1. QRP End Fed Tuner Kit - http://pgerhardt.blogspot.com/2010/09/qrp-end-fed-tuner-kit.html
2. 5 Amp Solar Charger Controller Circuit (Схема контролера сонячного зарядного пристрою на 5 ампер) - https://makingcircuits.com/blog/5-amp-solar-charger-controller-circuit/
3. MAGNETIC LOOP FOR 80m - 40m - https://www.qsl.net/hb9mtn/hb9mtn_magnet_80.html
4. End Fed Half Wave Antenna Coupler (EFHW) - https://m0ukd.com/homebrew/baluns-and-ununs/end-fed-half-wave-antenna-tuned-coupler-efhw/
5. Активний елемент антени DK7ZB 28 Ohm - https://www.youtube.com/watch?v=s0nD5yI9jts
