released December 17, 2014
thank you to everyone who contributed to this work by making their recordings available for use:
Eduard Grebe, Andras Kiss, Felix Blume
from the freesound.org
markystar, lonemonk, robinhood76, unfa, edhutschek, audible-edge, LukeIRL, dasebr, JoniHeinonen, FenrirFangs, craftport, thedogryan420, NLM
Sven Grahn for the Soyuz recordings
The Conet Project for the number stations recordings.