Category: Applications

Modifying the Outernet LNA for Iridium Reception

A few days ago we posted a review on the Outernet LNA which can can be used to help receive their new L-band service signal. Their LNA uses a filter which restricts the frequency range from 1525 – 1559 MHz as this is the range in which the Outernet signals are located.

By default this LNA cannot be used to receive Iridium because the pass band on the default SAW filter does not cover the Irdidium frequency band of 1616 – 1626.5 MHz. Over on Reddit, devnulling decided to experiment with one of these LNA’s and see if he could replace the default SAW filter to enable Iridium reception. In his post he shows how he removes the default SAW filter, and replaces it with a Murata SF2250E SAW filter, which is the same size, but has a center frequency of 1615 MHz and a bandwidth of 20 MHz. Iridium is used for data services like satellite pagers, and with the right tools can be decoded.

We are also curious to see if this LNA could be modified to be used with GOES reception, which occurs at 1692 MHz.

Note: For those who had trouble with obtaining international shipping on these LNA’s the Outernet store now supports USPS international shipping, and NooElec appear to now be selling them on their site directly. Their products can also still be obtained on Amazon for US customers.

Additional Note Regarding the Downconverter: Also, it appears that the Outernet downconverter prototype that we posted about back in May has unfortunately been discontinued indefinitely and will not enter mass production. For now the LNA is the best option for receiving their signal.

Outernet LNA Modified for Iridium Reception
Outernet LNA Modified for Iridium Reception

Receiving GOES LRIT Full Disk Images of the Earth and EMWIN Weather Data with an Airspy

Over on Reddit user devnulling has made a post showing how he was able to use his Airspy SDR to download full disk satellite images of the earth from the GOES satellite. In a separate imgur post he also shows that he was able to receive EMWIN weather data images from the same GOES satellite.

The Geostationary Operational Environmental Satellite (GOES) is a weather satellite placed in geosynchronous orbit (same position in the sky all the time) which is used for weather forecasting, severe storm tracking and meteorology research. It transmits full disk images of the earth on its Low Rate Information Transmission (LRIT) signal, and weather data images and text on its Emergency Managers Weather Information Network (EMWIN) signal. EMWIN is a service for emergency managers that provides weather forecasts, warnings, graphics and other information in real time.

In his post devnulling writes about receiving GOES:

GOES LRIT runs at 1691.0 MHz , EMWIN is at 1692.7 MHz and is broadcasted from GOES-13 and GOES-15. GOES-14 is currently in a backup position to take over in either fails.

FFT/Waterfall of LRIT + EMWIN – http://i.imgur.com/rgSIORv.jpg
http://www.n2yo.com/?s=36411|29155|35491

For the hardware side, it is recommended to use roughly a 1.2m or larger dish, depending upon how far north you are, you may need a 1.8m dish (larger the better). Repurposed FTA or C-band dishes are easy to come by and work well.

I made a 5 turn helical feed with some 12ga copper wire and a piece of copper plate, and used this calculator to design it – https://jcoppens.com/ant/helix/calc.en.php

Picture of my dish/feed setup: http://i.imgur.com/Q1ZBFrs.jpg

I have a short run of coax into the LNA/Filter box. The first LNA is a TriQuint TQP3M9037 which has a very low noise figure (0.3 dB NF and 22 dB gain at 1.7 GHz).

That is ran into a Lorch 1675 MHz filter (150 MHz pass band), then a LNA4ALL and another Lorch before going over a 30ft run of RG-6 to the SDR.

Picture of the LNA/Filter box – http://i.imgur.com/yt7SvFL.jpg

I am using @usa_satcom (twitter.com/usa_satcom, usa-satcom.com)’s LRIT Decoder and that feeds into XRIT2PIC to produce the images and other data streams. By default the decoder only works with the Airspy, but with a custom GNU Radio UDP block, it can be fed with other SDRs like the BladeRF/USRP/SDR Play. A regular R820T(2) RTL probably won’t work because of the higher frequency (rtls tend to not work above 1.5 GHz) and 8 bit ADC. I’m going to try and use the Outernet e4k to see if I can pickup the EMWIN signal in the near future.

EMWIN is broadcasted on 1692.7 MHz, along with being encoded in the LRIT stream at 1691 MHz. The 1692.7 MHz signal is stronger and narrower, so it is easier to pickup. For decoding EMWIN I used @usa_satcom’s EMWIN decoder that piped data into WxEmwin/MessageClient/Weather Message Server from http://weathermessage.com.

LRIT will contain the full disk images from GOES-15, and relayed images from GOES-13 and Himawari-8. It will also included zoomed in pictures of the USA, and northern/southern hemispheres. The images will be visible light, water vapor and infrared. The full disk images are transmitted every 3 hours, with the other images more often. EMWIN will contain other weather data, text, charts, and reports.

Full disk GOES-15 – http://i.imgur.com/tWlmNMW.jpg

Charts / images from EMWIN – http://imgur.com/a/tsn1K

Text data – http://pastebin.com/raw/ULJmSSTP

Zoomed in west coast USA LRIT – http://i.imgur.com/rzfB0SV.jpg

Northern Hemisphere LRIT – http://i.imgur.com/5tKtPmn.jpg

Himawari-8 LRIT – http://i.imgur.com/sVzikys.jpg

Himawari-8 LRIT – http://i.imgur.com/LBvpTD1.jpg

It seems as though it may be possible to receive LRIT and EMWIN signals with an RTL-SDR since the signals are at 1690 MHz, which should be covered by cooled R820T2 and E4000 dongles. The only hardware requirements would be a 1m+ dish, 1690 MHz L-band feed, and an LNA + filter.

In 2017 these satellites are due to be replaced by new ones that will use a HRIT signal, which will be about 1 MHz. New software to decode this signal will be required then, but we assume the same hardware could still be used as the frequency is not due to change significantly.

Please note that the decoding software is only available by directly contacting usa-satcom, and devnulling writes that you must have the proper equipment and be able to show that you can receive the signal first before attempting to contact him.

GOES Full Disk Image
GOES Full Disk Image
One of several received EMWIN images
One of several received EMWIN images

A New LabVIEW interface for RTL-SDR Dongles

Today LabVIEW and RTL-SDR user Albert Lederer wrote in to let us know that he’s created a new LabVIEW interface for the RTL-SDR. LabVIEW is a visual programming language which is used commonly by engineers and scientists to quickly build applications for things like product testing, system monitoring, instrument control etc.

Currently there is already a LabVIEW interface for the RTL-SDR available called sdrLab. However sdrLab uses rtl_tcp for communication which can cause poor responsiveness and issues with corporate firewalls. Albert’s solution is instead a wrapper for rtlsdr.dll which allows LabVIEW to gain direct access to the RTL-SDR.

On his post Albert has created a write up that explains how his driver works, and how it can be used with LabVIEW. Keep an eye on Alberts future posts, as he writes that he intends to post a part two, where he will show how to attach an RTL-SDR to an NI myRIO.

An FFT in LabVIEW
An FFT in LabVIEW

Review: Outernet LNA and Patch Antenna

Recently we posted news that Outernet had released their 1.5 GHz LNA, Patch Antenna and E4000 Elonics RTL-SDR + E4000/LNA Bundle. When used together, the products can be used to receive the Outernet L-band satellite signal, as well as other decodable L-band satellite signals like AERO and Inmarsat STD-C EGC. Outernet is a new satellite service that aims to be a free “library in the sky”. They continuously broadcast services such as news, weather, videos and other files from satellites.

EDIT: For international buyers the Outernet store has now started selling these products at http://store.outernet.is.

A few days ago we received the LNA and patch antenna for review. The patch antenna is similar to the one we received a while ago when writing our STD-C EGC tutorial, although this one is now slightly larger. It is roughly 12 x 12 cm in size, 100g heavy and comes with about 13 cm of high quality RG316 coax cable with a right angled SMA male connector on the end. The coax cable is clamped on the back for effective strain relief.

The Outernet patch antenna and LNA
The Outernet patch antenna and LNA

The LNA is manufactured by NooElec for Outernet. It amplifies with 34 dB gain from 1525 – 1559 MHz, with its center frequency at 1542 MHz. It must be powered via a 3 – 5.5V bias tee and draws 25 mA. The package consists of a 5 x 2.5 cm PCB board with one female and one male SMA connector. The components are protected by a shielding can. Inside the shielding can we see a MAX12000 LNA chip along with a TA1405A SAW filter. The MAX12000 (datasheet here) is an LNA designed for GPS applications and has a NF of 1 dB. It has a design where there are two amplifiers embedded within the chip, and it allows you to connect a SAW filter in between them. The TA1405A SAW filter appears to be produced by Golledge (datasheet here), and it has about a 3 dB insertion loss.

The Outernet L-Band LNA
The Outernet L-Band LNA
Inside the Outernet LNA
Inside the Outernet LNA

We tested the patch and LNA together with one of our V3 RTL-SDR Blog dongles, with the bias tee turned on. The LNA was connected directly to the dongle, with no coax in between. The patch antenna was angled to point towards the Inmarsat satellite. A 5 meter USB extension cord was then used to interface with a PC. The images below demonstrate the performance we were able to get.

http://OuternetSignal

Outernet Signal

http://OuternetSignalwith4xDecimation

Outernet Signal with 4x Decimation

http://AERO

AERO

http://STD-CEGC

STD-C EGC

The Outernet team writes that a SNR level of only 2 dB is needed for decoding to work on their signal. With the patch and LNA we were able to get at least 12 dB so this is more than good enough. Other signals such as AERO and STD-C EGC also came in very strongly. Even when not angled at the satellite and placed flat on a table it was able to receive the signal with about 5 dB’s of SNR.

In conclusion the patch and LNA worked very well at receiving the Outernet signal as well as AERO and STD-C EGC. We think these products are great value for money if you are interested in these L-Band signals, and they make it very easy to receive. The only minor problem with the patch antenna is that there is no stand for it, which makes it difficult to mount in a way that faces the satellite. However this issue can easily be fixed with some sellotape and your own mount.

In the future once the Outernet Rpi3 OS and decoder image is released we hope to show a demonstration and tutorial on receiving Outernet data.

Modifying the Outernet LNA for Iridium Reception

A few days ago we posted a review on the Outernet LNA which can can be used to help receive their new L-band service signal. Their LNA uses a filter which restricts the frequency range from 1525 – 1559 MHz as this is the range in which the Outernet signals are located.

By default this LNA cannot be used to receive Iridium because the pass band on the default SAW filter does not cover the Irdidium frequency band of 1616 – 1626.5 MHz. Over on Reddit, devnulling decided to experiment with one of these LNA’s and see if he could replace the default SAW filter to enable Iridium reception. In his post he shows how he removes the default SAW filter, and replaces it with a Murata SF2250E SAW filter, which is the same size, but has a center frequency of 1615 MHz and a bandwidth of 20 MHz. Iridium is used for data services like satellite pagers, and with the right tools can be decoded.

We are also curious to see if this LNA could be modified to be used with GOES reception, which occurs at 1692 MHz.

Note: For those who had trouble with obtaining international shipping on these LNA’s the Outernet store now supports USPS international shipping, and NooElec appear to now be selling them on their site directly. Their products can also still be obtained on Amazon for US customers.

Additional Note Regarding the Downconverter: Also, it appears that the Outernet downconverter prototype that we posted about back in May has unfortunately been discontinued indefinitely and will not enter mass production. For now the LNA is the best option for receiving their signal.

Outernet LNA Modified for Iridium Reception
Outernet LNA Modified for Iridium Reception

Receiving GOES LRIT Full Disk Images of the Earth and EMWIN Weather Data with an Airspy

Over on Reddit user devnulling has made a post showing how he was able to use his Airspy SDR to download full disk satellite images of the earth from the GOES satellite. In a separate imgur post he also shows that he was able to receive EMWIN weather data images from the same GOES satellite.

The Geostationary Operational Environmental Satellite (GOES) is a weather satellite placed in geosynchronous orbit (same position in the sky all the time) which is used for weather forecasting, severe storm tracking and meteorology research. It transmits full disk images of the earth on its Low Rate Information Transmission (LRIT) signal, and weather data images and text on its Emergency Managers Weather Information Network (EMWIN) signal. EMWIN is a service for emergency managers that provides weather forecasts, warnings, graphics and other information in real time.

In his post devnulling writes about receiving GOES:

GOES LRIT runs at 1691.0 MHz , EMWIN is at 1692.7 MHz and is broadcasted from GOES-13 and GOES-15. GOES-14 is currently in a backup position to take over in either fails.

FFT/Waterfall of LRIT + EMWIN – http://i.imgur.com/rgSIORv.jpg
http://www.n2yo.com/?s=36411|29155|35491

For the hardware side, it is recommended to use roughly a 1.2m or larger dish, depending upon how far north you are, you may need a 1.8m dish (larger the better). Repurposed FTA or C-band dishes are easy to come by and work well.

I made a 5 turn helical feed with some 12ga copper wire and a piece of copper plate, and used this calculator to design it – https://jcoppens.com/ant/helix/calc.en.php

Picture of my dish/feed setup: http://i.imgur.com/Q1ZBFrs.jpg

I have a short run of coax into the LNA/Filter box. The first LNA is a TriQuint TQP3M9037 which has a very low noise figure (0.3 dB NF and 22 dB gain at 1.7 GHz).

That is ran into a Lorch 1675 MHz filter (150 MHz pass band), then a LNA4ALL and another Lorch before going over a 30ft run of RG-6 to the SDR.

Picture of the LNA/Filter box – http://i.imgur.com/yt7SvFL.jpg

I am using @usa_satcom (twitter.com/usa_satcom, usa-satcom.com)’s LRIT Decoder and that feeds into XRIT2PIC to produce the images and other data streams. By default the decoder only works with the Airspy, but with a custom GNU Radio UDP block, it can be fed with other SDRs like the BladeRF/USRP/SDR Play. A regular R820T(2) RTL probably won’t work because of the higher frequency (rtls tend to not work above 1.5 GHz) and 8 bit ADC. I’m going to try and use the Outernet e4k to see if I can pickup the EMWIN signal in the near future.

EMWIN is broadcasted on 1692.7 MHz, along with being encoded in the LRIT stream at 1691 MHz. The 1692.7 MHz signal is stronger and narrower, so it is easier to pickup. For decoding EMWIN I used @usa_satcom’s EMWIN decoder that piped data into WxEmwin/MessageClient/Weather Message Server from http://weathermessage.com.

LRIT will contain the full disk images from GOES-15, and relayed images from GOES-13 and Himawari-8. It will also included zoomed in pictures of the USA, and northern/southern hemispheres. The images will be visible light, water vapor and infrared. The full disk images are transmitted every 3 hours, with the other images more often. EMWIN will contain other weather data, text, charts, and reports.

Full disk GOES-15 – http://i.imgur.com/tWlmNMW.jpg

Charts / images from EMWIN – http://imgur.com/a/tsn1K

Text data – http://pastebin.com/raw/ULJmSSTP

Zoomed in west coast USA LRIT – http://i.imgur.com/rzfB0SV.jpg

Northern Hemisphere LRIT – http://i.imgur.com/5tKtPmn.jpg

Himawari-8 LRIT – http://i.imgur.com/sVzikys.jpg

Himawari-8 LRIT – http://i.imgur.com/LBvpTD1.jpg

It seems as though it may be possible to receive LRIT and EMWIN signals with an RTL-SDR since the signals are at 1690 MHz, which should be covered by cooled R820T2 and E4000 dongles. The only hardware requirements would be a 1m+ dish, 1690 MHz L-band feed, and an LNA + filter.

In 2017 these satellites are due to be replaced by new ones that will use a HRIT signal, which will be about 1 MHz. New software to decode this signal will be required then, but we assume the same hardware could still be used as the frequency is not due to change significantly.

Please note that the decoding software is only available by directly contacting usa-satcom, and devnulling writes that you must have the proper equipment and be able to show that you can receive the signal first before attempting to contact him.

GOES Full Disk Image
GOES Full Disk Image
One of several received EMWIN images
One of several received EMWIN images

A New LabVIEW interface for RTL-SDR Dongles

Today LabVIEW and RTL-SDR user Albert Lederer wrote in to let us know that he’s created a new LabVIEW interface for the RTL-SDR. LabVIEW is a visual programming language which is used commonly by engineers and scientists to quickly build applications for things like product testing, system monitoring, instrument control etc.

Currently there is already a LabVIEW interface for the RTL-SDR available called sdrLab. However sdrLab uses rtl_tcp for communication which can cause poor responsiveness and issues with corporate firewalls. Albert’s solution is instead a wrapper for rtlsdr.dll which allows LabVIEW to gain direct access to the RTL-SDR.

On his post Albert has created a write up that explains how his driver works, and how it can be used with LabVIEW. Keep an eye on Alberts future posts, as he writes that he intends to post a part two, where he will show how to attach an RTL-SDR to an NI myRIO.

An FFT in LabVIEW
An FFT in LabVIEW

Review: Outernet LNA and Patch Antenna

Recently we posted news that Outernet had released their 1.5 GHz LNA, Patch Antenna and E4000 Elonics RTL-SDR + E4000/LNA Bundle. When used together, the products can be used to receive the Outernet L-band satellite signal, as well as other decodable L-band satellite signals like AERO and Inmarsat STD-C EGC. Outernet is a new satellite service that aims to be a free “library in the sky”. They continuously broadcast services such as news, weather, videos and other files from satellites.

EDIT: For international buyers the Outernet store has now started selling these products at http://store.outernet.is.

A few days ago we received the LNA and patch antenna for review. The patch antenna is similar to the one we received a while ago when writing our STD-C EGC tutorial, although this one is now slightly larger. It is roughly 12 x 12 cm in size, 100g heavy and comes with about 13 cm of high quality RG316 coax cable with a right angled SMA male connector on the end. The coax cable is clamped on the back for effective strain relief.

The Outernet patch antenna and LNA
The Outernet patch antenna and LNA

The LNA is manufactured by NooElec for Outernet. It amplifies with 34 dB gain from 1525 – 1559 MHz, with its center frequency at 1542 MHz. It must be powered via a 3 – 5.5V bias tee and draws 25 mA. The package consists of a 5 x 2.5 cm PCB board with one female and one male SMA connector. The components are protected by a shielding can. Inside the shielding can we see a MAX12000 LNA chip along with a TA1405A SAW filter. The MAX12000 (datasheet here) is an LNA designed for GPS applications and has a NF of 1 dB. It has a design where there are two amplifiers embedded within the chip, and it allows you to connect a SAW filter in between them. The TA1405A SAW filter appears to be produced by Golledge (datasheet here), and it has about a 3 dB insertion loss.

The Outernet L-Band LNA
The Outernet L-Band LNA
Inside the Outernet LNA
Inside the Outernet LNA

We tested the patch and LNA together with one of our V3 RTL-SDR Blog dongles, with the bias tee turned on. The LNA was connected directly to the dongle, with no coax in between. The patch antenna was angled to point towards the Inmarsat satellite. A 5 meter USB extension cord was then used to interface with a PC. The images below demonstrate the performance we were able to get.

http://OuternetSignal

Outernet Signal

http://OuternetSignalwith4xDecimation

Outernet Signal with 4x Decimation

http://AERO

AERO

http://STD-CEGC

STD-C EGC

The Outernet team writes that a SNR level of only 2 dB is needed for decoding to work on their signal. With the patch and LNA we were able to get at least 12 dB so this is more than good enough. Other signals such as AERO and STD-C EGC also came in very strongly. Even when not angled at the satellite and placed flat on a table it was able to receive the signal with about 5 dB’s of SNR.

In conclusion the patch and LNA worked very well at receiving the Outernet signal as well as AERO and STD-C EGC. We think these products are great value for money if you are interested in these L-Band signals, and they make it very easy to receive. The only minor problem with the patch antenna is that there is no stand for it, which makes it difficult to mount in a way that faces the satellite. However this issue can easily be fixed with some sellotape and your own mount.

In the future once the Outernet Rpi3 OS and decoder image is released we hope to show a demonstration and tutorial on receiving Outernet data.

An AIS Decoder for MATLAB and the RTL-SDR

RTL-SDR.com reader Mike wrote in to us today to let us know that he has released his AIS decoder for MATLAB and the RTL-SDR. MATLAB is a technical computing language used by many scientists and engineers in the world. Mike writes the following about his work:

Automatic Identification System (AIS) is a communication standard that is used by commercial and recreational maritime vessels to report a ship’s ID, position, course and other information. This data is used for collision avoidance, search and rescue and many other applications. AIS has the following characteristics:

  • Access protocol: Self-organizing Time Division Multiple Access (SOTDMA)
  • Transmission frequencies: 161.975 MHz and 162.025 MHz
  • Transmit Power: 2 W or 12.5 W
  • Modulation: Gaussian Minimum Shift Keying (GMSK)
  • Data Rate: 9600 bits per second

An AIS decoder that uses the RTL-SDR and MATLAB to capture AIS transmissions is posted on MATLAB Central, the MathWorks file sharing exchange. The decoder has three main components

  1. Software to connect MATLAB to the RTL-SDR and bring IQ data directly into the MATLAB workspace (http://www.mathworks.com/hardware-support/rtl-sdr.html)
  2. Demodulation and decoding algorithms to convert the IQ samples into bits and decode the AIS data (http://www.mathworks.com/products/communications/)
  3. A user interface to configure the RTL-SDR, launch the capture and decoding process, and display the decoded messages (http://www.mathworks.com/matlabcentral/fileexchange/57600-ais-decoder)

The MATLAB Central post includes MATLAB source code for the AIS decoder, captured data files from Boston and San Francisco, an app for easy configuration and operation of the decoder, and instructions for installing the RTL-SDR Hardware Support Package and AIS Decoder app.

If you want to learn how AIS works, and how to write a decoder, then a MATLAB example like this is an excellent resource.

New Outernet Products For Sale: E4000 RTL-SDR, L-Band Patch Antenna, L-Band LNA

Outernet is a new satellite service that aims to be a free “library in the sky”. They continuously broadcast services such as news, weather, videos and other files from satellites. Their aim is to provide up to date information to users in locations with little to no internet (rural, third world and sea), or in countries with censored internet. It may also be of interest to disaster preppers. Currently they have an active Ku (12 – 18 GHz, though due to be discontinued shortly) and C-band (4 – 8 GHz) satellite service, and now recently have their L-band (1.5 GHz) service active. The L-band signal is currently broadcasting at 1539.8725 MHz over the Americas, 1545.525 MHz over Europe/Africa/India and 1545.9525 MHz over Asia/Pacific.

To receive their L-Band service you will need an RTL-SDR capable of receiving 1.5 GHz, like a R820T/2 RTL-SDR (preferably at least passively cooled like our RTL-SDR Blog models as some R820T/2 units tend to fail at 1.5 GHz without cooling) or an E4000 dongle. You will also need an appropriate L-Band antenna and L-Band amplifier.

To help with these hardware requirements, Outernet have just released for sale an E4000 RTL-SDR with bias tee enabled ($39), an L-band satellite patch antenna ($24) and an L-Band LNA ($19). There is also a E4000 + LNA bundle ($49) available. The E4000 comes in a metal case, and has the bias tee always on. The LNA requires bias tee power and is also compatible with our RTL-SDR Blog units that have the bias tee. The patch antenna is tuned for 1525 – 1559 MHz and is the production version of the prototype antenna we used in our Inmarsat STD-C tutorial. Combined with an LNA we found that the patch antenna gives good performance and can also be used to receive other services such as Inmarsat STD-C and AERO. Currently shipping is only available within the USA, but they write that they will have international shipping available shortly.

EDIT: For international buyers the Outernet store is now started selling these products at http://store.outernet.is.

The L-Band Outernet signal decoders aren’t finalized yet, but we expect them to be released in a matter of days to weeks. They will have decoders available for the $9 CHIP computer and Raspberry Pi 3 platforms. They way it works is that you plug your RTL-SDR with L-band LNA and patch antenna connected into the CHIP or Raspberry Pi 3 which is running their customized image. The CHIP/Pi3 then broadcasts a WiFi access point which you can then connect to with any device, and access the files as they are downloaded. Once these decoders are released we’ll do a full tutorial on receiving the Outernet L-Band service with an RTL-SDR.

The Outernet L-Band Patch Antenna
The Outernet L-Band Patch Antenna
The Outnernet L-Band LNA
The Outernet L-Band LNA
The Outernet E4000 RTL-SDR in metal case with bias tee.
The Outernet E4000 RTL-SDR in metal case with bias tee.

Radio-Sky Spectrograph now supports the SDRPlay

Radio-Sky Spectrograph is a radio astronomy software program that integrates data over long periods of time and displays it as a waterfall. It is described by the author:

Radio-Sky Spectrograph displays a waterfall spectrum. It is not so different from other programs that produce these displays except that it saves the spectra at a manageable data rate and provides channel widths that are consistent with many natural radio signal bandwidths. For terrestrial , solar flare, Jupiter decametric, or emission/absorption observations you might want to use RSS.

Radio Sky Spectograph is compatible with the RTL-SDR via an intermediary program called RTL Bridge, and now it is also compatible with the SDRplay via another intermediary program written by Nathan Towne called SDRplay2RSS

In previous posts we showed how some amateur radio astronomers were able to capture noise bursts from the sun and from Jupiter with an RTL-SDR. In the SDRplay software release post and documentation that comes with the software Nathan shows how he was able to capture solar emissions and Jupiter bursts with the SDRplay.

SDRPlay2RSS
SDRPlay2RSS
Solar emissions received with the SDRplay and Radio-Sky Spectograph.
Solar emissions received with the SDRplay and Radio-Sky Spectograph.
Jupiter Noise Bursts with the SDRPlay and Radio-Sky Spectrograph.
Jupiter Noise Bursts with the SDRPlay and Radio-Sky Spectrograph.

GSM Sniffing: A Full YouTube Tutorial

Over on YouTube user Crazy Danish Hacker has been working on uploading an entire series on GSM Sniffing with an RTL-SDR. His series is explained in a slow and clear presenting style, and it starts at the very beginning from installing the RTL-SDR. The tutorial series is not yet complete, however he is uploading a new video almost daily. Presumably the series will end with showing you how to receive text messages and voice calls originating from your own cellphone.

So far he has shown how to install the RTL-SDR, identify GSM downlinks, install and use GQRX and kalibrate, locate nearby cell towers, install and use GR-GSM and how to extract the TMSI & KC keys from your cell phone. To obtain the TMSI & KC keys he shows us how to use an Android tool called usbswitcher which forces the phone to use its USB modem interface, from which the keys can be obtained.

The video below shows his teaser video on the series. Check out his GSM playlist to view the full series.

https://www.youtube.com/watch?v=uSPAAuBEBRs