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Old October 11th 18, 04:40 PM posted to rec.aviation.soaring
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Default "Do It Yourself" airborne proximity warning device

Alas the 915 MHz band and other ISM bands are already congested with many other uses, and (from the wikipedia page) "communications equipment operating in these bands must tolerate any interference generated by ISM applications, and users have no regulatory protection from ISM device operation." These bands were not intended for reliable communications use. It is a shame that we are forced into those marginal wastelands in the spectrum to do these things, while there are many hundreds of, e.g., aviation band comm frequencies available, now that they've been divided into 25 KHz channels (and 8.33 KHz in Europe and perhaps someday in the USA too). Of which gliders are officially allowed to use, what, 2 channels (dating to the 100 KHz spacing days), for air-to-air coordination?