==== RTL_SDR Radiohead ====

  * Raspberry Pi v3
  * NooElec NESDR Nano 2+ Tiny RTL-SDR
  * IEEE802.3af PoE 48V to 5V (2.4A) Micro USB adapter

==== Links ====
[[http://sdr.hu/|OpenWebRX receivers]]

==== rtl-sdr ====
   > sudo apt-get install -y  cmake pkg-config libusb-1.0
   > sudo apt-get install git
   > git clone git://git.osmocom.org/rtl-sdr.git
   > cd rtl-sdr/
   > mkdir build
   > cd build
   > cmake ../ -DINSTALL_UDEV_RULES=ON
   > make
   > sudo make install
   > sudo ldconfig

Edit /etc/modprobe.d/raspi-blacklist.conf
     blacklist dvb_usb_rtl28xxu
     blacklist rtl2832
     blacklist rtl2830

Edit /etc/rc.local
   sleep 10
   _IP=$(hostname -I) || true
   if [“$_IP”]; then
   printf”My IP address is %s\n” “$_IP”
   /usr/local/bin/rtl_tcp -a $_IP &
   fi
   exit 0

Create firewall service for rtl_tcp
   > sudo nano /etc/firewalld/services/rtl_tcp.xml
      <?xml version="1.0" encoding="utf-8"?>
      <service>  
         <short>rtl_tcp</short>  
         <description>rtl_tcp</description>  
         <port protocol="tcp" port="1234"/>  
     </service>
   > sudo chmod 640 /etc/firewalld/services/rtl_tcp.xml 
   > sudo firewall-cmd --permanent --add-service=rtl_tcp