COFDM Wireless Video Transmitter ug Receiver
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COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Size: 90x65x22mm
The most recent advancements in COFDM (Gi-code nga Orthogonal Frequency Division Multiplexing) 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, wireless nga video transmission, ug digital radyo. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Sa katapusan, 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.
5-watt PA COFDM Wireless Video Transmitter
5-Watt PA COFDM-912T Weight
Package for one full set of the COFDM Wireless Video Transmitter
FAQ of the COFDM Wireless Video Transmitter and Receiver
hi, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.
Would you like a usa ka paagi o duha ka paagi 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 o 128 encryption? the output format is full hd?
Oo, COFDM-912T supports AES 128 encryption. 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 (ANG). 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. Busa, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, sama sa 10 Watts o 20 Watts. 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, sa usa ka repeater 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, camera, and battery?
Palihug susiha ang ubos nga hulagway. 
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 milliseconds, tuo?
With our 100 milliseconds, it’s about 300 sa 400.
We also have one with 30 milliseconds, 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?
Oo, COFDM-912T supports transferring the serial data for you. Palihug susiha ang ubos nga hulagway. 
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.
tubag: 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 metros – 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?
hi! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
tubag:
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?”, tubag: 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. Sa samang higayon, 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.
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, palihog kontaka kanato.
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
300 Watts power amplifier modified 230Mhz COFDM wireless video transmitter and receiver
Mga FAQ
- Oo, ang frequency range mahimong mausab gikan sa 170Mhz (mas maayo gikan sa 220Mhz) sa 860Mhz. Busa kini mahimong maayo sa 260Mhz band.
- Ang frequency kinahanglan nga usbon sa parehas sa transmitter ug receiver. Sa hinungdan, ang Power Amplifier ug frequency sa antenna kinahanglan nga usbon ang parehas nga frequency. (Kinahanglan ka nga mopalit ug power amplifier ug antenna para sa transmitter ug receiver aron matubag ang imong giusab nga frequency).
- Aron mapauswag ang pagkasensitibo sa pagpadala ug pagdawat, ang frequency bandwidth sa kasagaran gihimo kaayo nga pig-ot (sentro frequency ±15MHz, busa ang bandwidth kinahanglan nga 30Mhz). Ang power amplifier sa transmitter ug ang frequency sa antenna espesyal nga gipahiangay sumala sa frequency nga imong gikinahanglan.
- Labing maayo kung magbutang ka usa ka order, palihug sultihi ako unsa nga matang sa frequency sa pagtrabaho ang imong gikinahanglan. Ang among mga inhenyero magbag-o sa frequency sa transmitter ug receiver, ug usba usab ang PA ug naandan nga antenna sumala sa kini nga frequency range aron masiguro ang labing kaayo nga pagkasensitibo ug pagsuporta sa labing taas nga distansya sa transmission.
- Ang default frequency mao ang 590Mhz, Uban sa 30Mhz (+/-15MHz), mahimo nimo kini usbon nga dili usbon ang Power Amplifier ug antenna. Pananglitan, 578MHz, 584MHz, 590MHz, 596MHz, ug 602mhz.
- Kung kinahanglan nimo nga usbon ang frequency sa transmitter ug bandwidth, kinahanglan nimo ang usa ka espesyal nga himan sa parameter configure board, palihug tan-awa ang ubos nga hulagway, dili kini default accessory, palihog paliton kini sa dugang nga gasto o kontaka kami sa dili pa mag-order.
Oo, kini nagsuporta sa pagpadala sa video ug UART data gikan sa transmitter ug receiver.
Kay one-way transmission ra, mao nga dili kini makapadala sa control command gikan sa receiver ngadto sa transmitter.
Kung kinahanglan nimo nga magpadala mga control command o uban pang datos gikan sa receiver aron makontrol ang ubang mga aparato sama sa mga camera o drone sa transmitter, mahimo nimong idugang ang usa ka set sa barato nga kagamitan sa digital transmission, kontaka kanato, ug mahimo namong ipasibo kini alang kanimo.
Palihug susiha ang UART define sa transmitter ug receiver sa link sa ubos. Palihug sultihi ako kung gusto nimo adunay usa ka lead cable. (default kay no)
Ang transmitter default Power Amplifier mao 2 Watts, para makasuporta 30 KM sa line-of-sight.
Ang litrato sa ubos mao ang among gisulayan nga distansya gikan sa bukid hangtod sa baybayon.
Kung gusto nimo ipadala ang mas taas nga range, madugangan nimo ang power amplifier. Dugang pa sa usa ka watt ug duha ka watts, mahimo usab nato 5 watts, 10 watts, ug 20 watts para sa imong pilion. Ang mas dagkong mga amplifier nagkinahanglan usab og mas dagkong mga baterya ug kasamtangan nga suporta.
Alang sa 20W PA, ang suplay sa kuryente kinahanglan nga 24 ~ 28V. Lamang sa 28 volts makahimo sa power amplifier sa pagkab-ot sa labing maayo nga workability.
Our engineer can change the frequency to 300Mhz from the default 590Mhz, The antenna, and PA in the warehouse are 590Mhz, 300Mhz needs two weeks to customize, so the delivery time needs longer than our default 590Mhz.
Lakang 1: Palihug pindota ang OK ug ang tuo nga butones dungan, usa ka menu kung mag-save ba makita sa screen.
Lakang 2: Palihug pindota ang OK aron mapili ang Oo aron makatipig.
Pahinumdom, palihug gamita ang mas dako o mas taas nga antenna kung itugot sa imong proyekto, kini makakuha og mas maayo nga performance sa pagdawat sa mas dako nga range.
The default full set
- SD Transmitter ( PA 0.5W, 1K, 2K, 5K, 10K, 20K, 50W 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 buok. (Adunay duha ka matang sa pag-instalar o pag-ayo sa antenna: 1. magnetic sucker base antenna, 2. default U-type nga clamp FRP fiberglass antenna )
- Kapilian, parameter configuration board alang sa wireless video transmitter.
(Kung kinahanglan nimo ang usa ka magnetic sucker base antenna, ang express o carrier naghunahuna nga ang magnetic nga mga produkto makabalda sa ilang kaluwasan sa eroplano, busa ang gasto sa pagpadala mas taas kaysa usa ka U-type nga clamp antenna. )
Ang default full set nga dimensyon sa pakete
- 84*21*12CM
- Gross nga Timbang 4.5KG
- Kung gipili nimo ang labaw sa 100cm nga antenna ug magnetic sucker base antenna, Ang ubang mga freight forwarder maningil ug dugang bayad, sama sa dugang taas nga bayronon ug dugang bayronon alang sa kusog nga magnetic nga mga butang.
- Ang transmitter parameter configures board lahi sa usa sa receiver. Ang firmware sa parameter configure board lahi sa transmitter ug receiver, dili sila mahimong gamiton nga baylobaylo.
- Ang parameter sa transmitter nga nag-configure sa board mahimo’g mag-adjust sa pagpahinay sa signal sa transmitter. Matag 0.3db makapakunhod sa 0.5W PA.
pangutana: Posible ba nga usbon ang outpout power (internal nga PA 0,5 w, 1 w, 2 w) pinaagi sa configuration board?
- Ingon sa gitubag sa ibabaw, mahimo nimong i-adjust ang output power pinaagi sa pag-set sa mga parameter sa ATTEN pinaagi sa parameter configuration board tool sa transmitter. (Kini nga himan wala maglakip sa default nga pakete, kinahanglan nimo nga ipahibalo nga gusto nimo nga adunay kini nga himan kung nag-order ka)
- Kung mupalit ka ug 2W PA, unya mahimo nimo kini ibutang sa 0.5W, 1K, apan dili kini mausab sa 5W.
- Mahimo usab nato kini sa 5W, 10K, 20K, ug 50W kung kinahanglan nimo nga suportahan ang long-range.
Dili.
Kini nga wireless video transmitter nagsuporta lamang sa CVBS camera o video input, Ang ubang klase sa video camera nanginahanglan ug extra converter box.
Dili. Kini mao ang COFDM (DVB-T) teknolohiya.
Busa ang COFDM frequency range mao ang 170-860Mhz. Makasuporta kini 477, 610, 675, 724, 816MHz, apan dili makasuporta 970, 1180, 1230 MHz.
Ang among espesyal nga modelo nga transmitter makasuporta sa tanan nga mga sakup sa ibabaw, apan ang tigdawat kinahanglan nga mogamit sa downconverter block.
Aron tugotan ang among wireless nga sistema sa pagpasa sa pagsuporta sa usa ka mas lapad nga hanay ug mas maayo nga kusog sa signal, kasagaran atong gibutang ang operating frequency sa usa ka punto (170~860Mhz), ug ang gisuportahan nga range niini kay plus o minus lang nga 15Mhz. Pananglitan, ang sentro frequency mao ang 590Mhz, max nga suporta frequency range kinahanglan nga 575Mhz ~ 605Mhz, Ang PA ug antenna espesyal nga gipahiangay sumala sa kini nga frequency sa sentro.
Naa pay pangutana?
Palihug kontaka kami alang sa dugang nga impormasyon.
Ipadala ang Imong PangutanaHow 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.
