US2168193A - Multiband receiver - Google Patents

Multiband receiver Download PDF

Info

Publication number
US2168193A
US2168193A US140619A US14061937A US2168193A US 2168193 A US2168193 A US 2168193A US 140619 A US140619 A US 140619A US 14061937 A US14061937 A US 14061937A US 2168193 A US2168193 A US 2168193A
Authority
US
United States
Prior art keywords
frequency
amplifier
receiver
bands
frequency band
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
US140619A
Other languages
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 BE427395D priority Critical patent/BE427395A/xx
Priority to BE427895D priority patent/BE427895A/xx
Priority to NL54188D priority patent/NL54188C/xx
Application filed by Hazeltine Corp filed Critical Hazeltine Corp
Priority to US140619A priority patent/US2168193A/en
Priority to FR837485D priority patent/FR837485A/fr
Application granted granted Critical
Publication of US2168193A publication Critical patent/US2168193A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63F—CARD, BOARD, OR ROULETTE GAMES; INDOOR GAMES USING SMALL MOVING PLAYING BODIES; VIDEO GAMES; GAMES NOT OTHERWISE PROVIDED FOR
    • A63F7/00—Indoor games using small moving playing bodies, e.g. balls, discs or blocks
    • A63F7/06—Games simulating outdoor ball games, e.g. hockey or football
    • A63F7/068—Games simulating outdoor ball games, e.g. hockey or football using magnetic power
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/46—Reflex amplifiers
    • H03F3/48—Reflex amplifiers with tubes only

Definitions

  • This invention relates to multiband modulatedcarrier signal receivers and, more particularly, to such receivers operative over a wide range of radio frequencies and including provisions for procuring an approximately uniform amplification at all frequencies of the range.
  • an automatic amplification control bias is applied to a multielectrode tube used as an oscillator-modulator or frequency changer in such a receiver, such control generally affects to a certain degree the frequency generated by the oscillator, with the result that there is a variation in the oscillation frequency as the amplification control bias varies in response to changes in the amplitude of the received signals. While this variation is only a small percentage of the mean oscillation frequency and, therefore, is not very objectionable when the receiver is operating in a relatively low-frequency band, it becomes particularly objectionable when the receiver is operating in a high-frequency band.
  • the effective range of automatic amplification control for the high-frequency band is considerably greater than for a low-frequency band.
  • a multiband modulated-carrier receiver comprises a carrier-frequency channel followed by a channel operating at a lower carrier frequency, for example, the intermediate frequency of a superheterodyne receiver.
  • a channel operating at a lower carrier frequency for example, the intermediate frequency of a superheterodyne receiver.
  • means for effectively increasing the number of stages, when the receiver is operating in a bandhaving a relatively high mean frequency either by reflexing the output of one of the stages of lower carrier frequency through one or more of the stages of higher carrier frequency or by providing for a dual amplification in one of the stages of lower carrier frequency.
  • Figs. 1 and 2 of the drawings are circuit diagrams, partly schematic, each illustrating an embodiment of the invention as incorporated in a multiband modulated-carrier signal receiver of the superheterodyne type.
  • a circuit diagram of a complete modulated-carrier signal receiver of the superheterodyne type embodying the invention in which certain conventional portions are indicated schematically since, per se, they form no part of the invention.
  • This receiver comprises, in cascade, an antenna circuit '9, a tunable radio-frequency selector 16, a radio-frequency amplifier tube I0, a tunable radio frequency selector H, a frequency 'changeror oscillator-modulator tube ll provided with an oscillationnetwork 23, an intermediatefrequency selector 51, an intermediate-frequency amplifier l2 of one or more stages, a detector and A.
  • V. C. supply l3, an audio-frequency amplifier I4 of one or more stages, and a loudspeaker I 5.
  • the radio-frequency 55 selector I6 comprises a group of primary windings 3
  • radio-frequency selector l1 comprises a group of primary windings 38, 39, and 49 inductively coupled to a group of secondary windings 4
  • Suitable parallel and series-aligning condensers may be provided for the several tunable circuits, as shown, in accordance with conventional practice.
  • the series-aligning condensers of the oscillation network 23 may be common to the oscillator-grid and oscillatoranode circuits of the oscillator-modulator II, as shown, to provide substantially uniform oscillation voltage, in a conventional manner.
  • Suitable operating potentials are supplied to the input electrodes of tubes I0 and II from sources indicated at +3 and +Sc.
  • Automatic amplification control bias derived from the unit I3 is supplied to the tube I9, to the tube I I (in the two lower frequency bands), and to one or more of the tubes in the intermediate-frequency amplifier 12, all in a conventional manner.
  • the output circuit of the oscillator-modulator H is coupled to the intermediate-frequency amplifier l2 through a coupling network 51 comprising a pair of double-tuned intermediate-frequency transformers with windings 54, 58 and 60, 6
  • the transformers 54, 58 and 60, El and their associated windings 59 and 62 are appropriately individually shielded, as indicated.
  • the system described above includes the features of a conventional superheterodyne multiband receiver.
  • a desired modulated-carrier signal intercepted by the antenna 9 is selectively amplified in the radio-frequency selectors I6 and I1 and amplifier l0 and converted in frequency changer H to an intermediate-frequency modulated-carrier signal.
  • This signal is selectively amplified by the intermediate-frequency selector 57 and amplifier l2 and translated therefrom to the detector and A.
  • the audio frequencies of modulation areamplified in the audio-frequency amplifier l4 and reproduced by the loud-speaker IS in a conventional manner.
  • a refiex amplification of the output of frequency changer ll through amplifier tube In is provided in the high-frequency band.
  • a portion of the intermediate-frequency voltage across winding 58 is applied to the input terminals of amplifier in through conductor 61 and through the radiofrequency choke coil .68, as shown in the drawings.
  • the link circuit is opened at switch 26, removing the coupling between transformers 54, 58 and 6
  • the output circuit of amplifier II] in the highfrequency band also includes the primary winding 60 of the intermediate-frequency transformer 69, 6
  • the amplification control bias is applied to both of tubes l0 and II when operating in the lowand middle-frequency bands, it is not applied to oscillator-modulator II in the high-frequency band, thus avoiding the frequency variation of the local oscillations with varying amplification control bias which, as noted above, is particularly seriousin the high-frequency bands.
  • a full equivalent range of control is procured in the high-frequency band, since the amplification of the signal is effectively subject to a double control in amplifier l0 through which the signal passes twice.
  • Fig. 2 of the drawings there is shown another embodiment of the invention applied, as in Fig. 1, to a receiver of the superheterodyne type. Similar elements in the two figures are identified by the same reference numerals.
  • the receiver of Fig. 2 comprises, in cascade, the antenna circuit 9, tunable radio-frequency selectors l6 and 10, a frequency changer or oscillatormodulator H, provided with an oscillation network 23, an intermediate-frequency transformer H, an intermediate-frequency amplifier tube 12, an intermediate-frequency transformer 13, a detector and A. V. C. supply 13, an audio-frequency amplifier I4 of one or more stages, and a loudspeaker 15.
  • the antenna circuit 9 tunable radio-frequency selectors l6 and 10
  • a frequency changer or oscillatormodulator H provided with an oscillation network 23, an intermediate-frequency transformer H, an intermediate-frequency amplifier tube 12, an intermediate-frequency transformer 13, a detector and A. V. C. supply 13, an audio-frequency amplifier I4 of one or more stages, and a loudspeaker 15.
  • switches I9, 20, 24, 25, 75, and 16 are provided, preferably ganged for unicontrol.
  • Selector l6 is coupled to the input circuit of oscillator-modulator ll through switch 15, selector circuit 10 comprising windings I1 and 18 for the lowand middle-frequency bands, respectively, and switch 16.
  • Automatic amplification control bias derived from unit [3 is supplied to the tube l I, only in the two lower frequency bands and to the tube 12 in allbands of receiver operation.
  • the intermediate-frequency output of amplifier 12 is coupled to the detector and A. V. C. supply unit 13 through transformer 13, comprising windings 19, BU'With their associated tuning condensers, in all bands of receiver operation.
  • the system described above includes the features of a conventional superheterodyne multiband receiver.
  • a desired modulated-carrier signal intercepted by antenna 9 is selectively amplified in selectors l6 and 10 and converted in frequency changer I l to an intermediate-frequency modulated-carrier signal.
  • the intermediate-frequency signal is selectively amplified by the transformer N, amplifier 12, and transformer 73 and translated therefrom to detector and A. V. C. supply [3, where the audio frequencies of modulation and the automatic amplification control bias voltage are derived. Beyond this point, the operation is identical with that described in connection with Fig. 1.
  • a dual amplification is effected in amplifier tube 12 in the high-frequency band.
  • the carrier-frequency signals selected by selector IS in the high-frequency band are applied to the grid of tube 12 through the condenser 31.
  • is prevented by the radio-frequency choke coil 68.
  • the amplified carrier-frequency output of amplifier tube 12 is then applied to the input terminals of frequency changer H through the radio-frequency transformer 83, 82, the secondary winding 82 being tuned by tuning condenser 29.
  • the intermediate-frequency output of the frequency changer l l is selectively translated through the intermediate-frequency transformer II and applied to the input terminals of amplifier 12 through the radiofrequency choke 68.
  • the condenser 31 is of relatively low capacitance and serves to prevent the intermediate-frequency currents from draining off to ground through the relatively low-impedance path including winding 36.
  • the A. V. C. bias is not applied to the oscillator-modulator II in the high-frequency band.
  • Full equivalent automatic amplification control is procured in the high-frequency band of Fig. 2, since the signal is effectively subjected to a double amplification in the controlled amplifier tube 12, through which the signal passes twice.
  • a multiband modulated-carrier signal receiver having a plurality of stages and tunable over a high-frequency band and one or more low-frequency bands comprising, a first modulated-carrier-frequency channel, a frequency changer coupled to said channel for changing the carrier derived from said channel to a carrier having a different frequency, said frequency being of a different order of magnitude than that of said first channel in said high-frequency band, a second carrier-frequency channel tuned to the frequency of said second carrier coupled to said frequency changer, an amplifier in one of said channels, an automatic amplification control means connected to a plurality of said receiver stages including said frequency changer and said amplifier, and means for selectively including said amplifier in both of said channels and for simultaneously reducing the effect of said automatic amplification control on said frequency changer for operation in said high-frequency band.
  • a multiband modulated-carrier signal receiver tunable over a high-frequency band and one or more low-frequency bands comprising, a multiband carrier-frequency selector system, an amplifier in said system, a frequency changer coupled to said amplifier, a signal-trantlating stage, first and second intermediate-frequency transformers, a link circuit coupling said transformers, and means for selectivelycoupling the output of said frequency changer to said translating stage, either through said firsttransformer, saidlink circuit and said second transformer and for simultaneously conditioning said selector system for operation in said low-frequency band or bands, or through said first transformer, said amplifier and said second transformer and for simultaneously conditioning said selector system for operation in said high-frequency band.
  • a multiband superheterodyne signal receiver tunable over a high-frequency band and one or more low-frequency bands comprising, a multiband carrier-frequency selector system, an amplifier in said system, a frequency changer coupled to said amplifier, a signal-translating stage, first and second carrier-frequency.
  • selectors means coupling said selectors, a plurality of switch means for selectively conditioning said receiver for operation in any of said bands, switch means for selectively coupling the output of said frequency changer to said translating stage, either through said first selector, said coupling means and said second selector for operation in said low-frequency band or bands, or through said first selector, said amplifier and said second selector for reflex amplification of the intermediate frequency in said high-frequency band, and unicontrol means for operating said switch means.
  • a multiband modulated-carrier signal receiver comprising a plurality of stages and tunable over a high-frequency band and one or more lowfrequency bands comprising, a multiband carrierfrequency selector system, an amplifier in said system, a frequency changer coupled to said amplifier, a signal-translating stage, automatic amplification control means coupled to a plurality of said stages, means for selectively coupling the output of said frequency changer to said signaltranslating stage, either directly and for simultaneously conditioning said selector system for operation in said low-frequency band or bands, or through said amplifier and for simultaneously conditioning said selector system for operation in said high-frequency band, and means effective in said high-frequency band to reduce the effect of said automatic amplification control means on one of the receiver stages without substantially reducing the range of amplification control.
  • a multiband modulated-carrier signal receiver comprising a plurality of stages and tunable over a high-frequency band and one or more low-frequency bands comprising, a multiband carrier-frequency selector system, an amplifier in said system, a frequency changer coupled to said amplifier, a signal-translating stage, automatic amplification control means coupled to a plurality of said stages, a plurality of switch means for selectively conditioning said receiver for operation in any of said bands, switch means for selectively coupling the output of said frequency changer to said translating stage, either directly for operation in said low-frequency band or bands, or through said amplifier for reflex am-- plification in said high-frequency band, switch means to reduce the effect of said automatic amplification control means on one of the receiver stages without substantially reducing the range of amplification control, and unicontrol means for operating all of said switch means.
  • a multiband modulated-carrier signal receiver having a plurality of stages and tunable over a high-frequency band and one or more lowfrequency bands comprising, a multiband carrier-frequency selector system, an amplifier in said system, a frequency changer coupled to said amplifierfa signal-translating stage, automatic amplification control means coupled to a plurality of the receiver stages including said frequency changer, means for selectively coupling the output of said frequency changer to said signal-translating stage, either directly and for sifrequency selector system,an amplifier in said system, a frequencychanger coupled to said amplifier, a signal-translating stage, a plurality of switch means for selectively conditioning said re-.,
  • automatic amplification control means coupled to a plurality of the receiver stages including said fre quency changer, switch means for selectively coupling the output of said frequency changer to said signal-translating stage, either directly and for simultaneously conditioning said selector system for operation in said low-frequency band or bands, or through, said amplifier and for simultaneously
  • a multiband modulated-carrier signal receiver having a plurality of stages and tunable over a high-frequency band and one or more lowfrequency bands comprising, a multiband carrier-frequency selector system, a frequency changer comprising output terminals, a signaltranslating channel coupled to said output terminals, an amplifier in said signal-translating channel, automatic amplification control means coupled to a plurality of the receiver stages including said frequency changer and said amplifier, means for selectivelyincluding said amplifier in both of said channels and for simultaneously conditioning said selector system for operation in said high-frequency band, and means effective to reduce the effect of said amplification control on said frequency changer when operating in said high-frequency band.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Superheterodyne Receivers (AREA)
US140619A 1937-05-04 1937-05-04 Multiband receiver Expired - Lifetime US2168193A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE427395D BE427395A (xx) 1937-05-04
BE427895D BE427895A (xx) 1937-05-04
NL54188D NL54188C (xx) 1937-05-04
US140619A US2168193A (en) 1937-05-04 1937-05-04 Multiband receiver
FR837485D FR837485A (fr) 1937-05-04 1938-05-03 Disposition de réception de signaux porteurs modulés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US140619A US2168193A (en) 1937-05-04 1937-05-04 Multiband receiver

Publications (1)

Publication Number Publication Date
US2168193A true US2168193A (en) 1939-08-01

Family

ID=22492057

Family Applications (1)

Application Number Title Priority Date Filing Date
US140619A Expired - Lifetime US2168193A (en) 1937-05-04 1937-05-04 Multiband receiver

Country Status (4)

Country Link
US (1) US2168193A (xx)
BE (2) BE427895A (xx)
FR (1) FR837485A (xx)
NL (1) NL54188C (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636078A (en) * 1945-04-03 1953-04-21 Jr Lynn W Marsh Ring circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636078A (en) * 1945-04-03 1953-04-21 Jr Lynn W Marsh Ring circuit

Also Published As

Publication number Publication date
BE427895A (xx)
FR837485A (fr) 1939-02-10
NL54188C (xx)
BE427395A (xx)

Similar Documents

Publication Publication Date Title
US2581159A (en) Tunable band pass amplifier for television
US2486076A (en) Circuit arrangement for changing the frequency of electrical oscillations
US2168193A (en) Multiband receiver
US2148633A (en) Tuning and selectivity control
US1905946A (en) Automatic gain control
US2210497A (en) Amplifying system
US2261374A (en) Frequency modulation receiving system
US2075526A (en) Radio signal receiving system
US2026075A (en) Simplified selective circuits
US2169830A (en) Automatic selectivity control
US2080560A (en) Coupling system
US2812433A (en) Plural band frequency converter with intermediate frequency trapping means
US2511327A (en) Band-pass input circuit
US2273134A (en) Dual intermediate frequency amplifier circuit
US2093416A (en) Feedback circuits
US2201365A (en) Duplex vacuum-tube repeater
US2091134A (en) Amplifier
US1944119A (en) Convertible band pass receiver
US2216874A (en) Band-pass selector
US1921088A (en) Wave signaling system
US2707730A (en) Amplifier circuits for television picture signal channels
US1888430A (en) Radio receiving system
US2103079A (en) Wave signaling system
US2022805A (en) Radio receiver
US2223822A (en) Television receiver