COFDM டிரான்ஸ்ஸீவர்
பொருளடக்கம்
What is the COFDM Transceiver?
COFDM Transceiver is a pair of devices that can get and send out data and video. COFDM transmitter and receiver is a ஒரு வழி இணைப்பை, it only supports unidirectional transmission.
The COFDM transceiver consists of two sets of COFDM transmitters and receivers, which transmit in opposite directions so that one device can receive and send data, காணொளி, and audio to another paired device. So COFDM Transceive is a two-way transmission link.
Both COFDM transceiver has ethernet IP RJ45 connectors, it is like an invisible net cable. It supports connecting an IP camera and also supports connecting two far-way computers, it supports running ping commands at Windows OS CMD, which will feedback on the transmission time.
How to choose a COFDM Transceiver?
When choosing a COFDM transceiver, you may need to consider several factors:
அதிர்வெண்
COFDM transmitters and receivers transmit in one direction, so only one frequency needs to be considered. COFDM transceivers are bidirectional transmissions, so two frequencies need to be considered. The two frequency ranges should be separated as much as possible to avoid interference. In order to eliminate clutter and avoid interference, it is also necessary to consider adding a wave pass filter.
The specific frequency range can be from 170 க்கு 860 மெகா ஹெர்ட்ஸ். உதாரணமாக, select 300Mhz for the uplink frequency and 600Mhz for the downlink frequency.
The specific choice should also consider the local frequency occupancy situation. If there is DVB-T or DVB-T2 digital TV in the local area, it is also necessary to avoid the frequencies that have been selected by digital TV as much as possible.
After selecting the frequency for transmission, the frequency of the receiver must also be kept in the same range to complete transmission and reception.
அலைவரிசை
Unlike digital TV, which has 6, 7, and 8Mhz bandwidth, the COFDM transceiver’s bandwidth can be customized, such as 2MHZ and 4MHz.
பவர் ஆம்ப்ளிஃபயர்
The power amplifier mentioned here is a device that can increase the power of the COFDM signal output from the transmitter, which can improve signal quality and coverage.
The power amplifier of the COFDM transmitter needs to maintain signal linearity and efficiency. பொதுவாக, choose the appropriate power amplifier based on the distance you need to transmit. The following is a table of correspondence between transmission distance and power amplifier for your reference.
| பவர் ஆம்ப்ளிஃபயர் | தி | NLOS |
| 500mW | >10கி.மீ | <300மீ |
| 1டபிள்யூ | >30கி.மீ | <500மீ |
| 5டபிள்யூ | >60கி.மீ | <1500மீ |
| 20டபிள்யூ | >120கி.மீ. | <3000மீ |
| 50டபிள்யூ | >200கி.மீ | <5000மீ |
| 100டபிள்யூ | >250கி.மீ | <10கி.மீ |
உணர்திறன்
Sensitivity refers to the ability of a wireless video transmitter to transmit weak signals and have them received by the receiver.
Sensitivity is usually measured in decibels (டெசிபல்) or decibel milliwatts (dBm) and represents the minimum signal power level that a transmitter can detect and process.
The higher the sensitivity, the better the performance and range of wireless video transmission.
The products of COFDM Transceiver
COFDM usually has two COFDM operating frequencies from 170Mhz to 860Mhz. The selected frequencies need to be as far apart as possible to avoid mutual interference.
In actual use, it is necessary to add a PA power amplifier, filter, and antenna matching the working frequency.
The package of the COFDM Transceiver
COFDM transceiver, also named Bidirectional COFDM Ethernet Radio, Bidirectional Wireless Ethernet Bridge.
Can you customize the frequency 340Mhz and 554Mhz COFDM transceiver for me?
ஆமாம்.
Why the two filters per transciever are used? One filter for RX and one PA for TX are enough?
- Filters are added to avoid interfering with or being interfered with by other devices.
Please test the transceiver first without connecting the filter. - The transmitter adds a filter because it has a power amplifier, It will emit a strong signal to avoid interfering with other equipment on the plane.
- The receiver add filter allows the receiver to receive only the desired signal and avoid clutter, and that signal sensitivity is improved.
- You need to connect the filter when the transmission distance is not far or the signal strength is very poor in the test.
- If the transmitter does not add a filter, it may interfere with the flight control or the power battery. Some customers have encountered this phenomenon before, and the filter has solved the problem.
- You take the sample now and suggest buying it together when you test it and need the filter, and it will take more time and freight to deliver it.