My friend Joe and Coyt invited me to come hangout and watch the cub scouts launch a high altitude balloon for their engineering pin. Greg, one of the pack leaders, designed a GPS receiver that transmits data over amateur radio frequencies. Amature radio frequencies have a very long range, so our signal was able to be picked up by any station within line-of-sight, even at 100,000 feet!
Notes From Greg - Posted from comments for more visibility.
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