Transmisor e receptor de vídeo sen fíos COFDM

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COFDM Wireless video transmitter and receiver Dimension

2-watt PA COFDM Wireless Video Transmitter

tamaño: 90x 65 x 22 mm

cofdm video transmitter
Length of 2-Watts cofdm video transmitter
cofdm digital video transmitter
Width of 2-Watt cofdm digital video transmitter
cofdm hd wireless transmitter
Hight of 2-watt cofdm hd wireless transmitter

The most recent advancements in COFDM (Multiplexación por división de frecuencia ortogonal codificada) wireless video transmitter and receiver technology have transformed how video is transmitted and received. COFDM is a modulation technique that allows digital data to be transmitted over a wide range of frequencies, resulting in a more reliable signal and improved data transmission.

We use COFDM technology in numerous applications, such as digital television, transmisión de vídeo sen fíos, e radio dixital. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.

finalmente, recent advancements in COFDM wireless video transmitter and receiver technology have transformed the way video is transmitted and received. This technology has enabled high-definition video transmission over wireless networks, as well as video transmission over a variety of networks and devices. The use of advanced coding techniques, such as forward error correction (FEC) and adaptive modulation, has enabled this.

cheapest-COFDM-wireless-video-transmitter-and-receiver-full-set-in-the-package
cheapest-COFDM-wireless-video-transmitter-and-receiver-full-set-in-the-package

5-watt PA COFDM Wireless Video Transmitter

COFDM Wireless Video Transmitter and Receiver 1
COFDM-912T-5-watts-PA-cofdm-wireless-video-transmitter-and-receiver
COFDM-912T-5-watts-PA-cofdm-wireless-video-transmitter-and-receiver
3-sets-of-5-watt-PA-COFDM-912T-Wireless-Video-Transmitter
3-sets-of-5-watt-PA-COFDM-912T-Wireless-Video-Transmitter
COFDM Wireless Video Transmitter and Receiver 2

5-Watt PA COFDM-912T Weight

Package for one full set of the COFDM Wireless Video Transmitter

COFDM-Wireless-Video-Transmitter-and-Receiver-with-80cm-RX-antenna-package-details
COFDM-Wireless-Video-Transmitter-and-Receiver-with-80cm-RX-antenna-package-details

FAQ of the COFDM Wireless Video Transmitter and Receiver


ola, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.

Would you like a Unha dirección ou bidireccional sistema? As long as you need to send the video, do you still need to send the control operation of the drone?

Only transmit and receive in a surveillance center. The idea is to use the HDMI output of the remote control and retransmit it to the central. The drone has a system to transmit over the internet, but there is no internet in the desert, so we need to retransmit but not with the internet.

Ok, 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.

Does this COFDM wireless video transmitter and receiver have AES 256 ou 128 cifrado? the output format is full hd?

si, COFDM-912T supports AES 128 cifrado. 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

Can it reach 30 km around?

In the introduction of the wireless video transmission system, all the transmission distances mentioned are based on the visible range (THE). 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. polo tanto, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:

1. Try to use a high-power transmitter, como 10 vatios ou 20 Vatios. 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.
COFDM Wireless Video Transmitter and Receiver with 1.8 meter omnidirectional FRP antenna Yagi directional antenna

3. If conditions permit, un repetidor 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.

How to assemble the wireless video transmitter, cámara, and battery?

Comprobe a imaxe de abaixo.
COFDM drone video transmitter camera battery assemble conneciton
There are two power connectors at the transmitter, the red connector is 12V output for the camera, and the black connector is 12V input.

What is the lag or delay in milliseconds of your COFDM-912T?

200-300ms with a regular camera and monitor.
Normal camera and screen have a delay of 200 milisegundos, dereito?
With our 100 milisegundos, it’s about 300 para 400.
We also have one with 30 milisegundos, but the price is 6 times that
300 milliseconds is acceptable if your plane has an automatic obstacle avoidance function.

I noted your transmitter can support up to 30 kilometers in LOS. How far will it support in the NLOS environment?

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.

We are a company that offers a solution to some rural areas here in the Philippines to monitor their rivers. If we purchased a 2W(30km) in the NLOS location, it could be reduced to 20km or more?

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.

Buyer: 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.

Can the COFDM-912T TX device output separate serial data?

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).

I would like to know if the transmitter can also output serial data on what the camera is capturing. Other than RF does it have a separate rs232 output for the transmitter?

si, COFDM-912T supports transferring the serial data for you. Comprobe a imaxe de abaixo.
wireless transmitter board

In this module where I can put up the camera? What type of camera is suited for this device?

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.

How can I let the transmission still work well if I remove the menu and panel board from the receiver?

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.
Wireless Video Transmitter and Receiver remove the menu and panel board
resposta: 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.

If GPS and TX are separated less than 1 metro – GPS is jammed. COFDM-912T has significant noise in GPS l1 and l2 freq. Do you have any low-pass filters to solve this problem?

ola! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
external low-pass filter and IC of low-pass filter to add on the transmitter board

resposta:
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?”, resposta: max 0.6db

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

COFDM-912T Customize Development

2 Watts default 595Mhz with 1.8-meter transmitter and receiver antenna

The client told us that his application details, the transmitter and receiver, are both used on the ground. In order to enhance the wireless transmission distance and avoid other signal interference, I recommend that both the transmitter and receiver antennas use 1.8-meter fiberglass antennas.

It was the first time the customer took the sample for testing, so he used the default two-watt amplifier and 595 MHz frequency.

The customer requires that the transmitter have an HDMI output so that he can transmit the received video to other devices. Ó mesmo tempo, in order to support HDMI input, I also matched an HDMI to CVBS RCA AV converter box.

The customer has added an optional parameter adjustment tool, the main function of which is to modify the transmitter’s transmission frequency and impedance. You can also add a password to the wirelessly transmitted video to encrypt the video of the transmitter. We must enter the same password on the receiver to decode the video to improve the security of the video.

cofdm transmitter
transmisor COFDM
cofdm video transmitter with 1.8 meter transmitter and receiver antenna2
COFDM video transmitter-receiver with two 1.8-meter antenna
COFDM Transmitter receiver feed cable length
COFDM Transmitter receiver feed cable length

Change COFDM Transmitter to 200 mW PA, with a power switch of the cooling fan for body wear

Customize a video on-off switch on the COFDM Transmitter for audio-only wireless transfer.

Here is the test video for this client’s requirement, added a video on-off switch at the 10-watt PA wireless video transmitter to transfer the audio only.

Here is a video to show you that we can add one video on-off switch on the COFDM wireless video audio transmitter.
Video on, then the transmitter will transfer the video and audio at the same time.
Video off, then the transmitter will transfer the audio only.
If you have any project or need to customize the function of the wireless video transmitter and receiver, póñase en contacto connosco.
The default power amplifier is 2-watt, we also make a 10-watt PA inside, to support long-range and transfer more extended distances.

2 Watts default 595Mhz with Yagi Directional Antenna and Omnidirectional antenna

COFDM-912T-Wireless-Video-Transmitter-with-parameter-tool-feeder-cable-TX-antenna
COFDM-912T-Wireless-Video-Transmitter-with-parameter-tool-feeder-cable-TX-antenna

300 Watts power amplifier modified 230Mhz COFDM wireless video transmitter and receiver

230Mhz work frequency cofdm video transmitter at 300 mill watts
230Mhz work frequency cofdm video transmitter at 300 mill watts
COFDM Transmitter customize 230Mhz and 420Mhz
COFDM Transmitter customized 230Mhz and 420Mhz
5-watt power amplifier transmitter and cofdm wireless video receiver
5-watt power amplifier transmitter and COFDM wireless video receiver
420Mhz-COFDM-Wireless-video-receiver
420Mhz-COFDM-Wireless-video-receiver

Preguntas frecuentes

1. Podo cambiar a frecuencia do transmisor e do receptor? Pode funcionar 260 banda de MHz?
  1. si, o rango de frecuencia pódese cambiar de 170Mhz (mellor a partir de 220 Mhz) ata 860 MHz. Polo tanto, pode funcionar ben na banda de 260 Mhz.
  2. A frecuencia debe modificarse á mesma no transmisor e no receptor. De causa, o amplificador de potencia e a frecuencia da antena deben modificar a mesma frecuencia. (Debes mercar un amplificador de potencia e unha antena para o transmisor e o receptor para cumprir coa túa frecuencia modificada).
  3. Co fin de mellorar a sensibilidade de transmisión e recepción, o ancho de banda de frecuencia é xeralmente moi estreito (frecuencia central ±15MHz, polo que o ancho de banda debe ser de 30 Mhz). O amplificador de potencia do transmisor e a frecuencia da antena están especialmente personalizados segundo a frecuencia que necesites.
  4. É mellor cando fas un pedido, por favor, dime que tipo de frecuencia de traballo necesitas. Os nosos enxeñeiros modificarán a frecuencia do transmisor e do receptor, e tamén modificar a PA e a antena personalizada segundo este rango de frecuencias para garantir a mellor sensibilidade e soportar a distancia de transmisión máis longa.
  5. A frecuencia predeterminada é 590 Mhz, Con 30 Mhz (+/-15MHz), pode cambialo sen modificar o amplificador de potencia e a antena. Por exemplo, 578MHz, 584MHz, 590MHz, 596MHz, e 602 Mhz.
  6. Se precisa modificar a frecuencia do transmisor e o ancho de banda, precisa unha ferramenta especial da tarxeta de configuración de parámetros, por favor vexa a imaxe de abaixo, non é un accesorio predeterminado, compreo cun custo adicional ou póñase en contacto connosco antes de realizar o pedido.

parameter configure board tool for transmitter
ferramenta de configuración de parámetros para o transmisor

si, admite enviar o vídeo e os datos UART do transmisor e do receptor.
Xa que é transmisión unidireccional, polo que non pode enviar o comando de control do receptor ao transmisor.

Se precisa enviar comandos de control ou outros datos do receptor para controlar outros dispositivos como cámaras ou drones no transmisor, pode engadir un conxunto de equipos de transmisión dixital baratos, Contacta connosco, e podemos personalizalo para ti.

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-dou-way-transmisor-receptor

Comprobe a definición de UART no transmisor e receptor na seguinte ligazón. Por favor, dime se queres ter un cable de plomo. (predeterminado é non)

Drone wireless video transmitter UART connection define for data transmission
Transmisor de vídeo sen fíos para drones Conexión UART definida para transmisión de datos

drone wireless video receiver UART connection define for data transmission
Drone receptor de vídeo sen fíos conexión UART definir para a transmisión de datos

O amplificador de potencia predeterminado do transmisor é 2 Vatios, para que poida soportar 30 KM na liña de visión.

A seguinte imaxe é a nosa distancia probada dende a montaña ata a beira do mar.

Se queres transmitir un alcance máis longo, pode aumentar o amplificador de potencia. Ademais dun watt e dous watts, tamén podemos facer 5 watts, 10 watts, e 20 vatios para a súa elección. Os amplificadores máis grandes tamén requiren baterías máis grandes e soporte actual.

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

Para 20W PA, a fonte de alimentación debe ser de 24 ~ 28 V. Só ás 28 voltios pode o amplificador de potencia acadar a mellor traballabilidade.

O noso enxeñeiro pode cambiar a frecuencia a 300 Mhz desde os 590 Mhz predeterminados, A antena, e PA no almacén son 590Mhz, 300Mhz necesita dúas semanas para personalizar, polo que o prazo de entrega necesita máis que os nosos 590 Mhz predeterminados.

si, admite entrada de vídeo CVBS 720P no transmisor e saída de vídeo HDMI 1080P no receptor.
Se a túa cámara é un conector HDMI, pode usar unha caixa de conversión de vídeo HDMI a CVBS, será moito máis barato do que utilizaches un transmisor de vídeo sen fíos.
HDMI to CVBS AV video converter box
Se aínda necesitas entrada HDMI no transmisor, entón recoméndase o seguinte modelo.
OFDM Wireless Video Transmitter
Tamén se recomenda COFDM-908T.

Paso 1: Preme Aceptar e o botón dereito ao mesmo tempo, aparece na pantalla un menú sobre se gardar.

COFDM Wireless Reciever save parameter
Parámetro de gardado do receptor sen fíos COFDM

Paso 2: Preme Aceptar para escoller Si para gardar.

wireless video receiver adjust parameter
parámetro de axuste do receptor de vídeo sen fíos

si, pode cambiar a frecuencia a 300 Mhz, pero isto non é recomendable.
Por que?
1. O noso transmisor e receptor de vídeo sen fíos admiten o cifrado e o descifrado AES128. O contrasinal pódese cambiar no taboleiro de configuración en calquera momento. É seguro para o teu vídeo.
2. Se cambia a frecuencia do transmisor e do receptor a 300 Mhz, a antena e a frecuencia do amplificador de potencia tamén deben cambiarse a 300 Mhz.
Para un pequeno número de antenas de frecuencia especial, quizais a fábrica de antenas non estea de acordo con produtos especiais.
3. Quizais se solucione o problema da antena. O amplificador de potencia do transmisor está preestablecido, e tamén che enviamos o vídeo de proba antes da entrega. Se o usuario final modifica a frecuencia do amplificador de potencia, é fácil queimar. Sen amplificador de potencia, entón este sistema non pode funcionar ben a longa distancia. O comprador ten que devolvelo á fábrica de China para a súa reparación, Aínda que a nosa reparación é gratuíta, pero o comprador ten que pagar todos os gastos de envío.
4. Indícanos que frecuencia quere ter o comprador, modificaremos e probaremos a súa calidade na fábrica. despois de pasar o control de calidade, enviarémosche.
COFDM-912T é un Unha dirección sistema de transmisión sen fíos.
Isto significa que só descarga o vídeo ou os datos do transmisor ao receptor, pero non pode cargar os datos UART do receptor ao transmisor, por exemplo, it can not control the transmitter's camera or drone.
É axeitado para o teu proxecto?
Ou comprobe o abaixo ligazón, entenderemos claramente o teu proxecto.
*
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COFDM-912T é un sistema de transmisión de vídeo unidireccional.
Se precisa controlar a cámara e o dron, cómpre escoller modelos bidireccionais.
Agora podemos ofrecerche a antena transmisora ​​máis pequena 13 cm en lonxitude.
Lembra, utiliza a antena máis grande ou máis longa se o teu proxecto o permite, pode obter un mellor rendemento de recepción no rango máis amplo.
13cm length cofdm wireless video transmitter antenna
13Antena transmisora ​​de vídeo sen fíos cofdm de lonxitude cm

O conxunto completo predeterminado

  1. Transmisor SD ( PA 0,5 W, 1W, 2W, 5W, 10W, 20W, 50W opcional segundo a súa demanda)
  2. Antena transmisora ​​SD
  3. Receptor de saída HDMI CVBS con menú de control de parámetros e pantalla pequena
  4. 0.8-antena receptora de medidor 1 pcs. (Hai dous tipos de instalación ou fixación da antena: 1. antena de base magnética, 2. defecto Antena de fibra de vidro FRP tipo U )
  5. opcional, placa de configuración de parámetros para o transmisor de vídeo sen fíos.

(Se necesitas unha antena de base magnética, o expreso ou o transportista pensa que os produtos magnéticos interferirán coa seguridade do seu avión, polo que o custo de envío é superior ao dunha antena tipo U. )

A dimensión predeterminada do paquete do conxunto completo

  1. 84*21*12CM
  2. Peso bruto 4,5 kg
  3. Se escolles unha antena de máis de 100 cm e unha antena de base magnética, Algúns transitarios cobrarán taxas adicionais, como tarifas extra longas e tarifas adicionais para artigos magnéticos fortes.

  1. A tarxeta de configuración de parámetros do transmisor é diferente do do receptor. O firmware da tarxeta de configuración de parámetros era diferente do transmisor e do receptor, non se poden usar indistintamente.
  2. A tarxeta de configuración de parámetros do transmisor pode axustar a atenuación do sinal no transmisor. Por 0,3 db reducirá o PA de 0,5 W.
Aquí está a tarxeta de configuración de parámetros do transmisor.
parameter configure board tool for transmitter
ferramenta de configuración de parámetros para o transmisor
Aquí está a tarxeta de configuración de parámetros do receptor.
COFDM Wireless Reciever save parameter
Parámetro de gardado do receptor sen fíos COFDM

Pregunta: É posible cambiar a potencia de saída (PA interno 0,5 w, 1 w, 2 w) a través da placa de configuración?

parameter configuration board tool for COFDM wireless video transmitter
ferramenta de tarxeta de configuración de parámetros para o transmisor de vídeo sen fíos COFDM
  1. Como respondeu anteriormente, pode axustar a potencia de saída configurando os parámetros de ATTEN a través da ferramenta da tarxeta de configuración de parámetros do transmisor. (Esta ferramenta non inclúe o paquete predeterminado, cómpre notificar que quere ter esta ferramenta cando faga o pedido)
  2. Se compras 2W PA, entón podes configuralo en 0,5 W, 1W, pero non pode cambialo a 5W.
  3. Tamén podemos facelo a 5W, 10W, 20W, e 50 W se precisa admitir longo alcance.

non.

Este transmisor de vídeo sen fíos só admite cámara CVBS ou entrada de vídeo, outro tipo de cámara de vídeo necesita unha caixa de conversión adicional.

non. É COFDM (DVB-T) tecnoloxía.

Polo tanto, o rango de frecuencia COFDM é 170-860Mhz. Pode apoiar 477, 610, 675, 724, 816MHz, pero non pode soportar 970, 1180, 1230 MHz.

O noso modelo de transmisor especial pode soportar todos os rangos anteriores, pero o receptor necesita usar o bloque downconverter.

Para permitir que o noso sistema de transmisión sen fíos admita un rango máis amplo e unha mellor intensidade de sinal, xeralmente establecemos a frecuencia de funcionamento nun determinado punto (170~860 MHz), e o seu rango admitido é só de máis ou menos 15 Mhz. Por exemplo, a frecuencia central é de 590 Mhz, O rango máximo de frecuencia de soporte debe ser de 575Mhz~605Mhz, O PA e a antena están especialmente personalizados segundo esta frecuencia central.

Aínda tes unha pregunta?

Póñase en contacto connosco para obter máis información.

Envía a túa pregunta

How to add a low-pass filter chip to the transmitter?

Some customers reported that when the distance between our transmitter and the GPS antenna is less than one meter, the transmitter will interfere with the work of the GPS through the transmitting antenna.

GPS satellite signals are divided into L1 and L2, with frequencies of 1575.42MHZ and 1228MHZ respectively. Our transmitter frequency is 595Mhz by default. If we encounter this situation, we can consider adding a low-pass filter, which means frequencies below 600Mhz. Frequencies above 600 MHz can be suppressed to avoid interference with other emitting electronic products.


There are two ways to add a filter. One is to add a filter IC to the COFDM-912T transmitter board, and the other is to add a filter box outside the transmitter. The down-pass filter can suppress frequencies below a certain frequency point, and the wave-pass filter can suppress the frequencies below a certain frequency point by allowing them to pass through.

How-to-add-the-low-pass-filter-to-COFDM-912T-transmitter-board-to-avoid-interfear-the-GPS-frequency
How-to-add-the-low-pass-filter-to-COFDM-912T-transmitter-board-to-avoid-interfear-the-GPS-frequency

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