Message generator for a controlled radio transmitter and receiver

Claim 1

For use in radio communication system having a command station transmitter for transmitting outbound messages, each outbound message being formed by a sequence of binary bits at a first rate and comprising a first synchronizing word of nine bits, a first address word of eight message bits and four parity bits and produced at least three times, a second synchronizing word of nine bits that are the binary inversion of said nine bits of said first synchronizing word, a second address word of eight message bits and four parity bits and produced at least three times, a third synchronizing word of nine bits that are the binary inversion of said nine bits of said first synchronizing word, and a command word of eight message bits and four parity bits and produced at least three times; a command station receiver; a controlled station transmitter; and a controlled station receiver for receiving outbound messages from said command station transmitter, a message generator comprising: a. first means for connection to said controlled station receiver for deriving a received outbound message transmitted by said command station transmitter, and received by said controlled station receiver; b. second means connected to said first means for producing an inbound message only in response to a predetermined outbound message, said inbound message being formed by a sequence of binary bits at a second rate that is one and one half times said first rate and comprising a synchronizing preamble having a plurality of different binary bits, said first synchronizing word, said first address word produced at least three times, said second synchronizing word, said second address word produced at least three times, said third synchronizing word, and a response word of eight message bits and four parity bits and produced at least three times; c. and third means connected to said second means for applying said produced inbound message to said controlled station transmitter.