Again, the separation ofsignals from image frequencyis easily accomplished in this range; It should be observed that with screen grid tubes a high intermediate frequency can be readily amplified, and by employing low loss circuits in suflicient number a good degree of selectivity can be obtained.
  • the present application is directed towards eliminating the sources of interference specified in the aforegoing paragraph.
  • I have discovered a method of, and devised lneans for, obtaining'beat frequencies in a heterodyne system from the interaction of a local oscillator with desired incoming signals, without at the same time producing beat currents between'two or more incoming signal frequencies, thus eliminating interference caused by applying all frequencies (undesired as well as desired stations) simultaneously upon the frequency changer.
  • Another important object of the invention is to provide a method forobtaining beat frequencies from the interaction of a local oscillator with an incoming signal frequency withoutv at the same time producing beat currentsbetween two incoming signal frequencies which consists in collecting one ormore signal frequencies, impressing allthe signal frequencies upon a pair of frequency changer tubes, balancing out beat currents caused by interacting signal frequencies, and cumulating the beat currents caused by the interaction of the signal frequencies and the local heterodyne frequency.
  • a grounded antenna circuit 3 4.
  • the energy collected in the antenna circuit is impressed upon the input terminals of a low pass filter, the latter comprising a plurality of filter sections made up of inductances 1 and capacities 2, and not passing frequencies above the broadcast range.
  • the filter is equipped with terminating resistances R and R at each end, each resistance being connected in shunt with itsadjacent capacity.
  • the resistance R is connected in the antenna circuit, as shown.
  • the output of the filter is connected through a capacity C and a leak R to the midpoint 5 of the inductance 6, the latter being connected in series with the two control electrodes 7, 7 of the space discharge tubes 8, 8'.
  • a variable capacity C, shunted across the inductance 6 determines the tuning of the oscillator circuit.
  • the circuit which includes the tubes 8, 8, the tuned input circuit 6, 6, tickler coils 16, 16 and by-pass condensers 17, 17 is considered the oscillator circuit.
  • the cathodes of the tubes are connected in series through a resistance 9, which is tapped by a grounded slider member P.
  • the resistance 9 is shunted by a series connection of two by-pass capacities 10, 10, the connection between the capacities being grounded.
  • the midpoint connection to the inductance 6 causes the control electrodes 7 and 7 to be energized in opposite phase.
  • the anode circuits of the two tubes are connected differentially with respect to a tank circuit I, the latter including an antiresonant connection of a capacity 11 and an inductance 12, the latter being tapped at midpoint 13 by a lead 14 connected to a source of anode current B.
  • the circuit I is fixedly tuned to the intermediate frequenc being employed.
  • the function ofthe tan circuit I is to balance out energies coming from the tubes in like phase, but to cumulate the desired beats which are in opposite phase.
  • each tube is connected to a point 15, between the capacity 11 and inductance 12 through a coil 16, regeneratively coupled to the inductance 6.
  • Each anodelead to the circuit I is grounded through a high radio frequency by-pass. capacity 17.
  • the inductance 12 is coupled to an inductance 18, thelatter being disposed in the input circuit of the intermediate frequency amplifier J,
  • the inductance 18 being shunted by a capacity i 19 for tuning the circuit J to the intermediate frequency employed.
  • the circuit J may be connected to the usual amplifier, detector and utilization circuits, not shown herein for the sake of sim- 2..
  • the condenser C and grid leak R are provided as a well known means for maintaining bias on the grids, and a resistance K may be inserted between point. 5 and capacity C, if necessary, to prevent parasitic oscillation.
  • the tubes 8 and 8 must be maintainedin proper balance, and slider P is one expedient of adjusting the relative outputs of the two tubes to obtain perfect balance.
  • What I claim is 1.
  • a method for obtainingbeat frequencies from the interaction of local oscillations with an incoming signal frequency without at the same time producing beat currents between two incoming signal frequencies which consists in collecting a plurality of signal frequencies, impressing all the signal frequencies upon a pair of frequency changer tubes, balancing out currents in the outputs of the tubes in like phase, and cumulating desired beat currents in the outputs of the tubes which are in opposite phase.
  • a superheterodyne circuit comprising means for collecting signal energy, a filter circuit for suppressing undesired signal frequencies, a frequency changing circuit for producing beat currents in like phase and opposite phase, and a tank circuit for balancing out the currents in like phase and cumulating the beat currents in opposite phase.
  • a superheterodyne circuit comprising means for collecting signal energy, a filter circuit for suppressing undesired signal frequencies outside the broadcast range, a frequency changing circuit for producing beat currents in like phase and opposite phase, and
  • a tank circuit resonant to a frequency above the broadcast range, for balancing out the currents in like phase and cumulating the beat currents in opposite phase.
  • a superheterodyne circuit comprising means for collecting signal energy, a filter circuit for suppressing undesired signal frequencies, a frequency changing circuit for producing beat currents in like phase and opposite phase, and a. tank circuit for balancing out-the currents in like phase and cumulating thebeat currentsin opposite phase,
  • thefrequency changing circuit including a and the tank pair of tubes between th'e'filter frequencies outside the broadcast range, a frequency changing circuit for producing beat currents in like and unlikephase, and
  • a receiver comprising an aperiodic means for collecting radio frequency energy including broadcast frequencies, means for suppressing frequencies outside the broadcast range, a frequency changing circuit for producing beat currents in like and unlike phase, and an additional circuit for balancing out currents in like phase.
  • a receiver comprising an aperiodic means for collecting radio frequency energy suppressing frequencies outside the broadcast range, a frequency changingcircuit including a pair of space discharge devices, for producing beat currents in like and unlike phase, and an additional circuit for balancing out currents in like phase.
  • a receiver comprising an aperiodic antenna for collecting radio frequency energy including broadcast frequencies, filter means for. suppressing frequencies outside the broadcast range, a frequency changing circuit for producing beat currents in like and unlike phase, and an additional circuit for balancing out currents in like phase.
  • a receiver comprising means for collecting radio frequency energy including broadcast frequencies, means for suppressing frequencies outsidethe broadcast range, a frequency changing circuit for producing beat frequencies outside the broadcast range, a
  • a superheterodyne receiver comprising an aperiodic antenna for collecting radio frequency energy including broadcast frequen-- cies, a frequency changing circuit, including a pair of electron discharge tubes having a common input and output circuit, for producing beat currents in like and unlike phase, and a resonant circuit in the common out-- 4- 1,aas,17o

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Superheterodyne Receivers (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Transmitters (AREA)
US408425A 1929-11-20 1929-11-20 Superheterodyne receiver control Expired - Lifetime US1853179A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL36031D NL36031C (enrdf_load_stackoverflow) 1929-11-20
US408425A US1853179A (en) 1929-11-20 1929-11-20 Superheterodyne receiver control
GB34992/30A GB359760A (en) 1929-11-20 1930-11-20 Improvements in or relating to heterodyne receiving systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US408425A US1853179A (en) 1929-11-20 1929-11-20 Superheterodyne receiver control

Publications (1)

Publication Number Publication Date
US1853179A true US1853179A (en) 1932-04-12

Family

ID=23616240

Family Applications (1)

Application Number Title Priority Date Filing Date
US408425A Expired - Lifetime US1853179A (en) 1929-11-20 1929-11-20 Superheterodyne receiver control

Country Status (3)

Country Link
US (1) US1853179A (enrdf_load_stackoverflow)
GB (1) GB359760A (enrdf_load_stackoverflow)
NL (1) NL36031C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538715A (en) * 1943-10-18 1951-01-16 Hartford Nat Bank & Trust Co Push-pull mixing circuit arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2538715A (en) * 1943-10-18 1951-01-16 Hartford Nat Bank & Trust Co Push-pull mixing circuit arrangement

Also Published As

Publication number Publication date
GB359760A (en) 1931-10-29
NL36031C (enrdf_load_stackoverflow)

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