You bought a Radiomaster Boxer or TX16S and the default model template feels incomplete. No pre-arm checks, no audio callouts, no telemetry screens — you’re flying blind with a radio that can do far more. EdgeTX is the most powerful FPV radio operating system available, but its default setup assumes you’re flying a foam plane. Here’s how to configure it for quads.
Model Setup: The Quad Template That Works
Create a new model and set it up once — then clone it for every quad. The template approach means every quad gets your switches, callouts, and failsafes without reconfiguration.
Essential Model Settings
Internal RF: Set mode to CRSF (ExpressLRS). If your module is external (Crossfire, 4-in-1), configure under External RF instead. Channel range: CH1-CH16. The default CH1-CH8 works for most quads, but CH9-CH16 gives you room for auxiliary functions like buzzer activation, turtle mode, or OSD profile switching.
ADC filter: Disabled. The default ADC filter smooths stick input — fine for planes, awful for quads. You want your stick movements to reach Betaflight with zero radio-side latency. In Model Setup → ADC Filter → Off.
Timer: Set Timer 1 to THs (throttle percentage), countdown from your typical flight time (4:00 for freestyle, 5:30 for cruising). Persistence: flight. This resets the timer when you power-cycle or change models — no manual reset between packs. Set an audio callout at 0:30 remaining.
Switch Mapping — The Standard Layout
There’s a de facto standard for FPV switch assignments. Deviate if you want, but the community standard means anyone can fly your quad:
- SA (3-pos, left shoulder): Arm — Up=Disarmed, Middle=Disarmed, Down=Armed. Two disarmed positions prevent accidental arming.
- SB (3-pos): Flight mode — Up=Acro, Middle=Horizon, Down=Angle.
- SC (3-pos): Beeper — Up=Beeper off, Middle=Beeper on (manual), Down=Beeper off.
- SD (3-pos): Turtle mode — Up=Disabled, Middle=Disabled, Down=Turtle mode active (momentary logic via EdgeTX).
Pre-Arm Logic with Logical Switches
Pre-arm safety is EdgeTX’s killer feature for quads. A logical switch that requires throttle at zero AND a specific switch position before arming prevents hot-starts and accidental throttle-ups.
Setup: Logical Switches tab → L01: a<x, Thr, -95 (throttle below -95%), L02: AND, L01, SA↓ (throttle low AND arm switch down). Then in Special Functions: L02 → Override CH5, -100 (forces disarm when conditions aren’t met). This means the quad cannot arm unless your throttle is at absolute zero AND the arm switch is in the disarmed position first.
Add a switch warning: Model Setup → Preflight Checks → Switches → check SA (arm), SB (flight mode). EdgeTX will loudly refuse to transmit until these switches are in safe positions. No more accidental hot-starts.
Global Functions: Audio Callouts That Save Quads
Global Functions apply to every model, which is perfect for telemetry-based warnings you want on every quad.
Low RSSI/LQ warning: Global Functions → Telemetry:RSSI < 45 → Play Track "rssilow.wav", repeat 10s. For ExpressLRS, use LQ instead: Telemetry:1RSS < 70 → Play Track "rssilow.wav", repeat 10s. LQ is more reliable than RSSI on ELRS — an LQ below 70 means you’re approaching failsafe territory, regardless of what RSSI says.
Low battery: Telemetry:RxBt < 3.5 → Play Track "lowbatt.wav", repeat 15s. At 3.5V under load, you’ve got roughly 30-45 seconds before voltage cliff — this warning gives you time to bring it home.
Telemetry lost: Telemetry:TRSS == 0 → Play Track "telemko.wav", repeat 5s. No telemetry means no RSSI/LQ warning, which means you could failsafe without warning. This alarm is your safety net.
Telemetry Screens: What to Display
Configure two telemetry screens (Display → Screen 1 and Screen 2):
Screen 1 — Flight-critical: RxBt (receiver voltage), RSSI (or 1RSS for LQ on ELRS), VFAS (flight battery voltage from FC), Curr (current draw), Fuel (mAh consumed). Page through with the roller during flight.
Screen 2 — GPS (if equipped): GSpd (ground speed), Alt (GPS altitude), Hdg (heading), GPS (satellite count), Dist (distance from home). Critical for long-range flight when you can’t see the quad.
For each value, set a reasonable range so the display bar gives visual feedback. VFAS range: 3.3–4.35V (per cell), RSSI range: 0–100, Curr range: 0–40A for a 5-inch build.
Parameter Comparison: EdgeTX Display and Alert Options
| Feature | Configuration Location | Latency Impact | Battery Impact | Must-Have? |
|---|---|---|---|---|
| ADC filter disabled | Model Setup → ADC Filter | Removes ~3ms stick latency | None | Yes — fly without it once and you’ll never enable it again |
| Global Functions audio | Global Functions tab | None | ~1% per callout | Yes — LQ/RSSI warning has saved more quads than any other radio feature |
| Telemetry screens | Display tab | None | ~2-3% screen-on increase | For medium/long-range |
| Logical switches (pre-arm) | Logical Switches tab | None | Negligible | Yes — mandatory safety feature |
| Haptic feedback | Radio Setup → Haptic | None | ~5% increase | Nice-to-have for noisy environments |
| Lua telemetry script | SD card → Scripts/Tools | Adds ~50ms screen update delay | ~5% increase | Only for advanced ELRS configuration |
What Most Pilots Get Wrong
Mistake 1: Using stick arming without EdgeTX pre-arm logic. Stick arming (throttle down + yaw right) has zero hardware interlock. A bumped throttle stick in your bag arms the quad. EdgeTX logical switches give you a second layer of safety that stick arming alone doesn’t provide.
Consequence: Quad arms unexpectedly in transport or during handling. Usually just scares you. Occasionally puts a spinning prop into your hand.
Fix: Pre-arm logical switch that requires throttle at -100 AND a designated switch in the correct position. This is two-factor arming and it should be standard on every model.
Mistake 2: Leaving the ADC filter on. This is a ~3ms stick latency penalty that you feel as mush around center. Racing pilots especially notice it — the difference between hitting a gate and clipping it.
Consequence: Slightly delayed response, especially noticeable during fast stick reversals. You compensate with higher rates, which makes the quad twitchier without addressing the actual problem.
Fix: ADC Filter → Off. Test it: wiggle the sticks on the main screen with ADC on vs. off. The channel monitor updates faster with it off.
Mistake 3: Not cloning the model template. You set up one quad perfectly, then manually configure the next one from scratch. By model #4, your switch assignments have drifted and your global functions are inconsistent.
Consequence: Model #3 has the beeper on a different switch than Model #1. In a panic, you hit the wrong switch and the quad keeps flying away.
Fix: Clone your template model. EdgeTX: Model Select → long-press the template → Clone. Rename, re-bind, done. Every quad gets identical switch assignments forever.
⚠️ Regulatory Notice: The flight recommendations in this article should be followed in accordance with the latest 2026 drone regulations in your country or region. Always verify local laws regarding flight altitude, no-fly zones, remote ID requirements, and registration before flying. Regulations vary significantly between the FAA (US), EASA (EU), CAA (UK), CAAC (China), and other authorities. Some jurisdictions have specific requirements for transmitter output power limits — verify your EdgeTX RF power settings comply with local regulations.
Related Guides
Your radio is the first link in the control chain — make sure the receiver end is solid with our ExpressLRS Binding Methods guide. For the Betaflight side of switch configuration, see Betaflight Modes Tab Setup. And if you’re comparing radios before committing to EdgeTX, our FPV Radio Transmitter Showdown covers Boxer vs TX16S vs Tango 2.
Recommended Product
The Radiomaster Boxer with EdgeTX pre-installed is the best value FPV radio on the market in 2026. Full-size hall gimbals, ELRS internal module, USB-C charging, and EdgeTX out of the box — no firmware flashing needed. uavmodel.com stocks the Boxer in both ELRS and 4-in-1 variants, plus the AG01 CNC gimbal upgrade for pilots who want the best stick feel available.