An ELRS link is really two protocols back to back: an RF air protocol between the handset's TX module and the receiver, and a CRSF serial protocol between the receiver and the flight controller. Setup (bind phrase, domain) lives in ELRS Configuration; the OSD numbers live in RC Telemetry. This snippet is the wire- and …

Choosing a video system determines image quality, latency, range, and cost. There is no universal best — each system has a place. Analog How it works: Camera outputs composite video; VTX (video transmitter) broadcasts it on 5.8 GHz. Receiver decodes the analog RF directly. Pros: Lowest latency (sub-ms RF link; ~3–7 ms …