1. Форум радіоаматорів України (QRP) - https://uarl.info/forum/index.php?PHPSESSID=5kkiiv720av91a0ut23bjjdb32&board=15.0
2. QRZUA.CLUB - сайт радиоаматорів України - http://www.qrzua.club/
3. BiQuad Antenna Calculator - https://buildyourownantenna.blogspot.com/2014/07/double-biquad-antenna-calculator.html
4. RCForb Client - https://play.google.com/store/apps/details?id=com.remotehams.rcforb.client
5. Satellite Yagi crossed 2m, 70cm - https://ve2ek-9q1ek.blogspot.com/2018/02/satellite-yagi-crossed-2m-70cm.html
** KEYS MORSE story - http://ve2ek-9q1ek.blogspot.com/2006/12/keys-morse-story.html
