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    High stability oscillator
    2.
    发明授权
    High stability oscillator 失效
    高稳定性振荡器

    公开(公告)号：US3581236A

    公开(公告)日：1971-05-25

    申请号：US3581236D

    申请日：1969-01-07

    Applicant: CIT ALCATEL

    Inventor： BERMAN LEON

    IPC: H03L1/02 ,  H03B5/36

    CPC classification number: H03L1/023

    Abstract: A high stability oscillator having an amplifying channel including a phase adjusting member and a separate reaction channel including a resonant crystal and a temperature stabilizing circuit, the phase adjusting member being effective to compensate for aging of the crystal without affecting the temperature stabilization of the oscillator.

    Automatic frequency scanning in a twoway radio communication system
    6.
    发明授权
    Automatic frequency scanning in a twoway radio communication system 失效

    公开(公告)号：US3426279A

    公开(公告)日：1969-02-04

    申请号：US3426279D

    申请日：1966-09-20

    Applicant: CIT ALCATEL

    Inventor： BERMAN LEON

    IPC: H04J3/24 ,  H04W48/16 ,  H04B1/40 ,  H04B1/44 ,  H04L5/00

    CPC classification number: H04W48/16 ,  Y02D70/00

    Abstract: 1,145,899. Combined radio receiving and transmitting systems; radio interconnection systems. CIT - COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 20 Sept., 1966 [21 Sept., 1965], No. 42034/66. Headings H4K and H4L. In a transmitter-receiver radio system using a modulated carrier frequency for two-way communication between any two stations of a group of stations for which there is provided a number of channels in a frequency band, each station comprises a transmitter and a receiver which are both connected to a common variable frequency oscillator which is operable by scanning means to scan across the frequency band. Said scanning means can be disabled by a first switching means, to which either a decoding means or a threshold detector can be connected by a second switching means. When the decoding means is connected to the first switching means scanning is stopped when an identification signal is received, and when the threshold detector is connected to the first switching means scanning is stopped when the absence of carrier signal indicates that a channel is vacant and available. As described, a radio station comprises an aerial 1 which is connected when used for reception through a contact a of a relay 2 to an H.F. amplifier 3, a mixer 4, and an I.F. amplifier and detector 5, the output from which is connected to a threshold detector 6, a decoder 9, and, via a contact p of a relay 13 and an L.F. amplifier 7, to the receiver 26 of a handset 25. The mixer 4 is fed at its other input from a variable-frequency oscillator 8 which is operated by an automatic frequency control circuit 11, providing either continuous or stepby-step variations of frequency, and connected through a contact k of the relay 13. If the system covers the 140-143 Mc/s. band, divided into 100 channels, the oscillator 8 would cover 170-173 Mc/s and the band-width of the amplifier 5 would be 30 Mc/s. On the " transmit " side, a microphone 27 is connected through a contact q of a relay 16 to a modulator 19, having a second input from a fixed frequency (for example, 2 Mc/s.) oscillator 18, whose output is connected to a mixer 21 having a second input from a fixed frequency (for example, 32 Mc/s.) oscillator 20. The output from the mixer 21 is connected through a contact e of the relay 13, to a second mixer 23 having a second input from the variable frequency oscillator 8. The output from the mixer 23, with the same carrier frequency as in the " receive " side, is connected through an amplifier 24 to a contact b of the relay 2. When the handset 25 is " on-hook " a contact t is open, thereby de-energizing a relay 14 and closing a contact c of a make-before-break pair c, d. Power is supplied from a unit 12, which is controlled by the decoder 9, through the contact c to the operating coils of relays 13, 16. The contact k of the relay 13 switches on the circuit 11, and the oscillator 8 begins to scan. The amplifier 7 is disconnected from the output of the amplifier-detector 5 and is earthed through a contact n. A variable encoder 17 is connected through a contact r of the relay 16, in place of the microphone 27. If a call is received, the decoder 9 operates the unit 12, and the relays 13, 16 are deenergized. Scanning stops when the contact k opens and the microphone 27 is connected via the contact q. A signalling lamp 10 lights up as a contact g is closed. To speak, a pressswitch s in the handset is operated which energizes the relay 2, so switching the aerial 1 from contact a on the receive side to contact b on the transmit side. To make a call, the called station's code is set up on the encoder 17. The handset 25 is lifted when the relay 14 is energized via a contact t. The relays 13, 16 remain operated by output from the threshold detector 6, as the contact d makes before the contact c breaks. Scanning continues until a free channel is encountered, when the relay 13 is de-energized as the output from the threshold detector 6 falls. The relay 16 remains energized for a further time by reason of a delay member 15 in circuit with it, and the calling code is transmitted by operating the press switch s.

    7.
    发明专利
    未知

    公开(公告)号：DE1766575A1

    公开(公告)日：1971-07-29

    申请号：DE1766575

    申请日：1968-06-14

    Applicant: CIT ALCATEL

    Inventor： BERMAN LEON

    IPC: H03L7/22 ,  H04J1/06 ,  H03B

    Abstract: 1,160,848. Frequency generators; automatic frequency control. C.I.T. -COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 17 June, 1968 [16 June, 1967], No. 28648/68. Headings H3A and H3F. A frequency synthesizer produces a plurality of different synchronized output frequencies from respective set frequency units 20-60 each of which is capable of being set by means of a general control unit 20 to a desired frequency set up in a frequency selector unit 10 which has controls 12 to select a desired frequency and switching devices 15 for choosing the unit whose output frequency is to be synchronized with the desired frequency. The general control unit 20 provides a spectrum of stabilized frequencies with any of which the chosen set frequency unit may be synchronized, a generator providing an exploratory control voltage to a variable oscillator in the chosen set frequency unit, and a modulating and filtering member connected to compare output frequency of the variable oscillator in the chosen set frequency unit with the frequency spectrum and providing output pulses for each frequency coincidence above a predetermined threshold frequency. The general control unit 20 also contains a pulse counter adapted to be preset to a number indicative of the desired frequency and to provide a switching signal changing the variable oscillator from exploratory control to a synchronized control when the number of coincidence pulses received corresponds to said preset number. Each of the set frequency units 30-60 contains, in addition to the variable frequency oscillator, a monitoring and filtering circuit in which the variable oscillator output frequency is modulated with the frequency spectrum received from the general control unit 20 to provide a first frequency, a phase discriminator comparing this frequency with a second stabilized frequency received from the general control unit 20 to provide a synchronizing control, and switching circuitry responsive to the switching signal from the counter in the general control unit 20 to change the variable oscillator from exploratory control to synchronized control when its output frequency coincides with the desired frequency set up in the frequency selector unit 10. The frequency selector unit may be remote from the other units and may comprise an automatic arrangement, the frequencies desired being set up in advance, e.g. on perforated tape. The manual control unit shown contains, in addition to the frequency selector knobs 12, associated visual indicators 13 indicating the frequency set up, and in addition to the switching devices 15 for choosing the unit to be controlled, visual indicators 14 which light up when the frequency indicated at 13 is obtained synchronized from the relevant set frequency unit. Subsidiary range knobs 16 each cover a section of the synthesized range of frequencies, switching into operation four corresponding oscillators in each of the set frequency units. The connection of the selected set frequency unit to the frequency selector unit is effected by an engagement control knob 11 1 , and a controller 17 enables resynchronization of one of the output frequencies to take place automatically if it has been lost accidentally; it consists of a memory in which is stored each of the desired frequencies, coupled to a logic circuit which automatically operates the controls of the frequency selector unit to repeat the exploratory and synchronizing processes. In another embodiment (Fig. 4, not shown) the frequency selector unit includes monostable multivibrators individually selectable to synchronize respective set frequency units with desired frequencies set up in succession in the frequency selector unit, the general control unit having groups of AND gates equal in number to the number of set frequency units associated with the synthesizer, the variable oscillators of these set frequency units being selectively connectable through one of the groups of AND gates to the exploratory control voltage generator by the monostable multivibrators.

    8.
    发明专利
    未知

    公开(公告)号：FR1539716A

    公开(公告)日：1968-09-20

    申请号：FR110793

    申请日：1967-06-16

    Applicant: CIT ALCATEL

    Inventor： BERMAN LEON

    IPC: H03L7/22 ,  H04J1/06

    Abstract: 1,160,848. Frequency generators; automatic frequency control. C.I.T. -COMPAGNIE INDUSTRIELLE DES TELECOMMUNICATIONS. 17 June, 1968 [16 June, 1967], No. 28648/68. Headings H3A and H3F. A frequency synthesizer produces a plurality of different synchronized output frequencies from respective set frequency units 20-60 each of which is capable of being set by means of a general control unit 20 to a desired frequency set up in a frequency selector unit 10 which has controls 12 to select a desired frequency and switching devices 15 for choosing the unit whose output frequency is to be synchronized with the desired frequency. The general control unit 20 provides a spectrum of stabilized frequencies with any of which the chosen set frequency unit may be synchronized, a generator providing an exploratory control voltage to a variable oscillator in the chosen set frequency unit, and a modulating and filtering member connected to compare output frequency of the variable oscillator in the chosen set frequency unit with the frequency spectrum and providing output pulses for each frequency coincidence above a predetermined threshold frequency. The general control unit 20 also contains a pulse counter adapted to be preset to a number indicative of the desired frequency and to provide a switching signal changing the variable oscillator from exploratory control to a synchronized control when the number of coincidence pulses received corresponds to said preset number. Each of the set frequency units 30-60 contains, in addition to the variable frequency oscillator, a monitoring and filtering circuit in which the variable oscillator output frequency is modulated with the frequency spectrum received from the general control unit 20 to provide a first frequency, a phase discriminator comparing this frequency with a second stabilized frequency received from the general control unit 20 to provide a synchronizing control, and switching circuitry responsive to the switching signal from the counter in the general control unit 20 to change the variable oscillator from exploratory control to synchronized control when its output frequency coincides with the desired frequency set up in the frequency selector unit 10. The frequency selector unit may be remote from the other units and may comprise an automatic arrangement, the frequencies desired being set up in advance, e.g. on perforated tape. The manual control unit shown contains, in addition to the frequency selector knobs 12, associated visual indicators 13 indicating the frequency set up, and in addition to the switching devices 15 for choosing the unit to be controlled, visual indicators 14 which light up when the frequency indicated at 13 is obtained synchronized from the relevant set frequency unit. Subsidiary range knobs 16 each cover a section of the synthesized range of frequencies, switching into operation four corresponding oscillators in each of the set frequency units. The connection of the selected set frequency unit to the frequency selector unit is effected by an engagement control knob 11 1 , and a controller 17 enables resynchronization of one of the output frequencies to take place automatically if it has been lost accidentally; it consists of a memory in which is stored each of the desired frequencies, coupled to a logic circuit which automatically operates the controls of the frequency selector unit to repeat the exploratory and synchronizing processes. In another embodiment (Fig. 4, not shown) the frequency selector unit includes monostable multivibrators individually selectable to synchronize respective set frequency units with desired frequencies set up in succession in the frequency selector unit, the general control unit having groups of AND gates equal in number to the number of set frequency units associated with the synthesizer, the variable oscillators of these set frequency units being selectively connectable through one of the groups of AND gates to the exploratory control voltage generator by the monostable multivibrators.

    9.
    发明专利
    未知

    公开(公告)号：FR1483745A

    公开(公告)日：1967-06-09

    申请号：FR41449

    申请日：1965-12-08

    Applicant: CIT ALCATEL

    Inventor： BERMAN LEON

    IPC: H03L7/20

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