Kodi is a media player and entertainment hub program that is used to manage digital video collections and music. It is used mostly on TV’s together with a home theater PC, or Raspberry Pi 3, but also runs on Android and iOS. It can be thought of as more fully featured smart TV software.
Over on Tom’s Radio Room Show (TRRS) on YouTube Tom has uploaded a video showing how to use SDR# together with Vasili’s Fast Scanner plugin. Fast Scanner is a plugin for SDR# that allows you to use SDR# as a wide band scanner. Essentially this quickly scans through multiple ~2 MHz chunks of bandwidth, and automatically tunes to any active signals.
In his video Tom shows the Fast Scanner plugin in action, shows how to use it, discusses a bit about how it works and also shows what all the features are.
In his submission he shares a tutorial that explains the theory behind the PAL analog video standard. He explains the different components of the PAL signal, including the luma (black and white part), frame rates, and modulation. He then goes on to explain how color is encoded onto the PAL by using Quadrature Amplitude Modulation (QAM).
Finally in the files section marble also supplies us with the GNU Radio flowgraph which can be used to transmit PAL video with a HackRF.
Earlier in April we posted about Hannes Fasching (OE5JFL)’s work in detecting pulsars with an RTL-SDR. Thanks to Steve Olney (VK2XV), administrator of the Neutron Star Group for pointing out that there are actually several amateur radio astronomers who are using RTL-SDR dongles for pulsar detection.
A pulsar is a rotating neutron star that emits a beam of electromagnetic radiation. If this beam points towards the earth, it can then be observed with a large dish antenna and a radio, like the RTL-SDR. Pulsars create weakly detectable noise bursts across a wide frequency range. They create these noise bursts at precise intervals (milliseconds to seconds depending on the pulsar), so they can be detected from within the natural noise by performing some mathematical analysis on the data. Typically a few hours of data needs to be received to be able to analyze it, with more time needed for smaller dishes.
One problem is that pulsar signals can suffer from ‘dispersion’ due to many light years of travel through the interstellar medium. This simply means that higher frequencies of the noise burst tend to arrive before the lower frequencies. Mathematical de-dispersion techniques can be used to eliminate this problem enabling one to take advantage of wideband receivers like the RTL-SDR and other SDRs. The more bandwidth collected and de-dispersed, the smaller the dish required for detection.
Over on the Neutron Star Group several amateur pulsar detection projects are listed, and entries denoted with the “^” symbol make use of the RTL-SDR. Below we show a brief overview of those projects:
Andrea Dell’Immagine (IW5BHY)– Based in Italy Andrea often uses a 3D corner reflector antenna which is equivalent to a 2.5 meter diameter dish to observe pulsars in the 70cm band (~420 MHz). The antenna is in a fixed position so he can only detect pulsars that drift into the beam width of the antenna. With this antenna, a 0.3dB NF LNA, an RTL-SDR and de-dispersion techniques he’s been able to detect the Pulsar B0329+54 which is 2,643 light years away with an integration time of about 3 hours.
Andrea (IW5BHY)’s 3D Corner Reflector Pulsar Detection Antenna.
Hannes Fasching (OE5JFL) – Based in Austria Hannes has a 7.3M dish that he uses for pulsar detection with his RTL-SDR. With this large dish he’s been able to receive 22 pulsars at both 70cm (424 MHz), and 23cm (1294 MHz) frequencies. With such a large dish, detecting a strong pulsar like B0329+54 only needs less than a minute of integration time.
Mario Natali (I0NAA) – Based in Italy Mario uses a 5M dish to observer pulsars at both 409 MHz and 1297 MHz. Combined with a low noise figure LNA and his RTL-SDR he’s been able to receive the B0329+54 pulsar with an integration time of about 2 – 2.5 hours.
Mario Natali (I0NAA)’s 5M Dish
Michiel Klaassen – From the Dwingeloo Radio Observatory in the Netherlands Michiel has used their large 25M dish and an RTL-SDR to detect B0329+54 at 419 MHz.
Peter East & Guillermo Gancio–Peter and Guillermo have used the large 30M dish at El Instituto Argentino de Radioastronomía (IAR) in Argentina and an RTL-SDR to detect the Vela pulsar (B0833-45) at 1420 MHz.
In terms of hardware required, from the above projects we see that you’ll need an RTL-SDR dongle (other more costly SDR’s could also be used), a dish as large as you can get (along with some sort of dish pointing system), a low noise figure amplifier (0.5dB or less is desired) to be placed right by the dish, a few line amps if the cable run is long and perhaps a filter if you are seeing interference from terrestrial signals.
An overview of software for detecting pulsars with the RTL-SDR can be found over on the Neutron Star Groups software page. Essentially what you need is an analysis program which can work on the raw IQ data that is collected by the RTL-SDR and dish antenna. This software ‘folds’ the data, looking for the regular noise bursts from the pulsars. The output is data that can be used to create a graph indicating the spin period of the pulsar, and thus confirming the detection.
Graph showing the half-period of B0329+54. 350 * 2 = 700 ms which is about what matches on the B0329+54 Wikipedia page.
RadarBox.com is an ADS-B aggregator which is very similar to other aggregators like FlightAware.com and FlightRadar24.com. These services use ADS-B data provided from volunteers all around the world to create a live worldwide snapshot of current air traffic. The data is then used by airlines, airports, aerospace companies, as well as enthusiasts and regular people to track aircraft and estimate arrival times.
Typically contributors to these services use an RTL-SDR combined with a Raspberry Pi as the receiver. Some sites also use their own proprietary hardware, but they seem to be slowly falling out of favor as the RTL-SDR solution tends to be cheaper and more effective.
Over on our store we now have a limited amount of “Low Power V2” RTL-SDR dongles available for sale for $16.95 USD incl. free international shipping. These are dongles that were produced for the Stratux project which aims to provide a very low cost ADS-B and UAT receiver for small airplane pilots. These Stratux kits typically consist of a Raspberry Pi, two nano RTL-SDR dongles, a GPS dongle and a Android or iOS tablet. The two RTL-SDR dongles receive both 1090 MHz ADS-B and 978 MHz UAT which are decoded on the Raspberry Pi. The Raspberry Pi then sends the decoded aircraft position and weather data to the tablet via WiFi which is running commercial navigation software.
A full Stratux setup including: Raspberry Pi, two RTL-SDR nano dongles, GPS module, fan, and 1090 + 978 MHz antennas.
One issue that Stratux users continually run into, is that the Raspberry Pi is sometimes unable to power two or more RTL-SDR dongles. When running a Pi with two RTL-SDR dongles, a GPS dongle, and cooling fan the total power draw is above 1A which can cause power supply problems and glitching. By using a low power RTL-SDR these problems can be avoided by keeping the total current draw under 1A.
The Low Power V2 Stratux RTL-SDR’s draw about 160-170 mA, whereas standard dongles draw about 260 mA, so that’s a saving of almost 100 mA. On battery power this current saving can mean a few hours more of operation. The Low Power RTL-SDR dongle achieves its lower current consumption by using a switch mode power supply instead of a linear regulator which is commonly used on most other RTL-SDR dongles. The trade off is that switch mode supplies are inherently RF noisy, so increased noise can be seen on the spectrum. Despite the increased noise, most applications like ADS-B are not significantly degraded. We have seen switch mode supplies used on some other RTL2832U dongles sold in the HDTV market as well. For example all the R828D based DVB-T2 dongles that we have seen use switch mode supplies as well, and also draw about 170 mA.
We think that these low power RTL-SDRs could be useful in other non-stratux related applications too. For example, they could be used on mobile Android devices. One of the key problems with Android usage is that RTL-SDR dongles tend to drain the battery quickly. They could also be used on solar and battery powered installations to help achieve longer run times. Or like with Stratux they could be used on a Raspberry Pi running other applications, to ensure that multiple dongles can be attached.
Currently we are selling these dongles for $16.95 USD with free international shipping included. Note that these dongles do not come with an enclosure (just a bare PCB), and they do not have a TCXO. Below is more information about these dongles.
Back in November 2016 we posted a review on the Low Power V1 dongles. Since then Chris (the man behind producing these dongles) has brought out the Low Power V2 models which improves upon V1 significantly. By switching to a 4-layer PCB the dongle is now much quieter in terms of RF noise produced from the switch mode power supply, and it also now runs significantly cooler. The dongle also now uses even less power and is more sensitive compared with V1.
Noise Floor Comparisons between four Nano styled dongles. NESDR Nano 2 (Blue), Generic Nano (Orange), Low Power V1 (Gray), Low Power V2 (Yellow).
In terms of heat produced and power used, the NESDR Nano 2 is the hottest and most power hungry, followed by the Generic Nano, the Low Power V1 and then the Low Power V2. For comparison the NESDR Nano 2 draws 1.362W of power, the generic nano 1.318W, the Low Power V1 1.003W, and the new Low Power V2 draws only 0.933W.
Over on YouTube user SignalSearch has uploaded a video showing and explaining the use of a W4OP magnetic loop antenna on a SDRplay SDR. On the video he explains what the W4OP loop is, and demonstrates it’s operation in SDR-Console with his SDRplay. The video description reads:
Experiment: Hookup the SDRPlay RSP 1 (SDR receiver) to the W4OP (Small Transmitting Loop). I’ve always wanted to try hooking up a loop to my SDRPlay. Though different from an active receive loop (one that has a Low Noise Amplifier), this loop can be used for transmitting @ QRP levels – but works great for shortwave listening too! For more info. please visit my website @ www.k5acl.net!
Following the success of the LimeSDR, the Lime team have started work on their next SDR project called ‘LimeNET’ which will eventually be released for crowdfunding on CrowdSupply. To be notified when the campaign is released you can sign up here.
The LimeNET SDR is essentially a high-end computer combined together with a LimeSDR board, and all placed in a small box. The goal is to create self contained base stations for cellular and IoT applications. LimeNET devices come in two flavors, the LimeNET Mini and the standard LimeNET.
LimeNET Mini
A software defined radio (SDR) small cell network in a box for mobile and IoT applications, based on an Intel i7 processor and the open source LimeSDR board. This combination makes it an ideal implementation for high data rate communication applications such as to 2-5G radio access to IoT nodes and much more.
Processor: Intel Core i7-7500U CPU 2-core 2.7/3.5 GHz
Memory: 32 GB DDR4 2133 MHz
Storage: 512 GB SSD
Connectivity: 1 x USB 3.1 type C, 1 x USB 3.1, 2x USB 3.0, 1 x Gigabit Ethernet
A software defined radio (SDR) high capacity network in a box for mobile and IoT applications, based on an Intel i7 processor and the open source LimeSDR PCIe card. It covers the same applications as the mini version for wide area networks.
Processor: Intel Core i7-6950X CPU 10-core 2011-3 140 W 3.0 GHz 25 MB Cache
Memory: 64 GB DDR4 2133 MHz
Storage: 1 TB SSD
Connectivity: 2 x USB 3.1, 4 x USB 3.0, 1 x Gigabit Ethernet
Confronted with flat revenues, spiralling infrastructure costs and massively escalating data demands, the telco industry is facing a crisis point. It needs exponentially more cost-effective solutions, as well as new revenue streams, and needs to find them quickly. Operators face a simple choice; either revise their business models, or lose market share to new incumbents.
Lime Micro and Canonical are looking to turn the mobile telephony business model on its head. Telco hardware is expensive, slow to develop, and has proven a ‘break’ to innovation in the industry. By ‘open sourcing’ Lime Microsystems’ 5G and IoT capable SDR base station design, Lime and Canonical are looking to effectively ‘commoditise’ network hardware and shift the value centre towards software.
LimeSDR-based base stations can not only run cellular standards from 2G or 5G, as well as IoT protocols like LoRa, Sigfox, NB-IoT, LTE-M, Weightless and others but any type of wireless protocol. Open source base stations allow R&D departments to try out new ideas around industrial IoT, content broadcasting and many more. Commoditised base stations allow any enterprise to run their own base station and get spectrum from their operators as a service. Base stations can have new form factors as well, like being embedded into vending machines or attached to drones.
“It’s clear that existing telco business models are quickly running out of steam,” commented Maarten Ectors, VP IoT, Next-Gen Networks & Edge Cloud, Canonical, “and that operators need to find new revenue streams. Together with Lime Microsystems, we’re looking to initiate a ‘herding’ behaviour that will usher in the age of the largely software-enabled telco network. Through its open sourced SDR design Lime will encourage a wide range of manufacturers to produce more cost-effective base stations. And, following enormous interest in our first crowdfunding initiative, we already have the critical mass of developers required to deliver the significant software innovation the industry requires.”
“This kind of model is, without a doubt, where the industry needs to go,” commented Ebrahim Bushehri, CEO, Lime Microsystems. “There are several reasons why Canonical’s heavy commitment in this project over the past couple of years has been so important. For one, Canonical shares our vision of an entirely software-enabled future for telco and IoT networks. Secondly, Canonical’s efficient, hyper-secure IoT OS Ubuntu Core is the perfect platform to enable this vision. Thirdly, this collaboration has helped us to gather the critical mass of developers required to kick-start the programme.”
Over 3,600 developers are currently involved in efforts to create apps, called Snaps, for LimeSDR, with several free and paid-for apps having already appeared on the open community LimeSDR App Store, as well as Lime’s invite-only app store, LimeNET.
LimeNET SDR-based wireless networks crowdfund - launching 27th April
