# ExpressLRS (ELRS) “Telemetry Lost” Warning While Still Flying: Ultimate Fix Guide
If you are flying an ExpressLRS (ELRS) setup and your radio suddenly screams **”Telemetry Lost”**—yet you still have full control of your FPV drone—you are experiencing one of the most common issues in modern FPV systems.
This guide will walk you through why this happens, how to troubleshoot it, and the exact steps to eliminate this annoying warning.
## Why Does “Telemetry Lost” Happen?
ExpressLRS operates using asymmetric link power. The power your transmitter sends to the receiver (Uplink) is typically much stronger (e.g., 250mW, 500mW, or even 1W) than the power the receiver can send back to the radio (Downlink/Telemetry), which is often limited to 10mW or 50mW.
When the drone flies further away, the weak 10mW telemetry signal drops out before the control link does. The radio warns you “Telemetry Lost,” but you can still safely fly because your control link (Uplink) is still solid.
### Uplink vs. Downlink Power Comparison
| Link Type | Power Output | Range Expectation | Drop-out Priority |
|—|—|—|—|
| Control (Uplink/TX) | 100mW – 1000mW | 10km – 30km+ | Drops last |
| Telemetry (Downlink/RX) | 10mW – 50mW | 1km – 3km | Drops first |
## How to Fix and Optimize ELRS Telemetry
Here are the most effective ways to fix or manage the “Telemetry Lost” warning.
### 1. Adjust Telemetry Ratio in the LUA Script
The Telemetry Ratio dictates how often the receiver sends telemetry packets back to your radio.
– A ratio of `1:128` sends telemetry very infrequently.
– A ratio of `1:2` sends it constantly, which can bottleneck the link at long ranges.
– **Fix:** Set your Telemetry Ratio to `Std` or `1:64` for freestyle/long-range flying.
### 2. Boost Receiver Telemetry Power (If Supported)
Some premium ELRS receivers support variable or higher telemetry output (up to 100mW). Check your receiver specs. If you are constantly flying long-range, upgrading your receiver is the best permanent fix.
### 3. Disable the Voice Warning in EdgeTX / OpenTX
If you know your control link is safe and you just want the radio to stop yelling at you during mid-range flights:
1. Go to your Radio’s **Model Setup**.
2. Navigate to **Telemetry** page.
3. Find the **”Disable Telemetry Alarms”** toggle and check it. (Note: Only do this if you rely solely on OSD for Link Quality and RSSI).
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## Upgrade Your ELRS Setup
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## Video Guide: ELRS Telemetry Explained