1. G4AON SSB Transmitter - https://www.qsl.net/g4aon/g4aon_ssb_tx/
2. Great Circle Maps - https://www.qsl.net/sm3gsj/
3. Automatic Position Reporting System for HF - https://www.sarcnet.org/aprs-for-hf.html
** USB Rig Interface - https://www.sarcnet.org/usb-rig-interface.html
4. Beverage switch-box - http://www.db9ex.de/html/beverage.html
5. Radioberry sofware - https://github.com/pa3gsb/Radioberry-2.x/wiki/Overview
** RADIOBERRY - HF SDR TRANSCEIVER PI HAT - https://www.youtube.com/watch?v=1zNWX85wa8Y
