COFDM-912

FAQs

1. Can I change the transmitter and receiver frequency?

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.

Simplex-half-Duplex-full-duplex-wireless-video-data-Transmissions-method-one-two-way-transmitter-receiver
Simplex-half-Duplex-full-duplex-wireless-video-data-Transmissions-method-one-two-way-transmitter-receiver

Please check the UART define on the transmitter and receiver at the below link. Please tell me if you want to have a lead cable. (default is no)

Drone wireless video transmitter UART connection define for data transmission
Drone wireless video transmitter UART connection define for data transmission

drone wireless video receiver UART connection define for data transmission
drone wireless video receiver UART connection define for data transmission

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.

27km-test-distance-from-wireless-video-transmitter-and-receiver

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.
HDMI to CVBS AV video converter box
If you still need HDMI input on the transmitter, then the below model is recommended.
OFDM Wireless Video Transmitter

Step 1: Please press OK and the right button at the same time, a menu of whether to save appears on the screen.

COFDM Wireless Reciever save parameter
COFDM Wireless Reciever save parameter

Step 2: Please press OK to choose Yes to save.

wireless video receiver adjust parameter
wireless video receiver adjust parameter

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
13cm length cofdm wireless video transmitter antenna

The default full set

  1. SD Transmitter ( PA 0.5W, 1W, 2W, 5W optional according to your order demand)
  2. SD Transmitter antenna
  3. Dual Antenna HDMI CVBS output receiver with parameter control menu and small screen
  4. 1.2-meter Receiver antenna 2 pcs. (There are two types of installing or fixing the antenna: 1. magnetic base metal antenna, 2. U-type fiberglass antenna )
  5. Optional, parameter configuration board for the wireless video transmitter.

The default full seg package dimension

  1. 126*30*12CM
  2. Gross Weight 7.5KG
  3. Some freight forwarders will charge extra fees, such as extra long fees and extra fees for strong magnetic items

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TX900

FAQs

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, 1.2G, 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.

UI Wireless 1.4G
UI Wireless 1.4G

Regarding the RF cable, our engineer doesn't recommend that you used so long. There will be a reduced 0.5dB for one meter RF cable. For 3 meter RF cable, the signal strength will be reduced by 1.5dB.
In order to support long-distance at the, Can you use the RF cable is 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 pot, if your camera is HDMI or SDI or AHD, just plus one small encoder box to solve this problem. Please check the below model.

HDMI SDI AV input encoder IP RJ45 Ethernet output
HDMI SDI AV input encoder IP RJ45 Ethernet output

  1. 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.
  2. 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.

The package size is 125 x 23 x 11cm. Gross Weight:3.72KG, Volume Weight:7.5KG

Here is the full set picture.

15km 30km 80km 150km long-range-wireless-video-transmitter-receiver-full-set
15km 30km 80km 150km long-range-wireless-video-transmitter-receiver-full-set

Regarding frequency hopping, the engineer has some suggestions for you.

UI Advance
UI Advance

  1. 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.
  2. If 1410Mhz has jammed, then 1420Mhz also has jammed, as the frequency is too close.
  3. When hopping frequency, the data or video transmission will be disconnected, and your video will be frozen.
  4. At the normal time, it is better to choose hopping is NOT.
  5. 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.

Yes, it supports.
There are two solutions for the multi-transmitter cameras to one signal receiver.
multi-camera transmitter and receiver for ptz surveillance camera
multi-camera transmitter and receiver for ptz surveillance camera
1. 4 IP cameras -> Net Hub -> Transmitter <===> Receiver -> Computer Screen
2. 4 IP cameras -> NVR HDMI output -> HDMI encoder IP output -> Transmitter <===> Receiver -> computer screen.

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
Mini-SBUS-Conversion-Module-Uart-to-Sbus-Sbus-to-Uart-TTL-RS232

SBUS input UART TTL output and UART TTL input and SBUS output
SBUS input UART TTL output and UART TTL input and SBUS output

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