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	Software-defined radio - Wikipedia, the free encyclopedia
		Software radios have significant utility for the military and cell phone services, both of which must serve a wide variety of changing radio protocols in real time.
		The hardware of a software-defined radio typically consists of a superheterodyne RF front end which converts RF signals from and to analog IF signals, and analog to digital converter and digital to analog converters which are used to convert a digitised IF signal to and from analog form.
		The basic arrangement of the radio receiver used an antenna feeding an amplifier and down-converter (see mixer) feeding an automatic gain control, which fed an analog to digital converter that was on a computer VME bus with a lot of digital signal processors (Texas Instruments C40s).
	en.wikipedia.org /wiki/Software_radio (1785 words)

	Software-defined radio -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-22)
		Software radios have significant utility for the military and (Click link for more info and facts about cell phone) cell phone services, both of which must serve a wide variety of changing radio protocols in real time.
		Real software radios solve this problem by using a (A kitchen utensil that is used for mixing foods) mixer and a reference (Generator that produces sonic oscillations or alternating current) oscillator to (Click link for more info and facts about heterodyne) heterodyne the radio signal to a lower frequency.
		The software modules may run on different ((computer science) the part of a computer (a microprocessor chip) that does most of the data processing; the CPU and the memory form the central part of a computer to which the peripherals are attached) CPUs, so synchronization of the data flow is also important.
	www.absoluteastronomy.com /encyclopedia/s/so/software-defined_radio.htm (1945 words)

	Learn more about Software radio in the online encyclopedia. (Site not responding. Last check: 2007-10-22)
		A Software radio performs significant amounts of signal processing in a general purpose computer, or a reconfigurable piece of digital electronics.
		To cope with the distortion, most digital radios use a software package to produce an inverse-distortion in the signal, so that the trnasmitted signal is more precise.
		The goal was to produce a radio for the U.S. Army that could operate from 2 MHz to 2 GHz, and operate with ground force radios (frequency-agile VHFFM, and Sincgars), Air Force radios (VHFAM), Naval Radios (VHFAM and HFSSBteleprinters) and Satellites (microwaveQAM).
	www.onlineencyclopedia.org /s/so/software_radio.html (1561 words)

	Guardian Unlimited Technology \| Technology \| Radio active revolution
		In a positive move, the first handheld software radio was unveiled in Washington in May. Instead of specialist radio hardware, a software radio uses a simple receiver to throw the entire contents of a range of frequencies into computer memory, where software - and not hardware - does the signal processing.
		Software radio transmitters have the potential to allow anyone, with cheap PC equipment and an antenna, to set up their own radio or television stations.
		In the era of software radio, many people think this is nonsense: when both the transmitters and the receivers can be instantly upgraded to increasingly improved transmission standards, interference ceases to be a problem.
	technology.guardian.co.uk /online/story/0,3605,994679,00.html (1226 words)

	Read about Software-defined radio at WorldVillage Encyclopedia. Research Software-defined radio and learn about ... (Site not responding. Last check: 2007-10-22)
		radio that can receive and transmit a new form of radio protocol just by running new software.
		heterodyne the radio signal to a lower frequency.
		The software architecture identified standard interfaces for different modules of the radio: "radio frequency control" to manage the analog parts of the radio, "modem control" managed resources for modulation and
	encyclopedia.worldvillage.com /s/b/Software_radio (1640 words)

	Area of Expertise
		Software radio, SWR (or software defined radio, SDR), is a radio, whose channel modulation waveforms are defined in software.
		At the moment, the driving force of software radio development is the coexistence of several parallel mobile communications systems (like GSM, WCDMA and WLAN).
		The benefits of the software radio concept for various parties of the mobile communications community are multiple.
	www.vtt.fi /tte/rd/software-radio/Swr-radio.htm (434 words)

	Software Radio
		Software radio is the art and science of building radios using software.
		By radio, I mean any kind of device that intentionally transmits or receives signals in the radio frequency (RF) part of the electromagnetic spectrum.
		Free software developers, operating for the most part under a different set of constraints, are free to design new systems that challenge pre-exising assumptions and business plans.
	www.comsec.com /software-radio.html (662 words)

	Blog Software
		Also Blog Software MT and RU is a collection of opinions by different people regarding competing suites - which is better for specific purpose.
		John Hiler says this is a type of weblog publishing that requires software installation to your PC.
		Radio Userland News and Discussion Groups have been very excited about the partnership that lets Radio users be in the Salon community and the Radio community.
	radio.weblogs.com /0107846/stories/2002/10/03/blogSoftware.html (3766 words)

	Software Radio (Site not responding. Last check: 2007-10-22)
		This type of software radio is expected to be a key technology in several application scenarios of wireless communications.
		Simply speaking, a software radio is a wireless communications device in which some or all of the physical layer functions are implemented in software.
		In order to move as an industry from level one to level two of software radio flexibility and affordability, higher quality RF access and better partitioning of the systems and software for modular plug-and-play services and support are needed.
	www.iis.ee.ic.ac.uk /~frank/surp99/article2/mshh97 (1493 words)

	GNU Radio - GNU FSF Project
		GNU Radio is a collection of software that when combined with minimal hardware, allows the construction of radios where the actual waveforms transmitted and received are defined by software.
		Joe Mitola says, "A software radio is a radio whose channel modulation waveforms are defined in software.
		The receiver, similarly, employs a wideband Analog to Digital Converter (ADC) that captures all of the channels of the software radio node.
	www.gnu.org /software/gnuradio (460 words)

	White-papers \| Articles \| Technical papers \| Software defined radio (Site not responding. Last check: 2007-10-22)
		Software-Defined Radio (SDR) is a rapidly evolving technology that is receiving enormous recognition and generating widespread interest in the telecommunication industry.
		Over the last few years, analog radio systems are being replaced by digital radio systems for various radio applications in military, civilian and commercial spaces.
		A radio system built using SDR technology extends the utility of the system for a wide range of applications that use different link-layer protocols and modulation/demodulation techniques.
	www.wipro.com /insights/softwareradio.htm (326 words)

	Salon.com Technology \| Radio Free Software
		It's the vision that elicited a beatific smile from Alan Turing, a Bela Lugosi-like cackle from John von Neumann, and a cannabis-tinged giggle from 1970s-era PC creators: Imagine a universal machine, a computation device capable of mimicking the functionality of any other machine.
		At its most basic level, GNU Radio is an attempt to do for radio-software developers what the original GNU Project did for Unix developers -- that is, provide a common set of nonproprietary tools that can be ported from one device to the next.
		Viewed against this backdrop, GNU Radio is a hacker's version of the preemptive strike.
	www.salon.com /tech/feature/2002/12/18/gnu_radio (833 words)

	Building a Linux/RTAI based software radio (Site not responding. Last check: 2007-10-22)
		The demo software creates a radio carrier in the "long wave" radio spectrum, using a task running under RTAI to turn parallel port data lines on and off at a fast rate.
		When you activate the software radio demo from the menu (option 1 or 2), a task is started which toggles the data lines on the printer port at a rate of 30,600 times per second, which creates a 15.3KHz square wave signal on the parallel port data lines.
		Not a good general practice for radio transmitters, because it results in an infinite number of harmonics, but handy for this demonstration since it provides thousands of places on your dial where you can receive the signal generated by the RTAI demo.
	www.linuxdevices.com /articles/AT3239582376.html (1309 words)

	Software-Defined Radio
		The analog portions of the software-defined radio are kept to a minimum, allowing the radio to become a cellular telephone, a GPS receiver, an amateur packet radio, or any other sort of radio transmitting or receiving device.
		The GNU Software Radio is a code base of free software that performs digital signal processing using a personal computer and freely available RF receiver front-end designs.
		Since the system utilizes open-source software and a standard PC under Linux, the GNU Software Radio receiver is an ideal platform for learning and experimenting with SDR concepts.
	www.ncassr.org /projects/sdr.html (551 words)

	SDR Forum FAQs (Site not responding. Last check: 2007-10-22)
		Software Defined Radio (SDR) is a collection of hardware and software technologies that enable reconfigurable system architectures for wireless networks and user terminals.
		The radio is implemented using hardware components only and cannot be modified except through physical intervention.
		SDRs provide software control of a variety of modulation techniques, wide-band or narrow-band operation, communications security functions (such as hopping), and waveform requirements of current and evolving standards over a broad frequency range.
	www.sdrforum.org /faq.html (925 words)

	Radio Mobile WEB Site (Site not responding. Last check: 2007-10-22)
		Radio Mobile software is a copyright of Roger Coudé VE2DBE.
		Radio Mobile is dedicated to amateur radio and humanitarian use.
		Radio Mobile software is free but you can help...
	www.cplus.org /rmw/english1.html (86 words)

	Morse code and Ham radio software from Nu-Ware
		This is a single minded Morse code ham radio software program with just one aim...to help you ace the F.C.C. code test.
		NuTest 2.3 ham radio software is a complete XP compatible training package that will help you obtain or upgrade your FCC Amateur Radio Licence by passing the written theory tests.
		A unique feature of this ham radio software is a set of links that take you from each question to technical explanations for every single answer, pages of useful formulea, math hints and everything else you need to gain a pass grade at any level.
	www.nu-ware.com (507 words)

	Downloadable Software
		WPS is a combination of hardware and software that automatically switches off your computer when no satellite passes are happening.
		Antenna and radio control for the Kansas City Tracker, as a 32-bit DLL for use with 32-bit applications under Windows 95.
		This package includes all the software used by the AO-40 command stations in their day to day determination of the spacecraft's attitude, and 40 pages of illustrated user documentation in PDF format.
	www.amsat.org /amsat/ftpsoft.html (6064 words)

	Ham Radio Software
		AddOn for MixW2 --- MW2Log is a AddOn for MixW2 software.
		TRX-Manager -- Yaesu, Icom, Kenwood and TenTec Radios
		RTTY Loop Software -- From Marc I. Leavey, M.D. RTTY and PSK31 with Soundcard -- From DL4RCK
	www.ac6v.com /software.htm (2538 words)

	Embedded Linux powers "first hand-held software radio"
		According to Vanu, unlike traditional hardware radios, which are limited to one specific type of communication service, "software radio" technology enables a single wireless device to implement multiple radio standards and frequency bands, thus eliminating the need for multiple hardware radios when communication with multiple radio services is required.
		The photo on the left shows an early prototype of Vanu's iPAQ Software Radio, whereas the current version (shown on the right) has the added radio transceiver built into a standard iPAQ expansion pack and implements the signal processing natively on the XScale processor.
		An interesting introduction to software radio, including an overview of GNURadio, a free framework for software radio, is available here (PDF download).
	www.linuxdevices.com /news/NS7890250038.html (450 words)

	Radio IP Software - Driving Innovation
		No matter what type of wireless data network you have, Radio IP MTG gives you continuous wireless connectivity, the security of a mobile VPN and the ability to connect to other networks with RadioRoam® wireless roaming.
		Radio IP MTG also provides the network management tools to make any wireless data network a breeze to administer.
		The Radio IP Software family of wireless data network products capitalizes on our years of experience in building software solutions for a variety of industry applications and networks.
	www.radio-ip.com (495 words)

	TAPR (Site not responding. Last check: 2007-10-22)
		Created to honor the late Doug DeMaw, W1FB--one of the most widely published technical authors in Amateur Radio history--the award is bestowed upon the author or authors of the best QST or QEX technical article during the prior year, as judged by the ARRL Technical Advisor group.
		His Amateur Radio interests lie in HF digital communications, hardware and software design, and an occasional HF contest.
		As part of the Texas Packet Radio Society, he designed the hardware and some of the protocols for the TexNet packet switching network, and has been involved in numerous TAPR projects.
	www.tapr.org (1364 words)

	Mac Ham Radio Software
		MacLoggerDX logs into your favorite Telnet or TNC DXCluster and as DX Spots are received, tunes your radio to the spot, looks up the call and displays the DX station on the real time grey line Map with distance and bearing from your station.
		If you decide to work the station, MacLoggerDX is ready to instantly add the QSO and your Radio's VFO information to your log and can swing your beam around to work the station Direct or Long Path.MacLoggerDX supports ADIF Import/Export which is fully compatible with eQSL.cc and the ARRL LoTW.
		EchoMac allows Amateur Radio Operators using MacOS X to access the Echolink system and is designed as a single user, single connect application.
	www.dogparksoftware.com /Macintosh_Amateur_Radio_Pr.html (483 words)

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