The "dl" modifications upload the demodulated data to web servers which collate information from all listeners of your payload. The "dl" part of the name stands for "Distributed Listener". These 2 tones have to be converted to digital 1's and 0's - a process is called "demodulation - and this is done by a free program called dl-fldigi, which is a modified version of fldigi. The Pi In The Sky software transmits data using 2 slightly different radio fequencies, which are converted by a radio receiver (SDR or a "real" radio) to 2 audio frequencies. The SDR software (there are several choices including SDRSharp and HDSDR) can send the resulting audio signal to a "virtual" audio cable, provided by software which you need to install (see ). You get what you pay for here, and whilst the cheap TV dongles do work, the other devices are much more sensitive and will work over greater distances.
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