ARRL

Software Defined Radio

Introduction

Software Defined Radio attempts to place much or most of the complex signal handling involved in communications receivers and transmitters into the digital (DSP) style.  In its purest form, and SDR receiver might consist simply of an analog-to-digital convert chip connected to an antenna.  All the filtering and signal detection can take place in the digital domain, perhaps in an ordinary personal computer.  While there are still good reasons to use some analog components in high-performance gear, the SDR approach is becoming more common in Amateur Radio.

Articles

  • A DSP-Based Audio Signal Processor
    QEX September 1996, pp. 8-13
  • Linux, Software Radio and the Radio Amateur
    QST October 2002, pp. 33-35
    How software radio technology might revitalize experimentation in Amateur Radio
  • A Software-Defined Radio for the Masses by Gerald Youngblood, AC5OG
    This series describes a complete PC-based, software-defined radio that uses a sound card and an innovative detector circuit.
    Part 1 QEX Jul/Aug 2002, pp. 13-21
    Part 2 QEX Sep/Oct 2002, pp. 10-18
    Part 3 QEX, Nov/Dec 2002, pp. 27-36
    Part 4 QEX, Mar/Apr 2003, pp. 20-31
  • Linrad: New Possibilities for the Communications Experimenter by Leif Åsbrink, SM5BSZ
    Discussion opens with analog versus digital RF-input techniques and attendant performance considerations.
    Part 1
    Part 2
    Part 3
    Part 4
    Part 5
  • An All-Digital SSB Exciter for HF appeared in the May 2008 issue of QEX, pages 3-10. James Ahlstrom N2ADR’s transmitter uses an FPGA  and software. 

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