Modifications in this fork:
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Automatically pauses recording if signal is below the squelch threshold.
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m key mutes audio instantly (recording is not affected). Adjust volute to resume.
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Signal level is displayed with a bar. Hover mouse to read numerical value.
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Clicking signal bar sets squelch level.
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PgDn/PgUp moves through the list of saved preset stations.
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Shift-PgDn begins (or ends) scanning through preset stations. Scanning stops when signal is above preset squelch level and resumes when signal drops below squelch level for a while.
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Export/Import preset list includes the squelch setting for each station.
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Clicking on the "Squelch" heading enters or leaves MONITOR mode, where squelch is temporarily set to zero to monitor frequency.
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f/F key moves to the frequency display for editing (this is in the original help file, but didn't work).
Radio Receiver
An application to listen to broadcast FM and AM radio from your Chrome browser or your ChromeBook computer using a $15 USB digital TV tuner.
What is this
Radio Receiver is a Chrome application that uses an USB digital TV receiver to capture radio signals, does FM and AM demodulation in the browser, and plays them through your computer's speakers or headphones. This is called SDR (Software-Defined Radio), because all the radio signal processing is done by software running in the computer.
Radio Receiver is 100% written in JavaScript, but is nevertheless fast enough that it can run on a 2012 Samsung ChromeBook laptop at full quality.
Features
- Stereo FM.
- Scan for stations.
- Record what you hear on the radio.
- Built-in bands:
- International and Japanese FM bands.
- Weather band (US and Canada).
- Medium Wave AM (requires an upconverter).
- Free-tuning mode to use the program as a multi-band radio and listen to anything: short wave, air band, marine band, etc.
- Supported modes: Wideband FM, Narrowband FM, AM, SSB.
Compatible hardware and software
Radio Receiver was written to work with an RTL-2832U-based DVB-T (European digital TV) USB receiver, with a R820T tuner chip. You can easily buy one for $15 or less by searching for [RTL2832U R820T] on your favorite online store or web search engine.
You can use this application on a ChromeBook, or on any other computer running a Chrome browser. Just install it using the Chrome Web Store or any other mechanism, plug in your USB dongle, and click on the icon to start the Radio Receiver application.
To listen to Medium Wave and Short Wave radio, you need an upconverter connected between your antenna and the USB dongle. This upconverter shifts the signals up in frequency so that they can be tuned by your dongle. You can find upconverters for sale by searching for [SDR upconverter] on your favorite online store or web search engine.
Support
If you'd like to talk about Radio Receiver, or have any bug reports or suggestions, please post a message in the radioreceiver Google Group.
Acknowledgements
Kudos and thanks to the RTL-SDR project for figuring out the magic numbers needed to drive the USB tuner.
If you want to experiment further with Software-Defined Radio and listen to more things using your $15 tuner, you can try the various programs listed on rtl-sdr.com.