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RTL-SDR community on Reddit

A subreddit dedicated to the RTL-SDR project and the low-cost software defined radio user community. "RTLSDR" is a term for certain USB digital TV (DVB-T) receivers that use the Realtek RTL2832U chip which it was recently discovered can function as general purpose software defined radio (SDR) receivers. Previously, SDRs had been far more expensive. We encourage discussion of all low cost SDRs, tools, techniques, signals, software, hardware, news, links, etc. Feel free to ask questions, start discussions, post news, articles, etc. We only request that you not discuss anything illegal here. (Subscribe via the link above, and post via the link lower down) Frequency range1 :22-2200 MHzCost of the most popular RTL2832+R820T dongles can range from $9-15 on ebay to $17-20 from local vendors. 1 depends on specific tuner (The Rafael Micro R820T covers 24-1766 MHz, and the elonics e4000 covers approximately 52-2200 MHz with a gap around 1100 MHz.) List of online sources here. Third Party:

Related:  GNU_RadioRadio-SDR-RTL

R820T Archives Over on the SDRSharp Yahoo group, HB9AJG has posted an interesting report in a PDF file containing some measurements (Note you will need to be a member of the group to download the file titled “Some Measurements on E4000 and R820 Tuners.pdf”. Here is a Direct Mirror of the file.) quantifying the performance of both the E4000 and R820T RTL-SDR DVB-T dongles. See the discussion in the Yahoo group here.

GNU Radio - WikiStart - Introduction¶ GNU Radio is a free & open-source software development toolkit that provides signal processing blocks to implement software radios. It can be used with readily-available low-cost external RF hardware to create software-defined radios, or without hardware in a simulation-like environment. It is widely used in hobbyist, academic and commercial environments to support both wireless communications research and real-world radio systems. GNU Radio is licensed under the GNU General Public License (GPL) version 3 or later.

kochmorse - Koch Morse Tutor for Linux KochMorse is a easy to use morse tutor (trainer) for Linux using the Koch-mehtod. It provides a clean and modern graphical interface. The current release (version 0.99.x) is full featured and stable. I've tested it under Fedora and Ubuntu and it works well. Ham It Up vs SDR UP 100 The Ham-It-Up and the Up 100 are the two cheapest shortwave adapters available: direct competitors at 50 USD (including shipping). For this review, I purchased the Ham-It-Up and received the Up-100 for free for testing. Shipping and customer service The Ham-It-Up comes from the States with tracked shipping; you get emails where it is, but when the package leaves the US no more tracking info available.

operation with a Realtek RTL2832U USB dongle DVB-T receiver | GNSS-SDR - An Open Source Global Navigation Satellite System Software Defined Receiver Introduction This article describes what is probably one of the cheapest ways for experimenting with real-life signals and GNSS-SDR. This is product from a combined effort of many people, so let us only mention (to our knowledge) the very original source, the V4L/DVB kernel developer Antti Palosaari, who discovered an undocumented operation mode for some USB DVB-T dongles based on the Realtek RTL2832U chipset, enabling them to be used as a cheap Software Defined Radio (SDR) front-end. The key feature is that the chip allows transferring raw I/Q samples to the host, that in principle is the responsible for DAB/DVB+/FM demodulation. This is great news for a GNSS software receiver, since it covers the targeted frequency bands.

Software Defined Radio for Mariners: Reducing electrical noise - You can use alu foil, but make sure it touches the metal part of the USB plug. - Remove the metal support from the USB extension cable on the end where you connect the RTL stick. This will eliminate noise picked up by the USB extension cable. - If you have a spare car battery, connect the metal part of USB plug to the negative terminal. - Mobile operation or no car battery? Wrap the center conductor of coax around the metal part of the USB plug, then place the stick in the middle of coiled coax. Testing setup Your antenna receives noise and signal. Without an antenna any signal received is by the RTL stick and the cables, and you do not want that.For this test: Nooelec RTL-SDR 820T stick, max gain, no antenna.

Amateur Radio Exam Generator - Spectrum Management and Telecommunications Amended April/2007 Amateur Radio Service Home Page a learning aid for prospective amateurs an administrative tool for accredited examiners Industry Canada is pleased to introduce an exam generator software package to facilitate the amateur examination process that our accredited examiners have taken on our behalf. This software package can produce a unique examination for either a basic or advanced amateur certificate according to the random selection criteria outlined in RIC -3 . It will also generate a worksheet, and it has an additional feature that allows self-testing on a home computer.

rtl-sdr – OsmoSDR DVB-T dongles based on the Realtek RTL2832U can be used as a cheap SDR, since the chip allows transferring the raw I/Q samples to the host, which is officially used for DAB/DAB+/FM demodulation. The possibility of this has been discovered by Eric Fry (​History and Discovery of RTLSDR). Antti Palosaari has not been involved in development of rtl-sdr. Specifications ¶ The RTL2832U outputs 8-bit I/Q-samples, and the highest theoretically possible sample-rate is 3.2 MS/s, however, the highest sample-rate without lost samples that has been tested so far is 2.56 MS/s. The frequency range is highly dependent of the used tuner, dongles that use the Elonics E4000 offer the widest possible range (see table below). GNSS SDR Toolkit for MATLAB® | ChameleonChips What is it? Are you involved in advanced wideband GNSS signals research using Software Defined Receivers? Then you know how frustrating it can be to crunch hundreds of Gigabytes of data using MATLAB. Sure, you could implement your algorithm in C or try to run it on a DSP or even get it to go realtime on an FPGA – but you don’t want to add three or more years to your graduation do you? Besides, all you want to do right now is develop your algorithm – not go down a path that ends up limiting flexibility. Hands down MATLAB’s flexibility can’t be beat.

embrtlsdr 1. Basic setup 2. Wireless access 1. To see in the new version of the osmocom rtl-sdr package the new TPC version, I decided to try to realize my idea about a small embedded rtl-sdr setup. Software Defined Radio (SDR) on the EzTV645 w/ RTL2382U and FC0013 | Due to much of my own issues with setting this USB dongle up, I thought it should take the time and write my own version of the installation. Take note that this installation is for Windows 7, and not linux (if that wasn’t already apparent). I will also list all of my references below, which may end up solving some problems people were having.

Radio Signal Identification Guide A guide to help you identify some amateur and utility digital radio signals and sounds which you may find on the frequency spectrum. I will be slowly adding more to this list over time. If you enable stereo mix and pass the sample audio to an appropriate decoding program the sample audio should be decodable for most samples. If you would like to suggest a modification or contribute a sample, please send a sample, waterfall image and information about the signal to, or post in the comments.