Tagged: rtl-sdr

Ghosts in the Air Glow HAARP Art Project: Transmitting Until March 28

The famous HAARP (High Frequency Active Auroral Research Program) antenna array will be transmitting again from March 25 - March 28, 2019. HAARP is an antenna array which is used to perform experiments on the Earth's ionosphere and thermosphere by transmitting HF RF energy into it. With an HF capable receiver like the RTL-SDR V3 it is often possible to receive these transmissions from some distance away. As HAARP only rarely transmits, it is an interesting signal to catch when it is transmitting.

HAARP (High Frequency Active Auroral Research Program)
HAARP (High Frequency Active Auroral Research Program)

The current set of experiments are being combined with an art project by artist Amanda Dawn Christie (@magnet_mountain). Amanda is an interdisciplinary artist working at Condordia University. On the project website she explains the project:

Ghosts in the Air Glow is an ionospheric transmission art project using the HAARP Ionospheric Research Instrument to play with the liminal boundaries of outer space.

Pairing air glow experiments in the ionosphere—false auroras creating soft, glowing spots in the sky—with SSTV images, audio and image signals articulated by artist Amanda Dawn Christie will be received and decoded via SDR (Software Defined Radio) equipment by amateur radio operators around the world, and streamed live online for audiences who do not have the equipment or expertise for reception.

She also talks about the project on a Concordia University article:

The first art transmission was sent earlier today, and if you missed it Amanda live streamed the signals being received on YouTube and the recording is available here. Future live streams will be available here. DK8OK has also posted about his reception on his blog.

Further transmissions are scheduled every day until March 28, and the transmissions schedule is available here. Each transmission consists of several 'movements', which consist of differing antenna array arrangements, frequencies being used, and signals being transmitted. If the text formatting of the movements is a bit difficult to read, Reddit user 
grink has formatted it into a nice table in his post. To follow the transmissions it would be also wise to follow Amanda on Twitter, where she is posting the most up to date transmission frequencies.

As to how the idea for this project came about, the Concordia University article writes:

The idea for the project came about when Christie met Christopher Fallen, the chief scientist at HAARP, at a hackers conference earlier this year. Fallen, who is an amateur radio operator, was intrigued by Christie’s proposition to use the IRI to create site-specific transmission art.

He agreed to open the facility to her, and when she gained backing from the Canada Council for the ArtsGhosts in the Air Glow officially became the first Canadian-funded project to take place at HAARP.

“Art and science are often seen as separate efforts but they actually share many of the same inspirations and techniques. I’m excited to see HAARP, a unique scientific instrument, used for a comparably unique artistic performance,” says Fallen.

“Amanda’s project will be a valuable contribution to the 50-year collection of scientific work in the field of ionosphere radio modification, and also to the brand new collection of artistic work using powerful high-frequency radio transmitters and the upper atmosphere — it’s art directed from the ground but created in space!”

Interdisciplinary artist Amanda Dawn Christie. Photo by Concordia University
Interdisciplinary artist Amanda Dawn Christie. Photo by Concordia University

If you prefer a video explanation of the project, YouTube user OfficialSWLchannel has prepared a video which is shown below.

HAARP tests and Ghost in the Air Glow from Amanda Dawn Christie

SigintOS: A Linux Distro for Signal Intelligence

Recently we've heard of a new Linux distribution called SigintOS becoming available for download. SigintOS is an Ubuntu based distribution with a number of built in signal intelligence applications for software defined radios such as RTL-SDRs and other TX capable SDRs like the HackRF, bladeRF and USRP radios.

The distro appears to be very well executed, with a built in GUI that grants easy access to the some common sigint tools like an FM and GPS transmitter, a jammer, a GSM base station search tool and an IMSI catcher. SigintOS also has various other preinstalled programs such as GNU Radio, gr-gsm, YatesBTS, wireshark and GQRX.

The OS also teases an LTE search and LTE decoder which to access requires that you get in contact with the creators, presumably for a licencing fee. Regarding an LTE IMSI catcher they write:

LTE IMSI Catcher is not myth!

Due to the nature of LTE base stations, the capture of IMSI numbers seems impossible. LTE stations use GUTI to communicate with users instead of IMSI. The GUTI contains the temporary IMSI number called T-IMSI. This allows the operator to find out who is at the corresponding LTE station who is authorized to query T-IMSI information.

Can the GUTI number be found?
Answer Yes!

How to find GUTI and T-IMSI numbers?
Can be found with the help of SigintOS …

For detailed information [email protected]

The image comes as a 2GB ISO file, and it's possible to run it in WMWare or VirtualBox.

SIGINTOS IMSI Catcher
SigintOS IMSI Catcher

QIRX SDR Beta 2.0.1.0 Released: Improvements to DAB Scanner, Recorder and Spectra Display

QIRX SDR is a multimode SDR program compatible with the RTL-SDR. One of its defining features is that it has a built in DAB+ decoder. Recently beta version 2.01 of QIRX SDR was released which has some scanner, recording and spectra display improvements. We note that the beta version appears to be a DAB decoder only, with no multi-mode features. The new features and improvements include:

Scanner:

  • Configurable w/r to the Muxes to be scanned and/or included in the usual set of Muxes being used.
  • New algo, considerably faster
  • "Scan forever" feature, interesting for DX-ers wishing to observe Muxes over a longer time, particularly together with TII logging.
  • Selectable waiting time after recognition of a Mux, for TII logging.

Recorders:

  • TII Recorder: File structure improved, now directly importable into Excel, with TAB as separator.
  • Audio Recorder (DAB+ only): Format selectable between WAV (as usual) and pure AAC (with ADTS headers). The latter allows for high-quality recordings compressed by at least a factor of 10 compared to WAV. The popular Foobar2000 app is able to play these files. Not seekable yet though, because embedding in a suitable container is not yet implemented.

Spectra:

  • CIR with different scales (Samples, Distance, Time)
  • Indication of the correlation peaks used for the "FFT Window" determination in the CIR spectrum.
QIRX SDR Beta 2.0.1.0
QIRX SDR Beta 2.0.1.0
 

Receiving Voice Communications From the Soyuz MS-12 Expedition to the ISS

On March 14 the Soyuz MS-12 spacecraft mission was launched and this carried three astronauts to the International Space Station (ISS). Back on the ground, YouTube creator Tysonpower was able to receive the voice communications of Russian cosmonaut Alexey Ovchinin while the Soyuz spacecraft was approaching the ISS. To do this he used an Airspy SDR and home made QFH antenna, and he notes that reception could just have easily been achieved with an RTL-SDR.

Tysonpower has uploaded a video explaining what he received along with a subtitled and translated recording of the communication. More information also available on his blog post.

[EN subs] Empfang von Cosmonaut Alexey Ovchinin im Soyuz MS-12

Conference Talk: Linux, Raspberry Pi, RTLSDR, LAME and Open Source (A Recipe For Responding to Natural Disasters)

The SCaLE conference on open source and free software was recently held on March 10 in Pasadena, California. One of the talks by Ben Kuo AI6YR was titled "Linux, Raspberry Pi, RTLSDR, LAME and Open Source (A Recipe For Responding to Natural Disasters)". This talk was streamed live, and is archived on YouTube.

In the talk Ben discusses how RTL-SDR's can be useful in disaster response by putting radio communications onto online audio streaming sites like Broadcastify. He notes how difficult it was for residents affected by the California wildfires to get up to date information on how close the fire was to their house from news stations and authorities. In contrast information on the internet came in much faster and more accurately. He notes in particular how listening in to firefighter radio communications via online streams uploaded by RTL-SDR users can give the fastest and most up to date information to concerned residents.

Ben also mentions how it can also useful to track the movement of fires via the ADS-B flight tracking data transmitted by fire fighting aircraft. By watching the aircraft movements the spread of the fire can be determined.

In the YouTube video stream, Ben's talk starts at about 3:31:00 and the video below should start at that time. The three other talks recorded in this stream are all ham radio related and may also be of interest to you.

Room 212 Sunday Mar. 10 - SCaLE 17x

Transferring Files via the BlockStream Satellite with Lightning Network Payments and RTL-SDR + Transacting Bitcoin over HF

The Blockstream satellite API is now live on the main Bitcoin network. Blockstream satellite is a project that aims to use geosynchronous satellites to strengthen the Bitcoin network by continuously broadcasting the Bitcoin blockchain all over the world. This allows people without internet access (or with censored internet) to receive Bitcoin. Setting up a Blockstream satellite receive station is a matter of building an RTL-SDR based receiver (or other GNU Radio compatible SDR) with a small satellite dish and LNB.

The API was also updated and this has enabled a feature that allows you to upload a file of up to 10 kB via the internet, which will then be transmitted via the satellites to anyone who is running a Blockstream RTL-SDR satellite receiver. Payment for the transmission is taken via the Bitcoin Lightning Network and transmissions appear to work on a priority basis, with larger payments receiving higher priority. The file is distributed to all receivers, so they note that private messages would need to be encrypted with public keys distributed to recipients in other ways. This service is similar to what the Othernet (prev. Outernet) network offered in the past with the ability to transmit data, tweets and APRS messages over their satellite network. We think that cheap small data satellite transmissions could have some interesting applications in remote control.

In related news on CryptoNewsZ it has been reported that a bitcoin lightning network transaction was completed over the 20M amateur radio band. The transaction was completed with the JS8 digital mode, which is similar to FT8 but designed for weak signal usage. The message was sent via the help of twitter, with @eiaine first sending money to @nvk via the internet. @nvk then sent the Lightning Network invoice over 21 JS8 messages via the 20M band to @eiaine who received it, thus confirming that the transaction was completed.

Demonstration of Two SatNOGS Rotators

Thank you to IZ5RZR for writing in and sharing his two SatNOGS rotator builds with usSatNOGS is an open source project that aims to make it easy for volunteers to build and run RTL-SDR or other SDR based RF ground stations that automatically monitor satellites, and upload that data to the internet for public access.

IZ5RZR writes that he's now made two rotators and one was modified to use a 5:18 stepper motor (which is upgradable to 50:1) to give more torque so that heavier antennas can be turned smoothly. His rotators are powered by a 12V battery charged by solar, and they can be controlled over WiFi with a PC/tablet/phone. He's also tested the rotators with a 24 dB parabolic grid antenna and found that the rotator could handle it even without a counterweight. He also notes that together with IK5XWA they've fixed a "Meridian Flip" bug in the firmware.

The video below shows the two rotators in action.

IZ5RZR Two SatNOGS Satellite Rotators

SignalsEverywhere Video: SDRAngel How to Receive Basics Tutorial

Over on his YouTube channel SignalsEverywhere, Corrosive has posted a new video tutorial explaining how to use the SDRAngel software for receiving signals in Windows. SDRAngel is a general purpose SDR program similar to programs like SDR#, HDSDR and SDR-Console, however it's layout and workflow is slightly different compared to other programs. SDRAngel also has some interesting features such as built in decoders for DMR, D-Star and Fusion digital voice signals and unlike most other general purpose SDR programs, SDRAngel is also capable of controlling transmit capable SDRs. Corrosive notes that he will discuss that feature in a future tutorial.

Corrosive's tutorial goes over the main points such as changing gain, changing sample rate, tuning to signals, and adding demodulators. In the video he uses an RTL-SDR as the receiver.

SDRAngel Tutorial - How to Receive Basics