Patents Assigned to Cushman Electronics, Inc.
  • Apparatus and method for sweep oscillator calibration
    Patent number: 4603305
    Abstract: A method and apparatus for generating a sweep signal, the frequency of which is accurately known at all times during the sweep cycle. The beginning and ending frequencies are fixed by a phase-locked loop and the resulting error correction voltages are stored. During the sweep, these error voltages determine the offset and slope of the D.C. voltage ramp signal which governs the frequency of the sweep oscillator.
    Type: Grant
    Filed: July 24, 1984
    Date of Patent: July 29, 1986
    Assignee: Cushman Electronics, Inc.
    Inventor: Earl McCune
  • Method and apparatus for television distribution system sweep testing
    Patent number: 4408227
    Abstract: This invention is a method (and an apparatus in combination) for sweep testing of cable television distribution systems and the like, wherein time division multiplexing between test signal and program signal is accomplished in such manner as to eliminate interference to the program signal due to testing. Additionally, the test signal received by the detector is time demultiplexed in such manner that the test signal is displayed clearly without interfering signals.
    Type: Grant
    Filed: June 3, 1981
    Date of Patent: October 4, 1983
    Assignee: Cushman Electronics, Inc.
    Inventor: Jack Bradley