1. QRP Cluster - https://qrpcluster.com/
2. Hamdashboard - https://github.com/VA3HDL/hamdashboard/
3. Software-Defined Radio for Engineers, 2018 - https://www.analog.com/en/resources/technical-books/software-defined-radio-for-engineers.html
4. Journal of the constructor’s club (Hot Iron #125) - https://www.w4npn.net/hot-iron-directory/
5. RSGB Logbook: Explorer - http://uarl.org.ua/index.php/novini/1121-100-richchya-vikhodu-v-efir-pershoji-amatorskoji-stantsiji-zi-lvova
73 de UT2AB
