TRANSCEIVER PROGRAMMABLE CHANNEL SELECTION

摘要

In order to simplify the programming or reprogramming of the available channel frequencies in a frequency synthesised multichannel radio apparatus, all the available channel frequencies are stored in a PROM (40) mounted in a transceiver (14), the PROM (40) serving as a look-up table. The addresses of those locations in the PROM (40) which are available to a particular user are stored in an electrically alterable storage means (42), such as an EAROM or a E<2>PROM located in a control unit (12) which is normally mounted remotely from the transceiver. In normal operation a channel selector (24) in the control unit (12) selects a particular channel in the electrically alterable storage means (42) which in turn reads-out addresses of predetermined locations in the PROM (40) which supplies data, for example synethsiser divide numbers, to a frequency synthesiser (22) in the transceiver (14). …If it is desired to programme reprogramme the addresses of the channel frequencies available to a user then a data transfer unit (34) which has been preprogrammed with the addresses of the new channel frequencies is connected to the electrically alterable storage means (42) and the new sequence of channel frequency addresses is stored in the storage means. The reprogramming can be done with the apparatus in situ which saves time and avoids opening-up the apparatus.