User manual for wireless video transmitter HD

Disclaimer

• Please read the user’s manual carefully before use. Be sure to pay attention to the warnings and understand all points completely.
• Please strictly abide by the local radio frequency management regulations.
• Please follow the installation steps in the manual to use this product. Our company and agent will not take legal responsibility for the damage of equipment or personnel caused by the installation and modification of users.
• This copyright of this manual belongs to Great Mainlink Tech Co., LTD. No one may make copies without written consent.

Caution                

Attention to installation                    

1. Before power on, make sure the antenna connection is reliably . Otherwise, it will cause damage to the device.

2. Make sure that the voltage is within the range of use.

3. Please pay attention to the EMC of all the electronic equipments on your drone.

4. It is recommended that the antenna should be installed downward and keep the antenna away from the metal on the drone.

5. Make sure to use the matching antenna.

Before use                                        

1. Make sure that all cables are connected correctly and firmly.

2. No foreign objects (e.g. liquids, sand, etc.) can be entered inside the device.

3. It takes 15 seconds for the device to start. Video and data cannot be transferred until the device has finished booting.

4. Please ensure that the environment in which the equipment is used is free of other electromagnetic interference.

5. When the signal weakens, you can improve the effect by changing the heading direction of the antenna.

Packing list

Device X 2

Overview

Industry drone market is developing very fast in recent years. The fight time and distance of drones are getting longer and longer. MK22/MK55, a long-range wireless transmission system, is designed for VTOL fixed wing and other long-range drones. The system can transmit video, fight control data, gimbal control data, and RC data simultaneously. With the advantage of high level intergration and powerful function, MK22/MK55 is a typical good product to meet long-range transmission requirements.

There are two frequency bands——800MHz、1.4GHz and 2.4GHz. Users can choose according to their needs. Please choose the suitable frequency band according to local regulations.

MK22 can transmit data and video to 22km, MK55 can transmit data and video to 55km, making it very suitable for long range drone.

If you use our recommend ground station, you only need one cable with connector to connect the device and your ground station.

^*1Test under LOS and no interference conditions。

Features

Long distance Modulation

-MK22  Up to 22km @ LOS          – OFDM

-MK55  Up to 55km @ LOS

Video interface Data interface

– Ethernet *1            – UART（TTL/RS232）/SBUS，

Hopping/Fixed Frequency Frequency Band

-Fixed: user defined   – 800MHz/1.4GHz/2.4GHz

-Hopping:  automatic   Working mode

BW – Air unit can be ：Point to point mode

-5/10/20 MHz   Repeater mode

Work temperature Power range

– 40℃～+70℃ – DC  9~28V  Battery 3S~6S

M52 Interface Description

Air unit  

side view

Ethernet

Number	Character	Description	Input/Output
1	T+	TX+	O
2	T-	TX-	O
3	R+	RX+	I
4	R-	RX-	I

2. UART1

Number	Character	Description	Input/Output
1	G	GND	I/O
2	R	RS232 RX	I
3	T	RS232 TX	O

3. UART2

Number	Character	Description	Input/Output
1	G	GND	O
2	R	TTL RX	I
3	T	TTL TX	O

4. Power

Number	Character	Description	Input/Output
1	G	GND	I/O
2	V	+Vcc（9v~28v）	I

5. SBUS1

Number	Character	Description	Input/Output
1	S	SBUS OUT	O
2	V	+5v（I max 1A）	O
3	G	GND	I/O

6. SBUS2

Number	Character	Description	Input/Output
1	S	SBUS OUT	O
2	V	+5v（I max 1A）	O
3	G	GND	I/O

7. Power indicator

This indicator is solid green when air unit is booting.

8. Link indicator

LED Pattern                       Description

solid green                     Wireless link is established

light off                         Wireless link is lost

9. Status Indicator

LED Pattern（Blink only in booting）       Description

Blink 2 times                  Initialization OK, Frequency is 1.4GBlink 1 time                   Initialization OK, Frequency is 800M

Blink 3 times                  Switch mode (Swith from air to ground, vice verse)

Blink slow all the time          Enter configuration mode

Blink fast all the time           Device abnormal

10. SMA antenna connector.

1. Fiber glass antenna.
2. OLED display.
3. Battery
4. Connector.

Number	Description	Input/Output
1	Rx+	I
2	Rx-	I
3	Tx+	O
4	Tx-	O
5	UART1 TX (RS232)	O
6	UART1 RX (RS232)	I
7	UART2 TX (RS232)	O
8	UART2 RX (RS232)	I
9	NC
10	RC1_IN	I
11	RC2_IN	I
12	+5v	O
13	GND	I/O
14	GND	I/O
15	GND	I/O
16	GND	I/O
17	GND	I/O
18	GND	I/O
19	Vcc (9v~28v)	I
20	Vcc (9v~28v)	I

Specification            

Category	Item	Detail
WirelessPerformance	Frequency band	800MHz/1.4GHz
	Frequency range	800MHz：806MHz～825MHz1.4GHz：1427MHz～1447MHz2.4GHz:  2400~2480MHz
	Band width	5MHz/10MHz/20MHz
	Modulation	OFDM
	EIRP	MK22: 30dBm±1dBMK55: 33dBm±1dB
	Sensitivity	≤-95dBm
	Range	MK22: 22kmMK55:55km*1
	Bit rate	30Mbps@20MHz
Power Range	DC 9~28V
Power consumption	≤8.5W
Interface	Antenna	SMA *2
	Power	XT30
	UART	TTL 3.3V，1 start bit, 8 data bit, 1 stop bit, no parity., Baud rate 115200（default），57600, 38400, 19200, 9600
		UART1 and UART2
	SBUS	SBUS_IN
		SBUS_OUT
	Ethernet	4 Pin
	Button	1
	Switch	For air and ground switch
Antenna	Interface	SMA
	Type	Air：Glue stick antenna  20cmGround：Fiber glass antenna, penal antenna
	Polarization type	Vertical
	Gain	Air：2.5dBiGround：12dBi
	SWR	≤2.0
Environment	Work temperature	-40℃～+70℃
	Storage temperature	-40℃～+85℃
	Humidity	5~95%，non-condensing
Appearance	Size	112 X 63.5 X 19 mm
	weight	143g