How far can I broadcast LoRa packets WITHOUT a radio? - LoLRa

check out this guy, doing something similar sending Lora packets without a radio - [VIDEO] "This video explores LoRaWAN communication using a microcontroller without a dedicated radio chip. CNLohr demonstrates techniques to transmit LoRa packets over surprisingly long distances, pushing the limits of inexpensive hardware. The project involves creative software and hardware interaction to generate signals at unexpected frequencies."

cnlohr is in his own league, this guy is bordering on genius. Dissatisfied with the state of the vendor SDK for CH32V003 microcontrollers (ultra-cheap RISC-V MCUs), he created his own [1], which is a pleasure to use. He also has a header-only RISC-V emulator that runs Linux (and Doom!) [2], and hacked an ESP32 to emit valid LORA frames with clever use of aliasing [3]. [1] [LINK] [2] [LINK] [3] [VIDEO]

In fact, it's so robust that even when your antenna is a piece of wire hanging off a GPIO of a microcontroller with absolutely no dedicated radio hardware, you can still get several km of range. Truly crazy stuff. [VIDEO]