Abstract: A frequency synthesized multichannel radio apparatus comprising a synthesized tranceiver and a remotely mountable control unit. All the possible channel frequencies available to users in a large geographical area are stored in a PROM mounted in the transceiver said PROM serving as a look-up table. The addresses of those channel frequencies in the PROM which are available to a particular user are stored in an electrically alterable storage means, such as an EAROM or a E.sup.2 PROM, contained in the control unit. In normal operation a channel selector in the control unit selects a particular channel in the electrically alterable storage means which in turn reads-out addresses of predetermined locations in the PROM which supplies data for example synthesizer divide numbers to the frequency synthesizer.