A clean-sheet layout: validity helpers at L1 to L4, then recording, battery and GPS in the order I use them. Plus a minimum-voltage readout that speaks punch-out sag while I am still flying.

ELRS control-link antennas are linearly polarised, not circular like video. Why one horizontal and one vertical on a true diversity receiver beats a single antenna, and why my telemetry already measures it.

The callouts come from the stock EdgeTX voice pack, not from anything I recorded. What to scrub from a model YAML before publishing it, and the positional sensor-index trap that makes a shared config misbehave silently.

A miscalibrated voltage reading does not look broken, it looks plausible. Why report_cell_voltage makes a vbat_scale error propagate twice, and what the 3S-to-4S move does to your alarms.

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 …

Modern RC links send telemetry back from the receiver to the transmitter and OSD. Three numbers dominate: RSSI, LQ, and SNR. They measure the same link from different angles — and knowing which one to watch prevents both false alarms and missed warnings. What Each Metric Measures flowchart LR TX([Transmitter]) -->|RF …