COFDM 無線視訊發射器和接收器

Would you like a 單程 或者 雙向 系統? As long as you need to send the video, do you still need to send the control operation of the drone?

好的, our one-way long-range wireless video transmission solution is the base of COFDM technology (similar to DVB-T digital TV broadcasting). It is not on the base of the Internet.

是, COFDM-912T supports AES 128 加密. Please notify us to plus a Parameter Configuration board for setting the AES128 password when you are placing the order. It is optional to buy.

The COFDM-912T transmitter only supports SD720P Video input. So even if the receiver has HDMI output, it cannot output real 1080P high-definition video, only 720P.

If you have very high requirements on the definition of picture output, I suggest you choose a model that both the transmitter and receiver support 1080P, COFDM-908T

In the introduction of the wireless video transmission system, all the transmission distances mentioned are based on the visible range (LOS). The 2WPA power amplifier supports 30 kilometers and is usually used on drones. The altitude is very high and the receiver is on the ground, so there is an obvious height difference between the transmitter and the receiver, and the wireless signal is transmitted in accordance with the waveform. The signal loss is small and other interference is very little clutter.

You mentioned that your usage scenario is that both the transmitter and receiver are on the ground, especially in desert areas, and there may be rolling sand dunes. 所以, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:

1. Try to use a high-power transmitter, 例如 10 瓦特或 20 瓦特. Many of our ship customers use 20W transmitters.

2. Try to use a higher antenna or put the antenna on the roof or a nearby hill, and you can also increase the antenna tripod. Our clients always choose some 1.8-meter FRP omnidirectional fiberglass antennas.

3. If conditions permit, 一個 中繼器 can also be added to enhance the signal strength and increase the transmission distance. The repeater can be fixed at a high place or on the roof of a moving car.

請檢查下面的圖片.

There are two power connectors at the transmitter, the red connector is 12V output for the camera, and the black connector is 12V input.

200-300ms with a regular camera and monitor.
Normal camera and screen have a delay of 200 毫秒, 正確的?
與我們的 100 毫秒, it’s about 300 到 400.
We also have one with 30 毫秒, but the price is 6 times that
300 milliseconds is acceptable if your plane has an automatic obstacle avoidance function.

It’s hard to say the range of non-line-of-sight use, it depends on how many obstacles are in the middle. It is difficult to transmit if fully surrounded metal or mountains block it.
The test environment is unique, and the distance obtained from the test is also different. We can’t make any guarantees or promises about this.

It is hard to say, it should depend on the obstacles between the transmitter and receiver. We don’t test it in your use environment, So I can’t tell you.
The same product will be interfered with differently in different environments, and the transmission distance is hard to say. Only the actual test will know.

買方: Actually, we have installed a radio transceiver that gathers a data sensor and transmits its data to an 18km distance center command. The operation is smooth and ok.
The same place we’re going to put up the device that we will buy from you.
As you have said, only an actual test will answer all of my questions.

Data can only be transmitted in one direction from the transmitter to the receiver.
If you need to transmit data in both directions, you need to add a digital radio telemetry. (wireless data transceiver).

是, COFDM-912T supports transferring the serial data for you. 請檢查下面的圖片.

The black one on the left shows a little bit of the above picture, which is connected to the camera.
It supports a 720p CVBS composite AV camera. or any HDMI camera by HDMI to AV converter box.

Is there any way to disable the control panel so that the receiver can see the video from the transmitter?
If I remove the control panel on the receiver, the receiver does not see the signal from the transmitter.

回答: Please check the FAQ in the below link.
https://ivcan.com/p/cofdm-video-transmitter-receiver-av-in-hdmi-out/#accordion-item-6._i_have_changed_the_parameter_on_the_configure_board_tool,_why_it_is_not_saving_when_i_restart?

I guess that you did not save the frequency, after you remove the menu on the receiver, the system will be back to the default frequency of 340Mhz. So you can not get the signal.

你好! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.

回答:
1. If you buy it again, I can add a low pass filter in the transmitter inside free. I can also provide an external low-pass filter for you for free.

2. “Do you know what insertion loss is in non-filtered frequency?”, 回答: max 0.6db

3. “Do you know what dBm loss is pass frequency?” 0.4分貝