Monitoring Multiple AM channels with RTL-SDR Airband

A new command line program for the RTL-SDR called RTL-SDR Airband has recently been released. The program can be used to simultaneously monitor multiple AM channels per dongle. It is intended to be used with online streaming services like liveatc.net which provide live audio streams of air traffic control communications around the world.

Its features include

  • Decode multiple AM channels per dongle (within bandwidth frequency range)
  • Auto squelch and Automatic Gain Control
  • MP3 encoding
  • Stream to Icecast or SHOUTcast server
  • Low CPU usage on Windows (<4% on i5-2430m) thanks to SSE and AVX instructions
  • FFT using GPU on Raspberry Pi (50-55% CPU with default clock)
Monitoring Multiple AM Channels with RTL-SDR Airband.
Monitoring Multiple AM Channels with RTL-SDR Airband.
Tweet10
Share
Reddit
Vote
Email
10 Shares

RTL-SDR Based Coherent Multichannel Receiver

YO3IIU has written a post on his blog showing how he was able to create a coherent multichannel receiver using several RTL-SDR dongles all running on a single clock source.

To do this he used a CDCLVC1310-EVM board which provides up to 10 clock outputs and then connected four of the clock outputs to the clock inputs of four separate RTL-SDR dongles. He then uses a GNU Radio program to correlate the signals from each RTL-SDR stick.

Recently we have seen two applications of an RTL-SDR based coherent multichannel receiver used in passive a radar systems here and here.

Coherent Multichannel Receiver based on the RTL-SDR
Coherent Multichannel Receiver based on the RTL-SDR
Tweet
Share
Reddit
Vote
Email

Transmitting DVBT HDTV from a Raspberry Pi to an RTL2832U

Over on his blog, OZ9AEC has uploaded a post showing how he was able to create a live HDTV transmitter out of a Raspberry Pi, a Raspi Cam module and a UTC DVB-T Modulator adaptor. As he does not want to interfere with commercial DVB-T broadcasts, he sets the module to transmit at 1.28 GHz, aka the 23 cm licenced ham radio band.

On the RTL2832U dongle side, he modified the RTL2832U Linux DVB-T drivers (not the SDR drivers) to work on the 1.3 GHz band. The intention of this camera is for it to fly on a rocket mission. In the YouTube video below he has uploaded some sample footage with the RTL2832U dongle receiving the stream from 300 meters away.

Rocketcam 1 test 3 (20140531_142625)

Tweet
Share
Reddit
Vote
Email

Transmitting ADS-B with a HackRF and Receiving it with an RTL-SDR

Over on YouTube user Jiao Xianjun has uploaded a video showing how he was able to transmit an ADS-B signal from his HackRF One and receive it using an RTL-SDR with dump1090. He transmits a low power signal which shows a fake plane flying over the Senkaku islands.

Important Note: While this warning is also on the video we feel that we should re-emphasize that you should never transmit anything at 1090 MHz unless you are authorized to do so and are in a controlled RF environment.

ADS-B out by HACKRF and received by rtl-sdr + dump1090

Tweet
Share
Reddit
Vote
Email

Signal Mapping using RTLSDR Scanner and GPS on an iOS Device

Recently we posted how RTLSDR Scanner has been updated to allow interfacing with a GPS device. This allows you to make signal strength maps by driving around and recording both signal strength and GPS location together.

As most people don’t have a dedicated GPS device, Reddit user soooooil has put together a short guide on how he was able to use his iPhone as the GPS device and interface it with RTLSDR Scanner.

RTLSDR Scanner with iOS GPS device.
RTLSDR Scanner with iOS GPS device.
Tweet
Share
Reddit
Vote
Email

New RTL_POWER Based Wideband RTL-SDR Scanner GUI

Rtl_power is a command line program that can do a very wideband frequency scan by quickly tuning through 2 MHz chunks of bandwidth and recording radio power values.

Now a new GUI frontend for Windows rtl_power called rtl panorama has been released which simplifies the use of the command line tool. To use it download rtlpan.exe from the sourceforge page and then copy the rtlsdr.dll, libusb-1.0.dll and rtl_power.exe files from the official Osmocom librtlsdr download to the same directory as rtlpan.exe.

You can hover over each of the controls to see a tool tip explaining which each button does.

Recently a similar rtl_power GUI was released and shown in this post. There is also the more featured python based RTLSDR Scanner that is not based on rtl_power which does a similar job. However, the rtl_power based GUIs appear to be much faster at scanning.

New rtl_power GUI called rtl panorama.
New rtl_power GUI called rtl panorama.
Tweet
Share
Reddit
Vote
Email

RTL-SDR based Passive Multistatic RADAR used to Track Aircraft

Over on YouTube user Ben Silverwood has uploaded a video showing the results of his RTL-SDR passive radar. The passive radar works using two RTL-SDR dongles receiving a DAB radio tower’s radio waves that are reflected off the aircraft. On the video you are able to see the aircraft radar blip on the animated Matlab plots.

Previously we posted about another similar passive radar project in this post.

Low cost RTL-SDR passive multistatic DAB radar.

Tweet
Share
Reddit
Vote
Email

YouTube Review of the DX Patrol 100 kHz to 2 GHz SDR Receiver

The DX Patrol 100 kHz to 2 GHz SDR receiver appears to be a custom built RTL-SDR with upconverter built in. It is made by CT1FFU who is also known to be a good manufacturer of upconverters for the RTL-SDR. The DX Patrol SDR can be bought for 79 Euros at CT1FFU’s website. It’s features are as follows:

  • Ultra Wide-band Coverage SDR Receiver
  • Full coverage reception form 100KHz to 2GHz SDR
  • Independent antenna inputs for Shortwave and VHF
  • USB computer connection ( mini usb)
  • Very High dynamic range receiver
  • Low noise pin-diode band switch
  • Accurate and efficient band filters
  • Very clean audio reception
  • SMA golden antenna connectors
  • LED power and band indication
  • 40MHz local oscillator for HF conversion
  • DBM balance diode ring mixer
  • Small size board
  • Freeware software
  • Up to 3.2 M Sample rate.
Ultra Wide band SDR Receiver 100KHz to 2GHz
Ultra Wide band DX Patrol SDR Receiver 100KHz to 2GHz

We aren’t sure how this compares to a standard RTL-SDR with conventional upconverter, or direct sampling mode and we also aren’t sure about the truthfulness to their very high dynamic range claims as the RTL-SDR is known to have dynamic range that isn’t what could be called very high (8 bits ~ 50 dB).

Over on YouTube user OfficialSWLchannel has uploaded a video review. OfficialSWLchannel gives a generally positive review of the hardware.

DX Patrol SDR Receiver Review and Observations

Tweet
Share
Reddit
Vote
Email