1. VK3HN: Arduino si5351 VFO Controller Keyer - https://github.com/prt459/Arduino_si5351_VFO_Controller_Keyer
2. YAESU FT817 cat & digital modes interface - http://iw7ehc.altervista.org/interfacciaFT817_EN.htm
** ICOM radios microphone adapter - http://iw7ehc.altervista.org/interfacciamicroICOM_EN.htm
3. OpenWebRX web-based SDR receiver - https://www.openwebrx.de/
4. Beacon Monitor Station DL8LAS (Станція моніторингу маяка DL8LAS) - http://www.dl8las.de/
** KC2G HF MUF Propagation maps - https://prop.kc2g.com/
5. 80m/40m Dual-Band Vertical - https://www.dj0ip.de/vertical-antennas/80-40m-on-18m-pole/
