Trosglwyddydd a Derbynnydd Fideo Di-wifr COFDM
Tabl Cynnwys
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
maint: 90x65x22mm
The most recent advancements in COFDM (Amlblecsu Is-adran Amlder Orthonglog â Chod) 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, trosglwyddo fideo di-wifr, a radio digidol. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Yn olaf, 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.
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.
iawn, 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 neu 128 amgryptio? the output format is full hd?
Ydw, COFDM-912T supports AES 128 amgryptio. 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. felly, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, fel 10 Watts neu 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 ailadroddwr 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?
Gwiriwch y llun isod. 
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 milieiliadau, hawl?
With our 100 milieiliadau, it’s about 300 i 400.
We also have one with 30 milieiliadau, 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?
Ydw, COFDM-912T supports transferring the serial data for you. Gwiriwch y llun isod. 
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.
ateb: 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 metr – 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.
ateb:
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?”, ateb: 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. Ar yr un pryd, 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, cysylltwch â ni.
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
Cwestiynau Cyffredin
- Ydw, gellir newid yr ystod amledd o 170Mhz (gwell o 220 Mhz) i 860Mhz. Felly gall weithio'n dda ar fand 260Mhz.
- Dylid addasu'r amledd i'r un peth ar y trosglwyddydd a'r derbynnydd. O achos, dylai'r Mwyhadur Pŵer ac amlder antena addasu'r un amledd. (Mae angen i chi brynu mwyhadur pŵer ac antena ar gyfer y trosglwyddydd a'r derbynnydd i gwrdd â'ch amledd newydd).
- Er mwyn gwella sensitifrwydd trosglwyddo a derbyn, mae'r lled band amlder yn cael ei wneud yn gul iawn yn gyffredinol (amlder canolfan ±15MHz, felly dylai lled band fod yn 30Mhz). Mae mwyhadur pŵer y trosglwyddydd ac amlder yr antena wedi'u haddasu'n arbennig yn ôl yr amlder sydd ei angen arnoch.
- Mae'n well pan fyddwch chi'n gosod archeb, dywedwch wrthyf pa fath o amlder gweithio sydd ei angen arnoch chi. Bydd ein peirianwyr yn addasu amlder y trosglwyddydd a'r derbynnydd, a hefyd addasu'r PA a'r antena arferol yn ôl yr ystod amledd hon i sicrhau'r sensitifrwydd gorau a chefnogi'r pellter trosglwyddo hiraf.
- Yr amledd rhagosodedig yw 590Mhz, Gyda 30Mhz (+/-15MHz), gallwch ei newid heb addasu'r Mwyhadur Pŵer a'r antena. Er enghraifft, 578MHz, 584MHz, 590MHz, 596MHz, a 602Mhz.
- Os oes angen i chi addasu amledd y trosglwyddydd a lled band, mae angen offeryn arbennig arnoch o'r bwrdd ffurfweddu paramedr, gwelwch y llun isod, nid yw'n affeithiwr diofyn, prynwch ef am gost ychwanegol neu cysylltwch â ni cyn archebu.
Ydw, mae'n cefnogi anfon y fideo a data UART o'r trosglwyddydd a'r derbynnydd.
Gan ei fod yn drosglwyddiad unffordd, felly ni all anfon y gorchymyn rheoli o'r derbynnydd i'r trosglwyddydd.
Os oes angen i chi anfon gorchmynion rheoli neu ddata arall o'r derbynnydd i reoli dyfeisiau eraill fel camerâu neu dronau yn y trosglwyddydd, gallwch ychwanegu set o offer trawsyrru digidol rhad, cysylltu â ni, a gallwn ei addasu ar eich cyfer chi.
Gwiriwch y diffiniad UART ar y trosglwyddydd a'r derbynnydd yn y ddolen isod. Dywedwch wrthyf os ydych am gael cebl plwm. (diofyn yw na)
Y Mwyhadur Pŵer rhagosodedig trosglwyddydd yw 2 Watts, felly gall gefnogi 30 KM ar linell y golwg.
Y llun isod yw ein pellter profedig o'r mynydd i lan y môr.
Os ydych chi am drosglwyddo ystod hirach, gallwch chi gynyddu'r mwyhadur pŵer. Yn ogystal ag un wat a dau wat, gallwn hefyd wneud 5 watt, 10 watt, ac 20 watiau ar gyfer eich dewis. Mae chwyddseinyddion mwy hefyd angen batris mwy a chefnogaeth gyfredol.
Ar gyfer 20W PA, dylai'r cyflenwad pŵer fod yn 24 ~ 28V. Dim ond yn 28 foltiau a all y mwyhadur pŵer gyflawni'r ymarferoldeb gorau.
Gall ein peiriannydd newid yr amledd i 300Mhz o'r 590Mhz rhagosodedig, Yr antena, a PA yn y warws yw 590Mhz, 300Mae angen pythefnos ar Mhz i addasu, felly mae angen mwy o amser ar yr amser dosbarthu na'n 590Mhz rhagosodedig.
Cam 1: Pwyswch OK a'r botwm iawn ar yr un pryd, mae dewislen p'un ai i arbed ai peidio yn ymddangos ar y sgrin.
Cam 2: Pwyswch OK i ddewis Ie i arbed.
Atgoffwch, defnyddiwch yr antena fwy neu hirach os yw eich prosiect yn caniatáu, gall gael gwell perfformiad derbyniad yn yr ystod fwy.
Y set lawn ddiofyn
- Trosglwyddydd SD ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W dewisol yn ôl eich galw archeb)
- Antena trosglwyddydd SD
- Derbynnydd allbwn HDMI CVBS gyda dewislen rheoli paramedr a sgrin fach
- 0.8-metr Derbynnydd antena 1 pcs. (Mae dau fath o osod neu osod yr antena: 1. antena sylfaen sugno magnetig, 2. Default Clamp math U antena gwydr ffibr FRP )
- dewisol, bwrdd cyfluniad paramedr ar gyfer y trosglwyddydd fideo di-wifr.
(Os oes angen antena sylfaen sugno magnetig arnoch chi, mae'r cyflym neu'r cludwr yn meddwl y bydd y cynhyrchion magnetig yn ymyrryd â'u diogelwch awyren, felly mae'r gost cludo yn uwch nag antena clamp math U. )
Y dimensiwn pecyn set lawn rhagosodedig
- 84*21*12CM
- Pwysau Crynswth 4.5KG
- Os dewiswch antena dros 100cm ac antena sylfaen sugno magnetig, Bydd rhai anfonwyr cludo nwyddau yn codi ffioedd ychwanegol, megis ffioedd hir ychwanegol a ffioedd ychwanegol ar gyfer eitemau magnetig cryf.
- Mae bwrdd ffurfweddu paramedr y trosglwyddydd yn wahanol i'r un ar y derbynnydd. Roedd y firmware ar y bwrdd ffurfweddu paramedr yn wahanol i'r trosglwyddydd a'r derbynnydd, ni ellir eu defnyddio yn gyfnewidiol.
- Gall bwrdd ffurfweddu paramedr y trosglwyddydd addasu'r gwanhad signal ar y trosglwyddydd. Bydd fesul 0.3db yn lleihau'r PA 0.5W.
cwestiwn: A yw'n bosibl newid y pŵer allbynnu (PA mewnol 0,5 w, 1 w, 2 w) trwy'r bwrdd ffurfweddu?
- Fel yr atebwyd uchod, gallwch chi addasu'r pŵer allbwn trwy osod paramedrau ATTEN trwy'r offeryn bwrdd cyfluniad paramedr ar y trosglwyddydd. (Nid yw'r offeryn hwn yn cynnwys y pecyn rhagosodedig, mae angen i chi hysbysu eich bod am gael yr offeryn hwn pan fyddwch yn archebu)
- Os ydych chi'n prynu 2W PA, yna gallwch chi ei osod yn 0.5W, 1W, ond ni all ei newid i 5W.
- Gallwn hefyd gyrraedd 5W, 10W, 20W, a 50W os oes angen i chi gefnogi ystod hir.
Nac oes.
Mae'r trosglwyddydd fideo diwifr hwn yn cefnogi mewnbwn camera neu fideo CVBS yn unig, mae angen blwch trawsnewidydd ychwanegol ar fath arall o gamera fideo.
Nac oes. Mae'n COFDM (DVB-T) technoleg.
Felly ystod amledd COFDM yw 170-860Mhz. Gall gefnogi 477, 610, 675, 724, 816MHz, ond ni all gefnogi 970, 1180, 1230 MHz.
Gall ein trosglwyddydd model arbennig gefnogi'r holl ystodau uchod, ond mae angen i'r derbynnydd ddefnyddio'r bloc trawsnewidydd i lawr.
Er mwyn caniatáu i'n system trawsyrru diwifr gefnogi ystod ehangach a chryfder signal gwell, yn gyffredinol rydym yn gosod yr amlder gweithredu i bwynt penodol (170~860Mhz), a dim ond plws neu finws 15Mhz yw ei ystod a gefnogir. Er enghraifft, amlder y ganolfan yw 590Mhz, dylai'r ystod amledd cymorth uchaf fod yn 575Mhz ~ 605Mhz, Mae'r PA a'r antena wedi'u haddasu'n arbennig yn ôl amlder y ganolfan hon.
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.
