Abstract: An amplifier comprises first, second, and third modulators. The first modulator includes an input for receiving a first input signal, and an output for providing a first modulated output signal corresponding to the first input signal. The second modulator includes an input for receiving a second input signal, and an output for providing a second modulated output signal corresponding to the second input signal. The third modulator has an input for receiving a third input signal, and an output for providing a third modulated output signal corresponding to the third input signal and for providing a virtual ground. A first amplifier circuit is coupled to the outputs of the first and third modulators for driving a first load. A second amplifier circuit is coupled to the outputs of the second and third modulators for driving a second load.

Abstract: An amplifier comprises first, second, and third modulators. The first modulator includes an input for receiving a first input signal, and an output for providing a first modulated output signal corresponding to the first input signal. The second modulator includes an input for receiving a second input signal, and an output for providing a second modulated output signal corresponding to the second input signal. The third modulator has an input for receiving a third input signal, and an output for providing a third modulated output signal corresponding to the third input signal and for providing a virtual ground. A first amplifier circuit is coupled to the outputs of the first and third modulators for driving a first load. A second amplifier circuit is coupled to the outputs of the second and third modulators for driving a second load.

Abstract: Briefly, according to the invention, the interface device comprises matching device (20 and 22) for coupling a duplex information signal (21 and 23) to a simplex or a duplex radio (6) which provides a corresponding information signal (27) acknowledged by the half duplex or full duplex radio (6). Additionally, a signal detecting means (24) determines a desired signal strength and controls an interrupt signal (32). A means for sending (26) the interrupt signal (32) to the radio (6) sends the interrupt signal once the signal detecting means detects the desired signal strength. Finally, the interface device of the present invention comprises a means for sending (26) the corresponding information (27) once the interrupt signal is sent.

Abstract: A programming station for aligning two-way radios. The station allows alignment of various radio control functions through use of a menu driven format. A relative value display is provided for many of the alterable values.