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In a Software Defined Radio, software performs key signal-processing tasks such as filtering and demodulation. The analogue front end and converter still determine which signals can be processed.

Translate ppm to hertz, assess a reference and distinguish frequency error from other drift.

SDR waterfall Wasserfall Simulation Spektrum spectrum

USB SDR receiver covering 1 kHz to 2 GHz for spectrum viewing and signal processing on a computer.

My Swiss-SDR project: three portals for public radio receivers, with a map, frequency search, browser listening and shared operator management.

USB SDR covering 100 kHz–1750 MHz: Q-branch direct sampling for HF, a TCXO and an SMA antenna input.

My radio equipment in detail: handhelds, scanners, SDR receivers, PMR and CB, with technical specifications, accessories and related guides.

From a silent speaker to an overloaded SDR: work through the receiving chain.

Radio meets software: Swiss-SDR and HB3YAQ’s projects from Lucerne. Receive signals, understand technology and experiment with ideas.

Understand amateur radio: lessons on SDR, digital voice, antennas, measurement, propagation and station practice, with examples and related calculators.

My collection spans handheld radios, scanners and SDR receivers through to PMR and CB equipment.

The SDR lab shows how an excessively narrow AM filter cuts into the sidebands.