Yes, the frequency can be changed from 170Mhz to 860Mhz. The frequency should be modified to the same on the transmitter and receiver. Of cause, the Power Amplifier and antenna frequency should modify the same frequency. (You need to buy a power amplifier and antenna for the transmitter and receiver to meet your changed frequency).
The default frequency is 590Mhz, With 30Mhz (+/-15Mhz), you can change it without modifying the Power Amplifier and antenna. For example, 578Mhz, 584Mhz, 590Mhz, 596Mhz, and 602Mhz.
Yes, it supports to send the video and UART data from the transmitter and receiver. As it is one-way transmission, so it can not send the control command from the receiver to the transmitter.
If you need to send control commands or other data from the receiver to control other devices such as cameras or drones at the transmitter, you can add a set of cheap digital transmission equipment, contact us, and we can customize it for you.
The transmitter default Power Amplifier is 2 Watts, so it can support 30 KM at line-of-sight.
The below picture is our tested distance from the mountain to the seaside.
If you want to transmit a longer range, you can increase the power amplifier. In addition to one watt and two watts, we can also make 5 watts, 10 watts, and 20 watts for your choice. Larger amplifiers also require larger batteries and current support.
Our engineer can change frequency to 300Mhz from default 590Mhz, The antenna and PA in the warehouse are 590Mhz, 300Mhz need two weeks for customize, so the delivery time needs longer than our default 590Mhz.
Yes, it support 720P CVBS video input on the transmitter and 1080P HDMI video ouput on the receiver.
If your camera is HDMI connector, you can use one HDMI to CVBS video convertor box, it will be much cheaper than you used one wireless video transmitter.
If you still need HDMI input on the transmitter, then the below model is recommended.
Yes, you can change the frequency to 300Mhz, but this is not recommended.
Why?
1.Our wireless video transmitter and receiver both support AES128 encryption and decryption. The password can be changed on the configuration board at any time. It is safe for your video.
2. If you change the frequency on the transmitter and receiver to 300Mhz, the antenna and Power Amplifier frequency should be changed to 300Mhz also.
For a small number of special frequency antennas, maybe the antenna factory will not agree to special produce.
3. Maybe the antenna problem is solved. The power amplifier in the transmitter is preset, and we also send you the test video before the delivery. If the end-user modifies the power amplifier frequency, it is easy to be burned. Without a power amplifier, then this system can not be working well the long distance. The buyer has to send it back to the China factory for repair, Although our repair is free, but the buyer has to pay all the shipping costs.
4.Please tell us what frequency the buyer wants to have, we will modify and test its quality in the factory. after QC passed, we will send you.
COFDM-912T is a one-way wireless transmission system.
That means it only downloads the video or data from the transmitter to the receiver, but it can not upload the UART data from the receiver to the transmitter, for example, it can not control the transmitter's camera or drone.
Is it suitable for your project?
Or check the below link, we will understand clearly your project.
Now we can offer you the smallest transmitter antenna is 13 cm in length. Remind, please use the bigger or longer antenna if your project allows, it can get better reception performance in the larger range.
13cm length cofdm wireless video transmitter antenna
SD Transmitter ( PA 0.5W, 1W, 2W, 5W optional according to your order demand)
SD Transmitter antenna
HDMI CVBS output receiver with parameter control menu and small screen
0.8-meter Receiver antenna 1 pcs. (There are two types of installing or fixing the antenna: 1. magnetic base metal antenna, 2. U-type fiberglass antenna )
Optional, parameter configuration board for the wireless video transmitter.
The default full set package dimension
126*30*12CM
Gross Weight 7.5KG
Some freight forwarders will charge extra fees, such as extra long fees and extra fees for strong magnetic items
The power supply of this transmitter and battery both are [email protected]. At the normal time, the battery we used for tested is 7AH, it can work for 2~4 hours. If you buy15AH chargeable battery, it can work continuously for about 4~8 hours.
There is three frequencies to choose from 800Mhz, 1.4G, and 2.4G.
But there is no 10W Power Amplifier for 150km at 2.4Ghz. So if the buyer want to support 150km transmission distance, only 800Mhz and 1.2G can be chosen.
Not only switch the frequency at the web UI parameter easily, after changing the frequency, it also needs to change the Power Amplifier inside and the same frequency transmitter and receiver antenna. So buyer should confirm which frequency you need before delivery. The antenna is customized according to this frequency.
Regarding the RF cable, our engineer doesn't recommend that you used it so long. There will be a reduced 0.5dB for one meter RF cable. For 3 meters RF cable, the signal strength will be reduced by 1.5dB. In order to support long-distance, It is better that you use the RF cable less than 1 meter? In fact, the transmitter is very smaller, it is better to keep a short distance from the transmitter to the transmitter antenna. The power supply cable for the transmitter and ethernet cable from the camera to the transmitter can be longer as there are no losses like RF cable.
Yes, the default video input is IP RJ45 ethernet port, if your camera is HDMI or SDI or AHD, just plus one small encoder box to solve this problem. Please check the below model.
If your area has a DVB-T or DVB-T2 digital television signal, the TV frequency range is 170-860Mhz, it has including 800Mhz, so choose 1.4G is better.
Because the GPS antenna receives the GPS signal and the GPS direction on the drone is up, our transmitter antenna is pointing down to send the signal to the ground. As a result, the 1.4G frequency effect on GPS is negligible.
Regarding frequency hopping, the engineer has some suggestions for you.
UI Advance
As the system frequency range is 20Mb, if your bandwidth is chosen 20Mb, then it can not hop (only one point). If the bandwidth is chosen 10Mb, then you have two points to hop, if the bandwidth is chosen 5Mb, then you have 4 points to hop.
If 1410Mhz has jammed, then 1420Mhz also has jammed, as the frequency is too close.
When hopping frequency, the data or video transmission will be disconnected, and your video will be frozen.
At the normal time, it is better to choose hopping is NOT.
If your transmission distance is less than 15~22km, then we have another option to choose from, the frequency has 110Mb, and even if you choose 20Mb bandwidth, it has 5 points to choose from for frequency hopping.
If you need to support S.bus, then please tell us before shippment, and we will modify our RS232 to TTL.
Our TX900 has three RS232 ports. If you need it to support S.bus, just need plus one small converter from S.BUS to RS232 is ok. ( Mini SBUS Conversion Module Uart to Sbus, Sbus to Uart ).
Mini-SBUS-Conversion-Module-Uart-to-Sbus-Sbus-to-Uart-TTL-RS232 SBUS input UART TTL output and UART TTL input and SBUS output
The serial port of our wireless video transmission is transparent, and no data is actively sent to the flight controller. This is controlled by the ground station.
It won't send the failsafe command, but you can see the link status light from the signal indicator.
Here is the link status signal strength indicator means
Not Bright: Indicates that the wireless link of the module is not connected
Red: Indicates that the wireless link of the module has been connected, but the wireless signal strength is very weak
Orange: Indicates that the wireless link of the module has been connected, and the wireless signal strength is medium
Green: Indicates that the wireless link of the module has been connected, and the wireless signal strength is very strong
We understand that you hope to have this function, If aircraft loses signal during flight it will not return to home because flight controller will not understand that rc link is lost.
You need to see the link status LED light, if it is Orange or Red, you should control the plane back in advance.
At the normal usage, one node as the transmitter, another node as the receiver. If you need to support long range or over a mountain top, like the below picture, yes, please buy 3rd nord as the reapter. You just need to put the 3rd node in the middle and set the 3rd node be a 2D3U then ok.
replay repeater for wireless video transmitter and receiver
How to set 3rd node be 2D3U?
Set with AT command: at+cfun=0 at^dstc=0 at+cfun=1 Restart the link device after the operation
AT command operation postion UAV Video Link Drone Wireless Video Data Transmitter Receiver new 2023-
4K video is supported. 4K video stream generally has more than 8Mbps, and 1080P video generally has more than 2M, so the distance of our wireless video transmission when transmitting 4K video will be shorter than that of 1080P.
In one word, the higher the definition of the video, the shorter the transmission distance. The video compression is smaller, and the transmission distance is supported farther.
