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www.southgatearc.org
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Dash7 on 433 MHzProducts based on the Dash7 wireless networking scheme developed by Savi Technology use 433 MHz which is allocated globally to Radio Amateurs. Initially Dash7 is intended for active tags which can be embedded in products and transmit over a distance of several hundred metres. It is unclear why they chose such an unsuitable frequency as 433 MHz. This frequency has a long wavelength which, in size constrained products, leads to very inefficient antennas. Frequencies such as 917 MHz or 2450 MHz that have a far shorter wavelength allow the design of very small antennas with high efficiency and would appear the best choice for such uses. Read the IEEE article 'Dash7 Wireless Networking Gains Momentum' at Savi Technology
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