RADIOMASTER RC RP3-H ExpressLRS 2.4GHz Nano Receiver User Manual

: September 21, 2024
: RadioMaster RC

Table of Contents

RP3-H ExpressLRS 2.4GHz Nano Receiver
Specifications:
Product Usage Instructions:
Traditional Binding Process:
Status Lights and Meanings:
- Frequently Asked Questions (FAQ):
Q: How do I update the firmware on my RP3-H receiver?
Q: What are the benefits of using the TCXO in the RP3-H
Q: Can the RP3-H receiver be used with other transmitters

RP3-H ExpressLRS 2.4GHz Nano Receiver

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Specifications:

Model: RP3-H
Frequency Range: 2.404 – 2.479 GHz
RF Power Output: 100mW
MCU: ESP8285
RF Chip: SX1281IMLTRT
Antenna Diversity: Yes
Power Input: DC 4.5 – 8.4V
Weight: 5.1g
Dimensions: 28mm x 24mm x 8mm
Firmware: ExpressLRS v3.3.1
Compatibility: CRSF/S.Bus

Product Usage Instructions:

Traditional Binding Process:

Power off your transmitter.
Plug in and unplug your receiver three times.
Ensure the LED is doing a quick double blink, indicating the
receiver is in bind mode.
Use the [BIND] button on the ExpressLRS Lua script to send out
a binding pulse.
If the receiver’s light is solid, it indicates successful
binding.

Status Lights and Meanings:

Status Light	Meaning
500 Slow flash (500ms)	Waiting for transmitter
25 Fast flash (25ms)	WIFI On
Double flash	Receiver in bind mode
Triple flash	Receiver functional, mode selection error
Solid	Receiver functional

Frequently Asked Questions (FAQ):

Q: How do I update the firmware on my RP3-H receiver?

A: Firmware updates can be done wirelessly over WiFi without the
need to remove the receiver from your craft. Make sure to visit the
ELRS website for detailed instructions on firmware updates.

Q: What are the benefits of using the TCXO in the RP3-H

receiver?

A: The TCXO ensures high stability and accuracy in frequency
control, compensating for temperature variations. This results in
consistent and reliable signal reception, even in extreme
temperature conditions, and provides long-term frequency stability
while preventing signal degradation.

Q: Can the RP3-H receiver be used with other transmitters

besides RadioMaster?

A: Yes, the RP3-H receiver is compatible with CRSF/S.Bus
protocols, allowing it to work with various transmitters besides
RadioMaster.

For more information, please visit the ELRS website: ELRS

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RP3-H

RP3-H
Designed specifically for use with our Nexus Helicopter Flybarless control unit and compatible with all CRSF/S.BUS enabled flight controllers the RP3-H ExpressLRS receiver comes with a built-in TCXO and an integrated housing design that makes the receiver tougher and ready to mount in modern helicopter frames. With the RP3-H receiver, you can get reliable, stable, and accurate signal reception, which enhances your flight experience and allows for superior performance even in demanding environments. The RP3-H also features an Ext-V telemetry input for compatibility with older ESCs that do not provide battery voltage telemetry via the control unit.

The RP3-H receiver uses the Skyworks SKY66112 power amplifier too increase telemetry performance, the PA provides up to 100mw of telemetry power, and antenna switching for antenna diversity. It is developed around the ESP8285 MCU and SX1281IMLTRT RF Chip, offering Lora and FLRC 2.4GHz RF links that provide incredible range and low latency. With Wifi built-in, firmware updates can be done on your craft without the need to remove the receiver.

TCXO (temperature compensated crystal oscillator)
The TCXO ensures high stability and accuracy in frequency control, compensating for temperature variations. This results in consistent and reliable signal reception, even in extreme temperature conditions. It also reduces frequency drift over time, providing long-term frequency stability and preventing signal degradation. Click https://www.expresslrs.org/hardware /crystal-frequency-error to learn more about the TCXO.

RP3-H Specifications Item: RP3-H ExpressLRS 2.4GHz Nano Receiver Type: ISM MCU: ESP8285 RF Chip: SX1281 Telemetry RF power: Max 100mW Antenna: 150mm 2.4GHz Antenna x2 Frequency Range: 2.404 – 2.479 GHz Maximum receive refresh rate: 500Hz / F1000Hz Minimum receiver refresh rate: 25Hz Working voltage: 5v Battery voltage detection range: DC 4.0 – 35V Weight: 5.1g (Including two antenna) Dimension: 28mm24mm8mm Firmware Version: ExpressLRS v3.3.1 pre- installed FW Target: RadioMaster RP3-H Diversity 2400 RX Bus interface: CRSF/S.Bus

RP3-H RP3-H ExpressLRS 2.4GHz Nano ISM ESP8285 SX1281 : 100mW 2 150mm 2.4GHz 2.404 – 2.479 GHz 500Hz/F1000Hz 25Hz DC 4.5 – 8.4V DC 4.0 – 35V 5.1g 2 28mm24mm8mm ExpressLRS v3.3.1 RadioMaster RP3-H Diversity 2400 RX CRSF/S.Bus

TX RX VCC GND

BOOT

BOOT
RP3-H

1 2 3ExpressLRSLUABIND 4

Traditional Binding
For traditional binding, the binding phrase must be commented out in user_defines on the RX.
1Power off your transmitter 2Plug in and unplug your receiver three times 3Make sure the LED is doing a quick double blink, which indicates the receiver is in bind mode 4Use the [BIND] button on the ExpressLRS Lua script, which sends out a binding pulse 5If the receiver has a solid light, it’s bound!

Receiver disconnected
WIFI WIFI upgrade mode
Bind mode
Mode matching failed
Receiver connected

Status light
500 Slow flash (500ms)
25 Fast flash (25ms)
Double flash
Triple flash
Solid

Meaning
Waiting for transmitter
WIFI WIFI On
Receiver in bind mode
Receiver functional, mode selection error
Receiver functional

For more information, please visit the ELRS website: ELRShttps://www.expresslrs.org/2.0/