====== SDR ======

  * https://www.youtube.com/watch?v=cAqRAnNAYXE
  * GQRX + DSD : http://www.george-smart.co.uk/wiki/Digital_Speech_Decoder
  * GQRX + DSD : not to follow compilation from here : http://notes.secretsauce.net/notes/2014/07/25_decoding-p25-with-rtl-sdr-on-debian.html
  * Tips and Tricks: http://gqrx.dk/doc/practical-tricks-and-tips

==== HAM Radio ====
  * tohle bude na testu: <del>http://www.crk.cz/PREFC</del> mrtvý odkaz
  * [[http://www.ctu.cz/cs/download/zkousky-prukaz/amaterske_zkousky_faq_03-2009.pdf|Otázky pro písemné testy]] pro získání jednotlivých druhů průkazů amatérské radiokomunikační služby včetně správných odpovědí.
  * HAM krouzek v Ova: v po-čt 9-12h se dostavit na VŠB, FEI, Martin Tomis, EA109, kde tě zaregistruji do klubu, ale k dědovi Novákovi můžeš i bez toho... klubový poplatek je tuším 50Kč/rok [[http://radioklub.vsb.cz/|Radioklub VŠB]]
===== Prozkoumat =====
  * http://kmkeen.com/rtl-demod-guide/
  * http://eliasoenal.com/2012/05/24/multimonng/
  * https://www.linux.com/news/software/developer/17942-socat-the-general-bidirectional-pipe-handler
  * JACK: http://kacper.blog.redpill-linpro.com/archives/508
  * GQRX Scanner module: https://github.com/khaytsus/gqrx-scan
  * Poslouchani letadel, vceten anteny: http://www.rtl-sdr.com/adsb-aircraft-radar-with-rtl-sdr/
  * velky poratl HAM stranek v CR-SK: http://www.ok2kkw.com/ok.htm
  * http://www.delta-team.cz/co-se-pise/ham/frekvence-ruznych-sluzeb.htm
  * http://forum.autoforum.cz/viewtopic.php?f=14&t=1063 <-- zajimave frekvence
  * http://599.cz/view.php?cisloclanku=2012070701 - dipol pro zacatecniky, a zrejme i dobry web
  * http://websdr.org/ - WebSDR software - poslouchame SDR radio pres web
  * https://github.com/simonyiszk/openwebrx - alternativa k WebSDR
  * https://github.com/kpreid/shinysdr - dalsi alternative k WebSDR
  * http://www.aprs.org/ - APRS: Automatic Packet Reporting System
===== Anteny =====
  * https://www.eshop-yachtmeni.cz/antena-sd-1300-u-scan/
  * http://599.cz/view.php?cisloclanku=2012070701 - dipol pro zacatecniky, a zrejme i dobry web
  * http://dl1dbc.net/SAQ/miniwhip.html - PA0RDT Mini Whip active antenna
===== Examples of Digital modes =====
  * http://hfradio.org.uk/html/digital_modes.html

===== Gqrx =====
<code>
$ brew update
$ brew upgrade # may be unnecessary
$ brew tap metacollin/gnuradio
$ brew install gnuradio # took 55 mins on my laptop & installed python via homebrew
$ brew install librtlsdr --HEAD # this installed b4c4e723f3656954f160b3f8df4e8804e4a46acd for me
$ brew tap chleggett/gqrx
$ brew tap chleggett/gr-osmosdr
$ pip install cheetah
$ brew install gqrx
$ brew linkapps gqrx
$ open /Applications/Gqrx.app/Contents/MacOS/Gqrx
</code>

Run with:
   /usr/local/Cellar/gqrx/2.4/Gqrx.app/Contents/MacOS/Gqrx 
===== DSD =====
<code>
$ brew install dsd
</code>
===== SOCAT =====
<code>
$ brew instal socat
</code>

===== 1090 MHz : flight radar =====
   * pretty complex article with even DYI antenna designs: http://www.rtl-sdr.com/adsb-aircraft-radar-with-rtl-sdr/
   * easy multi-platform Flight Radar : https://github.com/MalcolmRobb/dump1090
==== dump1090 ====
<code>
mkdir ~/sdr; cd ~/sdr
git clone https://github.com/MalcolmRobb/dump1090
cd dump1090; make
./dump1090 --interactive --net
</code>

   * more info README.md or dump1090 --help
   * in web browser : http://localhost:8080/

===== Scanners =====
   * http://eartoearoak.com/software/rtlsdr-scanner


===== GnuRadio on BannanaPI =====
  * http://gnuradio.4.n7.nabble.com/Compiling-GNURadio-on-BananaPI-td51866.html

edit like this
   deb http://mirrordirector.raspbian.org/raspbian/ jessie  main contrib non-free rpi
patch whole system
   apt-get update
   apt-get upgrade
apt gnuRadio
   apt-get install gnuradio
   
==== DSD : Digital Speech Decoder ====
   * http://www.george-smart.co.uk/wiki/Digital_Speech_Decoder

not tested:
<code>
sudo apt-get install cmake
cd ~
mkdir dsd-src
cd dsd-src
wget -O mbelib.zip https://github.com/szechyjs/mbelib/archive/master.zip
wget -O dsd.zip https://github.com/szechyjs/dsd/archive/master.zip
unzip mbelib.zip
unzip dsd.zip
rm *.zip
cd mbelib-master
mkdir build
cd build
cmake ..
make
sudo make install
sudo ldconfig /usr/local/lib
cd ~/dsd-src/dsd-master
mkdir build
cd build
cmake ..
make
sudo make install
add snd-pcm-oss to /etc/modules
amixer cset numid=3 1
<reboot>
</code>

testme:
<code>
dsd -i /dev/dsp -n -v 1
</code>

showme what you can do:
<code>
over@picka ~/digital_speech/dsd/build $ dsd -a
Digital Speech Decoder 1.7.0-dev (build:v1.6.0-86-g7ee04e5)
mbelib version 1.3.0
xcb_connection_has_error() returned true
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround40
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
xcb_connection_has_error() returned true
xcb_connection_has_error() returned true
xcb_connection_has_error() returned true
xcb_connection_has_error() returned true
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started

PortAudio version number = 1899
PortAudio version text = 'PortAudio V19-devel (built Feb 21 2014 06:46:01)'
Number of devices = 7
--------------------------------------- device #0
Name                        = sunxi-CODEC: PCM (hw:0,0)
Host API                    = ALSA
Max inputs = 2, Max outputs = 2
Default sample rate         = 44100.00
--------------------------------------- device #1
Name                        = sysdefault
Host API                    = ALSA
Max inputs = 128, Max outputs = 128
Default sample rate         = 44100.00
--------------------------------------- device #2
Name                        = pulse
Host API                    = ALSA
Max inputs = 32, Max outputs = 32
Default sample rate         = 44100.00
--------------------------------------- device #3
Name                        = mmap0
Host API                    = ALSA
Max inputs = 2, Max outputs = 2
Default sample rate         = 44100.00
--------------------------------------- device #4
Name                        = dmix
Host API                    = ALSA
Max inputs = 0, Max outputs = 2
Default sample rate         = 48000.00
--------------------------------------- device #5
[ Default Input, Default Output ]
Name                        = default
Host API                    = ALSA
Max inputs = 32, Max outputs = 32
Default sample rate         = 44100.00
--------------------------------------- device #6
[ Default OSS Input, Default OSS Output ]
Name                        = /dev/dsp
Host API                    = OSS
Max inputs = 16, Max outputs = 16
Default sample rate         = 44100.00
----------------------------------------------
</code>

  * so in case we want to use default device, lets tak its #5
<code>
dsd -i pa:5 -o pa:5
</code>  
  * manipulate soudn outputs/inputs by 
<code>
  pavucontrol
</code>
  * pipe I/O to fucntional device
<code>
padsp dssocat UDP-RECV:7355 - | padsp dsd -i /dev/dsp -o /dev/dsp
</code>
==== RTL-SDR ====   
   * http://kmkeen.com/rtl-demod-guide/
   * http://www.kerrywong.com/2014/11/16/testing-an-rtl-sdr-spectrum-analyzer/
   * http://www.rs-online.com/designspark/electronics/eng/blog/taking-the-raspberry-pi-2-for-a-test-drive-with-gnu-radio-2

   * https://www.youtube.com/watch?v=qPWD4imXXsc - RTL-SDR: GQRX and DSD decoding in GNU/Linux command line. 
   * http://marcinkowski.ca/blog/2014/02/19/decoding-dmr-radio-using-rtlsdr-gqrx-and-pulseaudio --- howto pro predchozi radek
   * http://notes.secretsauce.net/notes/2014/07/25_decoding-p25-with-rtl-sdr-on-debian.html
<code>
   aptitude install rtl-sdr rtl-sdr gr-osmosdr gqrx-sdr cmake libsndfile1-dev pavucontrol libitpp-dev
XXXX:   aptitude install python3-pip
</code>

=== RADIO-TEORIE ===
   * Evidence stanic bezdrátového místního informačního systému (BMIS) | Český telekomunikační úřad:
http://www.ctu.cz/vyhledavaci-databaze/evidence-stanic-bezdratoveho-mistniho-informacniho-systemu-bmis/prehled

   * ANTENNA MAGUS - List of Antennas | Explore | Features | The leading Antenna Design Software tool. | Antenna Design. Simplified:
http://www.antennamagus.com/antennas.php?page=antennas

=== NOTES ===
<code>
22:16:03 < Over23> bry vecer, prosba prosbouci
22:16:13 < Over23> je tu nekdo kdo si hraje s dsd?
22:16:31 < Over23> konkretne tenhle problem:
22:16:34 < Over23> over@picka ~ $ socat UDP-RECV:7355 - | dsd -i /dev/stdout
22:16:34 < Over23> Digital Speech Decoder 1.7.0-dev (build:v1.6.0-86-g7ee04e5)
22:16:34 < Over23> mbelib version 1.3.0
22:16:34 < Over23> Error, couldn't open /dev/audio
22:16:36 < Over23> 2016/03/19 23:15:52 socat[8975] E write(1, 0x7d5438, 256): Broken pipe
22:17:56 < Jenda`> Over23: vždy jsem dekodoval jen wav, musí být 1ch 48kHz S16_LE
22:18:49 < Over23> muzu videt nejaky priklad?
22:20:07 < Over23> respektive cesta tedy ma byt bud z gqrx > wav > dsd chalu li dobre [resp sdr_fm > file]
22:20:18 < Over23> respektive cesta tedy ma byt bud z gqrx > wav > dsd chalu li dobre [resp sdr_fm > file > dsd]
22:20:50 < Jenda`> ffmpeg -i foo.wav -ac 1 -ar 48000 -y ble.wav; dsd -i ble.wav -w out.wav
22:21:03 < Jenda`> foo.wav je z gqrx
22:21:18 < Jenda`> nahrané jako nbfm s šířkou alespoň 13 kHz</code>