US2790079A - Multi-channel radio equipment - Google Patents

Multi-channel radio equipment Download PDF

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Publication number
US2790079A
US2790079A US529111A US52911155A US2790079A US 2790079 A US2790079 A US 2790079A US 529111 A US529111 A US 529111A US 52911155 A US52911155 A US 52911155A US 2790079 A US2790079 A US 2790079A
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US
United States
Prior art keywords
frequency
output
crystal
frequencies
mixer
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
US529111A
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English (en)
Inventor
Sven H M Dodington
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.)
TDK Micronas GmbH
International Telephone and Telegraph Corp
Original Assignee
Deutsche ITT Industries GmbH
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 BE552807D priority Critical patent/BE552807A/xx
Priority to FR697545A priority patent/FR1296502A/fr
Application filed by Deutsche ITT Industries GmbH filed Critical Deutsche ITT Industries GmbH
Priority to US529111A priority patent/US2790079A/en
Priority to CH349306D priority patent/CH349306A/de
Priority to FR57585A priority patent/FR78551E/fr
Priority to GB25217/56A priority patent/GB797920A/en
Priority to DEI12078A priority patent/DE1028626B/de
Application granted granted Critical
Publication of US2790079A publication Critical patent/US2790079A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/06—Arrangements for supplying the carrier waves ; Arrangements for supplying synchronisation signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/02—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using radio waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B21/00—Generation of oscillations by combining unmodulated signals of different frequencies
    • H03B21/01—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies
    • H03B21/02—Generation of oscillations by combining unmodulated signals of different frequencies by beating unmodulated signals of different frequencies by plural beating, i.e. for frequency synthesis ; Beating in combination with multiplication or division of frequency
    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication

Definitions

  • This invention relates to multi-channel radio equipment and more particularly to means for generating a plurality of crystal-controlled radio-frequency channels.
  • Another object of this invention is to reduce the band width of multiplier circuits utilized in multi-channel radio equipment in accordance with the principles of this invention.
  • Still another object of this invention is to substantially eliminate spurious frequency responses in the output of this equipment due to frequency generation.
  • One of the features of my inventon is the use of a plurality of crystals which can be selectively coupled to a crystal-controlled oscillator.
  • the output of the oscillator is multiplied in a broadbandmultiplier circuit and nited States Patent 0 coupled as one input to a mixer circuit.
  • a crystal-controlled looal oscillator has its output selectively multiplied, by one of a plurality of integers, in a multiplier circuit whose output is coupled as a second input to the mixer circuit.
  • the output of the mixer circuit is filtered and amplified to provide the radio frequency for each channel.
  • Fig. l is a schematic drawing in block form of a multichannel nadio equipment frequency generator in accordance with the principles of my invention.
  • Fig. 2 is a chart helpful in explaining my invention.
  • a crystal turret 1 containing a plurality of crystals is provided to mechanically couple one of the plurality of crystals in the turret to a crystal-controlled oscillator.
  • the output of the crystal-controlled oscillator will be at a frequency de pendent upon the resonant frequency of the crystal coupled to the crystal turret 1.
  • the output of the crystalcontrolled oscillator is passed through a broadband multiplier 3 whose bandwidth must be sufficiently broad to encompass the resonant frequencies of all the crystals contained in turret 1.
  • the output of the broadband multiplier 3 is coupled as one input to a mixer circuit 4.
  • the 40 me. crystal is coupled to an oscillator whose output is multiplied by 27 in circuit 3 to produce as one input to mixer 4 a signal at 1080 me. If the output of the local oscillator d at 42 me. is coupled to mixer 4-, it is obvious that the output of mixer 4 will contain the 1080 me. signal and the 1080 mc.i42 Inc. produces at the output of the equipment shown in Fig. 1, dependent upon the setting of filter 8 and the tuned circuit of power amplifier 9, three crystal-controlled channel frequencies.
  • Each of the other crystals in the crystal turret will also produce three crystal-controlled frequencies for use in the multi-channel equipment and thus 126 channels can be generated from the 42 crystals in the crystal turret 1 and the single crystal utilized with local oscillator 6. Since each crystal coupled to crystal oscillator 2 can produce three channel frequencies, it is obvious that the filter S and the tuned circuit of power amplifier 9 must be set in one of three positions for each crystal coupled to the oscillator 2. This is accomplished by having gear ratio 12 provided so that for each crystal coupled to the oscillator 2 there are three positions of the frequency sensitive portion contained in filter 8, power amplifier 9.
  • the above system for generating 126 channels is charted on line 1 of Fig. 2 where it is seen that 126 channels require a total of 43 crystals and a multiplier bandwidth of approximately 42 inc. while using a 42 me. local oscillator and a gear ratio of 3.
  • the output of the mixer 4 can be made to contain five frequencies instead of the three frequencies ob tained utilizing only a single frequency for mixing with the output of multiplier 3.
  • the crystal turret 1 must rotate a complete revolution while the multiplier '7 multiplies the output of local oscillator 6 by a single integer and on the next revolution of the crystal turret f the multiplier 7 should multiply the output of the local oscillator 6 by another integer.
  • the tuned cir cuits of mixer 8 and power amplifier 9 must be positioned in one of five positions for each position of the crystal turret 1 and this again is achieved by the use of gear ratio 12.
  • the filterable spurious signal at the output of the mixer 4 differs from the desired frequencies by a factor equal to fznz and, therefore, can be as low as f2 on some channels. It is thus seen that a limit is consequently reached when sufficient selectivity of filter 5 cannot be economically provided.
  • a device for generating a plurality of radio frequencies comprising a plurality of first piezo-electric devices each adapted to resonate at a given frequency, means to generate a first frequency responsive to the given frequency of one of said devices, means to couple a selected one of said plurality of piezo-electric devices to said first frequency generating means, a second piezo-electric device, means to generate a second frequency responsive to said second piezo-electric device, frequency multiplying means to produce in its output the product of said second frequency and a selected one of a plurality of consecutive integers, means to mix the output of said multiplying means with said first frequency to produce at the output of said mixing means a plurality of distinct frequencies and filter means to select one of said plurality of mixer means output frequencies.
  • Multi-crystal control channel radio equipment comprising a plurality of crystals less than the number of channels and each having a different frequency at which it is resonant, means to generate a first frequency responsive to one of said plurality of crystals, means to selectively couple one of said plurality of crystals to said first frequency generating means to produce said first frequency, multiplying means to raise said first frequency to a higher frequency, a second crystal distinct from said plurality of crystals, means to generate a second frequency responsive to said second crystal, means to selectively multiply by one of a plurality of integers the output of said second frequency generating means, said one of the plurality of integers selected responsive to said selective coupling means, means to mix the multiplied output of said first frequency generating means and the output of References Cited in the file of this patent UNITED STATES PATENTS 1,727,575 Trogner Sept. 10, 1929 2,487,857 Davis Nov. 15, 1949 2,501,591 Bach Mar. 21, 1950 2,555,390 Bach June 5, 1951

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Transmitters (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
US529111A 1955-08-15 1955-08-18 Multi-channel radio equipment Expired - Lifetime US2790079A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
BE552807D BE552807A (de) 1955-08-18
FR697545A FR1296502A (fr) 1955-08-15 1955-08-15 Récepteur de radionavigation
US529111A US2790079A (en) 1955-08-18 1955-08-18 Multi-channel radio equipment
CH349306D CH349306A (de) 1955-08-18 1956-08-14 Hochfrequenz-Generator
FR57585A FR78551E (fr) 1955-08-18 1956-08-17 Récepteur de radio-navigation
GB25217/56A GB797920A (en) 1955-08-18 1956-08-17 Multi-channel radio equipment
DEI12078A DE1028626B (de) 1955-08-18 1956-08-18 Schaltungsanordnung zur Erzeugung einer Vielzahl von quarzgenauen, einstellbaren Frequenzen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US529111A US2790079A (en) 1955-08-18 1955-08-18 Multi-channel radio equipment

Publications (1)

Publication Number Publication Date
US2790079A true US2790079A (en) 1957-04-23

Family

ID=24108571

Family Applications (1)

Application Number Title Priority Date Filing Date
US529111A Expired - Lifetime US2790079A (en) 1955-08-15 1955-08-18 Multi-channel radio equipment

Country Status (5)

Country Link
US (1) US2790079A (de)
BE (1) BE552807A (de)
CH (1) CH349306A (de)
DE (1) DE1028626B (de)
GB (1) GB797920A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881321A (en) * 1957-08-30 1959-04-07 Walter J Dauksher Variable frequency crystal controlled oscillator
US3296549A (en) * 1962-11-29 1967-01-03 Einar C Johnson Parallel capacitor controlled variable frequency oscillator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1082632B (de) 1957-02-07 1960-06-02 Bendix Aviat Corp Auf zahlreiche Frequenzkanaele schaltbarer Funksendeempfaenger

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1727575A (en) * 1927-02-15 1929-09-10 Wired Radio Inc Frequency-control system
US2487857A (en) * 1945-11-21 1949-11-15 Collins Radio Co Channelized high-frequency signal receiving system
US2501591A (en) * 1945-08-27 1950-03-21 Premier Crystal Lab Inc Multiband superheterodyne radio receiver having a push-button station selector
US2555390A (en) * 1946-02-18 1951-06-05 Arthur A Glass Audiometer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE501615C (de) * 1928-09-10 1930-07-05 Telefunken Gmbh Verfahren zur Herstellung einer in ihrer Wellenlaenge veraenderlichen Traegerwelle bei kristallgesteuerten Kurzwellensendern und Empfangsanlagen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1727575A (en) * 1927-02-15 1929-09-10 Wired Radio Inc Frequency-control system
US2501591A (en) * 1945-08-27 1950-03-21 Premier Crystal Lab Inc Multiband superheterodyne radio receiver having a push-button station selector
US2487857A (en) * 1945-11-21 1949-11-15 Collins Radio Co Channelized high-frequency signal receiving system
US2555390A (en) * 1946-02-18 1951-06-05 Arthur A Glass Audiometer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881321A (en) * 1957-08-30 1959-04-07 Walter J Dauksher Variable frequency crystal controlled oscillator
US3296549A (en) * 1962-11-29 1967-01-03 Einar C Johnson Parallel capacitor controlled variable frequency oscillator

Also Published As

Publication number Publication date
GB797920A (en) 1958-07-09
BE552807A (de)
CH349306A (de) 1960-10-15
DE1028626B (de) 1958-04-24

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