METHOD TO GENERATE FREQUENCIES IN A DIGITAL RADIOTELEPHONE OPERATING ON TWO DIFFERENT FREQUENCY BANDS

摘要

A method of generating the different frequency signals required in transmission and reception in a digital radio telephone for operation on at least two different frequency bands. According to the method the mixing frequencies (F1, F2) are selected so that from the frequencies obtained as the mixing results it will always be possible to select the intermediate frequencies (IF1, IF2) required in reception and the transmission frequency (FTX) required in transmission for a radio telephone operating on the desired frequency band. Figure