Patent ID: 6028885
Filing Date: 2000-02-22
Classification: H04B

Abstract:
A radio transmitter comprising:a digital tuner for generating a modulated carrier signal as a bandpass signal or at baseband;means for generating at least one fixed local oscillator signal (FLO);first means for mixing the modulated carrier signal with the FLO signal to generate a filtered IF signal;an analog IF unit having at least one IF stage to which the filtered IF signal is applied and from which another IF signal is output;a tunable local oscillator (TLO) for generating a TLO signal of selectable frequency;second means for mixing the another IF signal with the TLO signal to generate a radio frequency (RF) signal;means for controlling the TLO and at least the digital tuner or the FLO generating means and the IF unit to generate the RF signal with RF hopping and with digital-tuner frequency hopping and/or IF hopping; andmeans for processing the RF signal for transmission.