Patents Assigned to Marconi Instruments Ltd.
  • Measuring adjacent channel power
    Patent number: 4810960
    Abstract: A signal source from a transmitter is down-converted by being mixed with a locally generated signal so that a desired adjacent channel band is converted to base band and the adjacent channel power measured after filtering by a low pass filter. To eliminate the notch in the filter characteristics that occurs when the power is measured by a.c coupled means, the locally generated signal is modulated or swept around the center of the adjacent channel band.
    Type: Grant
    Filed: June 11, 1987
    Date of Patent: March 7, 1989
    Assignee: Marconi Instruments Ltd.
    Inventors: David P. Owen, Donald Pearce
  • Control devices
    Patent number: 4107585
    Abstract: A control device which is suitable for use with electronic apparatus is used to scan a range of signal or data values, such as a frequency spectrum, and to cease scanning when a selected parameter is found. The scanning operation is driven by a d.c. ironless motor which, once it has been initially spun by hand, continues to rotate until the selected parameter is detected.
    Type: Grant
    Filed: March 16, 1977
    Date of Patent: August 15, 1978
    Assignee: Marconi Instruments Ltd.
    Inventor: Damer Evelyn O'Neill Waddington