Abstract: A plurality of amplitude detectors are employed to detect the envelope of a signal requiring accurate reproduction over a large dynamic range with each of the plurality of detectors being rendered operative one at a time to detect the amplitude of the signal in a different amplitude range of the signal and the others of the detectors not being rendered operative are held inoperative. The output signal of the plurality of detectors when they are rendered operative are coupled to a combining point.

Abstract: The feedback controlled modulation system comprises an extended range, gain controlled detector system disposed in a first feedback loop coupled between the output and input of an amplifier having a non-linear input-output characteristic; a gain controlled reference signal source coupled to the output of the detector system to provide a difference signal in the first feedback loop; and a gain controlling pulse generator coupled to the source and the detector system to simultaneously control the gain of the source and the gain of the detector system to control the shape of the difference signal so as to linearize the non-linear characteristic without loss of loop stability and without causing amplitude distortion in the first feedback loop.

Abstract: A method for varying the relationship of the RF cycles, produced by a reference network, inside a pulse envelope with respect to the start of the pulse envelope. The reference network, properly synthesized, is driven by a doublet impulse wherein the halves of the doublet may be varied both in width and in amplitude. In this manner, it is possible to phase shift the RF cycles by .+-.180.degree. while not effecting movement of the pulse envelope.

Abstract: This relates to an apparatus for obtaining a specific antenna current or voltage waveshape at an antenna. A reference network, which includes a low level lumped element model of the antenna and the transmitter output network, produces drive signals when impulsed. The first of these signals corresponds to a voltage having the desired antenna current waveshape. The second is a voltage having a waveshape which must be produced across the input terminals of the transmitter output network in order that the specified antenna current be produced. The third signal is a voltage which has a waveshape equivalent to the waveshape of a current which must be injected into the input terminals of the transmitter output network in order that the specified waveshape be produced. At least one of these signals is used to drive the transmitter.