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57 条记录 (耗时 0.015 秒)

    Fornia
    16.
    发明授权
    Fornia 失效

    公开(公告)号：US1730577A

    公开(公告)日：1929-10-08

    申请号：US1730577D

    IPC分类号： G01S3/06

    CPC分类号： G01S3/065

    Frequency locking system for direction finders
    19.
    发明授权
    Frequency locking system for direction finders 失效
    方向探测器频率锁定系统

    公开(公告)号：US3747107A

    公开(公告)日：1973-07-17

    申请号：US3747107D

    申请日：1972-05-05

    申请人： INT STANDARD ELECTRIC CORP

    发明人： HOLMBOE C ,  POPPE D ,  MATHIESEN O

    IPC分类号： G01S3/06 ,  G01S3/14 ,  H03L7/14 ,  G01S3/04

    CPC分类号： G01S3/14 ,  G01S3/065 ,  H03L7/14

    摘要： A local oscillator control device particularly for loop antenna direction finding equipment. Two equipment modes are provided, one for tuning and frequency surveillance and another for bearing determination, are provided. The local oscillator (LO) is manually controlled and also voltage controlled, the voltage control being imperative during tuning (''''Frequency'''' mode) but operates to stabilize the LO when the ''''Bearing'''' (reading) mode is enabled, within predetermined limits. The circuits operate to revert the mode from ''''Bearing'''' to ''''Frequency'''' whenever the manual LO tuning is activated or a predetermined drift limit is exceeded.