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tackyattack
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I am thinking about launching a near space balloon. I'm going to send up a microcontroller with a pressure sensor that outputs audible beeps according to the height data from the pressure sensor. The problem is I don't have a way to transmit this audio data back down to earth. What is the cheapest, simplest way to make a transmitter that can transmit 60 miles line-of-sight? I don't want to buy a ham radio transmitter cause those things cost $100+. Any ideas?
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