H04B 1/0078

Details of transmission systems, not covered by a single one of groups [CPC: H04B3/00] - [CPC: H04B13/00]; Details of transmission systems not characterised by the medium used for transmission {adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands using different intermediate frequencied for the different bands with a common intermediate frequency amplifier for the different intermediate frequencies, e.g. when using switched intermediate frequency filters}