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FIRE

请勿任意拆卸或任意改造加工，任何的升级改装或维修，请使用亿展产品目录的零件，以确保结构的安全。

请确认于产品限界内操作，请勿过载使用，并勿用于安全法令外其它非法用途。

锂聚电池较其它电池有更高的危险性，使用前请务必详读并遵照下列注意事项使用本电池，本公司将不对

任何不当使用所造成的损害负责。

严禁使用原厂以外的充电器进行充电，以免发生爆炸起火的危险。

严禁撞击、拆解、正负极反接、焚烧电池，避免金属物品碰触电池正负极造成短路。并请防止尖锐的物品

刺穿电池，以避免电池起火的危险。

充电时请谨慎小心，确保在您的视线范围内进行充电。并远离幼童可以接触的地方，以免发生危险。

电池使用后如有发热情况，严禁充电。否则会造成电池膨胀、变形、爆炸甚至起火燃烧，危害生命财产的安全。

废气的电池，请严格依照该使用国家或地区的废弃物清理法令回收，以免污染环境。

飞行器多半是以PA合金AB或聚乙烯、电了商品为主要材料质，因此要尽量远离热源、日晒、以避免因高

温而变形甚至溶毁损坏的可能。

本产品适用年龄14岁以上，遥控四轴飞行器在学习初期有着一定难度，建议要有经验的人士在旁指导才可以

飞行。

Ages 14 and up

适合年龄14岁以上

Instruction Manual

使用说明书

i3系列

(i3/i3s/i3h/i3hs)

2.4GHz WIRELESS REMOTE CONTROL

THE SMALLEST SIX AXIS DRONE

IN THE WORLD

i Drone

Aircraft is not a toy, remote control aircraft, but there is still some risk of the matter with instructions to

correctly use the model in accordance with the Security, the dismantling of any modification or improper

use of the product are not familiar with may be dangerous to the risk of unexpected or accidental, please

do not overlook.

飞行器并非玩具，虽然是遥控飞行器，但是仍然有一定的危险性，请您依安全注意事项与操作说明来正确的使用该模型，任意的改装拆解或使用

不当以及产品的不熟悉，都可能造成不可预期的危险或意外，请勿轻忽。

注意！任何遥控飞行器的使用，制造商或经销商是无法对使用者于零件使用的损耗异常，组装不当或不安全的环境操作所发生的意外负任何责任，

本产品适用年龄14岁以上，请确保在安全无误的环境下操作，产品售出后本公司不负责因不当操作、拆卸、改装所引起的财产损失与人身伤害。

模型商品属于需高操作技术且为消耗性商品，如经拆装使用后，会造成不等到情况零件损耗，任何使用情况所造成商品不良或不满意，将无法

于保固条件内更换新品或退货，如遇有使用操作维修问题，本公司全省分公司或代理将提供技术指导，特价零件供应服务。

感谢您选购亿展产品！室外飞行的飞行器，为了让您更方便，更容易操控飞行器，请您仔细阅读完此说明书后，再操作这台飞行器，同时请你

妥善保管这本说明书，作为日后调整及维修的参考。

Thanks for using YI ZHAN products. Aircraft is the first quadcopter which can fly outdoor in a wild weather.

In order to play aircraft more convenient and easy, pleasure read it carefully before playing the aircraft.

Meanwhile, please keep it well,and take it for reference when adjustment and maintenance.

四

15. PROBLEMS AND SOLUTIONS

解决问题指引

遥控器

没有电源

Transmitter

not working

3.电池耗尽

3.Batteries are completely consumed

3.更换新电池

3.Replace with new batteries

不能遥控

Control

failure

3.风力太大

3.Too strong wind force

4.遥控器没有对上频

4.Unable to bind to remote

3.切勿在有风情况下飞行，有风会对飞行造成局限，

或会妨碍你的控制飞行

3.Do not fly under the environment of windy as too

strong wind may cause flying limitation to the

aerocraft or flying limitation to the aerocraft or it

may hamper your contrilling or flying.

飞行器

不能升高

Ascending

failure

2.飞行器电池没有电

2.Deplete copter battery

2.为飞行器电池充电

2.Charging the copter

飞行器很快便着陆

Landing too

soon

你太快的将动力操纵杆回拉

The throttle stick is pulled down too fast

慢慢的回拉动力操纵杆让飞行器慢慢着陆

Pull down the throttle stick slowly to perform a

smooth landing

失控

Out of control

超出有效遥控距离

Beyond the effective controlling distance

确保半径30M内不出现同频度持控

Make sure there is no transmitter with the same

frequency is used with in the radius of 30 meters.

问题

PROBLEMS

原因

CAUSES

处理方法

SOLUTIONS

1.开/关掣在“OFF”的位置

1.The transmitter switch is on “OFF”

2.没有依正确电极指示放入电池

2.Install the batteries improperly

1.没有开启遥控器

1.The transmitter switch is on “OFF”

2.飞行器电源是否开启

2.The aerocraft power supply is opened

1.旋翼转动速度太慢

1.The rotation of main blades is too slow

1.把开/关掣打在“ON”的位置

1.Turn on the transmitter

2.检查和确保电池是依照电池箱所指示的正负极放入

2.Check with the pole indications and reinstall the

batteries again

1.把遥控器开/关掣拨向“ON”的位置

1.Turn on the transmitter

2.将飞行器开/关掣拨向“ON”的位置

2.Turn on the aerocraft

1.动力操纵杆向上推

1.Push up the throttle stick

4.正确对频

4.Binding the copter with the remote

16. STRONG & UNIQUE DESIGN

强韧独特设计

Aircraft has been tested at the harshest conditions with exceptional results to prove the stability and

durability of this cutting edge new design.

不仅动力强劲更有坚韧品质，无惧考验。把动力做好并非难事，但通过超负荷连续飞行测试，则完全是另一个境界的事。

且为将来升级更强劲动力独家采用易辨认、易更换的结构设计。

blue

red

蓝

红

black

white

黑

白

当飞行器悬停时机身向右侧飞，请连续按动

左侧飞微调，直到飞行器不会向右移动为止。

当飞行器悬停时机身向左侧飞，请连续按动

右侧飞微调，直到飞行器不会向左移动为止。

When the aerocraft flies sideways(towards

the left) in the process of hovering, please

continuously press the trimming button

(right sideways fly) till it recovers.

When the aerocraft flies sideways(towards

the right) in the process of hovering, please

continuously press the trimming button

(left sideways fly) till it recovers.

当飞行器悬停时机身向后飞，请连续按动前进

微调，直到飞行器不会向后移动为止。

当飞行器悬停时机身向前飞，请连续按动后退

微调，直到飞行器不会向前移动为止。

若飞行器起飞不能垂直上升，可对飞行器进行校正，按速度转换按键100%，同时将油门

操纵杆和方向操纵杆打到左下角，此时飞行器指示灯快速闪烁松开遥控器全部按键，待指

示灯常亮，校正完成。

When the aerocraft flies backward in the

process of hovering, please continuously

press the trimming button (forward) till it

recovers.

When the aerocraft flies forward in the

process of hovering, please continuously

press the trimming button (backward) till

it recovers.

If the copter cannot upward straight, please make a adjustment, pressing the

speed conversion button 100%, also keeping the throttle stick and direction stick

to left bottom, until the instruction light flashing then loosen all buttons. When the

light normally, adjustment done.

1、在室内飞行：请选择附近无障碍物、宠物及人的宽敞飞行。

2、在室外飞行：请选择温暖晴朗及没风或微风的天气飞行。

注意：

① 切勿在气温极端的天气飞行；在过热或过冷的天气下飞行会影响飞行效果或损坏模型。

② 切勿在强风在天气飞行；强风会对飞行造成局限或会妨碍你的飞行控制。在强风的情况下飞行，你的直

升机会不知甩踪或令它损坏。

13. FLYING ENVIRONMENT

飞行前环境

1. Indoor flying: choose a wide place without barriers, pets and people.

2. Outdoor flying: choose the warm, sunny or windless weather.

NOTICE:

① Do not fly in extreme temperatures. Flying in extreme temperatures may affect the performance

and damage the product.

② Do not fly in windy days. The performance and the control of the aerocraft will be affected by

winds. Windy condition may cause the missing and damage of the helicopter.

7.CHARGING BATTERIES

6.TRANSMITTER BATTERY INSTALLATION

Battery cover

电池盖

2 5

The lithium battery of the vehicle as shown removes from the battery holder and disconnect the power

plug,USB charger plug into the power Brain USB jack ,after charging plug of the charger lithium battery

plug is connected,the LED lights off when charging,charging is completed When the LED is light,,the

charging time of approximately 60 minutes.

将飞行器的锂电池按图示方法从电池座取出并拔掉电源插头，将充电器USB插头插入电脑USB插孔，后将充电器的

充电插头与锂电池插头连接，当充电时，LED灯灭，充电结束时LED亮，充电时间约为60分钟左右。

POWER

INDICATION LIGHT

电源指示灯

VIDEO 摄像键

FLIP 翻滚键

DIRECTION STICK

(ELEVATOR +AILERON)

右控制杆(前后.侧飞)

FORWARD/BACKWARD

前后微调

SIDE-FLY

(SIDEWAYS-LEFT/RIGHT)

侧飞微调

CHANNEL AND RUDDER VOLUME MONITOR

通道与舵量大小显示

PHOTO 拍照键

SPEED 档位键

THROTTLE STICK

+RUDDER

左控制杆(油门.转向)

POWER SWITCH

电源开关键

LIGHT

灯光键

ORIENTATION

MODE

指南针模式

AUTO RETURN

一键返航键

POWER

INDICATION LIGHT

电源指示灯

VIDEO 摄像键

FLIP 翻滚键

DIRECTION STICK

(ELEVATOR +AILERON)

右控制杆(前后.侧飞)

FORWARD/BACKWARD

前后微调

SIDE-FLY

(SIDEWAYS-LEFT/RIGHT)

侧飞微调

PHOTO 拍照键

SPEED 档位键

THROTTLE STICK

+RUDDER

左控制杆(油门.转向)

POWER SWITCH

电源开关键

LIGHT

灯光键

ORIENTATION

MODE

指南针模式

AUTO RETURN

一键返航键

i3/i3s

8.BATTERY AND CHARGER SPECIFCATION

3.7V 350MAh

1.5V(GP 15G R2P)

电池种类

Battery Type

电池规格

Battery Specification

可使用时间

Usage Duration

充电所需时间

Charge Time

锂聚电池

Li-po Battery

不可充电

Non Rechargeable

飞行器飞行时间

Helicopter flight time

约6分钟

Approx 6

Minutes

供遥控器开机时间

Transmitter operation time

用18小时

18 Hours

碳锌电池(不可充电)

Carbon-Zinc

(Non Rechargeable)

约60分钟(充电电流约0.5A)

Approx 60 Minutes(Charging

current approx 0.5A)

Universal USB charging line

万能USB充电器

9.BINDING OF RADIO TRANSMITTER AND RECEIVER

将油门遥杆推至最低(如图①)，

打开遥控器电源(如图②)。

①

Lowest

最低

②

ON/OFF

开/关

The throttle stick to the bottom

(Figure 1), turn the remote

control power(Figure 2).

结束飞行时，将飞行器的锂电池按图示

方法从电池座取出并拔掉电源插头.

Done flying, The lithium battery of

the vehicle as shown removes from

the battery holder and disconnect

the power plug.

1. Turn the remote ON. Connect the copter battery and PCB

cable, and place it on Level ground. The copter LEDs become

static and then start blinking. Push the Throttle Stick

STRAIGHT UP to the highest point and then PULL it back

down slowly.The binding process is complete. And the copter

will respond to controls from the Remote. IMPORTANT: Do

not move the copter while the binding process is on, as the

Gyro is being set to neutral.

2. When the aircraft take off, tend to different directions,

adjust the remote control fine-tune to fly Stabilizer, the remote

control throttle to the minimum, turn off the remote control

power to open Off, and other aircraft lights flashing unplug

the battery to complete the memory function.

(Note: the next take-off more stable)

1.将电池依图所示方向推入电插座至定位，将飞行器置于平坦

位置后，机身灯闪烁此时不要再移动机身，使遥控器对频与

陀螺仪读取中立点，机身灯快闪转为慢闪时把摇杆推到最高，

然后拉到最低，此时接收板灯停止闪烁对码完成。

2.飞行器起飞时，倾向不同方向，调整遥控器微调使飞行器稳

定，将遥控器油门拉到最低，关闭遥控器电源开关，等飞行

器指示灯闪烁拔掉电池，完成记忆功能。

(注：下次起飞比较稳定)

11. ORIENTATION MODE / AUTO RETURN

指南针飞行模式/一键返航模式

突破性的指南针飞行模式/一键返航模式让您控制飞

行器飞行到远处，眼睛无法识别方向时，启动后可

以无论方向，简单操控！

注意:

(1)指南针模式/一键返航模式的正常启动需要先为机身

接入电源后，您需正面对准飞行器尾部，再启动遥控器

对频至机身LED灯常亮后可正常飞行使用。

(2)飞行器起飞后机身LED灯是指南针模式的自动校正，

请勿控制转向遥杆，离开地面后方可完成其它动作，以

免指南针模式无法正常运行。

Outstanding Orientation Mode / Auto Return, can

start and fly in any orientation. If it flies far away,

no need to worry about losing the orientation.

NOTICE:

1.Orientation Mode / Auto Return: Connect the charged

battery to the drone. Place the drone on a FLAT surface.

Switch “ON” the Transmitter, The light in the drone blinks

rapidly; indicating the binding process is on. When the

LED remains constant, the binding process is complete.

2.After Tarantula flight,LED light of the body is the

indicator which the compass mode automatically

adjustment.Please don't control the joystick, you can

operate other actions after it left the ground which to

avoid the compass mode unnormal operated.

12. FLIGHT ADJUSTMENT AND SETTING

飞行动作调整与设定

Before you are familiar with the flight vehiole, pleasure don’t set it fly, read the instruction carefully. Ger

familiar with all kinds of direction control and keep repeating until you can play it as you perform your wishes.

1.Place the flight vehicle a clear open field and the tail of helicopter point to yourself.

2.Practice to operate the throttle stick(as below illustration)and repeat practicing Throttle high/low , Aileron

left/right, Rudder left/right, and Elevator up/dowm. i Aircraft

3.The simulation flight practice is very important, please keep practicing until the fingers move naturally when

you hear operation orders being call out.

在还没有了解飞行器各个动作的操控前，严禁实机飞行，请先阅读说明书，熟悉各种方向的操控并不断的重复，直到手指可熟练的

控制各种动作以及方向。

1.将飞行器在空旷的地方，并将飞行器背面对准自己。

2.练习操作遥控器的各摇杆(各动作的操作方式如下图)，并反复练习油门高/低、副翼左/右、升降舵前/ 后及方向舵左/右操作方式。

3.模拟飞行的练习相当重要，请重复练习直到不需要思索，手指能自然随着喊出的指令移动控制。

ON/OFF

开/关

Take out

取出

Turn off the transmitter. If transmitter is not

to be used for a long duration, please remove

the battery for storage. i UAV

关闭发射器电源，长时间不使用时请将遥控器电

池取出并妥善保管。

Warning: If the AA batteries are left in the

transmitter, potential leakage could occur

which may damage the transmitter, and

create fire hazards. i Aircraft

电池未取下，将导致电池漏液而损坏遥控器，

甚至造成起火燃烧的危险。

解锁功能

10.UNLOCK FUNCTION

Remote control and aircraft after the frequency, please pull the throttle

lever to the left dowm corner and also the direction lever to the right

down corner in the same time in order to start the emergency stop as

the picture shown. This time the air craft will Start working very quickly.

遥控器与飞行器对频后，请照图示，同时分别将油门杆推向左下方，方向操作

杆推向右下方，飞行器马达将会迅速开始转动。

Remote control and aircraft after the frequency, please pull the throttle

lever to the left dowm corner and also the direction lever to the right

down corner in the same time in order to start the emergency stop as

the picture shown. This time the air craft will Start working very quickly.

遥控器与飞行器对频后，请照图示，同时分别将油门杆推向左下方，方向操作

杆推向右下方，飞行器马达将会迅速开始转动。

i3h/i3hs

Charger x1

充电器 x1

Screwdriver x1

螺丝刀 x1

Propeller x4

螺旋桨 x4

i3(Black)

飞行器(黑色)

Instruction Manual x1

说明书 x1

Transmitter x1

遥控器 x1

( Standard One 标配一款 )

螺旋浆

Propeller

下盖

Under cover

摄像头

Camera

电机

Motor

Cover

上盖

螺旋浆

Propeller

下盖

Under cover

电机

Motor

Cover

上盖

i3s/i3hs(含摄像头)

i3/i3h

(不含摄像头)

5.NOMENCLATURE

POWER

INDICATION LIGHT

电源指示灯

VIDEO 摄像键

FLIP 翻滚键

DIRECTION STICK

(ELEVATOR +AILERON)

右控制杆(前后.侧飞)

FORWARD/BACKWARD

前后微调

SIDE-FLY

(SIDEWAYS-LEFT/RIGHT)

侧飞微调

CHANNEL AND RUDDER VOLUME MONITOR

通道与舵量大小显示

PHOTO 拍照键

SPEED 档位键

/长按急停

THROTTLE STICK

+RUDDER

左控制杆(油门.转向)

POWER SWITCH

电源开关键

ONE KEY LANDING

一键起飞/长按降落

ORIENTATION

MODE

指南针模式

AUTO RETURN

一键返航键

POWER

INDICATION LIGHT

电源指示灯

VIDEO 摄像键

FLIP 翻滚键

DIRECTION STICK

(ELEVATOR +AILERON)

右控制杆(前后.侧飞)

FORWARD/BACKWARD

前后微调

SIDE-FLY

(SIDEWAYS-LEFT/RIGHT)

侧飞微调

PHOTO 拍照键

SPEED 档位键

/长按急停

THROTTLE STICK

+RUDDER

左控制杆(油门.转向)

POWER SWITCH

电源开关键

ONE KEY LANDING

一键起飞/长按降落

ORIENTATION

MODE

指南针模式

AUTO RETURN

一键返航键

i3h/i3hs

特别提示

慢慢推动油门操纵杆，当飞行器离开地面至空中时，若飞行器在空中打转或倾向

不同方向，可使用微调修正动作。

Push the throttle level slowly; please press the trimming buttons when the

aerocraft hovers or leans to different directions in the air. i Aircraft

NOTICE

当左操纵杆（油门）向上推，主风叶转速增大，

飞行器升高。

当左操纵杆（油门）向下推，主风叶转速减慢，

飞行器下降。

Push up the throttle stick,and the spinning

speed of the main blades will increase.

The aerocraft begins to ascend.

Pull down the throttle stick,and the spinning

speed of the main blades will decrease.

The aerocraft begins to descend.

当左操纵杆（转向舵）向左推，飞行器机

头向左转。向右推，飞行器机头向右转。

Push the rudder stick to the left,and the

aerocraft will turn to left. Push the rudder

stick to the right, and the aerocraft will

turn to right.

当右操纵杆（方向舵）向上推，飞行器向前进。

当右操纵杆（方向舵）向下推，飞行器向后退。

When the rudder stick is pushed upward,

the aerocraft swashplate will downtilt and

it advances.

When the rudder stick is pushed

downward,the aerocraft will uptilt and

it recedes.

当右操纵杆（方向舵）向右推，飞行器机

身偏向右侧飞行。

当右操纵杆（方向舵）向左推，飞行器机

身偏向左侧飞行。

When push the right lever(steering rudder)

to the right,the aerocraft will fly to the right.

When push the right lever (steering rudder)

to tht left,the aerocraft will fly to the left.

左侧飞

Left

sideward fly

右侧飞

Right

sideward fly

上升

Ascending

下降

Descending

一键起飞/长按降落

飞行高度1.5米

左右

当左操纵杆（油门）向上推，主风叶转速增大，

飞行器升高。

当左操纵杆（油门）向下推，主风叶转速减慢，

飞行器下降。

Push up the throttle stick,and the spinning

speed of the main blades will increase.

The aerocraft begins to ascend.

Pull down the throttle stick,and the spinning

speed of the main blades will decrease.

The aerocraft begins to descend.

上升

Ascending

下降

Descending

右转

Turn right

左转

Turn left

前进

Forward

后退

Backward

注:只用i3h

定高功能

注意：当飞行器在离地面30cm的位置，飞行器会受到自身桨叶涡流的影响而变得不稳定，这就叫“地效反应”当飞行器

的重量越低时。地效反应的影响越大。

Attention: When the aerocraft ascends to 30cm high, it will suffer the “ ground effect ” and its performance

will become unstable. i UAV

定点旋转(方向旋转)

Fixed-point revolving

在指定地点着陆(定点着陆)

Fixed-point landing

经过足够的练习后，尝试以下飞行练习

To master the aerocraft, please attempt the following flying practices.

飞行练习

FLYING PRACTICE

你可对飞行器进行定点起飞、着陆、旋转等基本练习后、再尝试飞行方形、十字

架形图案的飞行练飞。飞行器机身指示灯闪烁，表示飞行器电量不足提醒需返回。

You can sentinel take-off and landing of the aircraft, rotation, and other basic Practice,

and then attempt to fly the square, cross-shaped pattern of flight training fly. The indicator

light of aircraft is flashing, that means the aircraft's power is low,it remind you to control

the copter back.

To flight a square pattern

飞行一个方形图案

Completion of a cross action

完成一个十字架动作

当前面的基本动作都很熟练时就可以玩一些惊险的翻滚动作。将飞行器飞到3米以上高度后，按下翻滚按键遥控器发

出嘀嘀响声，并同时将右操纵杆(方向舵)向一个方向打到底然后松开，此进飞行器就可以实现翻滚动作。

Rolls and flips are advanced flying techniques and should be attempted once you have matered the art

of controlling the copter in flight. Please hover the copter at a steady height of 3 meters from the ground,

press and hold the flip stunt button and push the elevator sticker slightly Upward and release immediately.

The copter will instantly perform a Forward 3D flip. i Aircraft

3D翻转飞行

3D FLIP FLYING

左翻

Flip towards

the left

右翻

Flip forwards

the right

后翻

Flip

backward

前翻

Flip

forward

14. PHOTOGRAPHS AND VIDEO

拍照和摄像

将内存卡插入机身卡槽(图1)，打开飞行器电源，打开遥控器电源；

拍照功能：按下拍照按钮(图2)，红灯闪一下，绿灯长亮；

摄像功能：按下摄像按钮(图3)，红灯常闪烁，再按摄像按钮结束

摄像。

(图1 / Figure1)

PHOTO

拍照键

(图2 / Figure2)

VIDEO

摄像键

(图3 / Figure3)

The memory card into the card slot of the fuselage (Figure1), open the aircraft power,

open the remote control power supply;

Camera function: Press the camera button (Figure 2), the red light flashed, green light;

Camera: Press Camera button (Figure 3), Often flashing lights, press the camera

button to end the camera.

17. PARTS LIST

各种零件名称

18. ACCESORIES FIGURE

配件图

编号

NO.

名称

Name

数量

Quantity

规格

Specification

代码号

Code No.

机壳

接收板

电池支架

电池

LED灯

摄像头

电机座

风叶

机架

电机

1.机壳

2.接收板

3.风叶(A)

7.电机(A)

电机(A)

电机(B)

电机(A)

7.电机(B)

10.电机座 10.电机座

7.电机(B)

8.LED灯

LED灯

9.摄像头

摄像头

7.电机(A)

3.风叶(B)

3.风叶(A)

4.电池支架 5.电池

6.机架

LITHIUM BATTERY

PROPELLER (A)

PROPELLER (B)

PROPELLER (A)

PROPELLER (B)

LED LIGHT

MOTOR (B) MOTOR (A)

MOTOR (A)

MOTOR (B)

SUPPORT FRAME

FRAME

MOTOR COVERMOTOR COVER

PROTECTIVE COVER

MAINBOARD

MOTOR (B)

MOTOR (A)

MOTOR (B)

MOTOR (A)

LED LIGHT

APPLY TO

(i3s.i3w.i3hs.i3hw)

FPV CAMERA

Protective Cover

Mainboard

Propeller

Support Frame

Lithium Battery

Frame

Motor

Led Light

Motor Cover

Fpv Camera

Summary of content (2 pages)

PAGE 1
Ages 14 and up 适合年龄14岁以上 Thanks for using YI ZHAN products. Aircraft is the first quadcopter which can fly outdoor in a wild weather. In order to play aircraft more convenient and easy, pleasure read it carefully before playing the aircraft. Meanwhile, please keep it well,and take it for reference when adjustment and maintenance.
PAGE 2
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.