Abstract: Reduced and low work function materials capable of optimizing electron emission performance in a range of vacuum and nanoscale electronic devices and processes and a method for reducing work function and producing reduced and low work function materials are described. The reduced and low work function materials advantageously may be made from single crystal materials, preferably metals, and from amorphous materials with optimal thicknesses for the materials. A surface geometry is created that may significantly reduce work function and produce a reduced or low work function for the material. It is anticipated that low and ultra-low work function materials may be produced by the present invention and that these materials will have particular utility in the optimization of electron emissions in a wide range of vacuum microelectronics and other nanoscale electronics and processes.

Abstract: Reduced and low work function materials capable of optimizing electron emission performance in a range of vacuum and nanoscale electronic devices and processes and a method for reducing work function and producing reduced and low work function materials are described. The reduced and low work function materials advantageously may be made from single crystal materials, preferably metals, and from amorphous materials with optimal thicknesses for the materials. A surface geometry is created that may significantly reduce work function and produce a reduced or low work function for the material. It is anticipated that low and ultra-low work function materials may be produced by the present invention and that these materials will have particular utility in the optimization of electron emissions in a wide range of vacuum microelectronics and other nanoscale electronics and processes.

Abstract: There is disclosed in a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal and a third type voice signal, a remote communication interface for providing transmission therebetween comprising a duplexer/bridge network for transceiving the signal, means for determining the signal type to be transmitted, low pass filters and analog to digital and digital to analog converters for processing received and transmitted signals, and a digital signal processor for modulating and demodulating the signal for transmission/reception according to the signal type. There is also disclosed means for adjusting the clock sampling frequency during the demodulation process to obtain bit sync, bit tracking and frequency tracking.

Abstract: There is disclosed an improved frequency hopping synchronization and tracking system for bit syncing and frame syncing a digital data signal as transmitted by a radio transmitter. A detection means responsive to incoming data samples representative of the phasing signal portion of the digital data signal partitions the data samples into alternating first and second sample sequences and correlates the samples against a frequency hop modulation code reference sequence to provide an initial data signal detection. A post-detection means responsive to the initial detection and to the frequency hop modulation code reference sequence correlates the incoming data samples and compares the spectral power of the correlated data samples to a threshold value to provide bit sync of the detected data signal.

Abstract: There is disclosed in a frequency hopping digital communication network having a multimode radio transmitter for transmitting a data signal and a multimode radio receiver tuned for receiving the same, the multimode transmitter and receiver operable in a first standard mode and a second enhanced mode, each mode having a late-net acquisition library period and an in-net acquisition library period, a method for obtaining a non-noisy frequency channel over which to receive the data signal transmitted across the radio network. The method comprises the steps of successively averaging signal samples received over a particular frequency channel and time interval corresponding to the receiver mode and library period to determine the noise level of the particular reception frequency channel. The averaged signal samples are then compared to a predetermined noise threshold to determine whether the frequency channel is noisy.

Abstract: In a digital communications system for communicating between two radios by transceiving a signal comprising a first type control signal, a second type data traffic signal, and a third type voice signal, a remote communication interface for providing transmission therebetweeen comprising a duplexer bridge network for transceiving the signal, low pass filters, and analog to digital and digital to analog converters for processing received and transmitted signals respectively, and a digital signal processor for modulating and demodulating the signal for transmission or reception according to the signal type. A control signal output from the digital signal processor enables adjustment of the clock sampling frequency during the reception and demodulation process to obtain bit sync, bit tracking and frequency tracking.

Abstract: There is disclosed in a frequency hopping digital communications system having a transmitter for transmitting a data signal via a noisy transmission path, and a receiver responsive to the transmitted signal for receiving the same, a method for removing bias in the data signal at the receiver comprising the steps of: forming a sample amplitude histogram from the received data signal samples for a given hop frequency; correlating the amplitude histogram against a stored reference amplitude histogram to obtain a correlated output signal having a peak correlation position; determining the position difference between the peak correlation position and the correlation center position to provide an offset signal corresponding to the difference and indicative of an estimated bias offset value; and applying the estimated bias offset value to the received signal samples in response to the offset signal to obtain an output signal indicative of an unbiased received data signal.