Dual-mode satellite/cellular phone with a frequency synthesizer

A radio telephone device with the capability of switching between operating through a land-based cellular network and an orbiting satellite system, comprising;

• first antenna and first radio frequency means for receiving transmitted signals from said land-based cellular network and forming first conditioned signals for subsequent numerical decoding;
• second antenna and second radio frequency means for receiving transmitted signals from said orbiting satellite system and forming second conditioned signals for subsequent numerical decoding;
• numerical decoding for processing either said first conditioned signals or said second conditioned signals;
• dual-loop radio frequency synthesizer means comprising a first phase lock loop to generate a first output signal at a first output frequency connected to said first radio frequency means, said first output frequency being programmable to determine reception on a desired land-based cellular network channel frequency and a second phase lock loop to generate a second output signal at a frequency programmably offset from said first output frequency and connected to said second radio frequency means in order to determine reception on a desired channel frequency of said orbiting satellite system.

A radio telephone device with the capability to switch between operating through a land-based cellular network and an orbiting satellite system comprising;

• first antenna and first radio frequency means for receiving transmitted signals from said land-based cellular network and forming first conditioned signals for subsequent numerical decoding;
• second antenna and second radio frequency means for receiving transmitted signals from said orbiting satellite system and forming second conditioned signals for subsequent numerical decoding;
• numerical decoding means for processing either said first conditioned signals or said second conditioned signals to produce an automatic frequency control signal;
• reference frequency generator means controlled by said automatic frequency control signal to produce a reference frequency signal;
• dual-loop radio frequency synthesizer means utilizing said reference frequency signal and comprising a first phase lock loop to generate a first output signal at a first output frequency connected to said first radio frequency means, said first output frequency being programmable to determine reception on a desired land-based cellular network channel frequency, and a second phase lock loop to generate a second output signal connected to said second radio frequency means at a frequency programmably offset from said first output frequency in order to determine reception of a desired channel frequency of said orbiting satellite system.