Software Defined Radio

http://sdrforum.org/

DSP-10

http://www.proaxis.com/~boblark/dsp10.htm

Bob Larkin's DSP-10 2m SDR

RFSpace

http://rfspace.com

RFspace has a receiver SDR-14 good for 0-30 Mhz. It uses a USB 2.0 interface to the computer and has a Windows program. It's $1099.

He is also working on a software defined spectrum analyzer. 500-30 Mhz.

The software component called SpectraVue is available separately from MOEtronix

RTL-SDR

https://rtl-sdr.com

I have NooElec hardware.

TAPR

http://www.tapr.org/

TAPR has SDR kits that you can put together to form an SDR.

USRP/GNUradio

http://comsec.com/wiki?UniversalSoftwareRadioPeripheral

http://www.gnu.org/software/gnuradio/doc/exploring-gnuradio.html

http://www.ettus.com/ Ettus Research LLC - The source for the hardware

$700 for the basic board and enclosure

$100 - $275 for each RX/TX daughterboard

WaveCOM

http://www.wavecom.ch/

• W61PC is a PCI card. $7400
• W61LAN includes a computer. $9100

4 inputs, three 50HZ-25MHz and one 52.5 MHz – 87.5 MHz

This system has an onboard DSP

Seems like a closed box when it comes to software. "Source code material is available only to government authorities or official bodies and needs signing of a special license contract."

WinRadio

http://www.winradio.com/

WinRadio makes SDR receivers. roucghly $500 - $3000

As might be inferred from the name they require MS Windows on the host computer. They do have an SDK available so that you can write your own programs.

Links

http://www.dxzone.com/catalog/Technical_Reference/Software_Defined_Radio/