What is great, is the decoded packets can been sent by anyone, not only the owner of the balloon. This makes possible to send a balloon from UK, then track it for exemple to Ukraine with listeners in this area.
Informations on installation (compilation) of dl-fldigi are available on UKHAS wiki and are working fine on Debian too.
You need to enable deb-src in source.list then:
sudo apt-get update sudo apt-get build-dep fldigi sudo apt-get install git-core libcurl4-openssl-dev libjpeg62-dev autoconf git clone git://github.com/jamescoxon/dl-fldigi.git cd dl-fldigi git submodule init git submodule update autoreconf -vfi ./configure --disable-flarq make ./src/dl-fldigi
Menu Op Mode, RTTY, and for this sound, use the folowing settings
To load the downloaded wav file, select File/Audio/Playback to play it without using the sound card for first test.
This sound record of the 2 frequencies can be decoded and flight informations displayed.
If the decoding is fine, you can move to test #2
This test is close to a real flight where sound comes from Gqrx output.
Use pavucontrol (Pulse Audio Volume Control) to adjust the recording settings:
Bellow, dl-fldigi is listening (choose Monitor of… ) et select analog input.
Bellow, the output volume on the speakers:
Bellow, the mic disabled
Bellow,the volume of totem playing the wav file.
On dl-fldigi side:
It seems PortAudio is using ALSA.. which is using PulseAudio…
It’s also possible to directly use PulseAudio.
To start dl-fldigi in HAB mode which contain the list of registered flight, with all settings ready, use the folowing command:
Result of playing the wav file with totem with dl-fldigi in HAB mode.
/!\ During my fists tests, with several computers, several distros, the decoding with the sound card didn’t work.
After few days of tests, I solved the problem by changing the default-sample-rate to 48000:
sudo vi /etc/pulse/daemon.conf ; default-sample-rate = 44100 default-sample-rate = 48000 pulseaudio --kill
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