fluxcoil wiki

• Fedora:
  • gnuradio: allrounder software, dnf -y install gnuradio-examples gr-osmosdr rtl-sdr
  • gqrx: watching the spectrum, dnf -y install gqrx
  • SDR++ dnf install sdrpp (not outputting audio to my hdmi audio sink)
  • SDR-Angel: mostly for recording & analyzing
  • Universal Radio Hacker: mostly for recording & analyzing
  • rtl_433: mostly for recording & analyzing
  • OpenWebRx rx.linkfanel.net https://www.openwebrx.de/ https://www.receiverbook.de/
  • OpenWebRX+ https://fms.komkon.org/OWRX/ has some nice features like freely tunable frequency, but does not play well with my RTL-SDR's
• Kali Linux
  • Convenient as kismet brings in plugins already for ADSB scanning (planes), also AMR
  • https://github.com/bemasher/rtlamr
  • apt install rtl-433 rtl-sdr bladerf-firmware gnuradio gqrx-sdr gr-osmosdr
  • install SDR++ (built for debian sid from github)
• DragonOS

• my devices:
  • RTL-SDR Blog V4 R828D RTL2832U 1PPM TCXO SMA Software Defined Radio with Dipole Antenna, USD $39.95
  • RTL-SDR Blog SMA Straight Antenna Adapter Set, USD $14.95
• Various SDR hardware
  • RTL-SDR V4 Dongle
  • Hack RF
  • Hack RF one with portapack
  • https://www.crowdsupply.com/lime-micro/
  • https://www.crowdsupply.com/microphase-technology/antsdr-e200
  • tinySA Ultra spectrum analyzer
  • Flipper Zero

• https://blinry.org/50-things-with-sdr/
• 202306: German SDR introduction video: https://media.ccc.de/v/gpn21-57-sdr-software-defined-radio-eine-einfhrung
• 202408: Grey Fox Introduction to Software Defined Radio For Offensive and Def
• 202408: Bernerd: reliable radio communications, in German
• OpenWebRX: Recent State of Development
• Frequencies I can use with Japanese level 4, via site
• wspr, ft8, js8 transmitter
• rtl_433 Germany:
  • interesting areas: 433, 866-870MHz (esp. 868MHz), 915Mhz
  • interesting Germany: rtl_433 -f 866Mhz -f 867Mhz -f 868Mhz -f 869Mhz -f 870Mhz -f 433Mhz -H 10
  • rtl_433 -M level -T 120 -f 911M -s 2048k -F kv -F json:log.911.json -v -S known
  • rtl_433 -f 866Mhz -f 867Mhz -f 868Mhz -f 869Mhz -f 870Mhz -f 433Mhz -f 911Mhz -M level -H 20 -s 2048k -F kv -F json:log.json -v
• rtl_433 Japan:
  • 866-870MHz: heavily used, but I can not receive single clear signals with the rtl-sdr and undirected antenna
  • 915Mhz: nothing
  • rtl_433 -f 923.7Mhz -f 924.4Mhz -f 925.3Mhz -f 925.7Mhz -f 926.5Mhz -f 927.7Mhz -M level -H 20 -s 2048k
  • rtl_433 -f 433.02Mhz -M level -s 2048k
• rtlamr
  • rtl_tcp -a 0.0.0.0/ rtlamr -centerfreq 860000000 -agcmode true
• TODO
  • try FM digi modes: VaraFM, 8PSK
  • identify these signals seen
  • take another look at the power smartmeter: fill into sigwiki, try to record

..does not provide output to my HDMI output device. Workaround:

• Start VLC, go to Media→Open Network Stream, check 'Show more options'
• Enter 'TCP://127.0.0.1:20022' (without quotes) as network URL
• Set Edit Options: ":demux=rawaud :rawaud-channels=1 :rawaud-samplerate=48000 :rawaud-fourcc=s16l" (without quotes)
• Enable the TCP server in the SDR plugin, and click Play in VLC

Using OpenWebRX+ on Debian Bookworm, by default, I did not receive anything with my RTL-SDR v4. Observed on amd64 and aarch64 (raspi4) systems. This driver update was required. Thread on this. Required steps:

sudo apt-get install libusb-1.0-0-dev git cmake pkg-config
git clone https://github.com/rtlsdrblog/rtl-sdr-blog
cd rtl-sdr-blog
mkdir build
cd build
cmake ../ -DINSTALL_UDEV_RULES=ON
make
sudo make install
sudo cp ../rtl-sdr.rules /etc/udev/rules.d/
sudo ldconfig

echo 'blacklist dvb_usb_rtl28xxu' | sudo tee --append /etc/modprobe.d/blacklist-dvb_usb_rtl28xxu.conf

https://www.tele.soumu.go.jp/resource/search/myuse/use/ika.pdf

• 431.09Mhz, 431.06Mhz: quite strong, sensors? OpenWebRX+ ISM decoder can not decode them
• 430.97Mhz
• 143.18Mhz, sensors?

• receiving: works ok with rtl-sdr, on various bands
• sending:
  • Kenwood TH-75, would be able to send on 70cm and 2m bands. Software JTDX, WSJTX: both can not tune into 144.46Mhz, where I see activity. Can tune to 144.45Mhz and send, but that's not received by rtl-sdr even when receiving on that very frequency.
  • Turns out the Kenwood TH-75 can not send in ssb.. would be required as FT8 uses upper sideband.