Software Defined Radio Definitionclevervia

Posted By admin On 22/08/21

If you do not currently have an SDR we have plenty of low-cost solutions available for sale. Terratec DVB-T USB Receiver & Low-Cost Software Defined Radio (SDR) – Realtek RTL2832U + Elonics E4000-Based — These DVB-T dongles have new-found popularity since it was discovered they can be used as very inexpensive software defined radios.

From The RadioReference Wiki

  1. Software-defined radio is a concept according to which RF communication is achieved by using software (or firmware) to perform signal-processing tasks that are typically performed by hardware. A software-defined radio (as in, the device itself) is an RF communication system that incorporates a significant amount of this software-based signal.
  2. 🙶Software-defined radio (SDR) is a radio communication system where components that have been typically implemented in hardware (e.g. Mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system.
  3. A WebSDR is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously.SDR technology makes it possible that all listeners tune independently, and thus listen to differentsignals; this is in contrast to the many classical receivers that are already available via the internet.

What is Software Defined Radio (or SDR)? Wikipedia gives a definition..

In short: an SDR is a radio with no IF, Modulator, or Demodulator stages as we generally understand those terms: a receiving RF preamp feeds directly into a (very fast) A-to-D converter, which is connected to a computer DSP/CPU to tune a signal and extract the modulated audio or data; on the transmit side, the CPU and DSP generate the modulation directly, and feed it to an RF power amp.

In the HF and ham world, it has appeared in 2 distinct phases; in use in high end amateur transceivers and receivers, and utilizing a PC as a controller, letting external software define how the SDR is addressed and utilized.

Software Defined Radio Wiki

The forum for this wiki can be found here

Here are some introductory articles on SDRs from These originally appeared in the Spectrum Monitor magazine;

Please see the following pages for further information;

Software Defined Radio Uses


You can find additional reviews and resources here;

  • Ham Radio Science many SDR and software reviews

SDRs that you can tune online can be found on our Live Tunable Receivers article


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  • Return to Decoding the SW Radiogram Broadcasts
  • Return to Shortwave Radiogram Gateway
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