SDR per Tutti
https://www.qsl.net/ik8xoo/SDR.pdf
Digitale? Ok, ma cos'è?
https://www.qsl.net/ik8xoo/Digitale.pdf
Oscar 100 facile
https://www.qsl.net/ik8xoo/QO-100.pdf
https://www.qsl.net/ik8xoo/SDR.pdf
https://www.qsl.net/ik8xoo/Digitale.pdf
https://www.qsl.net/ik8xoo/QO-100.pdf