Flysky FGr4 / FGr4S / FGr4P AFHDS 3 Receivers

Short Description:

Flysky FGr4, FGr4S and FGr4P are 2.4GHz AFHDS 3 four-channel receivers with PWM, PPM, i-BUS and S.BUS outputs for compatible Flysky radios.

Product Name: Flysky FGr4 / FGr4S / FGr4P AFHDS 3 Receivers
Product Type: Bidirectional RC Receiver
Frequency Range: 2.4GHz
Channels: 4 PWM Channels
Output Interface: PWM / PPM / i-BUS / S.BUS
Input Voltage: FGr4: 3.5–12V DC; FGr4S: 3.5–8.4V DC; FGr4P: 3.5–8.4V DC
Control Protocol: AFHDS 3
Antenna Type: FGr4/FGr4P: 150mm External Single Antenna; FGr4S: Built-in Single Antenna
Dimensions: FGr4/FGr4P: 29 × 22 × 16.2mm; FGr4S: 25.5 × 22 × 17.3mm
Weight: FGr4: 15g; FGr4S: 5.1g; FGr4P: 8g

Send email to us

Product Detail

FAQ

Technical Highlights

Three AFHDS 3 Receiver Variants

The Flysky FGr4, FGr4S and FGr4P are 2.4GHz four-channel receivers based on the AFHDS 3 protocol. They share the same basic control and data-output functions while offering different antenna arrangements, input-voltage ranges, dimensions and weights.

Four PWM Control Channels

Each model provides four PWM channels for connecting compatible steering servos, throttle equipment and other RC control devices. The channel layout and housing design vary by receiver model.

Multiple Output Protocols

The receiver family supports PWM, PPM, i-BUS and S.BUS output options. The required output mode should be selected through the compatible transmitter or receiver settings before connecting the target equipment.

Bidirectional Data and RSSI Support

All three models support RSSI and bidirectional AFHDS 3 communication. The i-BUS connection can also be configured for compatible Flysky sensor use where supported by the selected receiver and transmitter settings.

External or Built-in Antenna Options

The FGr4 and FGr4P use a 150mm external single antenna, while the smaller FGr4S uses a built-in single antenna. The antenna design should be considered together with the available installation space and required mounting position.

Online Firmware Update Support

Flysky specifies online-update support for all three receiver models. Receiver firmware and compatible transmitter firmware should be checked before binding or changing interface settings.

Model Comparison

Model	FGr4	FGr4S	FGr4P
PWM Channels	4	4	4
Wireless Frequency	2.4GHz	2.4GHz	2.4GHz
Wireless Protocol	AFHDS 3	AFHDS 3	AFHDS 3
Specified Ground Range	More than 300m	More than 200m	More than 200m
Antenna Type	150mm external single antenna	Built-in single antenna	150mm external single antenna
Input Voltage	3.5–12V DC	3.5–8.4V DC	3.5–8.4V DC
Dimensions	29 × 22 × 16.2mm	25.5 × 22 × 17.3mm	29 × 22 × 16.2mm
Weight	15g	5.1g	8g

RF and Interface Specifications

Product Type	Bidirectional RC receiver
Operating Frequency	2.4GHz
Receiver Protocol	AFHDS 3
PWM Channels	4
Supported Outputs	PWM / PPM / i-BUS / S.BUS
RSSI	Supported
Online Update	Supported
Compatible Flysky Systems	NB4, NB4 Lite, PL18, FRM302 and compatible AFHDS 3 systems

Environmental Specifications

Operating Temperature	-10°C to +60°C
Operating Humidity	20% to 95%

Model Selection Guidance

Select the FGr4 when the specified ground range of more than 300m and the wider 3.5–12V input range are required.
Select the FGr4S when a smaller 25.5 × 22 × 17.3mm housing, 5.1g weight and built-in antenna are preferred.
Select the FGr4P when a 150mm external antenna, 3.5–8.4V input and 8g receiver are suitable for the installation.
Actual usable control distance depends on transmitter configuration, antenna installation, local interference, terrain and operating conditions.
Confirm that the selected transmitter or RF module uses the AFHDS 3 protocol before ordering.

Installation Notes

Use the input-voltage range specified for the selected receiver model.
For the FGr4, use 3.5–12V unless the exact production-unit label and corresponding Flysky documentation confirm a different upper limit.
Verify signal, positive and ground orientation before connecting servos, an ESC or other equipment.
Keep external antennas away from high-current cables, motors, ESCs, batteries and conductive chassis parts.
Do not sharply fold, cut or place pressure on the antenna cable.
Configure the required PWM, PPM, i-BUS or S.BUS output mode before operating the model.
Perform binding, steering-direction, throttle, failsafe and control-range checks before use.

Important Product-Type Notice

The FGr4, FGr4S and FGr4P are radio-control receivers. They do not transmit FPV video and do not provide VTX video channels or selectable video-transmission power.

FAQ

Are the FGr4, FGr4S and FGr4P video transmitters?

No. They are 2.4GHz AFHDS 3 radio-control receivers. They do not transmit FPV video and do not provide VTX frequency channels or video-output-power settings.

What is the main difference between the three receiver models?

The models differ in input-voltage range, antenna arrangement, dimensions, weight and specified ground range. Their shared features include four PWM channels, AFHDS 3 communication and PWM, PPM, i-BUS and S.BUS output support.

Which model has a built-in antenna?

The FGr4S uses a built-in single antenna. The FGr4 and FGr4P use a 150mm external single antenna.

Which receiver has the widest input-voltage range?

The current Flysky specification lists the FGr4 at 3.5–12V DC. The FGr4S and FGr4P are both rated for 3.5–8.4V DC.

Why does one FGr4 product image show 3.5–18V?

The supplied FGr4 image shows a 3.5–18V marking, while the current Flysky specification lists 3.5–12V. Use the official 3.5–12V limit unless the exact production-unit label and corresponding documentation confirm otherwise.

Which output interfaces are supported?

The receiver family supports PWM, PPM, i-BUS and S.BUS. The required output protocol must be configured through the compatible transmitter or receiver settings.

Are these receivers compatible with the Flysky Noble NB4?

Yes. Flysky lists the FGr4, FGr4S and FGr4P as compatible with the NB4 and NB4 Lite. They are also listed for compatible AFHDS 3 systems including the PL18 and FRM302.

Do the receivers support firmware updates?

Yes. Flysky specifies online-update support for all three models. Check transmitter and receiver firmware compatibility before binding or changing output settings.

B2B Procurement FAQ

Can the three receivers be presented as variants of one product?

Yes. They share the same AFHDS 3 protocol, 2.4GHz operating band, four-channel configuration and output-protocol options. The model name, voltage, antenna, dimensions, weight and specified range must remain separated.

Which information should be included in a quotation request?

Please specify FGr4, FGr4S or FGr4P, required quantity, target transmitter system, destination market and the required output interface.

Can different receiver models be included in one order?

A mixed-model order may be requested, but model availability, quantities, packaging and commercial terms must be confirmed during quotation.

What should be confirmed before approving a bulk order?

Confirm the exact receiver model, production revision, input-voltage marking, antenna configuration, firmware version, transmitter compatibility, stock status, lead time, packaging and applicable compliance documentation.

Should unrelated images from the supplied archive be used on the product page?

No. Images showing motors, ESCs, frames, flight controllers, cameras, goggles, logistics or general company information are not product evidence for the FGr4 receiver series and should not be used as receiver product images.