1. DCT (Double sideband and CW Transceiver) - http://www.ozqrp.com/DCTindex.html
2. S-Meter Standard - https://www.qsl.net/i1kfh/homebrew/utilities/taratura_smeter.htm
3. EME (Earth-Moon-Earth) communication (user guide) - http://www.in3eci.it/bbb/file_content/fl523.pdf
4. YL3BU: Сборщик RSS-лент - http://www.yl3bu.lv/aggregator/C21UF?page=4
5. Tran Max BF2 M3 repair (Ремонт та налаштування антени від Tran-Max BF2-M3) - https://www.youtube.com/watch?v=iaImBUW-f8k
