SIYI AK28 HD User manual

AK28 HD/HD+ User Manual V1.1
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2019 SIYI Technology Copyright
AK28 HD/HD+ ENTERPRISE SMART
CONTROLLER USER MANUAL
V1.1
May 2020

AK28 HD/HD+ User Manual V1.1
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2019 SIYI Technology Copyright
Thank you for purchasing SIYI Technology’s product.
After a series of technology breakthroughs intended for extremely long-range UAV control
transmission combined with high resolution video streaming, we are pleased to introduce the AK28
HD and HD+. The AK28 HD/HD+ is integrated with the latest 1080p HD video transmission while
taking advantage of the most advanced frequency hopping technology and anti-interference RF
algorithms.
The Sky Station is made of CNC crafted aviation aluminum which not only makes the unit marvelous
in its appearance, but also provides a remarkable level of cooling.
To support as many video streaming devices as possible, there are both an Ethernet port as well
as an HDMI input on the receiver.
The brand new AK28 HD/HD+ system will present you with a flexible live experience whether it’s
for FPV flight or aerial video streaming.
To maintain a safe and orderly public space and to ensure you a good using experience of AK28
HD/HD+ transmitter, please read this manual carefully. If you have any issue using the product,
please consult the manual or check online pages of AK28 HD/HD+ on SIYI Technology’s official
website (http://www.siyi.biz). You can also inquire our after-sale service coordinator
([email protected]).

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CONTENT
1 READ TIPS...............................................................................................................................................................1
1.1 Icon Definition....................................................................................................................................................1
1.2 Flight Safety .......................................................................................................................................................1
1.3 Precautions on Charging AK28 HD/HD+..........................................................................................................3
1.4 Precautions on Using SD Card...........................................................................................................................5
1.5 How to Use SIM Card on AK28 HD/HD+.........................................................................................................5
1.6 Precautions on Storage/Carrying/Recycling.......................................................................................................5
2 PRODUCT INTRODUCTION .................................................................................................................................7
2.1 Product Features.................................................................................................................................................7
2.2 Parts..................................................................................................................................................................10
2.2.1 At a Glance................................................................................................................................................10
2.2.2 Button/Switch Types and the Default Channel Definitions.......................................................................11
2.2.3 Ports on AK28 HD/HD+ ...........................................................................................................................12
2.3 Technical Specification ....................................................................................................................................13
2.4 Packing List......................................................................................................................................................15
2.5 AK28 HD/HD+ Common Diagram..................................................................................................................17
2.6 Transmitter LED Indicator Definitions ............................................................................................................18
3 GET READY TO USE AK28 HD/HD+.................................................................................................................19
3.1 How to Place Transmitter Antennas Right.......................................................................................................19
3.1.1 Good Antenna Angle of Transmitter.........................................................................................................21
3.1.2 Good Antenna Angle of Sky Station .........................................................................................................22
3.2 How to Charge AK28 HD/HD+ Transmitter....................................................................................................23
3.3 How to Link/Bind AK28 HD/HD+ Transmitter to the Sky Station.................................................................25
3.4 Throttle Joystick Type......................................................................................................................................27
4 OPERATING SYSTEM..........................................................................................................................................29
4.1 Tips...................................................................................................................................................................29
4.2 Download System Application.........................................................................................................................29
4.3 How to Import Files and Install System Application .......................................................................................29
5 SIYI TX...................................................................................................................................................................31
5.1 Channel Settings...............................................................................................................................................31
5.1.1 End Point...................................................................................................................................................31

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5.1.2 Middle Point ..............................................................................................................................................32
5.1.3 Channel Reverse........................................................................................................................................33
5.1.4 Channel Mapping ......................................................................................................................................34
5.2 Datalink Settings...............................................................................................................................................35
5.3 System Settings.................................................................................................................................................36
5.4 Fail-safe............................................................................................................................................................37
5.5 RC Relay ..........................................................................................................................................................38
6 SKY STATION (RECEIVER)................................................................................................................................40
6.1 At a Glance.......................................................................................................................................................40
6.2 Datalink Connection with FC...........................................................................................................................40
6.3 Datalink Connection with Ground Station .......................................................................................................41
6.4 Videolink Module.............................................................................................................................................42
6.4.1 Connect to an HDMI Camera....................................................................................................................42
6.4.2 Connect to an Ethernet Camera.................................................................................................................43
6.4.3 Configuration.............................................................................................................................................45
6.4.4 Why No Image in My Device?..................................................................................................................45
7 Firmware and Voice Upgrading..............................................................................................................................50
8 After-sale Service....................................................................................................................................................52
8.1 To-be-repair Procedure.....................................................................................................................................52
8.2 After-sale Policy...............................................................................................................................................52
8.2.1 7-Day Return & Refund.............................................................................................................................52
8.2.2 15-Day Replacement .................................................................................................................................54
8.2.3 1-Year Warranty Repair ............................................................................................................................55

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1 READ TIPS
1.1 Icon Definition
Please pay more attention to content indicated with the following marks:
DANGER Dangerous manipulation probably leads to human injuries.
WARNING Warnings on manipulation possibly leads to human injuries.
CAUTION Cautions on what manipulation may lead to property loss.
Prohibited Mandatory Mark
1.2 Flight Safety
AK28 HD/HD+ Enterprise Smart Controller is designed for professional application
in specific industries, users who approaches to the device should have at least the
basic ability to manipulate it. Any irregular or irresponsible manipulations of the
device may cause damages or lead to property loss or human injuries. Non-adult
users must follow their trainer’s guidance or the supervision of an adult.
Disassembling or modification on AK28 HD/HD+ system is prohibited without
permission from its manufacturer, SIYI Technology.

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To maintain a safe and orderly public space and to ensure you a good using
experience of SIYI’s products, please read the prohibited and mandatory terms
carefully.
Do not use AK28 HD/HD+ system to control your aircraft/vehicle at places with
intensive crowd (a square, a park), or at places with many obstructions (a street, a parking
lot), or in fields with strong magnetic or interference (an electricity plant, a radar station,
railways), or in any other fields where an irregular flight/operation may cause property loss
or human injuries.
Do not hold or cover transmitter antenna or obstruct its transmission by any means in
a flight or an operation.
Never point your transmitter antenna’s upper ends straightly to your aircraft/vehicle
while it is working, they are the weakest part for transmission.
Do not start your aircraft/vehicle when you are tired, drunk, in sickness or any
circumstances you are not feeling good.
Do not take off your aircraft when it is rainy, windy or at night.
Do not power off the transmitter while your aircraft’s/vehicle’s engines and motors are
still working.
Please always try to control your aircraft/vehicle within sight range.
Make sure that your AK28 HD/HD+ transmitter’s screen display the FC control center
and you can monitor their status before starting your aircraft/vehicle.

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Do not forget to check battery level of the transmitter and the receiver before starting
your aircraft/vehicle.
Always power off your aircraft/vehicle first, AK28 HD/HD+ transmitter the second.
Before changing any settings for the transmitter, make sure your aircraft’s/vehicle’s
engines are powered off and their motor wires are off connection, in case of a sudden switch
on.
When you start your aircraft/vehicle for the first time, make sure that the fail-safe
settings in your AK28 HD/HD+ transmitter is activated.
Always switch on the transmitter first and hold the throttle joystick at its bottom
position, then power on your aircraft/vehicle.
1.3 Precautions on Charging AK28 HD/HD+
AK28 HD/HD+ transmitter is equipped with a replaceable and chargeable
12960mAh LiPo 1S battery and a 5V/2A Micro-USB charger adapter.
Do not use any USB chargers over 5V output to charge the transmitter.
For the best charging experience, please power off your transmitter before charging.
The charging current should not exceed 2A.
Stop charging immediately if you found the charger damaged, broken or overheat.
Stop charging immediately if there was a peculiar smell, smokes or leaks. In such cases
you shall sent the transmitter back to your dealer for after-sales service.

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Do not charge AK28 HD/HD+ transmitter when temperature is high or battery
temperature is over 60℃.
DANGER
Keep AK28 HD/HD+ away from any places that babies or kids may reach easily while it is
under charging, better there is supervision from an adult in case of emergency.
You can also stockpile spare batteries for AK28 HD/HD+ transmitter and charge up
to three AK28 HD/HD+ batteries through a professional battery charging hub
designed and manufactured by SIYI.
The spare batteries and the battery charging hub are sold separately.

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1.4 Precautions on Using SD Card
Do not disassemble, bend, press, abandon or damage SD card by any means.
Stop using the SD card if you find it soaked by water, oil or any other chemical liquid.
CAUTION
A SD card is also an electronic product, keep it away from static electricity.
Keep the Micro-SD card slot clean in case of blocking by sand or dirt.
Keep the SD card in slot while you are downloading or uploading data; taking out it
mistakenly, hitting it or shattering it may cause damage or data loss.
Keep the SD card away from places that a baby or a kid may reach in case that it was
swallowed mistakenly by the baby/kid.
1.5 How to Use SIM Card on AK28 HD/HD+
Coming soon
1.6 Precautions on Storage/Carrying/Recycling
CAUTION
Always place your AK28 HD/HD+ transmitter at places where babies or kids do not reach.

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DANGER
AK28 HD/HD+ transmitter should be placed as below:
Not too hot (above 60℃) or too cold (under -20℃);
Not under direct sunshine or too dusty or too wet;
Not on an unstable holder which lacks of solid supports or may cause vibration;
Not nearby steam or other heat sources.

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2 PRODUCT INTRODUCTION
2.1 Product Features
1080P HD Digital Video Transmission
Integrated with an HD digital video transmission system, the AK28 HD/HD+ is
equipped with both HDMI and Ethernet ports for the most flexible video stream input.
Making the system available to more cameras, gimbals, and multi-functional pods.
The built-in FPV application supports a floating window for video image display over
any ground control systems. Images can be zoomed in and out with the app. In
QGroundControl, the video images are perfectly displayed in the system without the
need for an additional app.
Extremely Long Transmission Distance
Using the brand-new video transmission system which is applied with advanced
anti-interference RF algorithm, the control distance of AK28 HD can reach up to 5
kilometers, of AK28 HD+ it can reach up to 15KM. The world is widely open for you
now!
iUAV OS Customized Operating System
Powered by Android, the iUAV OS is an improved operating system built on deep
knowledge of drone user requirement. This provides a positive user experience,
improved stability, convenience and efficiency. There are many hardware

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extensions ports on AK28HD/HD+ which will lead to infinite possibilities, to explore
more uses and drone applications. The AK28 HD/HD+ SDK will be shared with the
global development community for their secondary development.
QGroundControl
QGroundControl users can check their live video stream on the ground station
directly. Switching between the video image and the map view fast and freely.
Industry-level Protection
Considering the complicated working conditions of agricultural drones outdoors, the
completely waterproof and dustproof process has been done to key connectors on
AK28 operating panel, such as the shell, the switches, external ports, etc. With this
process, the controller and its system can still work in smooth and stable
performance despite how bad the environment could be.
High Brightness & Resolution LCD Screen
Under direct sunlight, you can still have a clear view of real-time screen display due
to AK28 HD/HD+'s 7-inch, high brightness, and high definition LCD screen.
Replaceable High Capacity LiPo Battery
AK28 HD/HD+ uses the same high capacity lipo battery for top-class smartphone
brands. The battery features low internal resistance, long working time, and an

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excellent power curve for the operating system. These are the exactly cool features
which most drone operations require, especially the long-lasting ones.
The Pursuit of Perfect Industrial Design
A Product with Quality and Dignity
AK28 series are not merely hardware with open system, but also carriers of various
tastes and free branding. Metallic operating panel with various choices of color can
be perfectly compatible with your drone design. And laser logo helps you a lot with
promoting your brand.

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2.2 Parts
2.2.1 At a Glance
Mark: Press and hold the power button three seconds to power on AK28 HD/HD+
transmitter.

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2.2.2 Button/Switch Types and the Default Channel Definitions
AK28 HD/HD+ transmitter has 16 channels in total. Each channel is controlled by
an independent switch or button. Please refer to the form below for the default
channel definitions from channel 1 to 16.
Channel
No.
Joysticks /
Buttons / Switches
1
Joystick J1
2
Joystick J2
3
Joystick J3
4
Joystick J4
5
3-Stage Switch SA
6
3-Stage Switch SB
7
3-Stage Switch SC
8
3-Stage Switch SD
9
3-Stage Switch SE
10
3-Stage Switch SF
11
Left Dial LD1
12
Right Dial RD1
13
Self-Reset Button
S1
14
Self-Reset Button
S2
15
Left Dial LD2
16
Right Dial RD2
Mark: Self-locking button stays in the position you press them to; Self-resetting button
rebound to original position after a press.

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Mark: AK28 HD/HD+ transmitter supports customized channel definitions as well.
Please refer to the chapter “SIYI TX APP” in this manual for detail.
2.2.3 Ports on AK28 HD/HD+
Port Function
AUDIO: Audio output.
DATA: Upgrading transmitter firmware.
SIM Card: Insert your SIM card to use cellular network.

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SD Card: Insert your SD card to read and storage files.
Charging Indicator: Check charging status of your transmitter.
Micro-USB: Charging, file transferring, upgrade Android system.
2.3 Technical Specification
Overall
Channels
16 Channels
Applicable Model
Planes / Helicopters / Gliders / Quadcopters / Multi-rotors /
Vehicles / Boats / Robots
Compatible FC
Open Source Flight Controllers: PIX/APM, etc.
Joystick Resolution
4096 grades
Frequency Band
Radiolink & Telemetry: 2400 MHz ~ 2483 MHz
HD Video Transmission: 5100 MHz ~ 5800 MHz
HD+ Video Transmission: 1427 ~ 1447 MHz
Radiolink & Datalink
Range
15 km / 9.3 miles (unobstructed, free of interference)
Videolink Range
HD: 5 km / 3.1 miles (unobstructed, free of interference)
HD+: 15 km / 9.3 miles (unobstructed, free of interference)
Video Quality
1080p
Battery Type & Watt
Hour
Replaceable and Chargeable 3.7V 12690mAh Li-Po 1S
Battery
47 Wh
Battery Life
HD: 4 Hours
HD+ 3 Hours
Charging Port Type
Micro-USB (5V/2A)
Wireless Type &
Function
2.4GHz (radiolink/datalink)
HD: 5.8GHz (videolink)
HD+:1.4GHz (videolink)
Bluetooth (datalink communication)
WIFI (internet)
Packing Size
37x27x18 cm
Packing Weight
2.9 kg (3.5kg by volume)

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Ground Station (Transmitter)
Operating System
Android 7.0
2G RAM & 16G ROM
Screen Type
7-inch High Brightness LCD Screen
Battery Type
& Watt Hour
Replaceable & Chargeable 3.7V 12690mAh Li-Po 1S
Battery; 47 Wh
Duration
HD: 4 Hours
HD+ 3 Hours
Battery Working
Temperature
0 ~ 55 (℃)
Charging Port Type
Micro-USB; 5V/2A
Charging Time
About 9 hours (through Micro-USB)
5 hours (3 batteries through charging hub)
Dimensions
308 x 148 x 72 mm (antennas folded)
Net Weight
1300 g
Sky Station (Receiver)
Signal Output
14 channels of SBUS, 5 channels of PWM
Datalink Ports (to FC)
UART, CAN (optional)
Video Input
Ethernet Port / HDMI
Antenna Gain
5 dBi
Working Voltage
15 – 50V
Telemetry Voltage
15 – 50V
Operating Temperature
-10 to 55 (℃)
Dimensions
61 x 60 x 21 mm (without antenna)
Net Weight
82g (without antenna)

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HDMI Converter
Camera Port
Micro HDMI
Standard HDMI (optional), Mini HDMI (optional)
Video Input
Micro HDMI
Operating Temperature
-10 to 55 (℃)
Dimensions
82 x 65 x 17 mm
Net Weight
62 g
2.4 Packing List
AK28 HD
1 x AK28 HD Transmitter
1 x AK28 HD Sky Station
4 x 5.8G Rod Antenna (along with 3 x extension feeder)
3 x 2.4G Rod Antenna (along with 2 x extension feeder)
1 x 4-pin Data Cable / Flight Controller Cable
1 x 8-pin Ethernet Camera Cable
1 x OTG Micro-USB Cable
1 x USB Charger (5V/2A)
1 x Upgrading Tool
1 x Strap Belt
1 x Storage Case

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AK28 HD+
1 x AK28 HD+ Transmitter
1 x AK28 HD Sky Station
4 x 1.4G Rod Antenna (with 3 x extension feeder)
3 x 2.4G Rod Antenna (with 2 x extension feeder)
1 x 4-pin Data Cable / Flight Controller Cable
1 x 8-pin Ethernet Camera Cable
1 x OTG Micro-USB Cable
1 x USB Charger (5V/2A)
1 x Upgrading Tool
1 x Strap Belt
1 x Storage Case
1 x Battery Charging Hub (with AC adapter)
Optional
1 x HDMI Converter (with Micro HDMI Data Cable)