Now connect the radio audio output to your PC line input with a 3.5mm jack cable. If not, you are tuned to the "wrong" side of the signal and you need moving the frequency knob further down until the audio tone disappears and then comes back again - this time the tones will get higher in pitch as you tune downwards. If it's a real radio, make sure that if you turn the frequency knob down (to a slightly lower frequency) then the audio tones you here go *up* in frequency. #RASPBERRY PI FLDIGI SOFTWARE#Make sure that the radio or SDR software is set to USB mode. Carrier Shift: (Custom) 600Hz (910Hz for earlier boards).To do this, first select RTTY by choosing "Op Mode" then "RTTY" then "Custom" from the menu: Once the initial setup process has finished, you need to set the parameters of the signal from your tracker. "Stereo Mix" or "Virtual Line 1" (see for more information). For an SDR you need to select the device that you set that up for - e.g. If you are using a real radio then that is connected to the "line in" socket (or "mic" if you don't have one) so you should select "Line In". the device that it will listen to for those 2 tones. The most important setting is the audio source - i.e. It's best to use something fairly short (say max of 8 characters) as the callsign will later appear on the live map. When you first start dl-fldigi, you will be asked to enter your callsign (which could be a Ham radio callsign, or some suitable identifier (e.g. For more information about using dl-flldigi see here. #RASPBERRY PI FLDIGI INSTALL#So, download and install dl-fldigi from here. Of course this only happens if you publicise your flight! By using this system, you are "crowd sourcing" the reception of your balloon telemetry and live images, meaning that even if you fail to receive part of the flight, hopefully someone else will be able to fill in the gaps. 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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