This TCXO Rx receiver uses a temperature-compensated crystal oscillator to help with accurate MCU clock frequency, thus improving the performance and reliability of your RC link. Despite the small size, the low latency and high refresh rate of the ELRS system allow this receiver to be used on full-size/long-range quads, while also being small enough to be used on whoop-size quads! The Happymodel EP1 RX includes an IPEX connector for a dipole antenna, while the EP2 RX includes a built-in SMD antenna.

The EP1, EP2, and EP1 Dual modules are based on the ESP8285 MCU that allows for upgrading via WiFi, along with the SX1280(SX1281)IMLTRT RF Module.

Features
Excellent performance in extreme temperatures
Uses a temperature-compensated crystal oscillator
Includes an IPEX connector for a dipole antenna
ESP8285 MCU
High-refresh-rate RF module

- EP1 TCXO Receiver
Type: ISM2.4GHz
ESP8285 MCU
SX1280(SX1281)IMLTRT RF Module
Omni directional antenna
Frequency Range: 2400 MHz to 2500 MHz
Receive refresh rate: 25HZ~500Hz
Working voltage: 5v
Weight: 0.41 gram(without antenna)
Dimension: 10mm*10mm*6mm
Peak gain: 2.23dB
Default Firmware out of factory: HappyModel_EP_2400_RX V3.0.1 version
Built-in a TCXO (temperature compensated crystal oscillator)

- EP1 Dual TCXO Diversity Receiver
Type: ISM2.4GHz
ESP32 PICO D4, dual SX1280(SX1281)
Antenna connector: IPEX MHF 1/U.FL
RF Frequency: 2.4GHz (2400~2480MHz)
Telemetry power: >19dbm
Receiver protocol: CRSF
Input voltage: 3.5~8.4V Recommend +5V DC @ “+” pad
PCB size: 19mm x 14mm
Weight: 1gram exclude antenna
Built-in a TCXO (temperature compensated crystal oscillator)
Default Firmware out of factory: Unified_ESP32_2400_RX Could upgrade to HappyModel EP1 Dual 2400 RX 3.0 FW