Link to this headingLimeSDR

Notes: If using gqrx make sure you select the correct antenna for data to work.

Scan for Possible Frequencies:
A frequency scanner for Gqrx Software Defined Radio receiver

Link to this headingPager

Decoding POCSAG Pager Transmissions with rtl_fm and multimon-ng

Use GQRX as a pipe:

  1. Click the three dots button on the bottom right of the window
  2. Go to the Network Tab and set the UDP host and port to localhost:7355
  3. Click the UDP Button To start the streaming

Use multimon-ng to demodulate and Interpret the signal:

nc -l -u 7355 | sox -r 48000 -t raw -b 16 -c 1 -e signed-integer /dev/stdin -r 22050 -t raw -b 16 -c 1 -e signed-integer - | multimon-ng -t raw -c -a POCSAG512 -a POCSAG1200 -a POCSAG2400 -a FLEX -a SCOPE -f alpha /dev/stdin

Link to this headingBoat Location

Modulator:

# ./rtl_ais -d 00000003 -h 127.0.0.1 -P 10110 -S 60 #View on OpenCPN

Decode Signals:
Decoding AIS maritime navigation Signals
simple AIS tuner and generic dual-frequency FM demodulator
Docker Container

Link to this headingAirplane Location

dump1090

Link to this headingAircraft Communications Addressing and Reporting System (ACARS)

  • 131.550 MHz

ACARS SDR decoder
How to build a Airband receiver

Link to this headingCellular Device

This program show you IMSI numbers of cellphones around you.
Building a Cellphone IMSI Catcher (Stingray)

Gnuradio blocks and tools for receiving GSM transmissions

Kalibrate GSM Search:

#Start to search for 900Mhz GSM stations : kal -s 900 -g 49.6 -e 23

Link to this headingTemperature Sensors

Program to decode radio transmissions from devices on the ISM bands

Running on a Limesdr:

rtl_433 -driver=soapysdr -t "antenna=LNAW,bandwidth=4.5M"

Link to this headingCordless Phone

real-time DECT voice channel decoding by Gnuradio

Link to this headingVoice Radio

This includes the radios of the following

  • Police scanner
  • EMS
  • Taxis
  • Fire

Link to this headingP25

Link to this headingDMR/MotoTRBO

DSD from GQRX:

#Make the temp Pipe mkfifo /tmp/sdr_pipe # Pipe the GQRX to std input socat UDP-RECV:7355 - | ./dsd -i /dev/stdin -o /tmp/sdr_pipe # Play Audio from the pipe aplay -r 8000 -f S16_LE -t raw -c 1 < /tmp/sdr_pipe

Oneline P25 Listening:

./dsd -f1 -mc -i <(rtl_fm -F1 -o4 -g32 -f 484.7918M -s48000 -) -o >(aplay -r 8000 -f S16_LE -t raw -c 1)

Link to this headingPOCSAG/FLEX-A

Link to this headingWeather Balloon Signals

Frequency: 400-406 MHz

Automatically Track Radiosonde Launches using RTLSDR or AirSpy SDRs
400-406 MHz radiosonde decoding

Link to this headingAmateur Radio

  • Frequency: 126 MHz

Link to this headingUniversal Radio Hacker (URH)

Example on Decoding RF

Link to this headingAnalysis

Link to this headingInterpretation