1. QRP - K4ICY's Low-Power Station - http://www.k4icy.com/qrp.html
2. Universal VFO based on the Si5351 (PA0RWE) - https://pa0rwe.nl/?page_id=804
** Arduino Projects - https://pa0rwe.nl/?page_id=457
3. How to build your own radioless allstar node (Як створити власний безрадіометричний вузол Allstar) - https://allstarsetup.com/build-your-own-radioless-allstar-node/
4. Cokes, baylums and Transmidgeon land trainformers (презентація W5RH) - https://bvarc.org/Tech/Nov2020W5RH.pdf
5. Balanced ATU - https://www.creative-science.org.uk/atu.html
73 de UT2AB
