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The 260-470MHz band has several benefits despite the limitations of the regulations. First, the unusual restrictions placed on the band by the FCC help to keep this set of frequencies clear of interference. Other Part 15 bands are crowded with continuous transmissions of voice, data, video, and hi-level interference from microwave ovens to spread spectrum devices. Second, longer transmission distances are achieved with less power. The free space propagation of frequencies in this range is two times the propagation of 900MHz and five times 2.4GHz. Therefore, lower output power is needed to attain any particular distance, resulting in lower power consumption and extended battery life. Third is cost effectiveness. The components used at these frequencies are significantly lower in cost than those designed for operation at higher frequencies. This allows an excellent balance between product cost and performance. Fourth is ease of export. Many countries worldwide have allocated these frequencies for similar uses. If a product will be sold abroad, this band will provide a wide range of international compatibility.
