R&D Report 1986-06 : Compatibility of Band II broadcast transmissions at frequencies below 105 MHz with private mobile radio in the band 105-108 MHz. G.H. Millard, R.D.C. Thoday Consideration is given to the problems that may arise with the operation of Private Mobile Radio (PMR) receiving base-stations using the frequency band 105-108 MHz in proximity to broadcast transmitters in Band II. The existing criteria for the protection of the Broadcasting Service from land mobile services and the protection of PMR from broadcast transmitters are given. Measurements made to assess the characteristics of both broadcast transmitters and PMR base-station receivers provide new results for the levels of transmitter sideband noise and spurious emissions and for the susceptibility of the base-station receivers to adjacent-channel interference. These show that the existing ITU sharing criteria for broadcast and mobile services in closely-spaced frequency bands are necessary but are insufficient to permit co-ordinated planning of these services on a non-interference basis. New results in this Report show the importance of taking these factors into account when planning these services.