COFDM Wireless Video Transmitter kunye Receiver
Isiqulatho
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
Size: 90x65x22mm
The most recent advancements in COFDM (Ikhowudi ye-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, ukuhanjiswa kwevidiyo engenazingcingo, and radio receiver. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
Finally, 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
Mholo, I am looking for a long-range hd video transmitter with hdmi input and a receiver with hdmi output.
Would you like a indlela enye okanye indlela ezimbini inkqubo? 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.
Kulungile, 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 okanye 128 ufihlo? the output format is full hd?
Ewe, COFDM-912T supports AES 128 ufihlo. 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, I-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. ngoko ke, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, njenge 10 Watts okanye 20 IiWatts. 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, camera, and battery?
Nceda ujonge lo mfanekiso ungezantsi. 
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 millisecond, kunene?
With our 100 millisecond, it’s about 300 ukuba 400.
We also have one with 30 millisecond, 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?
Ewe, COFDM-912T supports transferring the serial data for you. Nceda ujonge lo mfanekiso ungezantsi. 
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.
Phendula: 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 imitha – 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?
Mholo! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
Phendula:
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?”, Phendula: max 0.6db
3. “Do you know what dBm loss is pass frequency?” 0.4eMfutshane DBM
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. Ngaxeshanye, 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, nceda uqhagamshelane nathi.
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
Ii-FAQs
- Ewe, uluhlu lwamafrikhwensi lunokutshintshwa ukusuka kwi-170Mhz (ngcono ukusuka kwi-220MHz) ukuba 860MHz. Ngoko inokusebenza kakuhle kwibhendi ye-260Mhz.
- I-frequency kufuneka iguqulwe ibe yinto efanayo kwi-transmitter kunye nomamkeli. Ngesizathu, i-Antenna Amplifier kunye nefrikhwensi ye-eriyali kufuneka iguqule i-frequency efanayo. (Kuya kufuneka uthenge i-amplifier yamandla kunye ne-eriyali ye-transmitter kunye ne-receiver ukuhlangabezana ne-frequency yakho etshintshileyo).
- Ukuze kuphuculwe ubuntununtunu bokuhambisa kunye nokwamkela, I-bandwidth yefrikhwensi yenziwa imxinwa kakhulu (frequency yeziko ±15MHz, ngoko ke i-bandwidth kufuneka ibe yi-30Mhz). I-amplifier yamandla ye-transmitter kunye ne-frequency ye-eriyali yenziwe ngokukhethekileyo ngokohlobo olufunayo..
- Kungcono xa ufaka iodolo, nceda undixelele ukuba loluphi uhlobo lwefrikhwensi yokusebenza oyifunayo. Iinjineli zethu ziya kuguqula ukuphindaphinda kwe-transmitter kunye nomamkeli, kwaye ulungise i-PA kunye ne-eriyali yesiko ngokwalo luhlu lwamaza ukuqinisekisa olona buntununtunu kunye nokuxhasa owona mgama mde wothumelo.
- I-frequency emiselweyo yi-590Mhz, Nge 30Mhz (+/-15MHz), Ungayitshintsha ngaphandle kokuguqula i-Amplifier yamandla kunye ne-eriyali. Umzekelo, 578MHz, 584MHz, 590MHz, 596MHz, kunye ne602MHz.
- Ukuba ufuna ukuguqula i-frequency transmitter kunye ne-bandwidth, udinga isixhobo esikhethekileyo sebhodi yoqwalaselo yeparameter, nceda ubone lo mfanekiso ungezantsi, ayisiyiyo i-accessory engagqibekanga, nceda uyithenge ngexabiso elongezelelweyo okanye uqhagamshelane nathi ngaphambi koku-odola.
Ewe, ixhasa ukuthumela ividiyo kunye nedatha ye-UART ukusuka kumthumeli kunye nomamkeli.
Njengoko kukudluliselwa kwendlela enye, ngoko ayikwazi ukuthumela umyalelo wolawulo ukusuka kumamkeli ukuya kwi-transmitter.
Ukuba ufuna ukuthumela imiyalelo yolawulo okanye enye idata evela kumamkeli ukulawula ezinye izixhobo ezinje ngeekhamera okanye iidrones kwi-transmitter, unokongeza iseti yezixhobo zothumelo lwedijithali ezitshiphu, Qhagamshelana nathi, kwaye sinokuyenzela wena.
Nceda ujonge i-UART ichaza kwi-transmitter kunye nomamkeli kwikhonkco elingezantsi. Nceda undixelele ukuba uyafuna ukuba nentambo yokukhokela. (ukungagqibeki ngunombolo)
Isidambisi saMandla esingagqibekanga sesidlulisi yi 2 IiWatts, ngoko inokuxhasa 30 KM kumgca-wokubona.
Lo mfanekiso ungezantsi ngumgama wethu ovavanyiweyo ukusuka entabeni ukuya ngaselwandle.
Ukuba ufuna ukuhambisa uluhlu olude, unokwandisa i-amplifier yamandla. Ukongeza kwi-watt enye kunye ne-watts ezimbini, singenza kwakhona 5 watt, 10 watt, kwaye 20 watts ukhetho lwakho. I-amplifiers ezinkulu nazo zifuna iibhetri ezinkulu kunye nenkxaso yangoku.
Kuba 20W PA, unikezelo lwamandla kufuneka lube yi-24 ~ 28V. Kuphela nge 28 I-volts inokwenza i-amplifier yamandla ifezekise ukusebenza kakuhle.
Injineli yethu inokutshintsha i-frequency ukuya kwi-300Mhz ukusuka kwi-590Mhz engagqibekanga, I-eriyali, kunye ne-PA kwindawo yokugcina impahla yi-590Mhz, 300Mhz idinga iiveki ezimbini ukwenza ngokwezifiso, ke ixesha lokuhambisa lifuna ixesha elide kune-590Mhz yethu engagqibekanga.
Inyathelo 1: Nceda ucofe u-OK kunye neqhosha lasekunene ngaxeshanye, Imenyu yokugcina iyavela kwiscreen.
Inyathelo 2: Nceda ucinezele Kulungile ukukhetha u-Ewe ukugcina.
Khumbuza, Nceda usebenzise i-eriyali enkulu okanye ende ukuba iprojekthi yakho iyakuvumela, inokufumana ukusebenza okungcono kolwamkelo kuluhlu olukhulu.
Iseti epheleleyo emiselweyo
- I-SD Transmitter ( PA 0.5W, 1W, 2W, 5W, 10W, 20W, 50W ngokuzikhethela ngokwemfuno yeodolo yakho)
- SD Transmitter eriyali
- I-HDMI CVBS imveliso ye-receiver kunye nemenyu yokulawula ipharamitha kunye nesikrini esincinci
- 0.8-imitha Umamkeli-eriyali 1 PC. (Kukho iintlobo ezimbini zokufakela okanye ukulungisa i-eriyali: 1. i-eriyali yokufunxa imagnethi, 2. Default U-uhlobo lokubamba i-eriyali ye-fiberglass ye-FRP )
- ozikhethela, ibhodi yoqwalaselo yepharamitha yothumelo lwevidiyo engenazingcingo.
(Ukuba ufuna i-eriyali esisiseko samagnetic, i-express okanye i-carrier icinga ukuba iimveliso zemagneti ziyakuphazamisa ukhuseleko lwabo lwenqwelomoya, ngoko iindleko zokuthumela ziphezulu kune-eriyali yokudibanisa i-U. )
Umyinge wepakethe emiselweyo epheleleyo
- 84*21*12I-CM
- Ubunzima obuGqibeleleyo 4.5KG
- Ukuba ukhetha ngaphaya kwe-100cm ye-eriyali kunye ne-eriyali yemagnethi yokufunxa, Abanye abathumeli bempahla baya kuhlawulisa imali eyongezelelweyo, njengemirhumo eyongezelelweyo emide kunye neentlawulo ezongezelelweyo zezinto ezinamandla zemagneti.
- I-transmitter parameter icwangcisa ibhodi yahlukile kuleyo ekumamkeli. I-firmware kwibhodi yokucwangcisa ipharamitha yayihluke kwi-transmitter kunye nomamkeli, azinakusetyenziswa ngokutshintshanayo.
- I-transmitter parameter icwangcisa ibhodi inokulungelelanisa ukuthotywa kwesignali kwi-transmitter. Nge-0.3db nganye iya kunciphisa i-0.5W PA.
umbuzo: Ngaba kunokwenzeka ukutshintsha amandla aphumayo (PA yangaphakathi 0,5 w, 1 w, 2 w) ngebhodi yoqwalaselo?
- Njengoko kuphendulwe ngasentla, Ungahlengahlengisa amandla emveliso ngokucwangcisa iparameters ze ATTEN ngokusebenzisa isixhobo sebhodi yoqwalaselo lweparameter kumthumeli.. (Esi sixhobo asibandakanyi umqulu omiselweyo, kufuneka wazise ukuba ufuna ukuba nesi sixhobo xa uodola)
- Ukuba uthenga i-2W PA, emva koko ungayiseta i-0.5W, 1W, kodwa awukwazi ukuyitshintsha ibe yi-5W.
- Singakwazi ukufikelela kwi-5W, 10W, 20W, kunye ne-50W ukuba ufuna ukuxhasa umgama omde.
Hayi.
Le video transmitter engenazingcingo ixhasa kuphela ikhamera yeCVBS okanye igalelo levidiyo, olunye uhlobo lwekhamera yevidiyo ludinga ibhokisi yokuguqula eyongezelelweyo.
Hayi. Yi-COFDM (DVB-T) ubuchwepheshe.
Ke uluhlu lwamaza e-COFDM yi-170-860Mhz. Inokuxhasa 477, 610, 675, 724, 816MHz, kodwa andinakuxhasa 970, 1180, 1230 MHz.
Umthumeli wethu okhethekileyo wemodeli unokuxhasa zonke ezi zintlu zingentla, kodwa umamkeli kufuneka asebenzise ibhloko ye-downconverter.
Ukuze sivumele inkqubo yethu yothumelo engenazingcingo ukuba ixhase uluhlu olubanzi kunye namandla ophawu olungcono, sibeka ngokubanzi i-frequency yokusebenza kwindawo ethile (170~860Mhz), kwaye uluhlu lwayo oluxhaswayo ludibanisa kuphela okanye thabatha 15Mhz. Umzekelo, i-frequency center yi-590Mhz, Uluhlu lwefrikhwensi yenkxaso ephezulu kufuneka ibe yi-575Mhz ~ 605Mhz, I-PA kunye ne-eriyali zilungiselelwe ngokukodwa ngokwale frikhwensi yeziko.
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.
