COFDM Wireless Video Transmitter ndi Receiver
M'ndandanda wazopezekamo
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
kukula: 90x65x22mm
The most recent advancements in COFDM (Coded 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, mavidiyo opanda zingwe, ndi wailesi digito. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Pomaliza, 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 njira imodzi kapena njira ziwiri dongosolo? 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.
Chabwino, 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 kapena 128 kubisa? the output format is full hd?
inde, COFDM-912T supports AES 128 kubisa. 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, Mtengo wa 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. Choncho, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, monga 10 Watts kapena 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 antennam.
3. If conditions permit, ndi wobwereza 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, kamera, and battery?
Chonde onani chithunzi pansipa. 
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, chabwino?
With our 100 milliseconds, it’s about 300 kuti 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?
inde, COFDM-912T supports transferring the serial data for you. Chonde onani chithunzi pansipa. 
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.
yankho: 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 – 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.
yankho:
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?”, yankho: 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. Nthawi yomweyo, 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, lemberani.
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
- inde, ma frequency osiyanasiyana amatha kusinthidwa kuchokera ku 170Mhz (bwino ku 220Mhz) ku 860 mhz. Chifukwa chake imatha kugwira ntchito bwino pagulu la 260Mhz.
- Mafupipafupi amayenera kusinthidwa kukhala ofanana pa transmitter ndi wolandila. Chifukwa, Mphamvu ya Amplifier ndi ma frequency antenna ayenera kusintha ma frequency omwewo. (Muyenera kugula chokulitsa mphamvu ndi mlongoti kuti chotumizira ndi cholandila chikwaniritse ma frequency omwe mwasintha).
- Pofuna kupititsa patsogolo kukhudzidwa kwa kutumiza ndi kulandira, pafupipafupi bandwidth nthawi zambiri imakhala yopapatiza kwambiri (pafupipafupi pakati ±15MHz, chifukwa chake bandwidth iyenera kukhala 30Mhz). Mphamvu ya amplifier ya transmitter ndi ma frequency a antenna amasinthidwa mwapadera malinga ndi kuchuluka komwe mukufuna..
- Ndikwabwino mukayitanitsa, chonde ndiuzeni mtundu wanthawi yogwira ntchito yomwe mukufuna. Mainjiniya athu asintha ma frequency a transmitter ndi wolandila, ndikusinthanso PA ndi mlongoti wachizolowezi molingana ndi ma frequency awa kuonetsetsa kukhudzika kwabwino kwambiri ndikuthandizira mtunda wautali kwambiri wotumizira.
- Ma frequency okhazikika ndi 590Mhz, Ndi 30Mhz (+/-15MHz), mutha kusintha popanda kusintha Power Amplifier ndi mlongoti. Mwachitsanzo, 578MHz, 584MHz, 590MHz, 596MHz, ndi 602mz.
- Ngati mukufuna kusintha ma frequency transmitter ndi bandwidth, muyenera chida chapadera cha parameter configure board, chonde onani chithunzi pansipa, sichowonjezera chokhazikika, chonde gulani pamtengo wowonjezera kapena tilankhule nafe musanayitanitse.
inde, imathandizira kutumiza kanema ndi data ya UART kuchokera kwa wotumiza ndi wolandila.
Monga kufala kwa njira imodzi, kotero sichingatumize lamulo lowongolera kuchokera kwa wolandila kupita ku transmitter.
Ngati mukufuna kutumiza malamulo owongolera kapena zidziwitso zina kuchokera kwa wolandila kuti muwongolere zida zina monga makamera kapena ma drones pa transmitter, mutha kuwonjezera zida zotsika mtengo zotumizira digito, Lumikizanani nafe, ndipo tikhoza kukukonzerani inu.
Chonde onani tanthauzo la UART pa transmitter ndi wolandila pa ulalo womwe uli pansipa. Chonde ndiuzeni ngati mukufuna kukhala ndi chingwe chotsogolera. (kusakhulupirika ndi ayi)
Chowonjezera cha Power Amplifier cha transmitter ndi 2 Watts, kotero ikhoza kuthandizira 30 KM pamzere wowonekera.
Chithunzi chili m'munsichi ndi mtunda wathu woyesedwa kuchokera kuphiri kupita kumphepete mwa nyanja.
Ngati mukufuna kufalitsa mtunda wautali, mukhoza kuwonjezera amplifier mphamvu. Kuphatikiza pa watt imodzi ndi ma watts awiri, tikhoza kupanga 5 Watts, 10 Watts, ndi 20 watts kusankha kwanu. Ma amplifiers akuluakulu amafunanso mabatire akuluakulu ndi chithandizo chamakono.
Pa 20W PA, magetsi ayenera kukhala 24 ~ 28V. Pokhapokha 28 volts amatha mphamvu amplifier kukwaniritsa ntchito yabwino.
Katswiri wathu amatha kusintha ma frequency kukhala 300Mhz kuchokera ku 590Mhz osakhazikika, Mlongoti, ndi PA m'nyumba yosungiramo katundu ndi 590Mhz, 300Mhz ikufunika milungu iwiri kuti isinthe, kotero nthawi yobweretsera ikufunika nthawi yayitali kuposa 590Mhz yathu.
Khwerero 1: Chonde dinani OK ndi batani lamanja nthawi yomweyo, mndandanda wazomwe mungasunge umawonekera pazenera.
Khwerero 2: Chonde dinani OK kuti musankhe Inde kuti musunge.
Kumbutsani, chonde gwiritsani ntchito mlongoti wamkulu kapena wautali ngati polojekiti yanu ikuloleza, ikhoza kupeza ntchito yabwino yolandirira m'magulu akuluakulu.
Seti yathunthu yokhazikika
- SD Transmitter ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W mwina malinga ndi zomwe mukufuna)
- SD Transmitter antenna
- HDMI CVBS yolandila yotulutsa yokhala ndi menyu yowongolera magawo ndi chophimba chaching'ono
- 0.8-mita Receiver mlongoti 1 ma PC. (Pali mitundu iwiri yoyika kapena kukonza mlongoti: 1. maginito sucker base antenna, 2. Pofikira Mlongoti wa U-mtundu wa FRP fiberglass antenna )
- unsankhula, gulu kasinthidwe gulu kwa opanda zingwe kanema transmitter.
(Ngati mukufuna mlongoti woyamwa maginito, wofotokozera kapena wonyamulira akuganiza kuti maginito angasokoneze chitetezo cha ndege, kotero mtengo wotumizira ndi wapamwamba kuposa mlongoti wa U-type clamp. )
Muyeso wa phukusi lathunthu lokhazikika
- 84*21*12CM
- Kulemera Kwambiri 4.5KG
- Ngati mungasankhe mlongoti wopitilira 100cm ndi mlongoti woyamwa maginito, Ena otumiza katundu amalipira ndalama zowonjezera, monga zolipiritsa zazitali zazitali komanso zolipiritsa zowonjezera pazinthu zamphamvu zamaginito.
- The transmitter parameter configure board ndi yosiyana ndi yomwe ili pa wolandila. Firmware pa board configure board inali yosiyana ndi transmitter ndi wolandila, sangagwiritsidwe ntchito mosiyana.
- The transmitter parameter configure board imatha kusintha kutsitsa kwa siginecha pa transmitter. Pa 0.3db idzachepetsa 0.5W PA.
funso: Kodi n'zotheka kusintha mphamvu yotuluka (mkati PA 0,5 yakumadzulo, 1 yakumadzulo, 2 yakumadzulo) kudzera pa configuration board?
- Monga yayankhidwa pamwambapa, mutha kusintha mphamvu yotulutsa pokhazikitsa magawo a ATTEN kudzera pa chida chosinthira chosinthira pachotumiza.. (Chida ichi sichiphatikiza phukusi lokhazikika, muyenera kudziwitsa kuti mukufuna kukhala ndi chida ichi mukayitanitsa)
- Mukagula 2W PA, ndiye mutha kuyiyika 0.5W, 1W, koma osasintha kukhala 5W.
- Tikhozanso kufika ku 5W, 10W, 20W, ndi 50W ngati mukufuna kuthandizira kutalika.
No.
Makanema opanda zingwewa amathandizira kokha kamera ya CVBS kapena kuyika makanema, mtundu wina wa kanema kamera amafuna owonjezera Converter bokosi.
No. Ndi COFDM (DVB-T) ukadaulo.
Chifukwa chake ma frequency a COFDM ndi 170-860Mhz. Ikhoza kuthandizira 477, 610, 675, 724, 816MHz, koma sindingathe kuthandizira 970, 1180, 1230 MHz.
Ma transmitter athu apadera amatha kuthandizira magawo onse pamwambapa, koma wolandila ayenera kugwiritsa ntchito chipika cha downconverter.
Pofuna kulola makina athu otumizira opanda zingwe kuti azithandizira kusiyanasiyana komanso kulimba kwa siginecha, nthawi zambiri timayika ma frequency ogwiritsira ntchito pamfundo inayake (170~ 860Mhz), ndipo mayendedwe ake othandizira amangowonjezera kapena kuchotsera 15Mhz. Mwachitsanzo, pafupipafupi pakati ndi 590Mhz, Thandizo lalikulu la pafupipafupi liyenera kukhala 575Mhz ~ 605Mhz, PA ndi mlongoti amasinthidwa mwapadera malinga ndi ma frequency apakati awa.
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.
