Rodney A Dolman

Title: Innovations of Rodney A. Dolman

Introduction

Rodney A. Dolman is an accomplished inventor based in Lynchburg, VA (US). He has made significant contributions to the field of radio transceivers, holding a total of 2 patents. His work focuses on improving communication technologies through innovative circuit designs.

Latest Patents

One of his latest patents is for a Duplex radio transceiver having improved data/tone and audio modulation. This novel circuit architecture achieves audio, tone, and digital data signal modulation in a full duplex radio transceiver. A single signal source generates both transmitted carrier and receiver local oscillator injection signals. The architecture ensures that the transmitted data does not appear at the receiver's discriminator output, while a 'side tone' of transmitted audio does. The audio to be transmitted is used to frequency modulate a VCO, providing the receiver's first mixer injection signal and a 'carrier' input to a phase modulator. The data/tone signals are combined and integrated in a complex waveform to control the phase modulator. The resulting FM output from the phase modulator is then input to a conventional duplexed RF transmitter.

Another significant patent is the Oscillator control circuit. This invention controls an oscillator to produce the correct frequency in the transmitting condition and a slightly different frequency in the receiving condition. A circuit supplies a first control voltage to the oscillator for transmitting and a second, different control voltage for receiving. This design prevents interference and ensures proper operation of a repeater system. Additionally, it prevents modulation signals from reaching the oscillator in the receiving condition, thus avoiding false signals or other issues.

Career Highlights

Rodney A. Dolman is currently employed at General Electric Company, where he continues to innovate in the field of communication technology. His work has had a lasting impact on the development of radio transceivers.

Collaborations

Throughout his career, Dolman has collaborated with notable colleagues, including Arvid E. Englund, Jr. and Stephen Robert Wynn. These collaborations have contributed to the advancement of technology in their respective fields.

Conclusion

Rodney A. Dolman is a prominent inventor whose work in radio transceivers has led to significant advancements in communication technology. His innovative patents reflect his dedication to improving the efficiency and functionality of radio systems.