(under the class definition) Subject matter including means for control of the amplifier which may be for control of the bias of an amplifier device electrode or of a variable impedance for the signal channel, wherein the signal input includes a component of a particular frequency not involved in the signal for signal purpose, which is selected by a means in or associated with the amplifier and applied to the control means or used to develop a control voltage applied to the control means.
(1) Note. See the class definition, Lines With Other Classes and Within This Class, for other systems utilizing pilot frequency control.
SEE OR SEARCH THIS CLASS, SUBCLASS:
85, for signal feedback amplifiers having an amplifier in the feedback path.
86, for signal feedback amplifiers having a variable impedance in the feedback path controlled by a separate control path.
96, for signal feedback amplifiers combined with control of bias of the signal amplifier.
127+, appropriate subclasses, for control of bias or power supply, particularly subclasses 130 and 132. See the search notes under subclass 127. See also (2) Note under subclass 130.
143, for amplifiers having a thermally responsive impedance which may be controlled by a separate means.
144+, for amplifiers having a variable impedance which may be controlled by a separate control path.
SEE OR SEARCH CLASS
333, Wave Transmission Lines and Networks, appropriate subclasses for pilot current controlled transmission line systems, generally. See the note and search notes.
370, Multiplex Communications,
491, and 500 for a multiplexing system using pilot control.
