Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2002-04-15
2008-09-30
Nguyen, Duc (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S067110, C455S226400, C379S390010
Reexamination Certificate
active
07430412
ABSTRACT:
An apparatus (10) is disclosed for testing a receiver (18). The apparatus (10) includes a digitally controlled attenuator (30) and controls, including a programmable logic device (38), to control both the final value of attenuation and the rate of change of attenuation from the initial attenuation value in the attenuator (30) to the final value of attenuation. Both the final value of attenuation and the rate of change of attenuation can be selected by the operator on the control panel (20) with attenuation select switches (22) and rate select switch (26). Alternatively, the attenuation can be input with an attenuation control knob (28). A digital display (24) displays the attenuation. The apparatus (10) can be remotely controlled with a GPIB control.
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4 pages(pp. 52,53?,54,55?) of catalog from General Microwave on Series 349 & 349H PIN diode attenuators, Year- 1999.
Nguyen Duc
Thier Michael T
Thompson & Gustavson L.L.P.
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