Every programmer learns to count from zero. Betaflight agrees: AUX channels are 0-based, so AUX1 is 0 and AUX6 is 5. Type a few CLI lines and your fingers stop thinking about it. Count from zero. It's the rule the whole configurator seems to run on. Then I lost an evening to a VTX that flatly refused to output 400 mW, …

Antenna placement is one of the most overlooked range factors. A perfectly tuned ELRS link loses 10–20 dB when the antenna is oriented wrong — the equivalent of cutting TX power by 90%. Why Antenna Orientation Matters Omnidirectional antennas (dipoles, linear, RHCP/LHCP) have a radiation pattern shaped like a donut — …

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 …

Map a transmitter lever, wheel, or switch to cycle through VTX power levels in Betaflight. Useful for pit mode on startup, low power for close proximity flying, and full power for long range. How It Works Betaflight reads an AUX channel and maps PWM ranges to VTX power table indices. The VTX must be connected to the FC …