What are the free licence software/tools for rf planning ?

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Link planning Link Planning

The simplest forms of communication systems of the two devices for transmission and reception consisting connects each antenna are within and from each other by a path that should be covered. These two devices need to able to contact each other to the minimum level of the signal to be captured by the antenna and passed to the entrance of the receiver. Called the process of determining the feasibility of the wireless connection link budget calculations link budget. Based access radio signals between the ends of the link whether or not the equipment used and the quality of the signal as a result of diminishing the distance between the ends of the link (and Houma-called losing track path loss).