COFDM وائرليس وڊيو ٽرانسميٽر ۽ وصول ڪندڙ
مواد جو جدول
COFDM Wireless video transmitter and receiver Dimension
2-watt PA COFDM Wireless Video Transmitter
ڪرائون سائيز واري: 90x65x22mm
The most recent advancements in COFDM (ڪوڊ ٿيل آرٿوگونل فريڪوئنسي ڊويزن ملٽي پلڪسنگ) 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, وائرليس وڊيو ٽرانسميشن, ۽ ڊجيٽل ريڊيو. It’s also found in military and aerospace applications like satellite communications and unmanned aerial vehicles.
آخرڪار, 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 (رٿا) 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
سلام, 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.
ٺيڪ, 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 يا 128 لکت? the output format is full hd?
ها, COFDM-912T supports AES 128 لکت. 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 (جي). 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. تنهن ڪري, the signal transmitted wirelessly is easily interfered with. So here are the suggestions:
1. Try to use a high-power transmitter, جيئن ته 10 واٽس يا 20 وات. 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 antennaجي.
3. If conditions permit, هڪ ورجائيندڙ 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, ڪئميرا, and battery?
مهرباني ڪري هيٺ ڏنل تصوير چيڪ ڪريو. 
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 ڪيان, ساڄو?
With our 100 ڪيان, it’s about 300 جي طرف 400.
We also have one with 30 ڪيان, 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(30ڪلو ميٽر) 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?
ها, COFDM-912T supports transferring the serial data for you. مهرباني ڪري هيٺ ڏنل تصوير چيڪ ڪريو. 
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.
جواب: 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 ننڍن ننڍن – 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?
سلام! We did extensive testing before ordering a bigger batch. And faced issues if combining the COFDM-912T transmitter with GPS.
جواب:
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?”, جواب: 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. ساڳئي وقت ۾, 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, اسان سان رابطو ڪريو.
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
- ها, فریکوئنسي رينج 170Mhz کان تبديل ڪري سگھجي ٿو (ڀلي 220Mhz کان) 860Mhz تائين. تنهنڪري اهو 260Mhz بينڊ تي سٺو ڪم ڪري سگهي ٿو.
- تعدد کي تبديل ڪيو وڃي ساڳيءَ طرح ٽرانسميٽر ۽ رسيور تي. سبب جي, پاور ايمپليفائر ۽ اينٽينا جي تعدد کي ساڳئي تعدد کي تبديل ڪرڻ گهرجي. (توهان کي پنهنجي تبديل ٿيل تعدد کي پورا ڪرڻ لاءِ ٽرانسميٽر ۽ وصول ڪندڙ لاءِ پاور ايمپليفائر ۽ اينٽينا خريد ڪرڻ جي ضرورت آهي).
- منتقلي ۽ وصول ڪرڻ جي حساسيت کي بهتر ڪرڻ لاء, فریکوئنسي بينڊوڊٿ کي عام طور تي تمام تنگ ڪيو ويندو آهي (مرڪزي تعدد ±15Mhz, تنهنڪري بينڊوڊٿ 30Mhz هجڻ گهرجي). ٽرانسميٽر جي پاور ايمپليفائر ۽ اينٽينا جي فريکوئنسي خاص طور تي ترتيب ڏنل آهي توهان جي ضرورت مطابق فریکوئنسي جي مطابق.
- اهو بهترين آهي جڏهن توهان آرڊر ڏيو, مھرباني ڪري مون کي ٻڌايو ته توھان کي ڪھڙي قسم جي ڪم ڪندڙ تعدد جي ضرورت آھي. اسان جا انجنيئر ٽرانسميٽر ۽ وصول ڪندڙ جي تعدد کي تبديل ڪندا, ۽ پڻ PA ۽ ڪسٽم اينٽينا کي تبديل ڪريو ھن فريڪوئنسي رينج جي مطابق بهترين حساسيت کي يقيني بڻائڻ ۽ ڊگهي ٽرانسميشن جي فاصلي کي سپورٽ ڪرڻ.
- ڊفالٽ تعدد 590Mhz آهي, 30Mhz سان (+/-15Mhz), توھان ان کي تبديل ڪري سگھو ٿا بغير تبديل ڪرڻ جي پاور ايمپليفائر ۽ اينٽينا. مثال طور, 578Mhz, 584Mhz, 590Mhz, 596Mhz, ۽ 602Mhz.
- جيڪڏهن توهان کي ٽرانسميٽر جي تعدد ۽ بينڊوڊٿ کي تبديل ڪرڻ جي ضرورت آهي, توھان کي ضرورت آھي ھڪڙي خاص اوزار جي پيراميٽر ترتيب ڏيڻ واري بورڊ جو, مهرباني ڪري هيٺ ڏنل تصوير ڏسو, اهو هڪ ڊفالٽ لوازمات نه آهي, مهرباني ڪري ان کي خريد ڪريو هڪ اضافي قيمت تي يا اسان سان رابطو ڪريو آرڊر ڪرڻ کان پهريان.
ها, اهو وڊيو ۽ UART ڊيٽا موڪلڻ جي حمايت ڪري ٿو ٽرانسميٽر ۽ وصول ڪندڙ کان.
جيئن ته اهو هڪ طرفي ٽرانسميشن آهي, تنهن ڪري اهو ڪنٽرول ڪمانڊ وصول ڪندڙ کان ٽرانسميٽر ڏانهن موڪلي نٿو سگهي.
جيڪڏهن توهان کي ٻين ڊوائيسز جهڙوڪ ڪئميرا يا ڊرونز کي ٽرانسميٽر تي ڪنٽرول ڪرڻ لاء وصول ڪندڙ کان ڪنٽرول حڪم يا ٻيو ڊيٽا موڪلڻ جي ضرورت آهي., توهان سستو ڊجيٽل ٽرانسميشن سامان جو هڪ سيٽ شامل ڪري سگهو ٿا, اسان سان رابطو ڪريو, ۽ اسان ان کي توهان لاء ترتيب ڏئي سگهون ٿا.
مھرباني ڪري ھيٺ ڏنل لنڪ تي ٽرانسميٽر ۽ وصول ڪندڙ تي UART وضاحت ڪريو. مھرباني ڪري مون کي ٻڌايو ته جيڪڏھن توھان چاھيو ٿا ليڊ ڪيبل. (ڊفالٽ نمبر آهي)
ٽرانسميٽر ڊفالٽ پاور ايمپليفائر آهي 2 وات, تنهنڪري اهو سپورٽ ڪري سگهي ٿو 30 نظر ۾ KM.
هيٺ ڏنل تصوير جبل کان سامونڊي ڪناري تائين اسان جي آزمائشي فاصلي آهي.
جيڪڏهن توهان چاهيو ٿا ته هڪ ڊگهي حد تائين منتقل ڪريو, توهان پاور ايمپليفائر کي وڌائي سگهو ٿا. ان کان علاوه هڪ واٽ ۽ ٻه واٽ, اسان پڻ ڪري سگهون ٿا 5 watts, 10 watts, ۽ 20 توهان جي پسند لاء واٽ. وڏن ايمپليفائرز کي پڻ وڏي بيٽرين ۽ موجوده سپورٽ جي ضرورت آهي.
20W PA لاء, بجلي جي فراهمي 24 ~ 28V هجڻ گهرجي. صرف تي 28 وولٽ پاور ايمپليفائر کي بهترين ڪارڪردگي حاصل ڪري سگھن ٿا.
اسان جو انجنيئر ڊفالٽ 590Mhz کان 300Mhz تائين تعدد تبديل ڪري سگھي ٿو, اينٽينا, ۽ گودام ۾ PA 590Mhz آهن, 300Mhz کي ترتيب ڏيڻ لاءِ ٻن هفتن جي ضرورت آهي, تنهنڪري ترسيل وقت اسان جي ڊفالٽ 590Mhz کان وڌيڪ ضرورت آهي.
قدم 1: مھرباني ڪري پريس ڪريو OK ۽ سا buttonيو بٽڻ سا theئي وقت, ھڪڙو مينيو whetherا بچائڻ گھرجي اسڪرين تي.
قدم 2: مھرباني ڪري pressيڪ ڪريو د chooseائڻ لاءِ ھائو محفوظ ڪرڻ لاءِ.
ياد ڏياريندڙ, مھرباني ڪري وڏو يا ڊگھو اينٽيننا استعمال ڪريو جيڪڏھن توھان جو پروجيڪٽ اجازت ڏئي ٿو, اهو وڏي رينج ۾ بهتر استقبال ڪارڪردگي حاصل ڪري سگهي ٿو.
ڊفالٽ مڪمل سيٽ
- ايس ڊي ٽرانسميٽر ( PA 0.5W, 1اوله, 2اوله, 5اوله, 10اوله, 20اوله, 50W اختياري توهان جي حڪم جي گهرج مطابق)
- SD ٽرانسميٽر اينٽيننا
- HDMI CVBS آئوٽ پٽ رسيور پيٽرول ڪنٽرول مينيو ۽ ننڍي اسڪرين سان
- 0.8-ميٽر وصول ڪندڙ antenna 1 سيز. (اينٽينا کي انسٽال ڪرڻ يا درست ڪرڻ جا ٻه قسم آهن: 1. مقناطيسي sucker بنيادي antenna, 2. ھونئن يو-قسم clamp FRP فائبر گلاس antenna )
- اختياري, وائرليس وڊيو ٽرانسميٽر لاءِ پيراميٽر ترتيب ڏيڻ وارو بورڊ.
(جيڪڏهن توهان کي مقناطيسي چوسندڙ بنيادي اينٽيننا جي ضرورت آهي, ايڪسپريس يا ڪيريئر جو خيال آهي ته مقناطيسي پراڊڪٽس انهن جي جهاز جي حفاظت سان مداخلت ڪندا, تنهنڪري شپنگ جي قيمت يو-قسم ڪلپ اينٽنا کان وڌيڪ آهي. )
ڊفالٽ مڪمل سيٽ پيڪيج جو طول و عرض
- 84*21*12وزير اعلي
- مجموعي وزن 4.5 ڪلو
- جيڪڏهن توهان 100 سينٽي اينٽينا کان مٿي چونڊيو ۽ مقناطيسي چوسر بنيادي اينٽينا, ڪجھ مال بردار اڳتي وڌڻ وارا اضافي فيس چارج ڪندا, جيئن ته مضبوط مقناطيسي شين لاء اضافي ڊگهي فيس ۽ اضافي فيس.
- ٽرانسميٽر پيراميٽر ترتيب ڏيڻ وارو بورڊ وصول ڪندڙ کان مختلف آهي. پيراميٽر ترتيب ڏيڻ واري بورڊ تي فرم ویئر ٽرانسميٽر ۽ وصول ڪندڙ کان مختلف هو, اهي هڪ ٻئي جي بدلي ۾ استعمال نٿا ڪري سگهن.
- ٽرانسميٽر پيٽرول بورڊ ترتيب ڏئي سگھي ٿو ٽرانسميٽر تي سگنل جي گھٽتائي کي ترتيب ڏيو. في 0.3db گھٽ ڪندو 0.5W PA.
سوال: ڇا اهو ممڪن آهي ته آئوٽ پاور کي تبديل ڪرڻ (اندروني PA 0,5 اوله, 1 اوله, 2 اوله) ترتيب واري بورڊ جي ذريعي?
- جيئن مٿي جواب ڏنو ويو آهي, توهان ٽرانسميٽر تي پيراميٽر ڪنفيگريشن بورڊ ٽول ذريعي ATTEN جا پيرا ميٽر سيٽ ڪندي آئوٽ پٽ پاور کي ترتيب ڏئي سگهو ٿا. (ھن اوزار ۾ ڊفالٽ پيڪيج شامل نه آھي, توھان کي مطلع ڪرڻ جي ضرورت آھي ته توھان چاھيو ٿا ھي اوزار جڏھن توھان آرڊر ڪندا)
- جيڪڏهن توهان خريد ڪيو 2W PA, پوء توھان ان کي 0.5W سيٽ ڪري سگھو ٿا, 1اوله, پر ان کي 5W ۾ تبديل نٿو ڪري سگھجي.
- اسان ان کي 5W تائين پڻ ڪري سگھون ٿا, 10اوله, 20اوله, ۽ 50W جيڪڏهن توهان کي ڊگهي رينج جي حمايت ڪرڻ جي ضرورت آهي.
نه.
هي وائرليس وڊيو ٽرانسميٽر صرف سپورٽ ڪري ٿو CVBS ڪئميرا يا وڊيو ان پٽ, ٻئي قسم جي وڊيو ڪيمرا کي اضافي ڪنورٽر باڪس جي ضرورت آھي.
نه. اهو آهي COFDM (DVB-ٽي) ٽيڪنالاجي.
تنهن ڪري COFDM تعدد جي حد 170-860Mhz آهي. اهو سپورٽ ڪري سگهي ٿو 477, 610, 675, 724, 816Mhz, پر سپورٽ نٿو ڪري سگهي 970, 1180, 1230 Mhz.
اسان جو خاص ماڊل ٽرانسميٽر مٿين سڀني حدن کي سپورٽ ڪري سگھي ٿو, پر وصول ڪندڙ کي ھيٺ ڪنورٽر بلاڪ استعمال ڪرڻ جي ضرورت آھي.
اسان جي وائرليس ٽرانسميشن سسٽم کي اجازت ڏيڻ جي اجازت ڏيڻ لاء هڪ وسيع رينج ۽ بهتر سگنل جي طاقت کي سپورٽ ڪرڻ لاء, اسان عام طور تي آپريٽنگ فریکوئنسي کي هڪ خاص نقطي تي مقرر ڪيو آهي (170~860Mhz), ۽ ان جي سپورٽ رينج صرف پلس يا مائنس 15Mhz آهي. مثال طور, مرڪز جي تعدد 590Mhz آهي, وڌ ۾ وڌ سپورٽ فریکوئنسي رينج 575Mhz ~ 605Mhz هجڻ گهرجي, PA ۽ اينٽينا خاص طور تي هن مرڪز جي تعدد جي مطابق ترتيب ڏنل آهن.
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.
