Adafruit Feather RP2040 RFM69 Packet Radio - 868 or 915MHz [RadioFruit and STEMMA QT] : ID 5712 : $19.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Overview | Adafruit RFM69HCW and RFM9X LoRa Packet Radio Breakouts | Adafruit Learning System
Companion Website for ARRL Book Ham Radio for Arduino and Picaxe
Send text messages over ham radio with the HamMessenger | Arduino Blog
Cellphone-free Texting - IEEE Spectrum
Arduino KISS TNC | Mobilinkd
ARDUINO PROJECTS
Hamshield: Arduino meets amateur radio - YouTube
Building an Arduino APRS Tracker (ham radio) - Exhibition / Gallery - Arduino Forum
ArduTrx - a 2-meter-band ham radio transceiver with Arduino - element14 Community
Arduino for Ham Radio: A Radio Amateur's Guide to Open Source Electronics and Microcontroller Projects: ARRL Inc., Glen Popiel KW5GP: 9781625950161: Amazon.com: Books
HamShield Puts Your Arduino On The Radio | Hackaday