This book is aimed at amateur radio enthusiasts, electronic engineering students, and anyone interested in learning to use the Raspberry Pi to build electronic projects. With the addition of a low-cost upconverter device, an RTL-SDR can easily and effectively receive the HF bands. With such a simple setup it is feasible to receive signals from around 24 MHz to over 1.7 GHz. A basic system may consist of a USB-based RTL-SDR device (dongle) with a suitable antenna, an RPi computer, a USB-based external audio input-output adapter, and software installed on the Pi. The RTL-SDR devices have become very popular among hams because of their very low cost and rich features. Nowadays, anyone can purchase a Raspberry Pi computer and run almost all amateur radio software on the ‘RPi’, which is slightly bigger than the size of a credit card. Although much classical HF and mobile equipment is still in use by many amateurs, the use of computers and digital techniques has now become very popular among amateur radio operators.
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