Telecommunications – Transmitter and receiver at same station – With frequency stabilization
Patent
1994-06-21
1996-10-08
Faile, Andrew
Telecommunications
Transmitter and receiver at same station
With frequency stabilization
455 77, 455 87, 455 89, 4551901, 455314, H04B 138
Patent
active
055640761
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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Alcatel Mobile Communication France
Faile Andrew
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