RadioMaster R81

产品特性
通道个数：8通道
频率范围：2400-2483.5Mhz
供电范围：4.5-6V
信号格式：D8
输出格式：SBUS
支持回传：支持回传RSSI
控制距离：大于1km
天线长度：约6cm
尺 寸：17*11毫米
重 量：2克
S
S.BUS
DC4.5-6V
GND
对频方法
1. 接收机按住BIND按钮，同时接通电源，约等待3秒后接收机LED红灯常亮，等待对频
2. 遥控器多协议高频头选择D8协议，并按下[BIND]选项，接收机红灯闪烁，表示对频成功
3. 遥控器退出[BIND]模式，接收机需重新通电，此时接收机红灯常亮，对频成功
失控保护
1. 接收机通电10秒内，按一次BIND按钮，接收机将保存遥控器当前所有通道值，作为失控保值
2. 接收机通电10秒之后，BIND按钮功能将被停用，以防止飞行时误触更改失控保护设置
RSSI输出
此接收机共计9个通道，为8通道+RSSI输出通道，1-8通道来自遥控器的控制，第9通道是接收机
自身输出的信号强度RSSI值，可由飞控读取并发送至OSD设备显示信号强度
R81接收机用户指南
频率微调
***特别注意*** D8和D16协议接收机在正式使用之前，必须使用频率微调功能，消除发射机与接收机
之间的频率误差，才可达到最佳遥控距离与稳定性，具体操作方法如下：
1.将RF Freq.fine tune数值逐渐调低，直到接收机丢失信号，并记录下这个数值(一般为负数)
2.再RF Freq.fine tune数值逐渐调高，直到接收机丢失信号，并记录下这个数值(一般为正数)
3.将这两个数字按此公式计算，得出频率微调中点值，并填写在RF Freq.fine tune参数中
(低位数值+高位数值)÷2=中点值
例如：得到低位数值为-73，高位数值为35，根据公式计算
( )
( )
-19 tuneFreq.fine RF
238- tuneFreq.fine RF
23573- tuneFreq.fine RF
=
÷=
÷+=

RadioMaster R81 Specifications

General

Frequency Range	2.4GHz
Channels	8
Output Signal	PWM
Antenna Length	15 cm
Telemetry	No
Type	Receiver
Protocol	FrSky D8
Power Supply Range	3.3V - 10V
Signal Format	SBUS
Compatibility	FrSky D8

Summary

Product Specifications

Channels and Frequency

Specifies 8 channels and a frequency range of 2400-2483.5MHz.

Power, Signal, and Output

Details power input range (4.5-6V), D8 signal format, and SBUS output format.

Return Support and Range

Confirms support for RSSI return and a control distance exceeding 1km.

Physical Dimensions and Weight

Lists antenna length (approx. 6cm), size (17x11mm), and weight (2g).

Binding Method

Initiate Bind Mode

Press and hold BIND, then connect power; receiver LED turns solid red.

Perform Binding

Select D8 protocol on remote, press BIND; receiver LED flashes.

Complete Binding

Exit remote bind mode, power cycle receiver; LED solid red indicates success.

Failsafe Protection

Set Failsafe Value

Press BIND within 10s of power-on to save current channel values as failsafe.

Disable Failsafe Function

BIND button is disabled after 10s to prevent accidental changes.

RSSI Output Configuration

Channel Allocation

Receiver offers 9 channels: 8 for control, 1 for RSSI signal strength.

Frequency Fine Tuning

Essential for D8/D16 to correct frequency errors for optimal performance.

Frequency Tuning Procedure

Adjust RF Freq. fine tune until signal loss, record values, and calculate median.