COFDM Wireless Video Transmitter lan Receiver
Daftar Isi
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Size: 90x65x22 mm
The most recent advancements in COFDM (Kode Divisi Frekuensi Ortogonal 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, transmisi video nirkabel, lan radio digital. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Akhire, 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
Woy, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.
Would you like a siji-arah utawa loro-lorone sistem? 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 utawa 128 enkripsi? the output format is full hd?
Ya, COFDM-912T supports AES 128 enkripsi. 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. Mulane, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, kayata 10 Watt utawa 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 repeater 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?
Mangga dipriksa ing ngisor iki Gambar. 
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, tengen?
With our 100 milliseconds, it’s about 300 kanggo 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?
Ya, COFDM-912T supports transferring the serial data for you. Mangga dipriksa ing ngisor iki Gambar. 
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.
jawaban: 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 meter – 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?
Woy! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
jawaban:
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?”, jawaban: 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. Ing wektu sing padha, 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, hubungi kita.
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
Pitakonan
- Ya, sawetara frekuensi bisa diganti saka 170Mhz (luwih saka 220Mhz) iki 860Mhz. Dadi bisa dianggo kanthi apik ing band 260Mhz.
- Frekuensi kudu diowahi dadi padha ing pemancar lan panrima. Saka sabab, Power Amplifier lan frekuensi antena kudu ngowahi frekuensi sing padha. (Sampeyan kudu tuku amplifier daya lan antena kanggo pemancar lan panrima kanggo ketemu frekuensi diganti).
- Kanggo nambah sensitivitas ngirim lan nampa, bandwidth frekuensi umume digawe banget sempit (frekuensi tengah ±15MHz, Dadi bandwidth kudu 30Mhz). Penguat daya pemancar lan frekuensi antena khusus disesuaikan miturut frekuensi sing dibutuhake.
- Iku paling apik nalika sampeyan nggawe pesenan, please ngomong apa jenis frekuensi apa sampeyan kudu. Insinyur kita bakal ngowahi frekuensi pemancar lan panrima, lan uga ngowahi PA lan antena adat miturut sawetara frekuensi iki kanggo njamin sensitivitas paling apik lan ndhukung jarak transmisi paling dawa.
- Frekuensi standar yaiku 590Mhz, Kanthi 30Mhz (+/-15MHz), sampeyan bisa ngganti tanpa ngowahi Power Amplifier lan antena. Tuladhane, 578MHz, 584MHz, 590MHz, 596MHz, lan 602mhz.
- Yen sampeyan kudu ngowahi frekuensi pemancar lan bandwidth, sampeyan butuh alat khusus saka papan konfigurasi parameter, mangga deleng gambar ing ngisor iki, iku ora aksesoris standar, mangga tuku kanthi biaya tambahan utawa hubungi kita sadurunge pesen.
Ya, ndhukung kanggo ngirim video lan data UART saka pemancar lan panrima.
Minangka transmisi siji-arah, supaya ora bisa ngirim printah kontrol saka panrima kanggo pemancar.
Yen sampeyan kudu ngirim perintah kontrol utawa data liyane saka panrima kanggo ngontrol piranti liyane kayata kamera utawa drone ing pemancar, sampeyan bisa nambah pesawat saka peralatan transmisi digital mirah, hubungi kita, lan kita bisa ngatur kanggo sampeyan.
Mangga dipriksa UART nemtokake ing pemancar lan panrima ing link ngisor. Mangga ngomong yen sampeyan pengin duwe kabel timbal. (standar ora)
Power Amplifier standar pemancar yaiku 2 Watts, supaya bisa ndhukung 30 KM ing line-of-sight.
Gambar ing ngisor iki minangka jarak sing dites saka gunung menyang pinggir segara.
Yen sampeyan pengin ngirim jarak sing luwih dawa, sampeyan bisa nambah power amplifier. Saliyane siji watt lan rong watt, kita uga bisa nggawe 5 watt, 10 watt, lan 20 watt kanggo pilihan sampeyan. Amplifier sing luwih gedhe uga mbutuhake baterei sing luwih gedhe lan dhukungan saiki.
Kanggo 20W PA, sumber daya kudu 24 ~ 28V. Mung ing 28 volt bisa amplifier daya entuk workability paling apik.
Insinyur kita bisa ngganti frekuensi dadi 300Mhz saka standar 590Mhz, Antena, lan PA ing gudhang punika 590Mhz, 300Mhz butuh rong minggu kanggo ngatur, supaya wektu pangiriman perlu luwih saka 590Mhz standar kita.
Langkah 1: Pencet OK banjur tombol nengen bebarengan, menu manawa nyimpen bakal ditampilake ing layar.
Langkah 2: Pencet OK kanggo milih Ya sing bakal disimpen.
Ngelingake, gunakake antena sing luwih gedhe utawa luwih dawa yen proyek sampeyan ngidini, bisa entuk kinerja resepsi sing luwih apik ing jangkoan sing luwih gedhe.
Set lengkap standar
- SD Transmitter ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W opsional miturut panjaluk pesenan sampeyan)
- SD Transmitter antena
- HDMI CVBS panrima output karo menu kontrol parameter lan layar cilik
- 0.8-antena panrima meter 1 pcs. (Ana rong jinis nginstal utawa ndandani antena: 1. antena basis sucker magnetik, 2. Default U-jinis clamp antena fiberglass FRP )
- pilihan, Papan konfigurasi parameter kanggo pemancar video nirkabel.
(Yen sampeyan butuh antena basis sucker magnetik, ekspres utawa operator mikir produk magnetik bakal ngganggu safety pesawat, dadi biaya pengiriman luwih dhuwur tinimbang antena clamp U-jinis. )
Ukuran paket set lengkap standar
- 84*21*12CM
- Bobot reged 4.5KG
- Yen sampeyan milih luwih saka 100cm antena lan Magnetik sucker basis antena, Sawetara pengiriman barang bakal ngisi biaya tambahan, kayata Fees ekstra dawa lan Fees ekstra kanggo item Magnetik kuwat.
- Parameter pemancar configures Papan beda saka siji ing panrima. Perangkat kukuh ing papan konfigurasi parameter beda karo pemancar lan panrima, padha ora bisa digunakake interchangeably.
- Parameter pemancar ngatur papan bisa nyetel atenuasi sinyal ing pemancar. Saben 0.3db bakal nyuda PA 0.5W.
Pitakonan: Apa bisa ngganti daya outpout (internal PA 0,5 w, 1 w, 2 w) liwat papan konfigurasi?
- Kaya mangsuli ing ndhuwur, sampeyan bisa nyetel daya output kanthi nyetel paramèter ATTEN liwat alat Papan konfigurasi parameter ing pemancar. (Alat iki ora kalebu paket standar, sampeyan kudu ngabari sing pengin duwe alat iki nalika sampeyan supaya)
- Yen sampeyan tuku 2W PA, banjur sampeyan bisa nyetel 0.5W, 1W, nanging ora bisa ngganti menyang 5W.
- Kita uga bisa nggawe nganti 5W, 10W, 20W, lan 50W yen sampeyan kudu ndhukung long-range.
Ora.
Pemancar video nirkabel iki mung ndhukung kamera CVBS utawa input video, jinis kamera video liyane mbutuhake kothak konverter ekstra.
Ora. Iku COFDM (DVB-T) teknologi.
Dadi sawetara frekuensi COFDM yaiku 170-860Mhz. Bisa ndhukung 477, 610, 675, 724, 816MHz, nanging ora bisa ndhukung 970, 1180, 1230 MHz.
Pemancar model khusus kita bisa ndhukung kabeh kisaran ing ndhuwur, nanging panrima kudu nggunakake pemblokiran downconverter.
Supaya sistem transmisi nirkabel bisa ndhukung jangkauan sing luwih akeh lan kekuatan sinyal sing luwih apik, kita umume nyetel frekuensi operasi kanggo titik tartamtu (170~860Mhz), lan sawetara sing didhukung mung plus utawa minus 15Mhz. Tuladhane, frekuensi tengah punika 590Mhz, kisaran frekuensi dhukungan maksimal kudu 575Mhz ~ 605Mhz, PA lan antena khusus disesuaikan miturut frekuensi tengah iki.
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.
