Portable digital signal transceiver providing communication via a terrestrial network and via a satellite network

A dual mode portable digital signal transceiver providing communication in a terrestrial mode and a satellite mode,

• said transceiver providing communication in said terrestrial mode via a terrestrial network using a terrestrial transmit frequency band and a terrestrial receive frequency band,
• said transceiver providing communication in said satellite mode via a satellite network using a satellite transmit frequency band and a satellite receive frequency band,
• said terrestrial transmit frequency band and said satellite transmit frequency band being substantially adjoining, and defining transmit bands of said transceiver, and
• said terrestrial receive frequency band and said satellite receive frequency band being far apart, and defining receive bands of said transceiver,
• said transceiver comprising:
• synthesizer means for synthesizing a first frequency for modulation and a second frequency for demodulation;
• and
• divider means for dividing said second frequency to supply a third frequency for demodulation;
• wherein signals transmitted in any of said transmit bands of said transceiver are modulated using said first frequency,
• wherein signals received in one of said receive bands of said transceiver are demodulated using said second frequency, and
• wherein signals received in another of said receive bands of said transceiver are demodulated using said third frequency.