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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 4993021 | Automatic transmit power level control in radio links The automatic transmit power level control in multiline radio links using a multilevel QAM modulation is basically comprised of: means to derive a threshold signal for each RF channel in each receiver, means to multiplex all threshold signals from the individual re... | 02/12/1991 |
| 4991164 | Automatic transmit power level control in radio links A system for stabilization of the coupling value between the transmitted radio signals resulting from cross polar discrimination, using the transmit power level control in radio link systems formed of several radio channels using multilevel QAM modulation... | 02/05/1991 |
| 4890300 | Radio transmitters A radio transmitter includes a bank of pre-distortion circuits each of which is selectively connectable between the mixing stages of the transmitter and the final linear power amplifier stage of the transmitter. The pre-distortion circuit to be connected ... | 12/26/1989 |
| 4841281 | Apparatus for controlling a switching amplifier An apparatus for controlling the output of a switching amplifier includes a signal dividing circuit which generates a delayed replica of the carrier signal and a doubled signal having twice the carrier frequency. The doubled signal is effective for establ... | 06/20/1989 |
| 4755773 | Phase modulator apparatus for generating a burst phase-modulated wave A time division communication system tends to develop noise responsive to variations of the output of the voltage supply which occur as the time slot signals switch on or off to thereby vary the load demand placed upon the power supply. The invention elim... | 07/05/1988 |
| 4737968 | QPSK transmission system having phaselocked tracking filter for spectrum shaping A system for transmitting digital data employs an angle modulated carrier signal having constant amplitude and a limited spectrum. The system comprises an offset quadrature phase shift key (QPSK) modulator with a "tracking filter" phaselocked loop at the ... | 04/12/1988 |
| 4706262 | FSK or FM burst signal generating apparatus A burst signal generating apparatus and related method includes a modulator circuit for modulating a carrier wave of an intermediate frequency signal with a modulating signal. The output of the modulator having a carrier wave frequency is converted to a r... | 11/10/1987 |
| 4700151 | Modulation system capable of improving a transmission system In a modulation system responsive to a system input signal for supplying an amplifier having nonlinearities with a modulated analog signal to make the amplifier produce an amplified output signal, the system input signal conveys a baseband signal having a... | 10/13/1987 |
| 4592073 | Burst signal transmission system A signal control circuit for a burst signal transmission system has a comparator for receiving a burst control signal from a burst control signal generator and an output signal from an envelope detector and for generating a difference signal therebetween.... | 05/27/1986 |
| 4581749 | Data frequency modulator with deviation control An automatic deviation control circuit for an angle modulated data transmitter is disclosed wherein the deviation level of modulated data is controlled by a modulation cancelling deviation error detection feedback loop. After the modulation is cancelled f... | 04/08/1986 |
| 4462001 | Baseband linearizer for wideband, high power, nonlinear amplifiers The baseband linearizer attenuates the amplitude of the in-phase and quadrature phase components of the baseband signal as a function of the transfer characteristic of the high power amplifier and under the control of a baseband signal power level detecto... | 07/24/1984 |
| 4412337 | Power amplifier and envelope correction circuitry Generating apparatus providing a preferred pulse envelope which is compared to the envelope of output pulses from a nonlinear power amplifier, the error between the two being used, along with a stored predistorted pulse, to generate an updated predistorte... | 10/25/1983 |
| 4291277 | Adaptive predistortion technique for linearizing a power amplifier for digital data systems Distortion introduced into a multiamplitude signal format by a high power microwave amplifier is compensated by a system which adapts itself to non-linearities present in the amplifier and predistorts the input signals before they are subjected to the non... | 09/22/1981 |
| 4261053 | PSK Modulator with reduced adjacent channel interference A PSK modulator employs a waveform of the overlapped raised cosine type which results in reduced adjacent channel interference. Waveforms of the overlapped raised cosine type include the overlapped raised cosine waveform itself as well as waveforms substa... | 04/07/1981 |
| 4087755 | Solid state pulse generator for an air navigational system Solid state apparatus for transmitting signals in an air communication, navigational or identification system wherein a signal generator produces pulses of a desired character and repetition rate. In a normal mode of operation, Gaussian-shape pulses are f... | 05/02/1978 |
