New for July 2025. Do you want to explore software designed radio on the cheap? This site will set you up. Cribbing from radiosystemdesign.com:
Essentially your web connection allows you to listen in and control an SRD remotely and the guide show you:
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Examples of web SDRs and where you can find others
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How to control kiwiSDR, which is one of the most common
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How to record IQ data for further processing
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Examples of processing recorded signals using GNU Radio
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Some of the dedicated decoders available via web SDRs
Learn more about this resource here. Use at your own risk, we did not actually try it!
https://radiosystemdesign.com/GettingStarted/
Software defined radio has become a buzz word.
Only problem is, the technology that is required is not completely ready to support all of the claims! The ideal SDR radio architecture (antenna + ADC/DAC) only exists in ideal designs due to current technology limitations. Antennas for different applications have different requirements for gain, polarization, frequency and bandwidth. As for ADC/DAC, according to Nyquist sampling criteria, in order for the signal to be accurately depicted in the digital domain, the incident signal needs to be sampled at twice its frequency. So a 1 GHz signal will need to be sampled at 2 GHz, or 2 x 10^9 samples per second. Note that more when more bits are required the sample rate goes down, and more bits are required for more dynamic range: each additional bit ideally adds 6 dB more dynamic range. At the moment most commercial converters sample with 6 to 24 bit resolution and produce less than 1x10^6 samples per seconds. Maybe in 10 years we'll get there.
For now we'll let Josh explain it. Whoever hires this guy is going to be well positioned for the next fifty years...
Josh explains SDR