Dechoin DQVPT-020 User manual

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DQVPT-020
User’s Manual for HD Video Transmission System

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D i s c l a i m e r
Thank you for purchasing our HD video transmission product. Please be sure to use it in accordance with your local laws
and regulations. Please read this disclaimer carefully before using. Once it was used, it will be deemed you accepted all the
contents of this statement. Please follow this user’s manual to install and use strictly. Our company and related company
won’t bear any legal responsibilities for the results of improper usage,installation, modification and other man-made causes
by the user.
This user's manual copyright © Dechoin all rights reserved. Any forms of reproduction are forbidden without
authorization.
Product Precautions
This product belongs to wireless video transmission equipment. Please pay attention to the precautions carefully
to avoid the damage of the terminal equipment or the injury of ourselves caused by improper usage or operation.
Installation Notice
1. Be sure the antenna is installed before the transmitter is power on. Otherwise it will cause damage to the circuit.
2. Make sure the transmitter, receiver, power supply voltage is within a predetermined voltage range, otherwise it will cause
damage to the circuit.
3. Try to make the transmitter antenna is vertical down and no obstructions to avoid the communication distance is shortened
because of obstructing.
4. The transmitter antenna should be kept away from large pieces of metal parts.
5. Be sure to use the specified models of antennas to ensure that the parameters match the band impedance.
6. Keep a appropriate distance between the electronic devices When install, thereby reducing electromagnetic interference
between devices to a minimum.
Usage Notice
1. Make sure that all the cables are high fasten and interfaces are correct.
2. This product requires about 15 seconds to start up, and thereafter it can be used for image transmission.
3. Make sure there is no interference frequency from the high-power wireless transmission equipment in the surrounding
environment. Otherwise it may cause the receiver can not receive the image properly.
4. When the received signal of the ground is not so good, you can try to improve by changing the inclination direction of the
receiver antenna.
5. As for the matched HDMI cables, displays and other components, please try to use good electromagnetic shielding
performance products.
Product Introduction
Our wireless HD image transmission products, using the H.264 video code, COFDM digital modulation technology to overcome the poor
signals and unstable communication effects and other technical problems in the condition of Simulation technique and conventional
modulation technique. It can be implemented the real-time high-definition video transmission in the case of high-speed motion
shooting.
Detailed technical advantages as follow:
support single transmit to single receive, single transmit to multiple receive application mode;
long distance transmission, it can be up to 20Km;
HDMI video input and output, resolution up to 1080P60;
high environmental adaptability, working temperature range -30℃~ + 50 ℃

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Product Precautions
Our transmission system kits includes a transmitter, a receiver, and its related accessories.
Transmitter DQVPT-020T
Receiver DQVPT-020R
4dBi V0101T x1、Antenna x1
DC cable x1 、CVBS cable x1
V0102R x1，Antenna x2，DC cable x1、
A-frame*2
Product Interface Introduction
一、 Transmitter Interface Introduction
[1] channel indicator, when performing channel switching, channel
1, 2, ..., corresponding channel LED CH1, CH2, ...; Center frequency
is CH3.
[2] HDMI HD input interface, for connecting video sources;
[3] SMA female connector, for connecting the transmitting antenna;
[4] Anti-interference feedthru capacitor
power supply interface;
[5] SW hole site channel switch button, press
once to switch to the next channel to cycle;
[6] 3.5mm AV analogue signal source input
interface;
二、Receiver Interface
[1] SW hole site signal channel switch button. It can be adjusted to the next channel when you press one time. It
circulates according to the type of 1-2-3-4-1...It will search signal automatically,if you don’t press the button.
[2] CH1-CH4 receive signal indicator light. It can receive the signal normally when the light is green.

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[3] Feedthru capacitor DC power supply connector. It’s used for the power input.
[4] HDMI video output. It uses to connect the HD display and show the video received.
[5] SMA female connector. It used to connect the receiver’s antenna.
Product Installation Instructions
一、 Transmitter Installation Steps
1、The transmitter antenna should be mounted to the antenna connector, tighten in place and adjusted the antenna tilt to
the right direction;
2、Using a HDMI cable,one side is to connect the transmitter, and the other side is to connect the video source. Meanwhile make
sure the video source is on power;
3、Connect to DC 9 ~ 30V power supply, and the transmitter starts to send the signal after finishing the initialization;
二、 Receiver Installation Steps
1、The installation of the receiver antenna to antenna connector and tighten in place and adjust the antenna tilt to the
right direction;
2、Using a HDMI cable, one side is to connect the receiver, and the other side is to connect to a HDMI input port of high-
definition display ;
3、Connect DC 9~ 30V power supply. After the receiver initialization completes, you can receive the wireless signal from the
transmitter and output the video.

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Product Specification
Product Name
HD COFDM Transmitter
Model No.
DQVPT-020T
Working Frequency
500~520MHz (300~900MHz Customizable)
Interface of Antenna
50ΩSMA Female
Modulation format
COFDM
Transmitter
Performance
Video bit rate
2~6MHz
Bandwidth
6/8MHz
Latency
About 200~350ms
Encoding format
H.264
Image clarity
1080P @60/50/30 (Downward Compatible)
Input Voltage
DC9~30V
Audio input interface
Standard HDMI,AV
Power Consumption
≤10W @ Standard Power 1.3W
Transmission Rang distance
20km( with 7dBi receiving antenna);
Net weight (excluding antenna)
93g
Dimension
82.5*59.5*28.5mm
Product Name
HD COFDM Receiver
Model
DQVPT-020R
Working Frequency
500~520MHz (300~900MHz Customizable)
Interface of Antenna
50ΩSMA Female
Modulation format
COFDM
Receiver
Performance
Receiving Sensitivity
≤-98dBm
Bandwidth
6/8MHz
Video bit rate
2~5MHz
Encoding Format
H.264
Input Voltage
DC9~30V
Video Input Interface
HDMI
Power Consumption
≤4W
Dimension
107*88.5*20mm

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Network Port Output Setting
一． Plug in the transmitter and receiver’s power supply. Connect the receiver to the computer’s
RJ45 network interface.
二、Download VLC video player.
三、Set up player parameters.
1、Open player and select ＂open network stream＂.

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2、Set up network URL:
Type in: UDP://@224.1.1.1:8000
Note the format of input method, don’t have a blank space.
3. Set up Buffer:
4. Press OK after completing set, and watch video.
It’s normal that the delay of RJ45 network output is longer than HDMI because of difference data flow.

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General Problems and Solutions
Problem Description
Possible Causes
Solutions
Display lit but no picture
Channel receiver and transmitter channels is
inconsistent
Switching the receiver’s channel to the
same channel as the transmitter
The display does not switch to the HDMI input
Switch the display input channel to HDMI
The distance between the HDMI cable and
transmitter’s antenna is too close
Re-adjust the HDMI cable’s location, let it
be as far as possible from the transmitter’s
antenna; Or use a better shielded HDMI
cable
Display shows “Signal Loss”, it means there hasn’t
video source inputting from the transmitter.
Check video source and confirm if the
cables connected well.
The transmitter or receiver is not working
Try to restart the transmitter, receiver, or
video source camera
HDMI interface or cable failure
Contact the manufacturer to replace the
new HDMI interface, or replace with a new
HDMI cable
There is picture on display, but
picture color, clarity are
abnormal
Transmitter or receiver HDMI cable is not
connected
Reconfirm if the cable connects well.
The transmitter or receiver is not working
Restart the transmitter, receiver, or video
source camera.
The distance between transmitter and receiver is
too far or there are some obstructions
Shorten the distance between transmitter
and receiver, also ensure there is no
obstructions in the middle of them.
The tilted angle of the transmitter and the receiver
is be set unreasonable
Adjust the antenna of transmitter and
receiver to tilt to the optimal location.
HDMI interface or cable failure
Contact the manufacturer to replace the
new HDMI interface, or replaced with a
new HDMI cable