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Alan wrote:
European manufacturers of collision avoidance hardware for sailplanes are proposing to use 433 MHz for the signals from their aircraft mounted transmitters. These would use a propriatary (secret) signal protocol to transmit position, altitude, velocity, and other tracking information to other aircraft with their equipment on board. While it is a sense of "radiolocation", it is not radar in the sense of current radiolocation activities on the band. Note that the transmitters and receivers will be located in aircraft (not just sailplanes), and will cover a wide area. As collision avoidance equipment they would likely be considered safety of life, and not get along well with shared frequencies. I have not heard of this in the amateur community, and I doubt that the ARRL knows about it, though they have been objecting to ground based robots operating on those frequencies. It sounds like a camel nose in the tent. It sounds like reinventing the wheel to me. There are already systems being implemented on aviation frequencies to do this. See for example: http://en.wikipedia.org/wiki/Automat...ance-broadcast http://en.wikipedia.org/wiki/Traffic...oidance_system Also cheap (for aircraft) portable systems: http://www.zaon.aero/ Any such system must get blessed by both the frequency regulators (FCC in the US) and the aviation regulators (FAA in the US) and I wouldn't give this thing a snowball's chance in Hell of getting approval in the US or any other country of any significance. -- Jim Pennino Remove .spam.sux to reply. |
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