Product overview
The Xingkai ELRS 2.5W TX High-frequency head is an ExpressLRS transmitter module for FPV drone control, identified as a 300Mhz unit. Its electronic architecture combines ESP32 and LR1121 main control ICs with an ESP8285 backpack chip. The hardware belongs at the remote-control transmitter interface; it is a radio module rather than a flight platform or airframe kit. Its power choices extend from 100mW to 2500mW, with five output levels and four refresh-rate options.
Integration requires a remote-control module interface that outputs CRSF signals, because the module accepts only Crossfire Serial Data Protocol signals in its default configuration. OpenTX configuration uses CRSF output and a LUA script for module control. Input voltage is specified in two overlapping forms, 5-8.4V(2S) and 5-12V(2S), without a configuration distinction between them. Those differing upper limits leave the permitted supply ceiling unresolved; neither range establishes a separate supplied hardware variant.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | Xingkai ELRS 2.5W TX High-frequency head |
| Product type and purpose | ExpressLRS transmitter module for FPV drone control |
| Frequency | 300Mhz |
| Output power | 100mW/250mW/500mW/1000mW/2500mW |
| Refresh rate | 25Hz/50Hz/100Hz/200Hz |
| Input voltage, first listed range | 5-8.4V(2S) |
| Input voltage, second listed range | 5-12V(2S) |
| Main control ICs | ESP32 + LR1121 |
| Backpack chip | ESP8285 |
| Accepted signal protocol | Crossfire Serial Data Protocol (CRSF) onlyDefault configuration. |
| Host interface requirement | CRSF signal output requiredRemote-control high-frequency-head interface. |
| Configuration and control | Configure CRSF signal output and use a LUA script to control the moduleOpenTX remote-control system. |
