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    Cross loop antenna
    81.
    发明授权
    Cross loop antenna 失效
    交叉环天线

    公开(公告)号：US3721989A

    公开(公告)日：1973-03-20

    申请号：US3721989D

    申请日：1971-06-30

    Applicant: NORTHROP CORP

    Inventor： CHRISTENSEN A

    IPC: H01Q7/08

    CPC classification number: H01Q7/08

    Abstract: Two orthogonal arrays of ferrite cores wound and connected in series. The arrays are insulated from each other to provide predictable inductance. The arrays preferably form a square inside of which a low-noise amplifier is connected directly to each array, the amplifiers forming a built-in part of the antenna assembly. A design for a small, narrow-band 10 KHz to 14 KHz antenna is described, having a large effective height.

    Abstract translation: 铁氧体磁芯的两个正交阵列缠绕并串联连接。 阵列彼此绝缘以提供可预测的电感。 阵列优选地形成正方形内部，其中低噪声放大器直接连接到每个阵列，放大器形成天线组件的内置部分。 描述了一种小型，窄带10KHz至14KHz天线的设计，具有较大的有效高度。

    Diffusion brazing of aluminum and aluminum base alloys
    84.
    发明授权
    Diffusion brazing of aluminum and aluminum base alloys 失效
    铝和铝基合金的扩散修复

    公开(公告)号：US3581382A

    公开(公告)日：1971-06-01

    申请号：US3581382D

    申请日：1968-10-07

    Applicant: NORTHROP CORP

    Inventor： WELLS ROBERT R ,  MAYS BOBBY J ,  KRINKE TERRY A

    IPC: B23K35/00 ,  B23K31/02 ,  B23K35/24

    CPC classification number: B23K35/002

    Abstract: A SELF-FLUXING METHOD FOR JOINTING TWO SURFACES OF ALUMINUM AND ALUMINUM BASE ALLOYS COMPRISING COATING ONE OF THE MATING SURFACE WITH A THIN LAYER OF COPPER, THEN PLACING A THIN LAYER OF TIN OVER THE COPPER, PLACING THE TWO PIECES TO BE JOINTED TOGETHER AND HEATING TO AT LEAST THE EUTECTIC TEMPERATURE FOR A TERNARY ALUMINUM-COPPER-TIN ALLOY SYSTEM. THE MAXIMUM TEMPERATURE OF HEATING CAN BE LOWERED BY THE ADDITION OF A SMALL AMOUNT OF SILVER WHICH IS COATED ON THE COPPER BEFORE THE TIN LAYER IS PLACED THEREON.

    Integrated system for reporting aircraft data
    85.
    发明授权
    Integrated system for reporting aircraft data 失效
    用于报告飞机数据的综合系统

    公开(公告)号：US3581014A

    公开(公告)日：1971-05-25

    申请号：US3581014D

    申请日：1970-02-09

    Applicant: NORTHROP CORP

    Inventor： VOGEL ALVIN R ,  MOORE DOUGLAS A ,  FOLAN MARTIN P ,  BUCK JOHN R

    IPC: B64D45/00 ,  G05D1/00 ,  G08B25/01 ,  G08B3/10 ,  G08G5/00

    CPC classification number: G08B25/012 ,  G05D1/0061

    Abstract: Various aircraft parameters are sensed by function sensors, the outputs of these sensors being fed to a signal conditioner and evaluator where the signals are processed and the magnitudes of these various parameters evaluated. When the magnitude of any of these parameters is above or below certain predetermined limits, an output signal is fed to a transmitter which transmits a voice message indicating the out-of-limits condition. The occurrence of out-of-limit conditions for any of these parameters is also digitally encoded and recorded for future reference. Certain outputs of the signal evaluator and conditioner indicative of selected aircraft flight and operating conditions are continually fed to a digital data encoder where they are placed in suitable condition for recording in digital form and from where they are fed to a continually recycling recorder for recordation.

    Pseudo voltage controlled oscillator
    87.
    发明授权
    Pseudo voltage controlled oscillator 失效
    PSEUDO电压控制振荡器

    公开(公告)号：US3568077A

    公开(公告)日：1971-03-02

    申请号：US3568077D

    申请日：1968-09-03

    Applicant: NORTHROP CORP

    Inventor： FUJIMOTO YOSHIAKI

    IPC: G01S5/10 ,  G01S1/30 ,  G06G7/186 ,  H03C3/00 ,  H03K4/501 ,  H03K5/00 ,  H03K5/04 ,  H03K7/04 ,  H03K7/08 ,  H03L7/06 ,  H03B3/04

    CPC classification number: H03K7/04 ,  G01S1/30 ,  G06G7/1865 ,  H03C3/00 ,  H03K4/501 ,  H03K5/00 ,  H03K5/04

    Abstract: For use in a VLG navigation system, such as the Omega Navigation system, a phase tracking loop in a receiver receives incoming signals from transmitting stations. The tracking loop contains four electronically controlled pseudo voltage-controlled oscillators, to eliminate the need for all but one master crystal oscillator, whose outputs provide necessary signals within the receiver. The pseudo oscillator comprises an integrator and a voltage-to-phase converter using an external clock pulse input and suitable control logic. The voltage-to-phase converter comprises a one-shot multivibrator in which the delay time is proportional to the input signal level. Thus, the periods between return times of the one-shot multivibrator to its original state provide a frequency which is controlled by input voltage level. When the phase-shift range exceeds + OR - 90* , the trigger pulse to the one-shot multivibrator is advanced or delayed, and the integrator is reset to zero.

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