Tar-chuir bhidio gun uèir COFDM agus cuidhteas
Clàr-innse
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
meud: 90x65x22mm
The most recent advancements in COFDM (Ioma-fhillteachd roinn tricead orthogonal còd) 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, sgaoileadh bhidio gun uèir, agus rèidio didseatach. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Mu dheireadh, 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 Aon shlighe no dà-shlighe siostam? 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 no 128 crioptachadh? the output format is full hd?
Tha, COFDM-912T supports AES 128 crioptachadh. 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. Uime sin, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, mar eisimpleir 10 Watts or 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 ath-aithris 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, 'chamara, and battery?
Feuch an toir thu sùil air an dealbh gu h-ìosal. 
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, deas?
With our 100 milliseconds, it’s about 300 gu 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?
Tha, COFDM-912T supports transferring the serial data for you. Feuch an toir thu sùil air an dealbh gu h-ìosal. 
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.
freagairt: 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 meatair – 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.
freagairt:
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?”, freagairt: 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. Aig an aon àm, 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 NOT, 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, cuiribh fios thugainn.
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
Ceistean Cumanta
- Tha, faodar an raon tricead atharrachadh bho 170Mhz (nas fheàrr bho 220 Mhz) gu 860 MHz. Mar sin faodaidh e obrachadh gu math aig còmhlan 260Mhz.
- Bu chòir an tricead atharrachadh chun aon rud air an inneal-sgaoilidh agus an cuidhteas. As adhbhar, bu chòir don Power Amplifier agus tricead antenna an aon tricead atharrachadh. (Feumaidh tu amplifier cumhachd agus antenna a cheannach airson an inneal-sgaoilidh agus an cuidhteas gus coinneachadh ris an tricead atharraichte agad).
- Gus cugallachd tar-chuir agus faighinn a leasachadh, tha an leud-bann tricead mar as trice air a dhèanamh gu math cumhang (tricead ionad ±15Mhz, mar sin bu chòir leud-bann a bhith 30Mhz). Tha amplifier cumhachd an inneal-sgaoilidh agus tricead an antenna air an gnàthachadh gu sònraichte a rèir an tricead a dh ’fheumas tu.
- Tha e nas fheàrr nuair a chuireas tu òrdugh, feuch an innis thu dhomh dè an seòrsa tricead obrach a tha a dhìth ort. Atharraichidh na h-innleadairean againn tricead an inneal-sgaoilidh agus an cuidhteas, agus cuideachd atharraich am PA agus antenna àbhaisteach a rèir an raon tricead seo gus dèanamh cinnteach gu bheil an cugallachd as fheàrr agus taic a thoirt don astar tar-chuir as fhaide.
- Is e an tricead àbhaisteach 590Mhz, Le 30 Mhz (+/-15Mhz), faodaidh tu atharrachadh gun a bhith ag atharrachadh an Power Amplifier agus antenna. Mar eisimpleir, 578Mhz, 584Mhz, 590Mhz, 596Mhz, agus 602 Mhz.
- Ma dh’ fheumas tu tricead an inneal-sgaoilidh agus leud-bann atharrachadh, feumaidh tu inneal sònraichte den bhòrd rèiteachaidh paramadair, feuch an toir thu sùil air an dealbh gu h-ìosal, chan e accessory bunaiteach a th’ ann, feuch an ceannaich thu e aig cosgais a bharrachd no cuir fios thugainn mus cuir thu òrdugh.
Tha, tha e a 'toirt taic airson a' bhidio agus dàta UART a chuir bhon inneal-sgaoilidh agus an neach-glacaidh.
Leis gur e tar-chuir aon-shligheach a th’ ann, mar sin chan urrainn dha an àithne smachd a chuir bhon ghlacadair chun inneal-sgaoilidh.
Ma dh’ fheumas tu òrdughan smachd no dàta eile a chuir bhon ghlacadair gus smachd a chumail air innealan eile leithid camarathan no drones aig an inneal-sgaoilidh, faodaidh tu seata de uidheamachd tar-chuir didseatach saor a chuir ris, Cuir fios thugainn, agus is urrainn dhuinn a ghnàthachadh dhut.
Feuch an toir thu sùil air mìneachadh UART air an inneal-sgaoilidh agus an cuidhteas aig a’ cheangal gu h-ìosal. Feuch an innis thu dhomh ma tha thu airson càball luaidhe a bhith agad. (chan eil bunait sam bith)
Is e Power Amplifier àbhaisteach an inneal-sgaoilidh 2 Watts, gus an urrainn dha taic a thoirt 30 KM aig loidhne-seallaidh.
Is e an dealbh gu h-ìosal an astar deuchainn againn bhon bheinn gu tràigh na mara.
Ma tha thu airson raon nas fhaide a tharraing, faodaidh tu an amplifier cumhachd àrdachadh. A bharrachd air aon bhata agus dà watt, faodaidh sinn cuideachd a dhèanamh 5 uat, 10 uat, agus 20 watts airson do roghainn. Bidh feum aig amplifiers nas motha cuideachd air bataraidhean nas motha agus taic làithreach.
For 20W PA, the power supply should be 24~28V. Only at 28 volts can the power amplifier achieve the best workability.
Faodaidh an innleadair againn an tricead atharrachadh gu 300Mhz bhon 590Mhz àbhaisteach, An antenna, agus PA anns an taigh-bathair tha 590Mhz, 300Feumaidh Mhz dà sheachdain airson gnàthachadh, mar sin feumaidh an ùine lìbhrigidh nas fhaide na an 590Mhz àbhaisteach againn.
Ceum 1: Brùth air OK agus am putan ceart aig an aon àm, nochdaidh clàr air am bu chòir dhut sàbhaladh air an sgrion.
Ceum 2: Brùth air OK gus Tha a thaghadh airson sàbhaladh.
Cuimhnich, feuch an cleachd thu an antenna nas motha no nas fhaide ma cheadaicheas am pròiseact agad, faodaidh e coileanadh fàilteachaidh nas fheàrr fhaighinn anns an raon nas motha.
An seata slàn bunaiteach
- Inneal-sgaoilidh SD ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W roghainneil a rèir do òrdugh iarrtas)
- Antenna tar-chuir SD
- Glacadair toraidh HDMI CVBS le clàr smachd paramadair agus scrion bheag
- 0.8-antenna Glacadair meatair 1 PCan. (Tha dà sheòrsa de stàladh no càradh an antenna: 1. antenna bonn suidse magnetach, 2. Default Clamp seòrsa U antenna fiberglass FRP )
- Roghainneil, bòrd rèiteachaidh paramadair airson an inneal-sgaoilidh bhidio gun uèir.
(Ma tha feum agad air antenna bunait sucker magnetach, tha an luath no an neach-giùlain den bheachd gun cuir na toraidhean magnetach bacadh air sàbhailteachd itealain, mar sin tha a’ chosgais luingeis nas àirde na antenna clamp seòrsa U. )
Meud pacaid làn sheata bunaiteach
- 84*21*12CM
- Cuideam iomlan 4.5KG
- Ma thaghas tu còrr air 100cm antenna agus antenna bonn suidse magnetach, Cosgaidh cuid de luchd-tarsainn bathair cìsean a bharrachd, leithid cìsean fada a bharrachd agus cìsean a bharrachd airson stuthan làidir magnetach.
- Tha am bòrd rèiteachaidh paramadair tar-chuir eadar-dhealaichte bhon fhear air a’ ghlacadair. Bha am firmware air a’ bhòrd rèiteachaidh paramadair eadar-dhealaichte bhon inneal-sgaoilidh agus an cuidhteas, chan urrainn dhaibh a bhith air an cleachdadh gu h-eadar-mhalairteach.
- Faodaidh bòrd rèiteachadh paramadair an inneal-sgaoilidh atharrachadh a dhèanamh air lasachadh nan comharran air an inneal-sgaoilidh. Lùghdaichidh gach 0.3db an 0.5W PA.
Ceist: Is it possible to change the outpout power (internal PA 0,5 w, 1 w, 2 w) via the configuration board?
- As answered above, you can adjust the output power by setting the parameters of ATTEN through the parameter configuration board tool on the transmitter. (This tool does not include the default package, you need to notify that you want to have this tool when you order)
- If you buy 2W PA, then you can set it 0.5W, 1W, but can not change it to 5W.
- We also can make it to 5W, 10W, 20W, and 50W if you need to support long-range.
Chan eil.
Chan eil an inneal-sgaoilidh bhidio gun uèir seo a’ toirt taic ach do chamara CVBS no cuir a-steach bhidio, feumaidh seòrsa eile de chamara bhidio bogsa tionndaidh a bharrachd.
Chan eil. It is COFDM (DVB T-) teicneòlas.
So the COFDM frequency range is 170-860Mhz. It can support 477, 610, 675, 724, 816Mhz, but can not support 970, 1180, 1230 Mhz.
Our special model transmitter can support all the above ranges, but the receiver needs to use the downconverter block.
In order to allow our wireless transmitting system to support a wider range and better signal strength, we generally set the operating frequency to a certain point (170~860Mhz), and its supported range is only plus or minus 15Mhz. Mar eisimpleir, the center frequency is 590Mhz, max support frequency range should be 575Mhz~605Mhz, Tha am PA agus antenna air an gnàthachadh gu sònraichte a rèir tricead an ionaid seo.
Tha ceist agad fhathast?
Feuch an cuir thu fios thugainn airson tuilleadh fiosrachaidh.
Cuir do CheistHow 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.
