1. QDX and Fldigi on Debian Linux - https://dk1mi.radio/qdx-fldigi-linux/
** Notes on the QRP Labs QDX (Примітки щодо QRP Labs QDX) - https://dk1mi.radio/notes-on-the-qrp-labs-qdx/
2. Retro VFO - http://users.triera.net/zupanbra/Radioamater/Retro%20VFO.html
3. Universal VFO 10 KHz-160 MHz with quasi-analogue scale according to JF3HZB 2021 - https://www-kh--gps-de.translate.goog/vfo.htm?_x_tr_sch=http&_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=de&_x_tr_pto=wapp
4. Repeater Builder - https://www.repeater-builder.com/products/stm32-dvm.html
5. Forty2 - http://lpistor.chez-alice.fr/forty2s.htm
73 de UT2AB
