COFDM Haririk gabeko Bideo Transmisore eta Hargailua
Edukien taula
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Tamaina: 90x65x22mm
The most recent advancements in COFDM (Maiztasun-zatiketa ortogonalaren multiplexazioa kodetua) 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, haririk gabeko bideo transmisioa, eta irrati digitala. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Azkenik, 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 bide bakarra edo bi noranzkoak sisteman? 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.
ondo da, 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 edo 128 enkriptatzea? the output format is full hd?
Bai, COFDM-912T supports AES 128 enkriptatzea. 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. Hori dela, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, esaterako 10 Watt edo 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, a errepikagailua 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?
Mesedez, egiaztatu beheko irudia. 
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 milisegundotan, eskuineko?
With our 100 milisegundotan, it’s about 300 to 400.
We also have one with 30 milisegundotan, 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?
Bai, COFDM-912T supports transferring the serial data for you. Mesedez, egiaztatu beheko irudia. 
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.
Erantzuna: 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?
Hi! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
Erantzuna:
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?”, Erantzuna: 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. Momentu berean, 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, jarri gurekin harremanetan.
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
Ohiko galderak
- Bai, maiztasun-tartea 170Mhz-tik alda daiteke (hobeto 220 MHz-tik aurrera) 860 MHz-ra. Beraz, ondo funtziona dezake 260Mhz-ko bandan.
- Frekuentzia berdinera aldatu behar da igorlean eta hargailuan. Kausaz, Potentzia-anplifikadoreak eta antenaren maiztasunak maiztasun bera aldatu beharko lukete. (Potentzia-anplifikadorea eta antena erosi behar dituzu transmisorearentzat eta hargailuarentzat aldatutako maiztasuna asetzeko).
- Igortzeko eta jasotzeko sentikortasuna hobetzeko, maiztasun-banda zabalera, oro har, oso estua da (erdiko maiztasuna ±15Mhz, beraz, banda zabalera 30Mhz-koa izan behar da). Transmisorearen potentzia-anplifikadorea eta antenaren maiztasuna bereziki pertsonalizatuta daude behar duzun maiztasunaren arabera..
- Hobe da eskaera bat egiten duzunean, mesedez, esan iezadazu nolako lan-maiztasuna behar duzun. Gure ingeniariek transmisorearen eta hargailuaren maiztasuna aldatuko dute, eta PA eta antena pertsonalizatua ere aldatu maiztasun-tarte horren arabera sentsibilitate onena bermatzeko eta transmisio-distantzia luzeena onartzeko.
- Lehenetsitako maiztasuna 590Mhz-koa da, 30 MHz-ekin (+/-15Mhz), alda dezakezu potentzia-anplifikadorea eta antena aldatu gabe. Adibidez, 578Mhz, 584Mhz, 590Mhz, 596Mhz, eta 602 MHz.
- Igorlearen maiztasuna eta banda-zabalera aldatu behar badituzu, parametroen konfigurazio-taularen tresna berezi bat behar duzu, mesedez ikusi beheko irudia, ez da osagarri lehenetsia, mesedez erosi kostu gehigarrian edo jarri gurekin harremanetan eskaera egin aurretik.
Bai, bideoa eta UART datuak bidaltzea onartzen du igorletik eta hargailutik.
Norabide bakarreko transmisioa denez, beraz, ezin du kontrol komandoa hargailutik transmisorera bidali.
Hargailutik kontrol komandoak edo beste datu batzuk bidali behar badituzu, transmisorean beste gailu batzuk kontrolatzeko, adibidez, kamerak edo dronak., transmisio digitaleko ekipo merke multzo bat gehi dezakezu, jarri gurekin harremanetan, eta zuretzako pertsonaliza dezakegu.
Mesedez, egiaztatu UART definizioa igorlean eta hargailuan beheko estekan. Mesedez, esan iezadazu berunezko kable bat izan nahi duzun. (lehenetsia ez da)
Igorlearen potentzia-anplifikadore lehenetsia da 2 Watts, beraz, lagundu dezake 30 KM bista-lerroan.
Beheko irudia menditik itsasertzera probatutako distantzia da.
Ibilbide luzeagoa transmititu nahi baduzu, potentzia anplifikadorea handitu dezakezu. Watt bat eta bi watt gain, ere egin dezakegu 5 watt, 10 watt, eta 20 watt zure aukerarako. Anplifikadore handiagoek bateria handiagoak eta korronte euskarri handiagoak behar dituzte.
20W PArako, elikadura hornidura 24 ~ 28V izan behar du. Orduz bakarrik 28 volt-ek potentzia-anplifikagailuak lor dezake langarritasun onena.
Gure ingeniariak maiztasuna 300Mhz-ra alda dezake 590Mhz lehenetsitik, Antena, eta biltegian PA 590Mhz-koak dira, 300Mhz-ek bi aste behar ditu pertsonalizatzeko, beraz, entrega-denborak gure lehenetsitako 590Mhz baino luzeagoa behar du.
Urratsa 1: Sakatu OK eta eskuineko botoia aldi berean, gorde ala ez adierazten duen menua agertzen da pantailan.
Urratsa 2: Mesedez sakatu Ados Bai aukeratzeko gordetzeko.
Gogoratu, Mesedez, erabili antena handiagoa edo luzeagoa zure proiektuak ahalbidetzen badu, harrera-errendimendu hobea lor dezake sorta handiagoetan.
Multzo osoa lehenetsia
- SD transmisorea ( PA 0,5W, 1W, 2W, 5W, 10W, 20W, 50W aukerakoa zure eskaeraren arabera)
- SD transmisorearen antena
- HDMI CVBS irteera hargailua parametroen kontrol menuarekin eta pantaila txikiarekin
- 0.8-metroa Hargailuaren antena 1 pcs. (Antena instalatzeko edo finkatzeko bi mota daude: 1. zurrupagailu magnetikoaren oinarri antena, 2. Default U motako clamp FRP beira-zuntzezko antena )
- Aukerako, haririk gabeko bideo-igorlearen parametroen konfigurazio-taula.
(Oinarrizko antena magnetiko bat behar baduzu, express edo garraiolariek uste dute produktu magnetikoek beren hegazkinaren segurtasuna oztopatu egingo dutela, beraz, bidalketa kostua U motako clamp antena baino handiagoa da. )
Multzo osoko paketearen dimentsio lehenetsia
- 84*21*12CM
- Pisu gordina 4,5 kg
- 100 cm baino gehiagoko antena eta xurgagailu magnetikoko base antena aukeratzen badituzu, Merkantzien bidaltzaile batzuek gehigarriak kobratuko dituzte, hala nola, kuota luzeak eta elementu magnetiko indartsuentzako gehigarriak.
- Igorlearen parametroa konfiguratzen duen plaka hargailukoaren desberdina da. Parametroen konfigurazio taulako firmwarea igorlearen eta hargailuaren desberdina zen, ezin dira erabili elkarren artean.
- Transmisorearen parametroak konfiguratzen dituen taulak seinalearen atenuazioa doi dezake transmisorean. 0.3db bakoitzeko 0.5W PA murriztuko du.
Galdera: Posible al da irteera potentzia aldatzea (barne PA 0,5 w, 1 w, 2 w) konfigurazio-taularen bidez?
- Goian erantzun bezala, Irteerako potentzia doi dezakezu ATTEN-en parametroak igorgailuko parametroen konfigurazio-taularen tresnaren bidez ezarriz. (Tresna honek ez du lehenetsitako paketea sartzen, eskaera egiten duzunean tresna hau izan nahi duzula jakinarazi behar duzu)
- 2W PA erosten baduzu, orduan 0.5W ezar dezakezu, 1W, baina ezin da 5W-ra aldatu.
- 5W-ra ere egin dezakegu, 10W, 20W, eta 50W iraupen luzeko laguntza behar baduzu.
Ez.
Haririk gabeko bideo-igorgailu honek CVBS kamera edo bideo-sarrera soilik onartzen ditu, beste bideo-kamerak beste bihurgailu kaxa bat behar du.
Ez. COFDM da (DVB-T) teknologia.
Beraz, COFDM maiztasun-tartea 170-860Mhz-koa da. Onar dezake 477, 610, 675, 724, 816Mhz, baina ezin lagundu 970, 1180, 1230 Mhz.
Gure eredu bereziko transmisoreak goiko barruti guztiak onartzen ditu, baina hartzaileak downconverter blokea erabili behar du.
Gure haririk gabeko transmisio-sistemak sorta zabalagoa eta seinalearen indar hobea izan dezan, oro har, funtzionamendu-maiztasuna puntu jakin batean ezartzen dugu (170~ 860 MHz), eta onartzen duen barrutia 15Mhz-eko gehi edo ken baino ez da. Adibidez, erdiko maiztasuna 590Mhz-koa da, gehienezko laguntza-maiztasuna 575Mhz ~ 605Mhz izan behar du, PA eta antena bereziki pertsonalizatuta daude zentroko maiztasun horren arabera.
Oraindik galdera bat daukazu?
Mesedez, jar zaitez gurekin harremanetan informazio gehiago lortzeko.
Bidali zure galderaHow 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.
