Abstract: The present invention relates to a radio communication unit (20) comprising radio communication means (23, 25, 27) for communication (reception and/or transmission) in one or more frequency ranges with associated channel spacings. The radio communication means use oscillator signals for channel selection in the frequency ranges. The radio communication unit further comprises a system clock (77) generating a clock signal having a predetermined frequency that is not divisible by all the channel spacings. According to the invention the oscillator signals used in the channel selection are generated by a frequency synthesizer circuit (29) in the form of a fractional-N PLL circuit, said clock signal being fed as a reference frequency signal to the fractional-N PLL circuit. The invention also comprises a radio telephone comprising such a radio communication unit and the use of such a radio communication unit.

Abstract: A method and arrangement enabling a mobile station (MS1), operating in standby mode and monitoring a control channel (CC1) in a first radio communication network (NET1), to scan for other radio channels (CC4-CC6) without missing messages, e.g. page messages, on the control channel (CC1) intended for the mobile station (MS1). Each message comprises at least one repeated block of information bits. Upon receipt of a message on the monitored control channel (CC1), the mobile station (MS1) dynamically determines a time period during which the blocks of information conveying the message contains no new information intended for the mobile station (MS1). At least part of said time period is then used for scanning of other radio channels (CC4-CC6).

Abstract: A signal combining device and method allows a mobile unit to use a single antenna to receive and transmit information in two or more frequency ranges. The combining device includes a first and second transmitting circuits and a first and second receiving circuits, which are connected to a matching device. The matching device, in turn, is connected to the antenna. The first transmitting circuit and the first receiving circuit are designed to transmit and receive, respectively, a digital signal, and the second transmitting circuit and the second receiving circuit are designed to transmit and receive, respectively, an analogue or a digital signal. By using the signal combining device it is possible to combine signals of different frequency bands, especially digital signals and analogue signals of different frequency bands. As such, the present invention allows for the use of a common antenna in a dual mode radio.