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The first benefit of the 902-928MHz band is freedom from the tight limitations and application restrictions the FCC places on other bands. In this band virtually any analog or digital signal can be sent without restrictions on content or duration. Second, higher legal output power allows the potential for much longer transmission distances, particularly for spread spectrum devices. Third, the propagation of frequencies in the 900MHz range is better than higher frequencies such as 2.4GHz. Therefore, lower output power is needed to attain any particular distance, reducing transmitter power consumption. Fourth is antenna size. A useful byproduct of higher frequency is a shorter wavelength. This allows a 1/4-wave antenna in the 900MHz range to typically be less than 3.25 inches in length. In fact, Linx’s Antenna Factor division offers tiny surface mount antennas that are less than 0.65 inches in length, allowing for easier concealment in compact portable products.
