US2280187A - Carrier-signal receiver - Google Patents

Carrier-signal receiver Download PDF

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Publication number
US2280187A
US2280187A US344648A US34464840A US2280187A US 2280187 A US2280187 A US 2280187A US 344648 A US344648 A US 344648A US 34464840 A US34464840 A US 34464840A US 2280187 A US2280187 A US 2280187A
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US
United States
Prior art keywords
signal
carrier
channel
carrier signals
amplitude
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
US344648A
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English (en)
Inventor
Nelson P Case
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.)
BAE Systems Aerospace Inc
Original Assignee
Hazeltine 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 BE441880D priority Critical patent/BE441880A/xx
Application filed by Hazeltine Corp filed Critical Hazeltine Corp
Priority to US344648A priority patent/US2280187A/en
Priority to FR873165D priority patent/FR873165A/fr
Priority to GB8171/41A priority patent/GB549465A/en
Application granted granted Critical
Publication of US2280187A publication Critical patent/US2280187A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers

Definitions

  • One of the problems in carrier-signal communication has concerned the selectivity of the carrier-signal receiver; that is, the ability of th receiver to select a desired carrier signal to the exclusion of undesired carrier signals which may occupy adjacent channels in the frequency spectrum and may have a strength frequently very much greater than that of the desired signal.
  • ,signal receiver tunable over a range'of frequencies comprises a main signal-translating channel adapted to have applied thereto received carrier signals the amplitude of a desired one of which may be less than that of adjacent nudesired carrier signals applied to the channel.
  • An untunable broadly-responsive auxiliary signaltranslating channel is coupled to the main chan-, nel and includes limiting means for limiting to a uniform predetermined amplitude level all received carrier signals in the vicinity oi and including the desired carrier signal.
  • the receiver also includes signal-demodulating means coupled to the main signal channel and means for rendering the demodulating means unresponsive to carrier 618- system l3, l4 and tuned by a tuning condenser l2.
  • signal-demodulating means coupled to the main signal channel and means for rendering the demodulating means unresponsive to carrier 618- system l3, l4 and tuned by a tuning condenser l2.
  • Connected to the output of radio-frequency amplifier I0 is a broad-band radio-frequency amplifier l6 having an input circuit comprising a radio-frequency transformer l6 and tuning condenser H.
  • the radio-frequency amplifier 15 may include one or more stages of amplification and is designed to amplify uniformly signals within a relatively wide range of carrier frequencies applied to the input circuit l6, l1.
  • Fig. 1 is a circuit diagram, partly schematic, of a complete carrier-signal receiver embodying the invention
  • Figs. 2a-2d are graphs representing the strengths of the carrier signals at various points in the receiver of Fig. 1 and are used in explaining the operation of the invention
  • Figs. 3 and 4 are circuit diagrams, partly schematic, of re DCvers incorporating modified embodiments of the invention.
  • the carrier-signal receiver signal-translating means selectively responsive to the desired carrier signal or, in other words, tunable to the frequency of the desired carrier signal, for deriving the desired carrier signal from the auxiliary channel and applying it to the main channel to develop therein a desired carrier signal the amplitude of which is in excess of that of the undesired carrier signals.
  • This means comprises a secondary winding 26 provided in the transformer 25 which is connected in a tunable link circuit comprising winding 26, a winding 21 coupled to the input circuit ll, l2, and a tuning condenser 28.
  • the tuning condensers of the receiver are operated in unison to tune the receiver to a desired carrier signal applied to the input circuit ll, i2 from the antenna-ground system i3, H.
  • the desired carrier signal may have a relatively the amplification of one or both of the units l and I! to maintain the signal input to the detector it within a relatively narrow range for a wide range of received signal intensities.
  • the repeating ratio of the amplifier 2! being sufiicient to amplify the weakest usefulcarrier signal to this predetermined level.
  • the limiter 22 may cause oscillation in the receiving system in the absence of a strong desired signal, although the amount of energy fed back front the limiter 22 to the input circuit II, I! cannot exceed a predetermined value due to the inherent action of the limiter.
  • the radio-frequency amplifier it preferably has little amplification for strong desired signals applied to antenna-ground system i3, ll, in order that the amplified desired carrier fed to theinput circuit i6, I1 of radio-frequency amplifier l5 should not be large compared to the desired carrier component fed to this circuit from the limiter 22 by way of the link circuit 26, 21, 28.
  • the operation of this modification is essentially similar to that of Fig. 1 and will, for that reason, not be repeated.
  • a group of carrier signals having the relative amplitudes represented generally by the vertical lines e"i", inclusive, of Fig. 20.
  • This group of carrier signals is thus coupled by the resistor 33 into the output circuit of the main signal-translating channel, specifically into the detector l8 where the desired carrier signal from the radio-frequency amplifier is reinforced and the reinforced desired carrier signal is demodulated substantially to the exclusion of the undesired carrier signals.
  • the operation of the Fig. 4 embodiment is otherwise similar to that of the Fig. 1 embodiment. From the above description of the Fig.
  • comprise means for rendering the demodulating means or detector l8 unresponsive to carrier signals having an amplitude substantially less than the amplitude of the desired carrier signals developed in the circuit of the detector.
  • comprise signal-translating means sejlectively responsive to the desired carrier signal for deriving the desired carrier signal from the auxiliary signal-translating channel and applying it to the demodulating means or detector Hi to develop therein a desired carrier signal the amplitude of which is in excess of that of the undesired carrier signals.
  • a carrier-signal receiver tunable over a range of frequencies comprising, a main signaltranslating channel adapted to have applied thereto desired carrier signals of a predetermined frequency and undesired carrier signals of different frequency, an untunable broadly-responsive auxiliary signal-translating channel coupled to said main channel and including limiting means for limiting to a uniform predetermined amplitude level all received carrier signals in the vicinity of and including the desired carrier signal, and signal-translating means tunable to said predetermined frequency for deriving said desired carrier signal from said auxiliary channel and selectively applying it to said main channel to develop therein a desired carrier signal the amplitude of which is in excess of that of said undesired carrier signals.
  • a carrier-signal receiver tunable over a range of frequencies comprising, a main signaltranslating channel including a carrier-signal amplifier having an output circuit and having an input circuit adapted to have applied thereto received carrier signals the amplitude of a desired one of which may be less than that of adjacent undesired carrier signals applied to said amplifier, an untunable broadly-responsive auxiliary signal-translating channel coupled to said input circuit and including limiting means for limiting to auniform predetermined amplitude level all received carrier signals in the vicinity of and including the desired carrier signal, and
  • a carrier-signal receiver tunable over a range of frequencies comprising, a main signaltranslating channel adapted to have applied thereto received carriersignals the amplitude of a desired one of which may be less than that of adjacent undesired carrier signals applied to said channel, an auxiliary signal-translating channel coupled to said main channel and including limiting means for limiting to a uniform predetermined amplitude level all received carrier signals in the vicinity of and including the desired carrier signal, signal-demodulating means coupled to channel, an untunable broadly-responsive auxiliary signal translating channel coupled to said main channel and includinglimiting means for limiting to a uniform predetermined amplitude 'level all received carrier signals in the vicinity of and including the desired carrier signal, signaldesired carrier signal for deriving said desired carrier signal from said auxiliary channel and applying it to said main channel to develop therein a desired carrier signal the amplitude of which is in excess of that of said undesired carrier signals, signal-demodulatingmeans coupled to said main channel, and means for rendering said demcdulating means un

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuits Of Receivers In General (AREA)
  • Superheterodyne Receivers (AREA)
  • Radio Relay Systems (AREA)
US344648A 1940-07-10 1940-07-10 Carrier-signal receiver Expired - Lifetime US2280187A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE441880D BE441880A (enrdf_load_stackoverflow) 1940-07-10
US344648A US2280187A (en) 1940-07-10 1940-07-10 Carrier-signal receiver
FR873165D FR873165A (fr) 1940-07-10 1941-06-18 Disposition pour la réception sélective de signaux de haute fréquence
GB8171/41A GB549465A (en) 1940-07-10 1941-06-28 Improvements in carrier-signal receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US344648A US2280187A (en) 1940-07-10 1940-07-10 Carrier-signal receiver

Publications (1)

Publication Number Publication Date
US2280187A true US2280187A (en) 1942-04-21

Family

ID=23351390

Family Applications (1)

Application Number Title Priority Date Filing Date
US344648A Expired - Lifetime US2280187A (en) 1940-07-10 1940-07-10 Carrier-signal receiver

Country Status (4)

Country Link
US (1) US2280187A (enrdf_load_stackoverflow)
BE (1) BE441880A (enrdf_load_stackoverflow)
FR (1) FR873165A (enrdf_load_stackoverflow)
GB (1) GB549465A (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738380A (en) * 1950-02-07 1956-03-13 Murray G Crosby Exalted-carrier television receiver
US2861180A (en) * 1955-05-02 1958-11-18 Rca Corp Detector for vestigial sideband signals
US2987617A (en) * 1956-10-19 1961-06-06 Hazeltine Research Inc Apparatus for converting a vestigialside-band carrier to a double-sideband carrier
US5361405A (en) * 1989-09-14 1994-11-01 Ramsey Electronics, Inc. Aircraft band radio receiver which does not radiate interfering signals

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2738380A (en) * 1950-02-07 1956-03-13 Murray G Crosby Exalted-carrier television receiver
US2861180A (en) * 1955-05-02 1958-11-18 Rca Corp Detector for vestigial sideband signals
US2987617A (en) * 1956-10-19 1961-06-06 Hazeltine Research Inc Apparatus for converting a vestigialside-band carrier to a double-sideband carrier
US5361405A (en) * 1989-09-14 1994-11-01 Ramsey Electronics, Inc. Aircraft band radio receiver which does not radiate interfering signals

Also Published As

Publication number Publication date
FR873165A (fr) 1942-07-01
BE441880A (enrdf_load_stackoverflow)
GB549465A (en) 1942-11-23

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