To do this he set up a laptop in his car with RTLSDR-Scanner installed and connected his RTL-SDR with stock antenna and a GPS receiver. After driving around for only 15 minutes he was able to get a triangulation heat map of reasonable accuracy.
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-SkyPipe is a souped-up strip chart program which plots signal strength over time. When getting its data from RTL Bridge, RSP is plotting the total power in the spectrum covered by the RTL receiver centered around its set frequency. While the raw values are proportional to power, you will have to apply a function via the RSP Equations feature to apply a calibration if you want absolute values. For signals that do not have significant spectral structure of interest, this would be the preferred way to plot the data.
If you are interested in manually decoding some unknown signals you may be interested in this write up as it discusses his entire journey including the failures he encountered along the way. Basically he records some packets using his SDR dongle, works out their bit patterns manually and then attempts to find correlations between the packets in an attempt to discover their structure. In the end his efforts are successful as he discovers that he is receiving a temperature sensor and is able to decode the temperature readings.
This week on the popular YouTube show Hak5, SDRSharp plugins are discussed once more amongst other topics. This time at around the 17 minute mark, Shannon discusses how to install plugins that do not have automated installers. For an example she shows how to install the Level Meter plugin.
Autonomous Boats, Hacker Printers And RTL-SDR Plugins, Hak5 1623
Over on YouTube user John Miller has uploaded a video showing an example of DSD+ decoding an NXDN96 voice signal. NXDN is a digital voice protocol by developed by Kenwood that is often used by public safety organizations.
John uses SDR# to receive the NXDN signal and then pipes the audio to DSD+ using Virtual Audio Cable for decoding.
Over on YouTube user Jiao Xianjun has uploaded a video showing a HackRF simulating an Estimote iBeacon which is being received by an iPhone. An Estimote iBeacon is a wireless beacon that uses Bluetooth Low Energy (BLE) and can be use to notify nearby mobile devices of the beacons presence. This can be used for many things like indoor positioning or by retail shops to for example alert owners of special coupons.
There are several levels to contribute at but the ideal contribution is the ‘Voter’ level at $50 USD. By contributing to the fundraiser at the ‘Voter’ level you will be able to have a vote on what features are to prioritized. It is also possible to contribute at a lower level of $10 USD and forego the voting perk.
The list of features to be implemented and the voting system can be found at igg.kmkeen.com. Important improvements will be made to the librtlsdr library, rtl_sdl, rtl_adsb, rtl_tcp, rtl_power and rtl_fm..
We hope that if you have enjoyed the RTL-SDR in some form you will contribute to this developer and help make this hobby an overall better experience.
Over on YouTube user Guilherme Dattoli Cirigliano Cortes has uploaded a video showing his use of the RTL-SDR in some MATLAB based cognitive radio experiments. Cognitive radio is a upcoming technology which aims to increase radio spectrum use efficiency by finding and using the intermittent periods of unoccupied frequency space.
The uploader explains his task below.
The fundamental task of each Cognitive Radio (CR) user in CR networks, in the most primitive sense is to detect the licenced users, also known as primary users, if they are present and identify the available spectrum if they are absent. This is usually achieved by sensing the RF environment, a process called spectrum sensing. Here we use one of the technique of spectrum sensing called energy detection.