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====== RTLSDR-Airband ======

Ce logiciel est normalement destine a l’écoute des bandes Aviation. Mais il offre un certain nombre d'options inintéressante pour la Radio Amateur.

  * L’écoute simultané de plusieurs fréquences 
  * la démodulation narrow FM.
  * L'enregistrement lors d'une émission.
  * Plusieurs mode de sorties: Pulse Audio, UDP, IQ Brut

Par exemple avec une simple cle RTL-SDR qui a une capaticite de reception de 3 Msps, il est possible plusieurs d'avoir les 2 Mhz de la bande 2 metres (144Mhz-146Mhz)

{{:ham:rtlsdr-airband_running.png?600 |}}

===== Installation =====

==== RTLSDR-Airband ====

=== Pre-requis ===


  * [[https://github.com/rtl-airband/RTLSDR-Airband/wiki/Installation|RTLSDR-Airband]]

^ --- ^ Lib & packages ^ --- ^
| RTLSDR-Airband | build-essential cmake pkg-config libmp3lame-dev libshout3-dev 'libconfig++-dev' libfftw3-dev | Librairies necessaire |
| RTLSDR-Airband | libpulse-dev | Pulse Audio |
| RTLSDR-Airband | librtlsdr-dev | Cle RTL-SDR  |
| RTLSDR-Airband | libsoapysdr-dev | Soapy SDR |
| RTLSDR-Airband | google-perftools libgoogle-perftools-dev | DSP GPU  |

^ --- ^ Lib & packages ^ --- ^
| pipewire | pipewire pipewire-pulse wireplumber | Audio |
| wiremix | libpipewire-0.3-dev clang cargo | Pirewire TUI Controller |



=== Compilation ===

<code>
cmake -DPLATFORM=native -DNFM=ON -DMIRISDR=OFF -DPROFILING=ON ../
-- Build type not specified: defaulting to Release
-- Found lame includes: /usr/include/lame/lame.h
-- Found lame library: /usr/lib/aarch64-linux-gnu/libmp3lame.so
-- Checking for SoapySDR
--   SoapySDR found, /usr/include, SoapySDR
-- RTLSDR-Airband configuration summary:

-- - Version string:            v5.2.0
-- - Build type:                Release
-- - Operating system:          Linux
-- - SDR drivers:
--   - librtlsdr:               requested: ON, enabled: TRUE
--   - mirisdr:                 requested: OFF, enabled: FALSE
--   - soapysdr:                requested: ON, enabled: TRUE
-- - Other options:
--   - Platform:                native
--   - Build Unit Tests:        FALSE
--   - Broadcom VideoCore GPU:  FALSE
--   - NFM support:             ON
--   - PulseAudio:              requested: ON, enabled: TRUE
--   - Profiling:               requested: ON, enabled: TRUE
--   - Icecast TLS support:     TRUE
-- Configuring done (0.3s)
-- Generating done (0.1s)
-- Build files have been written to: /opt/build/RTLSDR-Airband/build
</code>

<code>
$ make 
[  5%] Generating version.cpp, _version.cpp
[ 10%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/config.cpp.o
[ 15%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/input-common.cpp.o
[ 20%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/input-file.cpp.o
[ 25%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/input-helpers.cpp.o
[ 30%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/mixer.cpp.o
[ 35%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/output.cpp.o
[ 40%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/rtl_airband.cpp.o
[ 45%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/squelch.cpp.o
[ 50%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/ctcss.cpp.o
[ 55%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/util.cpp.o
[ 60%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/udp_stream.cpp.o
[ 65%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/logging.cpp.o
[ 70%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/filters.cpp.o
[ 75%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/helper_functions.cpp.o
[ 75%] Generating version.cpp, _version.cpp
[ 80%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/version.cpp.o
[ 85%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/input-rtlsdr.cpp.o
[ 90%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/input-soapysdr.cpp.o
[ 95%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/pulse.cpp.o
[ 95%] Built target rtl_airband_base
[100%] Linking CXX executable rtl_airband
[100%] Built target rtl_airband
</code>

<code>
$ sudo make install
[  5%] Generating version.cpp, _version.cpp
[ 10%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/version.cpp.o
[ 95%] Built target rtl_airband_base
[100%] Linking CXX executable rtl_airband
[100%] Built target rtl_airband
Install the project...
-- Install configuration: "Release"
-- Installing: /usr/local/bin/rtl_airband
</code>


==== Pipewire ====

=== Installation ===

  $ systemctl --user restart pipewire pipewire-pulse wireplumber

=== wiremix ===

  $ cargo install wiremix --locked

===== Configuration =====

  * 2m-band.config

{{ :ham:2-meters.tar.gz | 2m-band.config }}

^ QRG Mhz ^ Description ^ Mode / BW / Demode ^
| 144,350 | Pager Ham | nFM 22050 POCSAG1200 |
| 144,800 | APRS | nFM 22050 AFSK1200 |
| 144,500 | Images, SSTV, FAX... | nFM |
| 144,600 | Modes numériques, RTTY... | nFM |
| 145,075 | Relais R3 FKIO ARA35  | nFM 12000 |
| 145,3875 | Relais local ARA35  | nFM 12000 |
| 145,500 | FM fréquence d'appel |nFM 12000 |
| 145,450 | Communications d'urgences FRANCE (FM dégagement 1) | nFM 12000 |
| 145,4625 | Communications d'urgences FRANCE (FM dégagement 2) | nFM 12000 |
| 145,475 | Communications d'urgences FRANCE (FM fréquence principale)| nFM 12000 |
| 145,800 | ISS Contact | nFM 12000 |

  * Source [[https://qrvradio.fr/FreqRA.htm#144|qrvradio.fr]]

==== General ====

  multiple_demod_threads = true;  
  multiple_output_threads = true; 

==== device ====

<code>
devices:                                
({                             
  type = "rtlsdr";      
  index = 1;
  serial = "10000001";
  gain = 25;                  
  centerfreq = 145.0;      
  correction = 12;            
  sample_rate = "2.048M"      
  channels:                     
  ( ../.. )
 }
) 
</code>

==== Pager ====

<code>
    {                                  
      freq = 145.35;                   
      label = "pager";                 
      modulation = "nfm";              
      lowpass = 0;                     
      highpass = 0;                    
      bandwidth = 12500;               
      outputs: (                       
        {                              
          type = "udp_stream";         
          dest_address = "127.0.0.1";  
          dest_port = 1234;            
        },                             
      );                               
    },
</code>

==== Phonie ====

<code>
    {
      freq = 145.075;
      squelch_threshold = -30;
      label = "R3 Broc";
      modulation = "nfm";
      bandwidth = 12500;
      outputs: (
        {
          type = "pulse";
          stream_name = "R3_Broc";
        },
        {
          type = "file";
          directory = "/home/djo/transmission";
          filename_template = "R3_Broc";
          continuous = false;
          split_on_transmission = false;
          include_freq = false;
          append = true;
        }
      );
    },
</code>

==== APRS / Pager decoder ====


  multimon-ng sox

  * APRS

  nc -lun 127.0.0.1 1235 | sox -t raw -efloating-point -b32 -r 16000 - -esigned-integer -b16 -r 22050 -t raw - | multimon-ng -v 3 -t raw -A -a AFSK1200 --timestamp - | tee -a APRS.log

  * Pager 

  nc -lun 127.0.0.1 1234 | sox -t raw -efloating-point -b32 -r 16000 - -esigned-integer -b16 -r 22050 -t raw - | multimon-ng -t raw -f auto -a POCSAG1200 -v 3 --timestamp - | tee -a POCSAG1200.log


===== Troubleshooting =====

==== GPU support ====

  ???

<code>
$ cmake -DPLATFORM=rpiv2 -DNFM=ON -DMIRISDR=OFF -DPROFILING=ON ../
-- Build type not specified: defaulting to Release
-- Found lame includes: /usr/include/lame/lame.h
-- Found lame library: /usr/lib/aarch64-linux-gnu/libmp3lame.so
-- Checking for SoapySDR
--   SoapySDR found, /usr/include, SoapySDR
-- RTLSDR-Airband configuration summary:

-- - Version string:            v5.2.0
-- - Build type:                Release
-- - Operating system:          Linux
-- - SDR drivers:
--   - librtlsdr:               requested: ON, enabled: TRUE
--   - mirisdr:                 requested: OFF, enabled: FALSE
--   - soapysdr:                requested: ON, enabled: TRUE
-- - Other options:
--   - Platform:                rpiv2
--   - Build Unit Tests:        FALSE
--   - Broadcom VideoCore GPU:  TRUE
--   - NFM support:             ON
--   - PulseAudio:              requested: ON, enabled: TRUE
--   - Profiling:               requested: ON, enabled: TRUE
--   - Icecast TLS support:     TRUE
-- Configuring done (0.3s)
-- Generating done (0.1s)
-- Build files have been written to: /opt/build/RTLSDR-Airband/build
</code>


<code>
$ make 
[  3%] Generating version.cpp, _version.cpp
[  7%] Building CXX object src/CMakeFiles/rtl_airband_base.dir/config.cpp.o
c++: error: unrecognized command-line option ‘-mfpu=neon-vfpv4’
c++: error: unrecognized command-line option ‘-mfloat-abi=hard’
make[2]: *** [src/CMakeFiles/rtl_airband_base.dir/build.make:86: src/CMakeFiles/rtl_airband_base.dir/config.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:131: src/CMakeFiles/rtl_airband_base.dir/all] Error 2
make: *** [Makefile:136: all] Error 2
</code>