1. N6ARA TinyPaddle - https://docs.google.com/document/d/1g2HZdlzOzQvBfiCE5Kx2YWyRHl98gEyodCoGzTS_TIM/edit
2. Amateur Radio Software - http://www.vwlowen.co.uk/radio/files.htm
3. OH7SV: Active Ferrite Rod Antenna for HF - http://www.saunalahti.fi/hohtola/ham/active-ferrite-rod-antenna/active-ferrite-rod-antenna.html
4. LC Filter Design Tool (калькулятор для розрахунку значення схем LC-фільтрів) - https://rf-tools.com/lc-filter/
5. 425 Magazine - November 2021 Edition - https://www.425dxn.org/
