1. QRP Ranger - https://portableuniversalpower.com/our-products/qrp-ranger/
** Commander 7200 - https://sites.google.com/site/w5uxhatmega328pkeyerkbd/homehttps://portableuniversalpower.com/commander-7200/
2. Iambino - Iambic Keyer for Arduino - https://github.com/AE9RB/iambino
- Download PDF Manual - https://github.com/AE9RB/iambino/raw/master/manual.pdf
3. Explore Software Defined Radio - https://radiohata.ru/transfer/4105-explore-software-defined-radio.html
4. Simple J-Pole for the 2m band (конструкція антени) - https://www.qsl.net/dl1gsj/html/jpole.html
5. UR3PDA: Довідник радіоаматора-інженера (ver.3) - http://qrz.km.ua/yak-staty-radioamatorom/item/368-dovidnyk-radioamatora