COFDM Wireless Video Transmitter and Receiver
Tabula ohipa
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Rahi: 90x65x22mm
The most recent advancements in COFDM (Tuha'a numera roro uira tuha 'āpī i ni'a i te tuha'a pāpa'ira'a rorouira) 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 video transmission, e te ratio roro uira. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
I te pae hopea, 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
Aroha, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.
Would you like a hoê noa iho rave'a e aore ra, piti i ni'a i te te ravea a? 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 e aore ra, 128 faaîraa? the output format is full hd?
E, COFDM-912T supports AES 128 faaîraa. 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 (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. No reira, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, mai te huru 10 Te mau nota 20 Te mau āpōse. 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, te Taata a'o 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, pata hohoa, and battery?
A hi'o i te hoho'a i raro nei. 
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 faaî i te taata, ti'a?
With our 100 faaî i te taata, it’s about 300 no te 400.
We also have one with 30 faaî i te taata, 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(30kilometera) 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?
E, COFDM-912T supports transferring the serial data for you. A hi'o i te hoho'a i raro nei. 
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.
Pahonoraa: 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 meter – 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?
Aroha! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
Pahonoraa:
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?”, Pahonoraa: 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. I taua iho taime ra, 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, a farerei mai ia matou.
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
TE MAU NOTA
- E, e nehenehe te anairaa o te pinepineraa e tauihia mai te 170Mhz (maitai ae no roto mai i te 220Mhz) e tae atu i te 860Mhz. No reira, e nehenehe te reira e manuïa maitai i roto i te pǔpǔ faata'i upaupa 260Mhz.
- E mea ti'a ia tauihia te pinepineraa o te reira i ni'a i te matini nene'iraa e te taata farii. No ni'a i te tumu, e ti'a i te Power Amplifier e te antenna ia taui i te hoê â pinepineraa. (E mea ti'a ia outou ia hoo mai i te hoê tao'a haapuai reo e te antenna no te matini nene'iraa e te afata apo parau no te pahono i te mau tauiraa i roto i to outou oraraa.).
- No te haamaitai i te huru o te haponoraa e te fariiraa, i te rahiraa o te taime, e mea pirihao roa te tereraa o te ohipa (Te mau mana'o tauturu no te haapiiraa ±15Mhz, E 30Mhz). E faaohipa - taa - ê - hia te puai o te tao'a horoa e te pinepineraa o te antenna ia au i te pinepineraa o ta outou e hinaaro ra.
- E mea maitai a'e ia poro'i ana'e outou, a faaite mai na ia'u eaha te huru o te ohipa ta oe e hinaaro. E taui ta tatou mau taata aravihi i te pinepineraa o te matini haapurororaa e te taata farii, e a taui atoa i te antenna e te antenna ia au i teie anairaa pinepine no te haapapû i te huru maitai roa a'e e no te turu i te atearaa roa a'e o te haponoraa.
- E 590Mhz te default, E 30Mhz (+/-15Mhz), e nehenehe ta outou e taui i te reira ma te ore e taui i te Power Amplifier e te antenna. Ei hioraa, 578Mhz, 584Mhz, 590Mhz, 596Mhz, e 602Mhz.
- Mai te peu e e tia ia outou ia taui i te pinepineraa o te taime e te mau ravea haapurororaa, e hinaaro outou i te hoê mauhaa taa ê no te tabula o te mau pereoo uira, a hi'o i te hoho'a i raro nei, e ere i te hoê ohipa iti ha'iha'i noa, a hoo mai i te reira i te moni hau e aore râ a farerei mai ia matou hou a poro'i ai.
E, te turu nei oia i te haponoraa i te video e te UART data no roto mai i te taata nene'i e te taata farii.
Elder M. A. Rasetera, eita ïa te reira e nehenehe e hapono i te parau faati'a mai roto mai i te taata farii i te taata horo'a.
Mai te mea e, e titauhia ia outou ia hapono i te mau parau hi'opo'araa e aore râ, te tahi atu mau haamaramaramaraa no roto mai i te afata afata no te hi'opo'a i te tahi atu mau matini mai te pata hoho'a e aore râ, te mau pata hoho'a i ni'a i te matini, e nehenehe ta outou e tuu atu i te tahi mau matini no te hapono i te matini roro uira, a farerei atu ia tatou, e e nehenehe ta matou e faaohipa i te reira no oe.
A hi'o atu i te parau UART i ni'a i te matini haapurororaa e te afata apo parau i te hono i raro nei. A faaite mai na ia'u e, te hinaaro ra anei oe i te hoê niuniu tapau auri. (default is no)
The transmitter default Power Amplifier is 2 Te mau āpōse, ia ti'a ho'i ia'na ia paturu 30 KM i te reni-of-sight.
Te hoho'a i raro nei, o to tatou ïa atearaa mai te mou'a e tae atu i te hiti miti.
Mai te peu e e hinaaro outou e faatae atu i te hoê anairaa roa ' tu â, e nehenehe ta outou e faarahi i te puai. Taa ê atu i te hoê watt e e piti watts, e nehenehe atoa ta tatou e rave i te 5 Watts, 10 Watts, e te 20 Te mau mana'o tauturu no ta outou ma'itiraa. E titau atoa te mau haaparareraa parau rahi a'e i te mau topita rarahi a'e e te turu e vai ra i teie nei.
No te 20raa o te nene'iraa, e ti'a ia vai mai te mana 24~28V. I te 28 E nehenehe te mau matini e faatupu i te puai no te rave i te ohipa maitai roa a'e.
E nehenehe ta tatou taata aravihi e taui i te pinepineraa e tae atu i te 300Mhz mai te default 590Mhz, Te antenna, e 590Mhz i roto i te fare vairaa tao'a., 300E titauhia e piti hebedoma no te faaau ia Mhz, no reira, e titauhia hau atu â te taime fanauraa i ta tatou default 590Mhz.
Taahiraa avae 1: A taumi i te OK e te pitopito atau i te taime hoê, hoê tapura ohipa no te faaherehereraa e itehia ïa i ni'a i te paruai.
Taahiraa avae 2: A taumi i te OK no te ma'iti E no te faaherehere.
Faahaamana'o, a faaohipa i te antenna rahi a'e e aore râ maoro a'e mai te mea e, e faati'a ta outou opuaraa, e nehenehe te reira e riro ei ohipa maitai a'e i roto i te oraraa.
Te mau mana'o tauturu no te tuatapaparaa e te haapiiraa
- SD Transmitter ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50A ma'iti mai te au i ta oe aniraa)
- SD Transmitter antenna
- HDMI CVBS output e te tabula hi'opo'araa i te mau hoho'a e te mau paruai na'ina'i
- 0.8-meter Receiver antenna 1 pcs. (Te vai ra e piti huru tamauraa aore ra tata'iraa i te antenna: 1. te mau auri ovahine base antenna, 2. Parau U-type clamp FRP fiber antenna )
- Faahepo ore, tabula no te mau hoho'a video aita e niuniu paraparau.
(Mai te peu e e hinaaro outou i te hoê tao'a auri ovahine i raro a'e i te antenna, te mana'o nei te taata hamani hoho'a e, e haafifi te mau tao'a auri ovahine i to ratou manureva, no reira, e mea teitei a'e te moni hoo o te pahi i te hoê antenna U-type. )
Te faito taatoa o te puohu
- 84*21*12TENETIMETERA
- Pene 4.5KG
- Mai te peu e e maiti outou hau atu i te 100cm antenna e te auri ovahine i raro a'e i te antenna, E aufau te tahi mau taata hoo tauihaa i te mau tino moni hau, mai te mau haamâu'araa roa hau e te mau haamâu'araa hau no te mau tao'a auri ovahine puai.
- E mea taa ê te tabula haapurororaa i te hoho'a i ni'a i te afata apo parau. E mea taa ê te matini nene'iraa i ni'a i te tapura ereere i te taata horo'a e te taata farii, eita te reira e nehenehe e faaohipahia ma te taui haere.
- E nehenehe te iri haapurororaa e faatano i te tapao i nia i te haapurororaa. E faaiti mai te 0.3db i te 0.5W PA.
Uiraa: E nehenehe anei e taui i te mana o te ore e nehenehe e faaorehia (Te mau mana'o tauturu no te tuatapaparaa e 0,5 w, 1 w, 2 w) Na roto i te tabula no te mau hoho'a?
- Mai tei faaitehia i ni'a nei, e nehenehe ta outou e faatano i te puai o te matini na roto i te tuuraa i te mau faito o te ATTEN na roto i te mauhaa tama'i i ni'a i te matini haapurororaa. (Aita e vai ra i roto i teie mauhaa te puohu o te hape, e mea ti'a ia oe ia faaara e, te hinaaro nei oe i teie mauhaa ia poro'i ana'e oe)
- Mai te mea e, e hoo mai outou i te 2W PA, i reira e ti'a ai ia outou ia haamau i te reira 0.5W, 1W, eita râ e nehenehe e taui i te reira ei 5W.
- E nehenehe atoa ta tatou e rave i te reira i ni'a i te 5W, 10W, 20W, e 50W mai te mea e hinaaro outou i te turu i te mau mea e hinaarohia no te hoê tau roa.
Aita.
E turu noa teie matini haapurororaa video aita e niuniu uira i te pata hoho'a CVBS e aore râ te hoho'a video, e titau te tahi atu huru pata hoho'a video i te hoê afata hau atu.
Aita. E mea maere mau (DVB-T) te mau rave'a apî.
No reira, e 170-860Mhz te pŭpŭ COFDM. E nehenehe ta'na e paturu 477, 610, 675, 724, 816Mhz, aita râ e ti'a ia paturu 970, 1180, 1230 Mhz.
E nehenehe ta tatou hoho'a taa ê e turu i te mau tuhaa atoa i nia nei, tera râ, e mea ti'a i te taata farii ia faaohipa i te ofa'i hi'opo'a.
No te vaiiho i ta tatou faanahoraa niuniu ore ia turu i te hoê anairaa aano a'e e te puai a'e o te tapao, i te rahiraa o te taime, e tuu tatou i te reira i te hoê faito (170~860Mhz), e to'na anairaa i paturuhia, e mea na roto noa ïa i te minus 15Mhz. Ei hioraa, e 590Mhz te pû, e 575Mhz~605Mhz, Ua matau - taa - ê - hia te PA e te antenna ia au i te pinepineraa o teie pu.
Te vai noa ra te hoê uiraa?
A farerei mai na ia matou no te tahi atu mau haamaramaramaraa.
A hapono i ta outou uiraaHow 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.
