|1930 - meetup 1900 Ron Minnich: The coreboot project|
|1930 Petr Tomek: Perspektivní pohony mezihvězdných lodí|
|1900 BRMCW - vyuka telegrafie|
Software Defined Radio is a computer peripheral that allows reception (and ideally also transmission) of arbitrary radio waves. Various peripherals have different frequency range, bandwidth and other capabilities. Best known are USRP (Universal Software Radio Peripherial) and RTL-SDR (extremely cheap DVB-T USB stick chipset).
On the software side, GNURadio is the most popular control software. Its modular design allows defining arbitrary signal decoding pathways visually.
We have SDR station on the table near our library (RadioLab), and some antennas on the roof.
So far, we achieved for example:
Currently, we are running with rtl-sdr as RX and Baofeng as TX. We have collected most of money for BladeRF and it will be hopefully available in summer.
Active: see status
TODO: Where/how to get a good antenna?
TODO: What are interesting frequencies to listen to without a super-strong antenna?
Remote listening - tune radio in brmlab, listen at home! Ask Jenda/Mrkva/TomSuch for access.
xtightvncviewer -quality 7 -encodings tight 192.168.77.35:0
Maybe you will need to start a VNC server:
root@radio-observer:~# x11vnc -display :0 -usepw -forever -auth /var/run/lightdm/root/\:0
radio@radio-observer:~$ x11vnc -display :0 -usepw -forever
ssh firstname.lastname@example.org "parecord --channels=1 | oggenc -q "-1" -r -C 1 -" | ogg123 -
Uncompressed (e.g. for further processing)
ssh email@example.com "parecord --channels=1" | aplay -r 44100 -c 1 -f S16_LE
Average delay of this chain is 1-2 seconds.
Tunnel raw data - connect remote radio to your local receiver
ssh -A -L1234:192.168.77.35:1234 firstname.lastname@example.org 'ssh email@example.com "killall rtl_tcp; rtl_tcp -a 0.0.0.0"'
Then start gqrx locally with
Works for me with 300000Hz bandwith.
./gsm_receive_rtl.py -I dump.cfile -d 1 B0