1978-10-16
1981-07-07
Konick, Bernard
179 16F, H04B 336
Patent
active
042776554
ABSTRACT:
An automatic gain repeater for varying the amplification of AC signals transmitted through a telephone subscriber loop in accordance with the impedance of such subscriber loop is described. The automatic gain control circuitry includes controllable variable gain amplifiers connected in series circuit arrangement with the subscriber loop. The gain of the amplifiers is varied, in a continuous manner, in accordance with the subscriber loop line impedance such that the overall transmission line loss is a constant predetermined value. Gain of the amplifiers is accomplished by means of a control signal generated in a loop extender circuit that is coupled to the subscriber loop.
Impedance networks coupled to gain repeater hybrid transformers provide minimum operating power loss with maximum power transfer between the automatic gain repeater circuit and subscriber loop while maintaining adequate transhybrid loss between the two directions of transmission and matching input impedance.
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Konick Bernard
Lear Siegler, Inc.
Myers Randall P.
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