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    • 1. 发明授权
    • Two-way radio having a PLL
    • 具有PLL的双向无线电
    • US4969210A
    • 1990-11-06
    • US154550
    • 1988-02-10
    • Kenneth A. HansenRalph T. Enderby
    • Kenneth A. HansenRalph T. Enderby
    • H04B1/40H03C3/09H03J5/02H03J5/24H04B1/16
    • H03C3/0966H03C3/0941H03C3/0958H03J5/0272H03J5/242H04B1/16
    • A method and arrangement for electronically bandswitching a radio (100) is described which includes at least a receiver (110, 111), a PLL (120), and a fully synchronized, programmable counter as a frequency divider (140) that is coupled between the receiver and the PLL. This fully synchronized divider (140) provides an output signal (143) at a lower frequency with minimal harmonic energy and improves the sideband noise performance as the divisor increases. When the radio also includes a transmitter (104), stepped attenuators (128, 132) are also included for adjusting the modulation of the PLL (120) when in the transmit mode.The PLL includes at least a reference signal generator (121, 122), a phase detector (124), and a voltage controlled oscillator (127) having an output (129) coupled, via a feedback path, to a second input (131) of the phase detector (124). The fully synchronized, programmable frequency divider includes at least a counter, a data loader, a half-period detector, and a synchronizer which are configured and arranged to provide an output signal (143) having a duty cycle, nearly equal to 50%, which is independent of a divisor and which simplifies the filtering requirements thereafter, thereby providing electronic bandswitching for the radio while exhibiting fast-locking and low-noise characteristics.
    • 描述了一种用于电子频带切换无线电(100)的方法和装置,其包括至少一个接收机(110,111),PLL(120)和作为分频器(140)的完全同步的可编程计数器, 接收器和PLL。 这个完全同步的分压器(140)以较低频率提供具有最小谐波能量的输出信号(143),并且随着除数增加而改善边带噪声性能。 当无线电还包括发射机(104)时,还包括步进衰减器(128,132),用于在发射模式时调节PLL(120)的调制。 PLL包括至少参考信号发生器(121,122),相位检测器(124)和压控振荡器(127),其具有经由反馈路径耦合到第二输入端(131)的输出(129) 相位检测器(124)。 完全同步的可编程分频器至少包括计数器,数据加载器,半周期检测器和同步器,其被配置和布置成提供具有几乎等于50%的占空比的输出信号(143) 其独立于除数,并且此后简化了滤波要求,从而为显示快速锁定和低噪声特性的无线电提供电子频段切换。
    • 5. 发明授权
    • Conveyor construction
    • US06298981B1
    • 2001-10-09
    • US09450368
    • 1999-11-29
    • Michael A. HoschScott M. HallDaniel E. ErtelKenneth A. Hansen
    • Michael A. HoschScott M. HallDaniel E. ErtelKenneth A. Hansen
    • B65G2344
    • B65G23/44
    • A conveyor construction includes a frame, a drive section stationarily mounted to the frame, and a tensioning section mounted for longitudinal movement relative to the frame. The drive and tensioning sections each include a spindle, and a belt is engaged with the spindles. The frame defines an upper support surface disposed below the upper run of the belt, and mating engagement structure is provided on the belt and the upper support surface for preventing lateral movement of the belt relative to the upper support surface. The drive and tensioning sections include spaced side members, each of which defines an inwardly opening cavity for receiving a bearing assembly for rotatably supporting the spindle. The bearing-receiving cavity faces the spindle, and each side member defines outer wall structure which engages and supports the belt outwardly of the spindle. The belt overlies the outer wall structure of each side member and the adjacent belt-engaging portion of the spindle, so as to seal the inwardly facing opening and prevent ingress of moisture or other contaminants into the bearing-receiving cavity. A drive and locking arrangement for imparting movement to the tensioning section and for selectively locking the tensioning section in position includes a pair of pinion carriers or retainer blocks mounted one to each side of the frame, with a drive pinion being rotatably supported by the retainer blocks. Each side member includes integrally formed gear teeth engageable with opposite ends of the drive pinion, and a drive pinion actuator is engaged with one side of the frame for imparting rotation to the drive pinion to extend and retract the tensioning section. A locking arrangement is interconnected with the opposite end of the drive pinion, and functions to selectively frictionally engage the drive pinion with one of the retainer blocks to prevent rotation of the drive pinion and to thereby maintain the tensioning section in a desired position relative to the frame.
    • 10. 发明授权
    • Low frequency astable oscillator having switchable current sources
    • 具有可切换电流源的低频不稳定振荡​​器
    • US4365213A
    • 1982-12-21
    • US197386
    • 1980-10-16
    • Kenneth A. HansenRonald H. Chapman
    • Kenneth A. HansenRonald H. Chapman
    • H03K3/282H03K3/283H03B5/36
    • H03K3/2823H03K3/283
    • A low frequency oscillator of the astable type having good frequency stability, fast starting, good immunity to DC loading, and suitable for fabrication in integrated circuit form. First and second switching transistors of the astable multivibrator are cross-coupled by a coupling capacitor and a frequency determining crystal. Base drive to the respective switching transistors and charging current to the capacitor and crystal are provided by a pair of differential amplifiers which are referenced to a forward biased diode. The differential amplifiers are also connected to respective collector terminals of the switching transistors. The capacitor is of small value suitable for containment within an integrated circuit with the oscillator circuit. The differential amplifiers substantially increase the impedance levels in the oscillator and shift base drive to the switching transistors to minimize the effects of DC loading at the output terminals of the oscillator.
    • 低频振荡器具有良好的频率稳定性,启动速度快,对直流负载的良好抗扰性,适用于集成电路形式的制造。 不稳定多谐振荡器的第一和第二开关晶体管通过耦合电容器和频率确定晶体交叉耦合。 对各个开关晶体管的基极驱动和对电容器和晶体的充电电流由一对参考正向偏置二极管的差分放大器提供。 差分放大器也连接到开关晶体管的各个集电极端子。 该电容器具有小的值,适用于与振荡器电路集成电路内的容纳。 差分放大器基本上增加了振荡器中的阻抗电平,并将基极驱动转换到开关晶体管,以最小化振荡器输出端的直流负载的影响。