Portable digital signal transceiver providing communication via a terrestrial network and via a satellite network
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United States of America Patent
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Oct 8, 1996
Grant Date -
N/A
app pub date -
Jun 21, 1994
filing date -
Jun 25, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A dual mode portable digital radio transceiver for communicating via a terrestrial network (first mode) and via a satellite network (second mode) synthesizes a modulation first frequency for modulation of signals transmitted in both modes and a conversion second frequency for demodulation of signals received in the two modes. It divides the conversion second frequency supplying a conversion third frequency for demodulation of signals received in one of the modes using a signal receive frequency band far away from the other frequency bands used. It is therefore possible, using a single synthesized pure carrier, to carry out direct conversion in a first mode and intermediate frequency conversion followed by the same direct conversion in the second mode.
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