TDRA Regulations for Private Mobile Radio, Version 3.0 4.5 The Authority encourages the deployment of systems that make efficient use of the Radio frequency and will apply frequency re-use based on the coverage are specified in the Authorization. The applicant shall therefore consider the following while dimensioning the system: 4.5.1 The maximum radiated power shall be selected with due consideration of the required coverage area including relevant parameter like building penetration losses. 4.5.2 Maximum radiated powers for base stations and repeaters shall be determined on the basis of the required coverage and intended use as indicated in the application and will be specified as an Authorization condition. 4.5.3 For larger coverage areas preference shall be to use several repeaters or base stations with low radiated power instead of a single repeater or base station with high radiated power. 4.5.4 Wherever applicable, directive antennas shall be preferred over omnidirectional antennas or dipoles. Antenna mounting heights shall be selected as low as possible and appropriate down tilt of antennas shall beused to focus the transmitted power to the required coverage area. 4.6 For coverage requirements beyond specific location e.g. nationwide or Emirate wide, detailed justification shall be submitted to the Authority with the applications including rationalization of the spectrum re-use. The Authority shall evaluate such requestsand reject if justification to the satisfaction of the Authority is not appropriately provided. 4.7 The Authority will determine the number of frequency assignments per system based on the intended use and the requirements as stated in the application. The applicant shall therefore consider the following while dimensioning the system: 4.7.1 For networks requiring more than ten frequency Assignments, it is preferred to consider trunking systems to increase spectral efficiency. The Authority may reject an application if more than ten Frequency Assignments are requested without due consideration of the trunking system option. 4.7.2 For networks using repeaters, duplex frequencies can be requested but the Applicant shall justify the number of channels required for transmission through Base Station or Repeater. Minimum number of frequencies shall be allowed for coverage beyond a specific location. 4.8 The Authority does not support any particular trunking standard or technology. 7