EEant Technology CO., LTD is dedicated in the R&D, manufacturing, sale and promotion of RF Module - TX RX Module at 433Mhz and other frequency. Transmitter module and wireless RXB8 receiver module. 1. Microwave transmission
It is one of the solutions to solve the monitoring and transmission of difficult wiring places of several kilometers or even tens of kilometers. Using the method of frequency modulation modulation or amplitude modulation modulation, the image is mounted on a high-frequency carrier, converted into high-frequency electromagnetic waves, and transmitted in the air. Module RXB8 advantages are: low comprehensive cost, more stable performance, eliminating the need for wiring and cable maintenance costs; dynamic real-time transmission of broadcast-level images, good image transmission clarity, and complete real-time; flexible networking, good scalability, plug-in Ready to use; low maintenance. The disadvantage is: due to the use of microwave transmission, the frequency band is above 1GHz, and the commonly used L-band (1.0-2.0GHz), S-band (2.0-3.0GHz), Ku-band (10-12GHz), the transmission environment is an open space, If it is used in a big city, the radio waves are more complicated and are relatively susceptible to external electromagnetic interference; the microwave signal is transmitted in a straight line, and there should be no mountains or buildings in the middle; More serious, especially in rainy and snowy weather, there will be more serious rain attenuation. However, there are also digital microwave video receiver RXB8 products, which have improved anti-interference ability and scalability.
2. Twisted pair transmission
It is also a kind of video baseband transmission, which converts the 75Ω unbalanced mode into a balanced mode for transmission. It is a good solution to solve the problem of monitoring image transmission within 1Km, the electromagnetic environment is relatively complex, and the situation is better, and the monitoring image signal processing is transmitted in a balanced and symmetrical manner. Receiver RXB9 advantages are: simple wiring, low cost, strong anti-common mode dry worry performance. Its disadvantages are: it can only solve the transmission of monitoring images within 1Km, and a twisted pair can only transmit one image, which is not suitable for large and medium-sized monitoring; the twisted pair is fragile and has poor anti-aging ability, which is not suitable for field transmission; The high-frequency components remote module RXB9 transmitted by the twisted wire are attenuated greatly, and the color of the image will be greatly lost.
3. Video baseband transmission
It is the most traditional TV monitoring transmission method. It does not do any processing on the 0~6MHz video baseband signal, and directly transmits the analog signal through the receiver RXB10 coaxial cable (unbalanced). The advantages are: the short-distance transmission image signal loss is small, the cost is low, and the system is stable. Disadvantages: The transmission distance is short, the high frequency RF RXB10 components above 300 meters are attenuated greatly, and the image quality cannot be guaranteed; one cable needs to be laid for one video signal, and another cable is required for the transmission control signal; its structure is a star structure, which requires a large amount of wiring and maintenance. Difficult, poor scalability, suitable for small systems.
4. Optical fiber transmission
There are common analog optical transceivers and digital optical transceivers RXB11, which are the best solution for tens or even hundreds of kilometers of TV monitoring transmission. It converts video and control signals into laser signals and transmits them in optical fibers. Its advantages are: long transmission distance, small attenuation, good anti-interference performance, suitable for long-distance transmission. Module RXB11 disadvantages are: it is not economical for monitoring signal transmission within a few kilometers; optical fusion and maintenance require professional technicians and equipment operations, high maintenance technical requirements, and it is not easy to upgrade and expand.
Wireless RXB12 transmission technology Network transmission is a monitoring transmission method that solves the problem of long distance and extremely scattered points between metropolitan areas. It adopts MPEG2/4 and H.264 audio and video compression formats to transmit monitoring receiver RXB12 signals. Its advantages are: using a network video server as the monitoring signal uploading device, as long as there is an Internet network, the remote monitoring software can be installed to monitor and control. The disadvantage is: limited by the network bandwidth and speed, ADSL can only transmit small images and low-quality images; only a few to a dozen frames per second can be transmitted, and the animation effect is very obvious and delayed, so real-time cannot be achieved monitor.
5. Broadband common cable transmission
The video adopts technologies such as AM modulation, audio frequency modulation, and FSK data signal modulation RXB22, and integrates dozens of monitoring images, audio, control and alarm signals into "one" coaxial cable for bidirectional transmission. Its advantages are: make full use of the resource space of coaxial cables, 30 channels of audio, video and control signals are transmitted in two directions in the same cable to achieve "one-line communication"; simple construction, convenient maintenance, a lot of material cost and construction cost savings; frequency division The multiplexing technology solves the problem of scattered long-distance transmission points and difficult wiring to monitor and receiver RXB22; the radio frequency transmission method only attenuates the carrier signal, and the image signal attenuation is relatively small. The coaxial unbalanced transmission makes it have strong anti-interference ability, and the image quality can still be guaranteed in the complex electromagnetic environment. Its disadvantages are: weak signal transmission, high technical requirements for system debugging, professional instruments must be used, if there is a problem with one device in the trunk line, it may cause no image in the whole system, and the broadband modulation terminal needs to be supplied with AC220V AC power supply, but most monitoring All points have the condition of AC220V AC power supply.
6. Wireless SmartAir transmission
EEanttechnology is the only single-antenna mode wireless high-speed transmission technology in the communication industry. It adopts multi-band OFDM air interface technology, low-latency scheduling technology of TDMA, and advanced wireless ET-RX-13 receiver communication technologies such as low-density parity check code LDPC, adaptive modulation coding AMC and hybrid automatic retransmission HARQ to achieve a transmission rate of 1Gbps.