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Run SPOT Run. Skill Level: Intermediate by Nate | April 06, 2012 | 36 comments Let's jump to the punch line: With a clear, open view of the sky, you can transmit small amounts of data (think text messages or 41 character tweets) across a low-orbit satellite network from nearly any surface of the earth.

Run SPOT Run

The SPOT Connect Satellite Messenger is easily controlled with a few serial commands. This opens the door to all sorts of remote data sensing and tracking projects. It's not cheap ($150 for the hardware, $100 a year for the service, $20 for the breakout board, $0.10 per message) and you won't be streaming YouTube, but it's a heck of a lot better coverage than cellular. Part 1 covers the serial interface requirements. Part 2 covers the tear down and reverse engineering required in this project. Part 1 - Serial Interface If you've got the breakout board and are eager to get started, here's information about the command structure. You can find example code on the Run SPOT Run github repo. Send Message: SI4735 AM & FM Receiver Shield. Replacement: None.

SI4735 AM & FM Receiver Shield

Unfortunately the Si4735 has been discontinued. This page is for reference only. Description: The Si4735 is the first digital CMOS AM/FM radio receiver IC that integrates the complete tuner function from antenna input to audio output. This feature-rich solution includes advanced seek algorithms, soft mute, auto-calibrated digital tuning, and FM stereo processing. The chip also incorporates a digital processor for the European Radio Data System (RDS) and the North American Radio Broadcast Data System (RBDS), including all required symbol decoding, block synchronization, error detection, and error correction functions. Now that we've mounted it on a shield, you can harness all of that sweet radio-playing power right from your Arduino. This board seems to get decent reception compared to other stereos around the office even using a simple wire antenna. SI4735 AM & FM Receiver Shield. Whistlers and Related Ionospheric Phenomena : Robert A. Helliwell. KeyStone Semiconductor Corp.

MonkeyBoard. GNU Radio - WikiStart - gnuradio.org. Introduction¶ GNU Radio is a free & open-source software development toolkit that provides signal processing blocks to implement software radios.

GNU Radio - WikiStart - gnuradio.org

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. DAB DAB+ FM Digital Radio Development Board. Specifications Overview Designed in Australia, the DAB+ FM Digital Radio Development Board provides a platform for developing and evaluating DAB+ and FM receiver. The board contains a Keystone T1_L4A_8290C DAB/FM module and a Microchip PIC18F14K50 microcontroller. The T1_L4A_8290C module is an ultra low power DAB/FM receiver module with the following features: ETSI EN 300 401 compliant receiverDAB/DAB+ sensitivity to -99dBm (typical) Decodes multiple audio services up to 256kbps without external RAM FM with RDS (*** RDS reception only available for station name, station text and genre and is subjected to certain condition of power level and frequency deviation)Combined antenna input for FM / Band3Support DAB L-Band reception (*** Although the Keystone module supports L-Band, the SMA connector has no connection to the L-Band pin, customer will need to solder a separate antenna and other passive components to make it work.)Serial control interface RoHS compliant.

VLF Whistler Reception. I painted my tin with gray hammertone paint and affixed a label to the lid.

VLF Whistler Reception

The circuit is built on a piece of polished copper clad circuit board sprayed with a light coat of clear Krylon to keep it shiny. All the ground connections are made directly to the copper and a couple of terminal strips hold most of the components. A battery compartment is formed with two pieces of copper clad board soldered in place as walls and a piece of foam rubber on the lid secures the battery. Just about any assembly technique should work fine so don't feel compelled to copy this approach. Super-Tiny VLF Receiver if you just can't wait to try something, this little receiver is for you! Naturalradiolab.com. Monitoring SID Events in VLF. Medicina Radio Observatory - Live data. Last 8 hours ULF activity, from 0.1 to 100Hz.

Medicina Radio Observatory - Live data

Picture updated every 15 minutes. FFT resolution 21 mHz, scroll time 40 seconds. Spectrogram in 1 hour strips, from 0.1 to 100 Hz. Soundcard Scope. Soundcard Oscilloscope deutsche Version Author: Christian Zeitnitz Main features: The PC based Soundcard Oscilloscope receives its data from the Soundcard with 44.1kHz and 16 Bit resolution.

Soundcard Scope

The data source can be selected in the Windows mixer (Microphone, Line-In or Wave). The frequency range depends on the sound card, but 20-20000Hz should be possible with all modern cards. The oscilloscope contains in addition a signal generator for 2 channels for Sine, Square, Triangular and Sawtooth wave forms in the frequency range from 0 to 20kHz.