Abstract: A method and apparatus for generating an MSK detectable signal with reduced side lobe energy of the type in which the MSK detectable signal has two combined orthogonal channels to transmit a data signal. A predetermined channel envelope modulation waveform pattern is selected in accordance with a group of data bits, and the respective orthogonal channels are amplitude modulated with the selected predetermined waveforms. The addition of the orthogonal channels results in a constant amplitude signal with greatly reduced energy in the higher order sidelobes.

Abstract: A simple technique and circuit is disclosed to replace prior Z-.theta. type discriminators in supplying the loading and phasing control signals to the impedance matching network in an automatic antenna tuner. The new circuit samples forward and reflected voltage V.sub.f and V.sub.r (or equivalently I.sub.f and I.sub.r) in the RF input. The loading control signal is supplied according to the in-phase component of V.sub.r relative to V.sub.f. The phasing control signal is supplied according to the quadrature component of V.sub.r relative to V.sub.f. The magnitude of each of the in-phase and quadrature V.sub.r components is reduced to zero by the matching network to thus reduce the phasor amplitude of V.sub.r to zero and hence eliminate reflected voltage.

Abstract: A carrier signal modulated with digital data is transmitted through a medium polluted with harmonic signals by asymmetrically positioning the carrier signal frequency between two adjacent harmonics and employing a baud rate for the data so that the (sin x)/x spectral density nulls of the modulated carrier signal in the frequency domain coincide with the two adjacent harmonics, thus affording efficacious discrimination against the harmonics in the receiver detector which has a matching frequency response.