COFDM mea hoʻolele wikiō uila a me ka mea loaʻa
Papa helu
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Size: 90x65x22mm
The most recent advancements in COFDM (Hoʻohui ʻia ʻo 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, hoʻouna wikiō ʻole, a me ka kikohoʻe Radio. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
ʻO ka hope loa, 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
Hui, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.
Would you like a hoʻokahi ala ole ʻaoʻao ʻelua 'ōnaehana? 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.
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 ole 128 hoʻopunipuni? the output format is full hd?
ʻAe, COFDM-912T supports AES 128 hoʻopunipuni. 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. No ia mea,, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, e like me 10 Watts a i ʻole 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 antennamau.
3. If conditions permit, he mea hana hou 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, pahupaʻiwikiō, and battery?
E ʻoluʻolu e nānā i ke kiʻi ma lalo. 
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, akau?
With our 100 milliseconds, it’s about 300 i ka 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(30ei) 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?
ʻAe, COFDM-912T supports transferring the serial data for you. E ʻoluʻolu e nānā i ke kiʻi ma lalo. 
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.
pane: 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 mika – 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?
Hui! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
pane:
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?”, pane: 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 ka manawa like, 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, ʻoluʻolu e leka uila mai.
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
- ʻAe, hiki ke hoʻololi i ke alapine mai 170Mhz (maikaʻi aʻe mai 220Mhz) i 860Mhz. No laila hiki ke hana maikaʻi ma 260Mhz band.
- Pono e hoʻololi ʻia ka alapine e like me ka mea hoʻouna a me ka mea hoʻokipa. No ke kumu, pono e hoʻololi ka Power Amplifier a me ke alapine antenna i ka alapine like. (Pono ʻoe e kūʻai i ka mana amplifier a me ka antenna no ka transmitter a me ka mea hoʻokipa e hālāwai me kāu alapine i hoʻololi ʻia).
- I mea e hoʻomaikaʻi ai i ka naʻau o ka hoʻouna ʻana a me ka loaʻa ʻana, ʻO ka bandwidth alapine e hana haiki loa (alapine waena ±15MHz, no laila he 30Mhz ka bandwidth). Hoʻonohonoho kūikawā ʻia ka mana amplifier o ka transmitter a me ke alapine o ka antenna e like me ke alapine āu e pono ai..
- ʻOi aku ka maikaʻi ke kau ʻoe i kahi kauoha, e ʻoluʻolu e haʻi mai iaʻu i ke ʻano o ka pinepine hana āu e pono ai. E hoʻololi ko mākou mau ʻenekini i ke alapine o ka transmitter a me ka mea hoʻokipa, a hoʻololi pū i ka PA a me ka antenna maʻamau e like me kēia ʻano alapine e hōʻoia i ka naʻau maikaʻi loa a kākoʻo i ka mamao hoʻouna lōʻihi loa.
- ʻO 590Mhz ka alapine paʻamau, Me 30Mhz (+/-15MHz), hiki iā ʻoe ke hoʻololi me ka hoʻololi ʻole i ka Power Amplifier a me ka antenna. ʻo kahi laʻana, 578MHz, 584MHz, 590MHz, 596MHz, a me 602Mhz.
- Inā pono ʻoe e hoʻololi i ka alapine transmitter a me ka bandwidth, pono ʻoe i kahi mea hana kūikawā o ka papa hoʻonohonoho parameter, e ʻoluʻolu e ʻike i ke kiʻi ma lalo nei, ʻaʻole ia he mea hoʻohana paʻamau, e ʻoluʻolu e kūʻai mai ma ke kumu kūʻai keu a e kelepona mai iā mākou ma mua o ke kauoha ʻana.
ʻAe, kākoʻo ia e hoʻouna i ka ʻikepili wikiō a me ka UART mai ka mea lawe a me ka mea lawe.
E like me ka hoʻoili ʻana hoʻokahi ala, no laila ʻaʻole hiki iā ia ke hoʻouna i ke kauoha hoʻomalu mai ka mea hoʻokipa i ka transmitter.
Inā pono ʻoe e hoʻouna i nā kauoha mana a i ʻole nā ʻikepili ʻē aʻe mai ka mea hoʻokipa e hoʻomalu i nā mea hana ʻē aʻe e like me nā kamera a i ʻole nā drones ma ka transmitter, hiki iā ʻoe ke hoʻohui i kahi pūʻulu o nā lako hoʻoili kikohoʻe haʻahaʻa, kāhea iā mā˚ou, a hiki iā mākou ke hana iā ʻoe.
E ʻoluʻolu e nānā i ka wehewehe UART ma ka mea hoʻouna a me ka mea hoʻokipa ma ka loulou ma lalo nei. E ʻoluʻolu e haʻi mai iaʻu inā makemake ʻoe e loaʻa i kahi kaula alakaʻi. (ʻAʻole)
ʻO ka mea hoʻopuka paʻamau Power Amplifier ʻo ia 2 Watts, no laila hiki ke kākoʻo 30 KM ma ka laina ʻike.
ʻO ke kiʻi ma lalo nei ko mākou mamao i hoʻāʻo ʻia mai ke kuahiwi a hiki i kahakai.
Inā makemake ʻoe e hoʻouna i kahi lōʻihi lōʻihi, hiki iā ʻoe ke hoʻonui i ka mana amplifier. Ma waho aʻe o hoʻokahi watt a me ʻelua watts, hiki iā mākou ke hana 5 watts, 10 watts, a 20 watts no kāu koho. ʻO nā mea hoʻonui nui aʻe e koi aku i nā pākaukau nui a me ke kākoʻo o kēia manawa.
No 20W PA, ka mana lako pono e 24 ~ 28V. Aia wale ma 28 Hiki i nā volts ke hoʻokō i ka mana hana maikaʻi loa.
Hiki i kā mākou ʻenekini ke hoʻololi i ke alapine i 300Mhz mai ka 590Mhz paʻamau, ʻO ka antena, a ʻo PA i loko o ka hale kūʻai he 590Mhz, 300Pono ʻo Mhz i ʻelua pule e hana ai, no laila ʻoi aku ka lōʻihi o ka manawa hāʻawi ma mua o kā mākou 590Mhz paʻamau.
ʻanuʻu 1: E ʻoluʻolu e kaomi iā OK a me ke pihi ʻākau i ka manawa like, kahi papa kuhikuhi no ka mālama ʻana paha ma ka papakaumaka.
ʻanuʻu 2: E ʻoluʻolu e kaomi iā OK e koho iā ʻAe e mālama.
Hoʻomanaʻo, E ʻoluʻolu e hoʻohana i ka antenna nui a lōʻihi paha inā ʻae kāu papahana, hiki ke loaʻa i ka hana hoʻokipa ʻoi aku ka maikaʻi ma ka laulā nui.
ʻO ka hoʻonohonoho piha paʻamau
- Ka mea lawe SD ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W koho e like me kou kauoha kauoha)
- SD Transmitter antenna
- ʻO ka mea hoʻokipa hoʻopuka HDMI CVBS me ka papa kuhikuhi mana a me ka pale liʻiliʻi
- 0.8-mika Mea hoʻokipa antenna 1 pcs. (ʻElua ʻano o ka hoʻokomo ʻana a i ʻole ka hoʻoponopono ʻana i ka antenna: 1. antenna kumu sucker magnetic, 2. Default U-type clamp FRP fiberglass antenna )
- pono, papa hoʻonohonoho hoʻohālikelike no ka mea hoʻolele wikiō uea.
(Inā makemake ʻoe i kahi antenna kumu sucker magnetic, Manaʻo ka mea hōʻike a mea lawe paha e hoʻopilikia nā huahana magnetic i ko lākou palekana mokulele, no laila ʻoi aku ka kiʻekiʻe o ke kumukūʻai hoʻouna ma mua o kahi antenna clamp U-type. )
ʻO ka nui o ka pūʻolo hoʻonohonoho piha
- 84*21*12knm
- Kaumaha Nui 4.5KG
- Inā koho ʻoe ma luna o 100cm antenna a me magnetic sucker base antenna, E uku kekahi mau mea lawe ukana i nā uku keu, e like me nā uku lōʻihi a me nā uku hou no nā mea magnetic ikaika.
- ʻOkoʻa ka papa hoʻonohonoho transmitter me ka mea ma ka mea hoʻokipa. ʻOkoʻa ka firmware ma ka papa hoʻonohonoho hoʻonohonoho ʻokoʻa mai ka transmitter a me ka mea hoʻokipa, ʻaʻole hiki ke hoʻohana like ʻia.
- Hiki ke hoʻololi i ka hoʻololi ʻana o ka hōʻailona ma ka transmitter. Ma ka 0.3db e ho'ēmi i ka 0.5W PA.
ninau: Hiki ke hoʻololi i ka mana outpout (kūloko PA 0,5 W, 1 W, 2 W) ma o ka papa hoʻonohonoho?
- E like me ka pane ʻana ma luna, hiki iā ʻoe ke hoʻololi i ka mana hoʻopuka ma ka hoʻonohonoho ʻana i nā ʻāpana o ATTEN ma o ka mea hana papa hoʻonohonoho hoʻonohonoho ma ka transmitter. (ʻAʻole hoʻokomo kēia mea hana i ka pūʻolo paʻamau, pono ʻoe e hoʻomaopopo e makemake ʻoe e loaʻa kēia mea hana ke kauoha ʻoe)
- Inā kūʻai ʻoe i 2W PA, a laila hiki iā ʻoe ke hoʻonohonoho iā 0.5W, 1W, akā ʻaʻole hiki ke hoʻololi iā 5W.
- Hiki iā mākou ke hana i ka 5W, 10W, 20W, a me 50W inā pono ʻoe e kākoʻo i ka lōʻihi.
ʻAʻole.
Ke kākoʻo wale nei kēia mea hoʻouna wikiō ʻoniʻoni ʻoniʻoni CVBS a i ʻole ka hoʻokomo wikiō, pono ke ʻano pahu pahu hoʻololi ʻē aʻe.
ʻAʻole. ʻO COFDM (DVB-T) enehana.
No laila, ʻo ka laina alapine COFDM he 170-860Mhz. Hiki ke kākoʻo 477, 610, 675, 724, 816MHz, akā ʻaʻole hiki ke kākoʻo 970, 1180, 1230 MHz.
Hiki i kā mākou mea hoʻolaha hoʻohālike kūikawā ke kākoʻo i nā pae āpau i luna, akā pono ka mea hoʻokipa e hoʻohana i ka poloka downconverter.
I mea e hiki ai i kā mākou ʻōnaehana hoʻoili uila ke kākoʻo i kahi ākea ākea a ʻoi aku ka ikaika o ka hōʻailona, Hoʻonohonoho mākou i ka alapine hana i kekahi wahi (170~860Mhz), a ʻo kona laulā kākoʻo he hoʻohui a i ʻole he 15Mhz wale nō. ʻo kahi laʻana, ʻo ka alapine waena he 590Mhz, ʻO 575Mhz~605Mhz ka laulā kākoʻo nui, Hoʻonohonoho kūikawā ʻia ka PA a me ka antenna e like me kēia alapine waena.
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.
