1. Small QRP-GO-BOX powered by Raspberry Pi4, KX2 and TH-D74 - https://dl1gkk.com/small-qrp-go-box-powered-by-raspberry-pi4-kx2-and-th-d74/
** portable amateur radio station (go-box) - https://dl1gkk.com/portable-amateur-radio-station/
2. Трансивер STRP II своими руками #1 - https://www.youtube.com/watch?v=8Aqqp6Cx3-k
3. Чергові випуски The 144 MHz EME NewsLetter (Issue 04/2021 6 Apr 2021) - http://www.df2zc.de/downloads/emenl202104_final.pdf
** 432 and Above EME Newsletters (March 2021 VOL 51 #2) - http://www.nitehawk.com/rasmit/NLD/eme2103.pdf
4. FT8 & FT4 Polish Award Program (дипломна програма) -https://ft8sp.org.pl/news.php
5. LaboratoryW: Спиральная антенна на 433MHz. Часть I (конструктив) - https://www.youtube.com/watch?v=YPsrTB05Oy8
** Из новых комплектов в Ровно - https://www.youtube.com/watch?v=YR_Ll5xdJ5M
