Dual Tone Multi-Frequency (Dtmf) Automatic Radio Telephone Interconnect (Rti) Systems

摘要

The development of improved very high frequency ultrahigh frequency (VHF/UHF)-FM or high frequency single sideband transmission radio communications is discussed. The concept of automatic connectivity to other radio systems, to private lines or to the switched public telephone system is discussed. Research and development carried out the past 5 years to develop simple, inexpensive radio telephone interconnect systems that could be employed to improve communications from the trail and from remote camps by northern and native people are discussed. The research culminated in the development and field trial of prototype systems. Repeater remote control and dual tone multifrequency cone signaling for both FM and single sideband transmission signaling systems are discussed.