A radio for receiving and transmitting high frequency signals. The radio comprises a down-conversion section (206, 208) arranged to down-convert a received first high frequency signal to an intermediate frequency signal; an up-conversion section arranged to up-convert an information signal, to be transmitted, to a second high frequency signal; a filter (220) for filtering the intermediate frequency signal; a detector (224) for information recovery; a variable voltage controlled oscillator (218) connected to the up-conversion section and the down-conversion section for down-converting said first high frequency signal during a receive cycle and up-converting said information signal during a transmit cycle in a time division duplex mode. The up-conversion section, the down-conversion section, and the variable controlled oscillator are integrated on a single IC chip. Also, the variable controlled oscillator is modulated by the information signal during the transmit cycle.