Receiver Protocols
ExpressLRS (ELRS) is the modern standard — 2.4GHz or 900MHz, 1-4ms latency, over-the-air updates, $3-10 per receiver. CRSF (TBS Crossfire) offers premium 900MHz long-range. FrSky D16/D8 is legacy. PWM receivers for fixed-wing servos. Always match receiver protocol to transmitter module.
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Antenna Types & Placement
Linear wire antenna (2.4GHz): orient vertically, keep away from carbon fiber and VTX. T-style antenna (900MHz): position for best ground-facing orientation. Diversity receivers (two antennas) automatically select the stronger signal. Avoid running antenna near ESC wires or video transmitter.
Telemetry Features
Modern receivers provide downlink telemetry: RSSI (signal strength), battery voltage, current, GPS coordinates, altitude, and flight mode. ELRS telemetry at 1:2 or 1:128 ratio. CRSF telemetry is always-on. Telemetry enables voice alerts and logging on EdgeTX/OpenTX transmitters.
Wiring & Connection
Connect via UART (TX/RX) for CRSF/SBUS; 5V power from BEC. For ELRS, use the full UART (not inverter) and configure the port in Betaflight/PX4. Solder carefully — U.FL antenna connectors are fragile. Use heat shrink to secure connections and prevent shorts.
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