Abstract: A communication system is provided which offers increased transmission speed while maintaining a low bit error rate. At the transmitter, a digital input is entered and a microprocessor determines from a particular subset of pulse sequence codes a single sequence of pulse coefficients that corresponds to that particular digital input. The sequence of pulse coefficients are then multiplied by a pulse shape, modulate and transmitted. At the receiver, the modulated pulses are demodulated. The demodulated pulses are then, on a pulse by pulse basis, subtracted from each of the subset of pulse sequences with the absolute values of each pulse for each pulse sequence being summed. A comparator selects a sequence of pulse coefficients corresponding to the lowest summed value of a particular pulse sequence, which is then mapped to a digital signal which is the same digital signal as the digital input.

Abstract: A nozzle assembly setting gauge for use in an oil burner to gauge the optimal operating distance between a combustion head and a nozzle. The nozzle assembly setting gauge includes a holder for engaging the nozzle assembly and a head having a cross sectional thickness which defines the optimal operating distance. A technician installs the nozzle assembly setting gauge onto the nozzle assembly and fully inserts the nozzle assembly into oil burner until a front face of the nozzle assembly setting gauge contacts the combustion head. Next, the technician indicates the position of the nozzle assembly at this fully inserted position. The technician removes the nozzle assembly setting gauge and re-inserts the nozzle assembly to the indicated position.