COFDM Wireless Videyo Transmetè ak Reseptè
Table of Contents
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Kantite moun ki: 90x65x22mm
The most recent advancements in COFDM (Kode Orthogonal Frekans Divizyon 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, transmisyon videyo san fil, ak radyo dijital. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
finalman, 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.
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 oswa 128 chifreman? the output format is full hd?
Wi, COFDM-912T supports AES 128 chifreman. 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 (an). 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. Se poutèt sa, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, tankou 10 Watts oswa 20 Wat. 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 antennanan.
3. If conditions permit, yon repete 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?
Tanpri tcheke foto ki anba a. 
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 milisgond, dwat?
With our 100 milisgond, it’s about 300 a 400.
We also have one with 30 milisgond, 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?
Wi, COFDM-912T supports transferring the serial data for you. Tanpri tcheke foto ki anba a. 
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.
repons: 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 mèt – 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.
repons:
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?”, repons: 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. An menm tan, 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, tanpri kontakte nou.
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
FAQ
- Wi, ka ranje frekans lan dwe chanje soti nan 170Mhz (pi bon soti nan 220Mhz) a 860Mhz. Se konsa, li ka travay byen nan bann 260Mhz.
- Frekans lan ta dwe modifye pou menm bagay la tou sou transmetè a ak reseptè a. De kòz, Anplifikatè pouvwa a ak frekans antèn yo ta dwe modifye menm frekans lan. (Ou bezwen achte yon anplifikatè pouvwa ak antèn pou transmetè a ak reseptè pou satisfè frekans ou chanje).
- Yo nan lòd yo amelyore sansiblite nan transmèt ak resevwa, se Pleasant a frekans jeneralman fè trè etwat (frekans sant lan ±15megaèrts, Se konsa, bandwidth ta dwe 30Mhz). Anplifikatè pouvwa a nan transmetè a ak frekans nan antèn la yo espesyalman Customized dapre frekans ou bezwen an..
- Li pi bon lè ou mete yon lòd, tanpri di m 'ki kalite frekans travay ou bezwen. Enjenyè nou yo pral modifye frekans transmetè a ak reseptè a, epi tou modifye PA ak koutim antèn selon ranje frekans sa a asire pi bon sansiblite ak sipòte distans transmisyon ki pi long.
- Frekans default la se 590Mhz, Avèk 30Mhz (+/-15megaèrts), ou ka chanje li san yo pa modifye anplifikatè pouvwa a ak antèn. Pa egzanp, 578megaèrts, 584megaèrts, 590megaèrts, 596megaèrts, ak 602Mhz.
- Si ou bezwen modifye frekans transmetè a ak Pleasant, ou bezwen yon zouti espesyal nan paramèt konfigirasyon tablo a, tanpri gade foto ki anba a, li se pa yon akseswar default, tanpri achte li nan yon pri siplemantè oswa kontakte nou anvan kòmande.
Wi, li sipòte voye videyo a ak done UART soti nan transmetè a ak reseptè a.
Kòm li se transmisyon yon sèl-fason, kidonk li pa ka voye lòd kontwòl la soti nan reseptè a transmetè a.
Si ou bezwen voye kòmandman kontwòl oswa lòt done ki soti nan reseptè a pou kontwole lòt aparèy tankou kamera oswa dron nan transmetè a, ou ka ajoute yon seri bon mache ekipman transmisyon dijital, Kontakte nou, epi nou ka Customize li pou ou.
Tanpri tcheke UART defini sou transmetè a ak reseptè a nan lyen ki anba a. Tanpri di m si ou vle gen yon kab plon. (default se non)
Anplifikatè pouvwa transmetè default la se 2 Wat, konsa li ka sipòte 30 KM nan liy-of-sight.
Foto ki anba a se distans nou teste ant mòn lan ak lanmè a.
Si ou vle transmèt yon seri pi long, ou ka ogmante anplifikatè pouvwa a. Anplis de yon watt ak de watt, nou ka fè tou 5 Watts, 10 Watts, ak 20 Watts pou chwa ou. Pi gwo anplifikatè tou mande pou pi gwo pil ak sipò aktyèl.
Pou 20W PA, ekipman pou pouvwa a ta dwe 24 ~ 28V. Se sèlman nan 28 volts ka anplifikatè pouvwa a reyalize pi bon travayabilite.
Enjenyè nou an ka chanje frekans nan 300Mhz soti nan default 590Mhz, Antèn la, ak PA nan depo a se 590Mhz, 300Mhz bezwen de semèn pou personnaliser, Se konsa, tan an livrezon bezwen pi long pase 590Mhz default nou an.
Etap 1: Tanpri peze OK ak bouton an dwa an menm tan an, yon meni si wi ou non pou konsève pou parèt sou ekran an.
Etap 2: Tanpri peze OK yo chwazi Wi pou konsève pou.
Raple, tanpri itilize antèn ki pi gwo oswa pi long si pwojè ou a pèmèt, li ka jwenn pi bon pèfòmans resepsyon nan seri a pi gwo.
Defo konplè seri a
- SD transmetè ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W opsyonèl dapre demann lòd ou a)
- SD antèn transmetè
- HDMI CVBS reseptè pwodiksyon ak meni kontwòl paramèt ak ti ekran
- 0.8-mèt Reseptè antèn 1 KONPITÈ DEZYÈM MEN. (Gen de kalite enstale oswa fikse antèn la: 1. mayetik antèn baz vantouz, 2. default U-type kranpon FRP vèr antèn )
- Si ou vle, paramèt konfigirasyon tablo pou transmetè videyo san fil.
(Si ou bezwen yon baz antèn mayetik, eksprime oswa konpayi asirans lan panse pwodwi mayetik yo pral entèfere ak sekirite avyon yo, Se konsa, pri a anbake pi wo pase yon antèn U-type kranpon. )
Dimansyon pakè a defo konplè
- 84*21*12CM
- Pwa brit 4.5KG
- Si w chwazi plis pase 100cm antèn ak mayetik antèn baz ventouse, Gen kèk transitaire k ap chaje frè siplemantè, tankou frè siplemantè long ak frè siplemantè pou atik fò mayetik.
- Paramèt transmetè a konfigirasyon tablo se diferan de youn nan reseptè a. Firmware a sou tablo a konfigirasyon paramèt te diferan de transmetè a ak reseptè a, yo pa ka itilize interchangeable.
- Paramèt transmetè a konfigirasyon tablo ka ajiste atenuasyon siyal la sou transmetè a. Pou chak 0.3db ap diminye 0.5W PA a.
kesyon: Èske li posib pou chanje pouvwa outoutout la (entèn PA 0,5 w, 1 w, 2 w) atravè tablo konfigirasyon an?
- Jan reponn pi wo a, ou ka ajiste pouvwa a pwodiksyon pa mete paramèt yo nan ATTEN atravè zouti nan tablo konfigirasyon paramèt sou transmetè a. (Zouti sa a pa gen ladan pakè default la, ou bezwen notifye ke ou vle gen zouti sa a lè ou kòmande)
- Si ou achte 2W PA, Lè sa a, ou ka mete li 0.5W, 1W, men li pa ka chanje li nan 5W.
- Nou menm tou nou ka fè li nan 5W, 10W, 20W, ak 50W si ou bezwen sipòte alontèm.
Pa gen.
Transmetè videyo san fil sa a sèlman sipòte kamera CVBS oswa opinyon videyo, lòt kalite kamera videyo bezwen yon bwat konvètisè siplemantè.
Pa gen. Li se COFDM (DVB-T) teknoloji.
Se konsa, ranje frekans COFDM se 170-860Mhz. Li ka sipòte 477, 610, 675, 724, 816megaèrts, men li pa ka sipòte 970, 1180, 1230 megaèrts.
Transmetè modèl espesyal nou an ka sipòte tout chenn ki anwo yo, men reseptè a bezwen sèvi ak blòk la downconverter.
Yo nan lòd yo pèmèt sistèm transmisyon san fil nou an sipòte yon seri pi laj ak pi bon fòs siyal, nou jeneralman mete frekans nan fonksyone nan yon sèten pwen (170~ 860Mhz), ak ranje sipòte li yo se sèlman plis oswa mwens 15Mhz. Pa egzanp, frekans sant lan se 590Mhz, ranje frekans sipò max yo ta dwe 575Mhz ~ 605Mhz, PA a ak antèn yo espesyalman Customized dapre frekans sant sa a.
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.
