1. SW30+ 30 Meter CW Transceiver - http://www.k8iqy.com/qrprigs/sw30+/sw30+page.htm
2. PA0FRI: T-MATCH antenna tuner - https://pa0fri.home.xs4all.nl/ATU/Tmatch/T-match%20Eng.htm
** ZS6BKW ANTENNA - https://pa0fri.home.xs4all.nl/Ant/ZS6BKW/zs6bkw%20eng.htm
3. 160 meter antenna problems and solutions (Проблеми з 160-метровою антеною та рішення) - https://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/hr/1990/03/page49/index.html
4. Kenwood TS890S Mods (також mods IC 706mk2, IC 7100, IC 7300) - http://brucerichards.com/army/890s%20mods.htm
5. Win4IcomSuite for Icom Radios (version 1.430) - https://icom.va2fsq.com/
