US2483314A - Superheterodyne receiver comprising automatic frequency control - Google Patents
Superheterodyne receiver comprising automatic frequency control Download PDFInfo
- Publication number
- US2483314A US2483314A US661522A US66152246A US2483314A US 2483314 A US2483314 A US 2483314A US 661522 A US661522 A US 661522A US 66152246 A US66152246 A US 66152246A US 2483314 A US2483314 A US 2483314A
- Authority
- US
- United States
- Prior art keywords
- frequency
- circuit
- carrier
- filter
- amplifier
- 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
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/042—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant with reactance tube
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/14—Controlling the magnetic state of inductor cores
-
- 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
- H04B1/30—Circuits for homodyne or synchrodyne receivers
-
- 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
- H04B1/30—Circuits for homodyne or synchrodyne receivers
- H04B1/302—Circuits for homodyne or synchrodyne receivers for single sideband receivers
Definitions
- the invention relates tol improvements in. or
- the said: specification relates to. a. super heterodyne receiver whose intermediate frequencypartcomprisesa sharpfilter for the:selec- 51011201 the carrier wave; in; which .a control voltagefonautomatic frequency-control is generated with. the aid ofa frequency discriminator of.
- The; filter may comprise one:v
- a filter comprising. one or: more.
- The; objectcf the present invention is. to.-provid'e; an, especially suitable form of. construction of; the receiver above described which: ensuresanrin proved .1 performance.
- the-said frequency discriminatorisccnstructedvin such manner. that'- the ;automatic;frequency-control occurs: solely or substantially. solely as; a. function of" the detuning Ofr the filter' with respect toi the carrier wave;
- The: said; frequency discriminator is; usually". constructed. in; such-v manner that:- the carrien 55 661,523 ,1 filed April.
- phase andin antiphasezytm a couple, of :pushpull connected COHtIYOIEI'GCtifiEIS and which, if.-
- the tuning of thefilteris correct, have. a given phase displacement which will be referred tohereinafter as: the normal phase. displacementand which is'usuallyz909.
- the discriminator network in additionatothe filter whose tuning'is controlled comprises-zone; orrmore uncontrolled resonant circuits", the-phase displacement,
- intermediate frequency circuits of. the. network have suchaqua'lity for the frequency of the intermediate frequency; carrier wave that they do not cause .a relativephase. displacement between. the voltages applied to the controlnrectifiersing phase and in antiphase-respectively; Ifthis cone dition is satisfied, thesecircuits nolonger infiuence the value. of the control voltage-so thatv the automatic frequency-control merely depends upon the'detuning of the filter-with::respect-to the carrier wave.
- the single-figureof the drawing represents the, intermediate frequency portion: of a: receiver towhich the invention is applied.
- Anintermediate frequency amplifying tube 1- is coupled; to" the control grid circuit of a discharge tube. l via a: resonant circuit. 2 tuned ,torthezzintermediate ire-- quencyand a filter 3 formed by; a resonant; cir-- cuit with regenerative-feedback.
- The: filter" 3 is
- the anode circuit of the discharge tube t includes a circuit 9 tuned to the intermediate-frequency and coupled capacitatively via a condenser lll to a diode-detector 1 whose audio-frequency output voltage is supplied to an audiofrequency amplifier (not shown).
- the circuit 2 has connected to it a circuit l2 which is also tuned to the intermediate-frequency and which has connected to it two push-pull connected control rectifiers (diodes) l3 and M.
- the centre of the circuit l2 and the centre of the output resistance it of the two diodes l3 and M are connected to a coupling coil [6 which is coupled inductively to the intermediate-frequency circuit 9.
- the circuits 1, 9 and i2 and the coupling coil H5 constitute a discriminator network which jointly with the control rectifiers l3 and 14 connected to it constitutes a device for generating a control voltage for automatic frequency-control, said control voltage being set up across the said output resistance l5.
- the control voltage is supplied to the control-grid of a discharge tube ll shown in the drawing as a triode, whose anode current is passed through a magnetising coil 8.
- the inductance 6 is provided with a core of high-frequency iron on which the magnetising coil I8 is fitted. Variation of the direct current passing through this coil permits of varying the inductance of the coil 6 and hence the tuning of the sharp circuit 3 within certain limits.
- the sideband frequencies of the intermediate-frequency signal are strongly attenuated with respect to the carrier wave, so that the risk of an apparent over-modulation of the signal occurring in the event of selective fading, which would be accompanied by a Strong non-linear distortion of the low-frequency signal, is avoided.
- the linear distortion brought about by the attenuation of the sideband frequencies is elminated by a suitable choice of the frequency characteristic curve of the audio-frequency amplifier.
- the desired operation requires that the tuning frequency of the circuit 3 always corresponds within narrow limits with the frequency of the intermediate-frequency carrier wave.
- This conformity is ensured by the automatic frequency-control, since, in the event of a divergence occurring between the said frequencies a control 6 voltage of proper polarity is generated across the resistance and modifies the inductance of the coil 6, to such an extent that the tuning frequency of the circuit 3 is again substantially put into agreement with the carrier wave frequency.
- the frequency-control should depend solely or substantially solely upon the detuning of the circuit 3 with respect to the carrier wave and should not depend at the same time upon the frequency difference between the carrier wave and the tuning of the uncontrolled intermediate-frequency circuits 9 and I2.
- the circuits 9 and [2 are constructed in such manner 7 that their quality factor is identical or substantially identical for the frequency of the intermediate-frequency carrier wave.
- the two circuits are of equal quality, they cause no relative phase displacement between the voltages supplied to the control rectifiers in phase and in antiphase respectively and consequently the output resistance I5 has occurring across it a control voltage which depends solely upon the phase displacement caused by the detuning of the circuit 3 with respect to the carrier wave, since the phase displacements occurring by reason of the frequency difference between the carrier wave and the tuning of the circuits 9 and 12, are identical and hence do not contribute towards a relative phase displacement between the said voltages.
- An amplifier circuit arrangement particularly for use in a receiver for receiving signal voltages of carrier and sideband frequencies, comprising an amplifier having an input circuit and an output circuit for translating a first signal voltage having frequency components corresponding to said carrier and said sideband frequencies, a filter circuit sharply tuned to a frequency corresponding to said carrier frequency and coupled to the input circuit of said amplifier to apply a signal voltage of frequency corresponding to said carrier and sideband frequencies to said amplifier, means to couple said filter circuit to said amplifier to derive and apply to the input circuit of said amplifier a second signal voltage of frequency corresponding to said carrier frequency to reduce the damping of said filter, a frequency discriminator circuit having a first resonant circuit coupled to the input circuit and a second resonant circuit coupled to the output circuit of said amplifier to produce a frequency control voltage, means responsive to said control voltage to tune said filter sharply to an intermediate frequency corresponding to said carrier frequency, said first and said second resonant circuits having quality factors such that said frequency control voltage varies substantially solely proportional to the difference in frequency between the frequency to which said filter
- An amplifier circuit arrangement particularly for use in a receiver for receiving signal voltages of carrier and sideband frequencies, comprising an amplifier having an input circuit and an output circuit for translating a first signal voltage having frequency components corresponding to said carrier and said sideband frequencies, a filter circuit sharply tuned to a frequency corresponding to said carrier frequency and coupled to the input circuit of said amplifier to apply a signal voltage of frequency corresponding to said carrier and sideband frequencies to said amplifier, means to couple said filter circuit to said amplifier to derive and apply to the input circuit of said amplifier a second signal voltage of frequency corresponding to said carrier frequency to reduce the damping of said filter, a frequency discriminator circuit having a first resonant circuit coupled to the input circuit and a second resonant circuit coupled to the output circuit of said amplifier to produce a frequency control voltage, means responsive to said control voltage to tune said filter sharply to an intermediate frequency corresponding to said carrier frequency, said first and said second resonant circuits having substantially equal quality factors whereby said frequency control voltage varies substantially solely proportional to the difference in frequency between the frequency to which
- An amplifier circuit arrangement particularly for use in a receiver for receiving signal voltages of carrier and sideband frequencies, comprising an amplifier having an input circuit and an output circuit for translating a first signal voltage having frequency components corresponding to said carrier and said sideband frequencies, a filter circuit sharply tuned to a frequency corresponding to said carrier frequency and coupled to the input circuit of said amplifier to apply a signal voltage of frequency corresponding to said carrier and sideband frequencies to said amplifier, means to couple said filter circuit to said amplifier to derive and apply to the input circuit of said amplifier a second signal voltage of frequency corresponding said carrier frequency to reduce the damping of said filter, a frequency discriminator circuit having a first resonant circuit coupled to the input circuit and a second resonant circuit coupled to the output circuit of said amplifier to produce a frequency control voltage, means responsive to said control voltage to tune said filter sharply to an intermediate frequency corresponding to said carrier frequency, said first, said second resonant circuits having quality factors producing substantially equal phase displacements of the voltages there across whereby said frequency control voltage varies only in proportion to the frequency
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Amplifiers (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Networks Using Active Elements (AREA)
- Noise Elimination (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL102584A NL65489C (de) | 1941-08-16 | 1941-08-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2483314A true US2483314A (en) | 1949-09-27 |
Family
ID=40627386
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US661521A Expired - Lifetime US2483889A (en) | 1941-08-16 | 1946-04-12 | Superheterodyne receiver with automatic frequency control |
US661522A Expired - Lifetime US2483314A (en) | 1941-08-16 | 1946-04-12 | Superheterodyne receiver comprising automatic frequency control |
US662963A Expired - Lifetime US2595931A (en) | 1941-08-16 | 1946-04-18 | Superheterodyne receiver with automatic frequency control |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US661521A Expired - Lifetime US2483889A (en) | 1941-08-16 | 1946-04-12 | Superheterodyne receiver with automatic frequency control |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US662963A Expired - Lifetime US2595931A (en) | 1941-08-16 | 1946-04-18 | Superheterodyne receiver with automatic frequency control |
Country Status (7)
Country | Link |
---|---|
US (3) | US2483889A (de) |
BE (1) | BE446845A (de) |
CH (2) | CH231618A (de) |
DE (3) | DE869223C (de) |
FR (3) | FR885191A (de) |
GB (3) | GB616358A (de) |
NL (2) | NL65489C (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2891158A (en) * | 1951-06-30 | 1959-06-16 | Cgs Lab Inc | Ferrite stabilizing system |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2857479A (en) * | 1953-03-20 | 1958-10-21 | Bell Telephone Labor Inc | Distortion reducing tuned amplifier |
US2811639A (en) * | 1953-05-26 | 1957-10-29 | Cgs Lab Inc | Signal generating apparatus |
US2882391A (en) * | 1954-09-07 | 1959-04-14 | Gen Motors Corp | Electric radio tuner |
DE1158128B (de) * | 1959-04-27 | 1963-11-28 | Robertshaw Fulton Controls Co | Empfaenger fuer phasenmodulierte Hochfrequenzschwingungen |
US3676582A (en) * | 1971-03-03 | 1972-07-11 | Gen Electric | Emphasized carrier circuit with integral afc operation |
US5552036A (en) * | 1994-06-01 | 1996-09-03 | Foret; Todd L. | Process for reducing the level of sulfur in a refinery process stream and/or crude oil |
WO2011148803A1 (ja) * | 2010-05-28 | 2011-12-01 | 株式会社村田製作所 | 電力伝送システム |
TWI608694B (zh) * | 2015-05-13 | 2017-12-11 | Fu Tzu Hsu | Static magnetoresistive magnetic amplifying device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1642173A (en) * | 1921-03-16 | 1927-09-13 | Rca Corp | Radio signaling system |
US1681532A (en) * | 1923-07-02 | 1928-08-21 | Western Electric Co | Transmission control |
US2121103A (en) * | 1935-10-17 | 1938-06-21 | Rca Corp | Frequency variation response circuits |
US2302893A (en) * | 1939-09-29 | 1942-11-24 | Rca Corp | Variable inductance arrangement |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB407057A (en) * | 1932-09-09 | 1934-03-09 | James Robinson | Improvements in or relating to selective receivers for wave signals |
US2133849A (en) * | 1934-06-07 | 1938-10-18 | Gen Electric | Means for tuning receiving systems |
GB469077A (en) * | 1936-01-10 | 1937-07-12 | James Robinson | Improvements in or relating to wireless and like receivers |
US2200038A (en) * | 1938-03-19 | 1940-05-07 | Rca Corp | Automatic frequency control circuit |
US2268672A (en) * | 1938-05-24 | 1942-01-06 | Radio Patents Corp | Selective amplifier |
NL63645C (de) * | 1940-02-29 |
-
0
- DE DENDAT878971D patent/DE878971C/de not_active Expired
- BE BE446845D patent/BE446845A/xx unknown
-
1941
- 1941-08-16 NL NL102584A patent/NL65489C/xx active
-
1942
- 1942-08-14 FR FR885191D patent/FR885191A/fr not_active Expired
- 1942-08-14 CH CH231618D patent/CH231618A/de unknown
- 1942-08-14 DE DEN2520D patent/DE869223C/de not_active Expired
-
1944
- 1944-04-07 DE DEN2242A patent/DE889313C/de not_active Expired
- 1944-04-11 FR FR53543D patent/FR53543E/fr not_active Expired
- 1944-04-14 FR FR53545D patent/FR53545E/fr not_active Expired
- 1944-04-14 CH CH256781D patent/CH256781A/de unknown
-
1946
- 1946-03-22 GB GB8921/46A patent/GB616358A/en not_active Expired
- 1946-04-12 US US661521A patent/US2483889A/en not_active Expired - Lifetime
- 1946-04-12 US US661522A patent/US2483314A/en not_active Expired - Lifetime
- 1946-04-18 US US662963A patent/US2595931A/en not_active Expired - Lifetime
- 1946-10-02 GB GB29422/46A patent/GB630692A/en not_active Expired
- 1946-10-02 GB GB29421/46A patent/GB632169A/en not_active Expired
-
1951
- 1951-08-15 NL NL110901A patent/NL70087C/xx active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1642173A (en) * | 1921-03-16 | 1927-09-13 | Rca Corp | Radio signaling system |
US1681532A (en) * | 1923-07-02 | 1928-08-21 | Western Electric Co | Transmission control |
US2121103A (en) * | 1935-10-17 | 1938-06-21 | Rca Corp | Frequency variation response circuits |
US2302893A (en) * | 1939-09-29 | 1942-11-24 | Rca Corp | Variable inductance arrangement |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2891158A (en) * | 1951-06-30 | 1959-06-16 | Cgs Lab Inc | Ferrite stabilizing system |
Also Published As
Publication number | Publication date |
---|---|
FR885191A (fr) | 1943-09-07 |
NL70087C (de) | 1951-08-15 |
US2483889A (en) | 1949-10-04 |
GB616358A (en) | 1949-01-20 |
CH256781A (de) | 1948-08-31 |
US2595931A (en) | 1952-05-06 |
GB630692A (en) | 1949-10-19 |
GB632169A (en) | 1949-11-17 |
BE446845A (de) | |
DE889313C (de) | 1953-09-10 |
FR53543E (fr) | 1946-03-04 |
CH231618A (de) | 1944-03-31 |
FR53545E (fr) | 1946-03-04 |
NL65489C (de) | 1949-06-15 |
DE869223C (de) | 1953-03-02 |
DE878971C (de) | 1953-04-23 |
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