A semi-automatic tuning high frequency communications equipment

This paper describes a high frequency two way communication equipment designed for vehicular mounting. A high degree of frequency accuracy and stability along with simplified semi-automatic transmitter tuning is featured. In addition to voice and code transmission and reception capability, facilities for frequency shift keying and teletype operation without the need of additional conversion equipment or power supplies are provided. A telephone and ringer circuit operating over the two wire remote control line is incorporated. Photographs and block diagrams of the various units are shown.