COFDM wireless video Transmitter mo e receiver
Fakahokohoko ʻo e Tohi
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Lahi 'o e: 90x65x22mm
The most recent advancements in COFDM (Tuʻo Lahi Hono Fakaʻaongaʻi ʻo e Ngaahi Meʻa ʻOku Fakaʻaongaʻi ʻi he Tuʻo Lahi Hono Fakaʻaongaʻi ʻ) 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, mo e letio fakaʻilekitulonika. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Fakaʻosi, 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
Malo e lelei, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.
Would you like a founga ʻe taha pe tafaʻaki ʻe ua polokalama? 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.
Lelei, 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 pe 128 encryption? the output format is full hd?
'Io, 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 (LOSI). 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. Ko ia, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, hange ko e 10 Watts pe 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, ha 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, me'a faitaa, and battery?
Kātaki ʻo vakaiʻi ʻa e fakatātā ʻi lal. 
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 naʻe ʻikai ke ʻi ai ha me, toʻomataʻú?
With our 100 naʻe ʻikai ke ʻi ai ha me, it’s about 300 ki he 400.
We also have one with 30 naʻe ʻikai ke ʻi ai ha me, 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?
'Io, COFDM-912T supports transferring the serial data for you. Kātaki ʻo vakaiʻi ʻa e fakatātā ʻi lal. 
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.
Tali: 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 mita 'e – 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?
Malo e lelei! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
Tali:
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?”, Tali: 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 he taimi tatau, 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, kātaki ʻo fetuʻutaki mai kiate kimautolu.
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
FAQS
- 'Io, ʻe lava ke liliu ʻa e tuʻo lahi mei he 170Mhz (lelei ange mei he 220Mhz) ki he 860Mhz. Ko ia ʻe lava ke ngaue lelei ʻi 260Mhz band.
- ʻOku totonu ke liliu ʻa e tuʻo lahi hono tohí ʻo tatau pē ʻi he transmitter mo e receiver. ʻO e ngāué, ʻoku totonu ke liliu ʻe he Power Amplifier mo e ʻenitena ʻa e tuʻo lahi tatau. (ʻOku fie maʻu ke ke fakatau ha malohi amplifier mo e ʻenitena ki he transmitter mo e receiver ke feau hoʻo liliu).
- Ke lava ʻo fakaleleiʻi ʻa e pelepelengesi ʻo hono ʻave mo hono maʻu, ʻOku faʻa fasiʻi ʻaupito ʻa e bandwidth (tuʻo lahi ʻa e senitaá ±15Mhz, ko ia bandwidth ʻoku totonu ke 30Mhz). ʻOku fakapatonu makehe ʻa e malohi amplifier ʻo e transmitter mo e tuʻo lahi ʻo e ʻenitena ʻo fakatatau ki he tuʻo lahi ʻoku ke fie maʻu.
- ʻOku lelei taha pe ia ʻi he taimi ʻoku ke fokotuʻu ai ha ʻota, Kataki ʻo talamai ʻa e faʻahinga ngaue ʻoku ke fie maʻu. ʻE liliu ʻe heʻetau kau ʻenisinia ʻa e tuʻo lahi ʻo e transmitter mo e receiver, pea toe liliu foki ʻa e PA mo e ʻenitena ʻo fakatatau ki he tuʻo lahi ko ʻeni ke fakapapauʻi ʻa e ongoʻingofua lelei taha mo poupouʻi ʻa e mamaʻo taha ʻo e feʻaveʻaki.
- Ko e default frequency ko e 590Mhz, Mo 30Mhz (+/-15Mhz), te ke lava ʻo liliu ia ʻo ʻikai fulihi ʻa e Power Amplifier mo e ʻenitena. Hange ko 'eni, 578Mhz, 584Mhz, 590Mhz, 596Mhz, mo e 602Mhz.
- Kapau ʻoku fie maʻu ke ke liliu ʻa e transmitter tuʻo lahi mo e bandwidth, ʻOku ke fie maʻu ha meʻangaue makehe ʻo e Parameter configure palakipoe, Kataki ʻo vakai ki he fakatata ʻi lalo, ʻOku ʻikai ko ha default ia, Kataki ʻo fakatau ia ʻi ha fakamole makehe pe fetuʻutaki mai kiate kimautolu kimuʻa pea toki ʻota.
'Io, ʻoku ne poupouʻi ke ʻave ʻa e vitioo mo e fakamatala UART mei he transmitter mo e receiver.
ʻI heʻene hoko ko e feʻaveʻaki ʻi ha founga pē ʻe taha, koeʻuhí ke ʻoua naʻá ne lava ʻo ʻave ʻa e fekau ʻoku ne puleʻi ʻa e fakamafolá ki he tokotaha ʻokú ne puke ʻa e fakamafolá.
Kapau ʻoku fie maʻu ke ke ʻave ʻa e ngaahi fekau pe fakamatala kehe mei he receiver ke puleʻi ʻaki ha ngaahi meʻangaue kehe hange ko e ngaahi meʻafaitaa pe drones ʻi he transmitter, te ke lava ʻo tanaki atu ha seti meʻangaue fakaʻilekitulonika ʻoku maʻamaʻa, fetu'utaki mai kiate kimautolu, pea te mau lava ʻo fakafeʻungaʻi ia maʻau.
Kātaki ʻo vakaiʻi ʻa e fakaʻuhingaʻi ʻo e UART ʻi he transmitter mo e receiver ʻi he fehokotakiʻanga ʻi laló. Kātaki ʻo talamai pe ʻokú ke fie maʻu ha keipolo taki. (peesi tuʻumaʻú ko e ʻikai)
Ko e default ʻa e transmitter Power Amplifier ko e 2 Watts, koeʻuhí ke ne lava ʻo poupouʻi 30 KM ʻi he laine.
Ko e fakatata ʻi lalo ko hotau mamaʻo ia mei he moʻunga ki he matatahi.
Kapau ʻoku ke fie ʻave ha ngaahi meʻa loloa ange, te ke lava ʻo fakatupulaki ʻa e malohi amplifier. Makehe mei he uati ʻe taha mo e Watts ʻe ua, te tau lava foki ʻo fai 5 Watts, 10 Watts, mo e 20 Watts ki hoʻo fili. ʻOku toe fie maʻu foki ʻe he amplifiers lahi ange ha puha ʻuhila lahi ange mo e tokoni lolotonga.
Maʻa e 20W PA, ʻOku totonu ke 24 ~ 28V ʻa e maʻuʻanga malohi. ʻI he 28 volts lava ʻe he malohi amplifier ʻo aʻusia ʻa e workability lelei taha.
ʻE lava ke liliu ʻe heʻetau ʻenisinia ʻa e tuʻo lahi ki he 300Mhz mei he default 590Mhz, Ko e ʻenitena, mo e PA ʻi he fale tukuʻanga koloa ko e 590Mhz, 300ʻOku fie maʻu ʻe Mhz ha uike ʻe ua ke fakafeʻungaʻi, ko ia ʻoku fie maʻu ke loloa ange ʻa e taimi ʻoku ʻomi ʻi heʻetau default 590Mhz.
Sitepu 1: Kātaki ʻo lomiʻi ʻa e OK pea ko e meʻa lomi toʻomataʻú ʻi he taimi tatau pē, ʻe ʻasi mai he screen ʻa e menu pe ʻe seivi.
Sitepu 2: Kātaki ʻo lomiʻi ʻa e OK ke fili ʻa e ʻIó ke seivi.
Fakamanatu, Kataki ʻo fakaʻaongaʻi ʻa e ʻenitena lahi ange pe loloa ange kapau ʻe fakaʻata ʻe hoʻo ngaue, ʻe lava ke toe lelei ange ʻene ngaue ʻi he ngaahi meʻa lalahi ange.
Ko e seti kakato ʻo e default
- SD Transmitter ( PA 0.5 W, 1W, 2W, 5W, 10W, 20W, 50W fili ʻo fakatatau ki he fie maʻu hoʻo ʻota)
- SD Transmitter ʻenitena
- HDMI CVBS Output ʻoku ne puke atu ʻa e Parameter Control menu mo e kiʻi screen siʻisiʻi
- 0.8-mita ʻo e receiver ʻenitena 1 pcs. (ʻOku ʻi ai ha faʻahinga ʻe ua ʻo e fola pe fakaleleiʻi ʻo e ʻenitena: 1. hiki fakamakinito sucker Base ʻenitena, 2. Peesi Tu'uma'u Faʻahinga ʻo e U-Type Wilder FRP fiberglass ʻenitena )
- Fili pe, Parameter fokotuʻutuʻu ʻo e papa ki he vitio wireless transmitter.
(Kapau ʻoku ke fie maʻu ha hiki fakamakinito sucker Base ʻenitena, ʻOku fakakaukau ʻa e tokotaha fetuku koloa ʻe uesia ʻe he ngaahi koloa hiki fakamakinito ʻa e malu ʻo ʻenau vakapuna, ko ia ʻoku maʻolunga ange ʻa e totongi fakafolau ʻi he faʻahinga ʻo e ʻIunaiteti Siteiti ʻenitena. )
Ko e peesi tuʻumaʻu ʻo e kofukofu kuo fokotuʻu
- 84*21*12SENITIMITA 'E
- Mamafa lahi 4.5 KG
- Kapau te ke fili ʻa e 100cm ʻenitena mo hiki fakamakinito sucker Base ʻenitena, ʻE ʻi ai ha ngaahi forwarders Totongi Feleti ʻe niʻihi te nau totongi ha ngaahi totongi lahi ange, hange ko e totongi loloa mo e totongi makehe ki he ngaahi meʻa hiki fakamakinito malohi.
- ʻOku kehe ʻa e transmitter Parameter configures palakipoe mei he taha ʻi he receiver. Naʻe kehe ʻa e firmware ʻi he poate Parameter configure mei he transmitter mo e receiver, he ʻikai lava ke fakaʻaongaʻi kinautolu.
- ʻE lava ke liliu ʻe he transmitter Parameter configures palakipoe ʻa e fakaʻilonga attenuation ʻi he transmitter. ʻE fakasiʻisiʻi ʻe he 0.3 b ʻa e 0.5 W PA.
Fehu'i: ʻOku malava nai ke liliu ʻa e malohi outpout (PA ʻi loto 0,5 w, 1 w, 2 w) ʻo fakafou ʻi he papa fokotuʻutuʻu?
- Hangē ko ia ʻoku tali atu ʻi ʻolungá, te ke lava ʻo liliu ʻa e malohi ʻo e Output ʻaki haʻo fokotuʻu ʻa e ngaahi fakangatangata ʻo e ATTEN ʻo fakafou ʻi he meʻangaue Parameter ʻi he transmitter. (ʻOku ʻikai kau ʻi he meʻangaue ko ʻeni ʻa e peketi ne ʻuluaki seti, ʻOku fie maʻu ke ke fakaha ʻoku ke fie maʻu ke maʻu ʻa e meʻangaue ko ʻeni ʻi he taimi ʻoku ke ʻota ai)
- Kapau te ke fakatau 2W PA, pea te ke lava leva ʻo fokotuʻu ia 0.5 W, 1W, ka he ʻikai ke ne lava ʻo liliu ia ki he 5W.
- Te tau lava foki ʻo aʻu ki 5W, 10W, 20W, mo 50W kapau ʻoku fie maʻu ke ke poupouʻi ha ngaahi.
'Ikai.
ʻOku poupouʻi pe ʻe he vitio wireless ko ʻeni transmitter ʻa e CVBS camera pe vitioo, ʻOku fie maʻu ʻe he faʻahinga meʻafaita vitio kehe ha puha fakaului kehe.
'Ikai. Ko COFDM (DVB-M) tekinolosia.
Ko ia ko e tuʻo lahi ʻo e COFDM ko e 170-860Mhz. Te ne lava ʻo poupouʻi 477, 610, 675, 724, 816Mhz, ka ʻoku ʻikai ke ne lava ʻo poupouʻi 970, 1180, 1230 Mhz.
ʻE lava ʻe heʻetau sipinga makehe transmitter ʻo poupouʻi ʻa e ngaahi feʻaluʻaki kotoa ʻi ʻolunga, ka ʻoku fie maʻu ke fakaʻaongaʻi ʻe he tokotaha ʻoku ne puke ʻa e konga downconverter.
Koeʻuhi ke lava ʻo fakaʻata ʻetau founga ʻave ʻo e wireless ke poupouʻi ha ivi lahi mo lelei ange, ʻOku tau faʻa fokotuʻu ʻa e tuʻo lahi ʻo e ngaue ki ha tuʻunga pau (170~ 860Mhz), pea ko hono ngaahi poupouʻi ʻoku tanaki pe ʻikai 15Mhz. Hange ko 'eni, ko e tuʻo lahi ʻo e senitaa ko e 590Mhz, ʻOku totonu ke 575Mhz ~ 605Mhz, ʻOku fakapatonu makehe ʻa e PA mo e ʻenitena ʻo fakatatau ki he tuʻo lahi ʻo e senitaa.
Kei ʻi ai pē haʻo fehuʻi?
Kātaki ʻo fetuʻutaki mai kiate kimautolu ke maʻu ha fakamatala lahi ange.
ʻAve Hoʻo FehuʻíHow 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.
