Abstract: A binary gas analyzer instrument and analysis method for determining percent composition of a cooling gas within a turbine generator is disclosed. The instrument includes a measurement block having a plurality of cells therein, some of which comprise sealed cells containing a known reference gas. One of the cells comprises a measurement cell and contains the binary gas mixture to be evaluated. Each of the cells contains a thermistor and a heater is provided for keeping the cells at a substantially constant temperature. An electric current supply provides a constant current to each thermistor for selfheating, and the gas within each cell conducts heat away from the thermistor at a distinctive rate.

Abstract: A method for transmission of information, received at a transmitter of a power distribution system, over at least one conductor of that distribution system, requires the reception, at the transmitter, also of at least one PLC signal at a power-line communications (PLC) frequency and from an associated first conductor portion of the system. The transmitter processes the local data signal and the PLC signal to generate another PLC signal, also at the PLC frequency, which is coupled through the non-saturating core of a transmitter-coupling current transformer to inject a PLC current into a second conductor portion of the system. The PLC signal is eventually received by a receiver, connected to a system conductor at a location different from the location of the transmitter, and the transmitted information is recovered therefrom.

Abstract: Method and apparatus for synchronizing a transmitter and a receiver in a synchronous serial transmission system by serially transmitting a plurality of pseudorandom, coded sync words in an interlaced fashion with corresponding bits of each word transmitted in sequence. At the receiver, received bits are first directed to a plurality of registers to undo the interlacing process and then decoded with the decoded word being compared by an autocorrelation technique to a known reference to thereby establish or reestablish synchronization between transmitter and receiver.

Abstract: A method for decoding error correction coded information having been encoded using a linear cyclic block code, such as a Golay (23,12) code, or an extended Golay (24,12) code, to form a message word, comprises serially examining each bit of the message word and forming another code word wherein the Hamming distance between the other code word and the sequential pattern of bits examined is not greater than the error correction capability of the message word. Apparatus for forming the other code word and for checking Hamming distances is described.

Abstract: A method for improving reception of a data word to be sent from an origination station to a destination station comprises generating and storing error correction functions for a message word including the data word. Error correction functions are transmitted only if the message word is invalidly received thus offering improved performance over a conventional retry scheme. Interleaving reduces susceptibility to burst noise and altering carrier frequency for retransmissions minimizes effects of noise. The method is especially useful in a system comprising a central receiver and a plurality of physically separated remote transmitters wherein electrical path quality between receiver and transmitters may independently randomly vary.