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Skywave Linux v1.2
Software Defined Radio for Online Listening

skywavelinux-1.2.iso:
md5sum: 5f4e92c027ea79e308d543b6cc903e7a
sha1sum: 9d18c6a570019605180e514c59cc50e9ae5c8263

Welcome to the 1.2 update of Skywave Linux!  This is an operating system designed to provide access to a growing network of software defined radios all over the world.  With global SDR access, shortwave listeners can access broadcast, utility, amateur radio, military, and other signals from almost anywhere in the world - from state-of-the art radio servers.  All you need to do is boot Skywave Linux on a computer with internet access.

Why was Skywave Linux created?  The developer of this system was plagued by a lack of access to quality radio broadcasts due to his residence in a country practising tight media control and censorship.   In addition, software defined radio is an exciting way to experience the hobby of shortwave listening.  By connecting to remote radio servers on the internet, it is possible to enjoy bleeding edge radio operation without large antennas or setting up a station on-site.  Installing SDR software can be difficult for many computer users, and Skywave Linux eliminates the hassle of downloading, compiling, and configuring apps for the SDR servers on the internet.

Supported SDR Types

Three types of software defined radio are supported by Skywave Linux:

• RTL-SDR devices used on the local system. Just plug-and-play! CubicSDR is the graphical interface which receives AM / FM / SSB modes. Dump1090 (Mutability version) is for monitoring aircraft ADS-B transmissions. ADS-B mapping is available from Dump1090's built in webserver.


• HPSDR hardware, for internet accessible receivers, is covered by QtRadio. Several servers are online 24 hours a day, and cover spectrum from LF through low UHF. Performance is excellent from these servers, and the radio configuration options in QtRadio make for a "professional grade" operating experience.


• WebSDR servers are located all over the world and provide easy access to the global airwaves via web browser. In Skywave Linux, use the launcher to open Firefox at the WebSDR index page. Note that HTML5 is all one needs to enjoy clean, stable, AM / FM / SSB reception using this cutting edge technology. The servers at University of Twente (NL), K2SDR, New Jersey (USA), and G4FPH, Stafford (UK) are particularly good.

For decoding RTTY, CW, PSK, WSJT, WSPR, RDS, and other digital radio transmission modes, the Fldigi the WSJT applications are installed. Simply start the applicatio and tune in a signal on the waterfall to decode. In some cases it may be necessary to use the Pulseaudio Preferences or Volume Control applications to configure the audio (output from the LADSPA audio processor plugins, networked sound, etc).

It may sometimes be advantageous for users to encrypt their connections and / or change the IP address from which they access the internet. For that purpose, the Bitmask VPN application is installed. In addition, basic PPTP and OpenVPN connections are included in networking applet.

Usage and Installation

Use Skywave Linux as you would use any live Linux system:

• Burn it to a DVD and run it as a boot disc (slow).


• Create a bootable USB or SD card using Universal USB Installer or YUMI (Windows users).


• In Linux, create a bootable USB or SD card using Unetbootin.


• In Linux, simply install a bootloader and copy the iso file to a USB or SD card.

Technical Notes

Skywave Linux v1.2 is built on state-of-the-art Ubuntu 14.10, and uses the Unity desktop environment. Capabilities of Ubuntu are therefore capabilities of Skywave Linux: software updating, graphics, system resource management, etc.  Version 1.1 adds the Redsea RDS Decoder, improved Softrock SDR support, and several system refinements.  Although Skywave Linux is designed for easy use by radio operators with basic computer skills, the radio software is largely compiled from source code and can be updated by moderately skilled end users.

Acknowledgements

Skywave Linux thanks the talented developers who create Ubuntu, QtRadio, Cubic SDR, Dump1090, Fldigi, WebSDR, WSJT, and the many other components necessary for this distribution to exist. Skywave Linux also thanks the end users for selecting this distribution and hopes it is an asset to their radio monitoring endeavors.

Disclaimer

Some parts of the world suffer from governance by regimes restricting the human right to freedoms of speech, including radio or electronic emedia access. If you are in such a restrictive place, and subject to punishment for listening to foreign media, military communications, or other signals available through Skywave Linux, you do so at your own risk. Be careful and do not get caught! Use a VPN to encrypt your internet activity. Shield and disguise your RTL-SDR hardware from rats and snitches. Skywave Linux, its developers and distributors, are not responsible for the monitoring activities of end users. We will never discourage accessing the network of software defined radio servers, but do encourage self-protective measures by anyone living under restrictive regulation.

Changelog

Version 1.2:
        Activated ZRAM kernel module for better performance
   Adjusted settings in QtRadio
   Added stations to Rhythmbox

Version 1.1:
        FM Broadcast RDS decoding via Redsea
        Added WSJT / WSPR weak signal digimodes
        Added Selectable WebSDR List
        Improved Softrock support in QtRadio

Version 1.0:
        Ubuntu 14.10 base system, kernel 3.16.0-23-generic
        Firefox 33
        LibreOffice 4.3
        QT Radio / GHPSDR3-Alex 04/26/2015
        CubicSDR 0.1.3
        Fldigi
        Dump1090-Mutability v1.14-25
        Bitmask 0.8