Telecommunications – Transmitter – Including tuning
Reexamination Certificate
2005-05-24
2005-05-24
Trost, William (Department: 2683)
Telecommunications
Transmitter
Including tuning
C455S120000, C455S213000, C455S286000, C455S306000, C455S307000, C455S339000, C455S561000
Reexamination Certificate
active
06898419
ABSTRACT:
Remotely controllable actuators are provided to alter the cavity size of bandpass cavity filters to alter the bandpass characteristics. In one embodiment, a stepper motor is used to provide lateral movement of a tuning plate to alter the size of the cavity. The neck of the cavity is also changed in length through the use of a tuning motor. A feedback loop is used to provide fine tuning of the length of the neck in response to changes due to temperature and vibration to offer maximum propagation of the signal to be transmitted. A coupling tuner is used to adjust to the resulting change in Q to the cavity. A tuning processor is used to receive signals from a remote location identifying the desired characteristics of the filter.
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Carlson Brad W.
Fayeski Eric S.
Ewart James D
Nortel Networks Corporation
Trost William
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