I suspect the world would be better if that percentage were even greater.
HF Beacon for MIT Atlantic Balloon Program
Courtesy of Bill Meara over at SolderSmoke, check out this link to the HF Beacon for MIT Atlantic Balloon Program. It’s a pretty simple 1.5w transmitter for 30m that could be built for about $25. It’s heart is a 74HC540 octal inverter chip, and uses two 2n7000 transistors. Very neat!
Comment from dennis ka6vkp
Time 12/6/2016 at 2:17 pm
What Frequency?
What Mode?
Weight?
Ive been think of a long duration balloon since the 80’s. Built one around the 8051 derivative in the early 90’s, but too heavy. It did make a good CW weather station beacon.