Инструкции за трансивър за далечни разстояния за TX900

Precautions

1. Before powering on, please ensure the device and antenna are reliably connected, в противен случай, the equipment inside the PA (усилвател на мощност) may be damaged. Please check carefully the transceiver RF and antenna connection.

2. Please ensure that the power supply voltage of the device is within the rated voltage range of the device, otherwise the device may be damaged.

1. The power supply range of TX900-2W equipment is DC12~18V and recommended to use a DC 12V power supply.
2. The power supply range of TX900-5W equipment is DC24~28V and recommended to use a DC 24V power supply.
3. The power supply range of TX900-10W equipment is DC24~28V and recommended to use a DC 28V power supply.
4. Power supply capacity: The power supply for the TX900-2W device needs to reach 2A@12V, the power supply for the TX900-5W device needs to reach 3A@24V, and the power supply for the TX900-10W device needs to reach 4A@24V. When the power supply current is insufficient, the wireless transmission distance will be seriously affected.

3. Please ensure that the antennas at both ends of the device are perpendicular to the ground and are not blocked by obstacles, otherwise the transmission distance will be affected. (THE, line of sight)

4. The antenna should be installed as far away from other large metal parts as possible, and a clearance of at least 20 cm should be ensured around the antenna.

5. Please be sure to use the antenna model specified by the manufacturer to ensure that the frequency band, импеданс, and other parameters match.

6. After the device is turned on, it takes about 30 seconds to start up. Data can only be transferred after the startup is completed.

7. Please ensure that the surrounding environment where the device is used is free of interference from high-power wireless transmitting devices of the same frequency, otherwise the wireless transmission distance may be seriously affected.

8. When the reception signal is poor, you can try to improve it by changing the antenna tilt direction.

9. TX900 is an asymmetric wireless link. The transmission code stream in one direction is large and the transmission code stream in the other direction is small. When using it, you need to place the device marked “transmitting end” on the video transmitting end, and the equipment marked “receiving end” on the video receiving end.

Wireless link connection parameter viewing and problem analysis:

1.1 Check the wireless connection signal strength simply through the device signal light

Check the wireless connection signal strength through the working indicator light of the TX900 device:

• Power LED: red power indicator light, always on when power is supplied normally.
• Светодиод на възела: blue node type indicator. It is always on when the module is configured to work as a central node and flashes when it is configured to work as an access node.
• линк LED: Wireless link status indicator light. Its working status is as follows:

линк LED	Indicates that the wireless link of the module has been connected and the wireless signal strength is extreme.
not bright	Показва, че безжичната връзка на модула не е свързана.
червен	It means that the wireless link of the module has been connected, но силата на безжичния сигнал е много слаба.
orange color	Indicates that the wireless link of the module has been connected and the wireless signal strength is medium.
зелено	Indicates that the wireless link of the module has been connected and the wireless signal strength is very strong.

1.2 View node wireless parameter reporting through Web UI

TX900 can view the current parameter configuration through the network port Web UI and modify it according to application needs. Users can access its IP address through the network port browser.

The default shipping address of the TX900 video receiver is http://192.168.1.11/, TX900 video transmitter’s default shipping address is http://192.168.1.12. (Please modify your computer to support the 192.168.1.xxx network segment first).

The figure below shows a typical wireless connection of two TX900 wireless nodes. This typical connection will be used as an example later (see the figure below for details of the corresponding node name and IP address).

In this example:

• Remote Air Transmitter side
• IP address: 192.168.1.12
• Configure as the access node
• Used as a video transmitter

• Local Ground Receiver side
• IP address: 192.168.1.11
• Configure as the central node
• Used as a video receiver

UP-DOWN Setting: [config3(1D4U)] или [config0(2D3U)]

• компютър
• Connect to the local central node via network cable
• Can be accessed separately through the Windows browser
• central node is http://192.168.1.11/
• access node is http://192.168.1.12/

Check the wireless parameters reported by the central node:

As shown in the figure below, click the debug item, wait until the page reports web socket connect success, and then click the start button.

When the central node and the access node are connected wirelessly, the wireless parameters reported on the central node can be seen as follows:

Report parameter description:

Description of corresponding items of reported parameters:

• [16:53:17] Current time (the browser’s computer’s current clock)
• IP:12 The fourth number of the connected access node IP address (in this example, the access node IP address is 192.168.1.12)
• ANT2 антена 2 of this central node (the following parameters are the parameters corresponding to the node 192.168.1.12 received by this node ANT2)
• ANT1 антена 1 of this central node (the following parameters are the parameters corresponding to the node 192.168.1.12 received by this node ANT1)
• RSSI:-68 RSSI value when receiving 192.168.1.12 wireless node
• RSRP:-98 The RSRP value when receiving the 192.168.1.12 wireless node. When the distance is about 1 метър, the RSRP can reach the maximum value of -44. As the distance increases, the RSRP value will become smaller and smaller.
• Tx:22dBm The current transmit power of the wireless modem of this node is 22dBm, and the current actual transmit power of this node = 22 + power amplifier gain
• SNR:+23[+19~+27]dB SNR value and variation range when receiving 192.168.1.12 wireless node. When the distance is very close, the SNR value can reach about 23~28, and when the distance is far away, the SNR value will become smaller and smaller. When the SNR values ​​of ANT1 and ANT2 are both lower than -10, although the wireless connection can be made, the bit stream that can be transmitted is already very small, and video cannot be transmitted at this time.
• разстояние:0m The distance between this node and the 192.168.1.12 node, in meters
• Error_per:0%, Error_per_total:0% Bit error rate when receiving 192.168.1.12 данни

Check the wireless parameters reported by the access node:

The parameters reported by the access node represent the signal parameters when the access node receives the wireless signal from the central node. Its form and parameter meaning are similar to those of the central node.

1.3 Wireless noise floor

Wireless noise floor has a great impact on wireless transmission distance.

In a quiet room, two people speak very quietly and can hear each other clearly even though they are several meters apart. But if you are in a very noisy environment such as a karaoke hall, two people facing each other need to speak loudly in order to hear each other clearly. Wireless communications are similar. If two wireless nodes communicating with each other are in an environment with a very large wireless noise floor, even if the transmission power is high, the transmission distance will be very short. On the contrary, if the wireless noise floor is very small and clean, then even a small transmission power will transmit a long distance.

When two TX900 devices communicate, the wireless noise floor can be calculated and evaluated through the reported wireless parameters.

If one TX900 node is fixedly placed at a certain location and the other TX900 node is gradually moved further away, the SNR values ​​reported by the two nodes will become smaller and smaller. Taking the central node as an example, when the access node is far away from a certain distance segment,The SNR values ​​of the two antennas of the central node receiving the access node are between 0 и 10., по това време, the wireless noise floor at the central node is:

Wireless noise floor at the central node = RSRP-SNR

The same method can be used to calculate the wireless noise floor at the access node. When the SNR values ​​of the two antennas at the access node receiving the central node are both between 0 и 10, the wireless noise floor at the access node is:

Wireless noise floor at the access node = RSRP-SNR

Regarding the calculation of wireless noise floor, the calculation is meaningful only when the SNR of the two antennas of the same node is between 0 и 10. If the SNR of the two antennas of the same node does not fall between 0 и 10 по същото време, the calculation is meaningless.

Пример 1

The parameters reported by the central node are:

[18:30:37] IP:12 ANT2, RSSI:-86, RSRP:-118, Tx:24стока, SNR:+2[+1~+6]децибела, разстояние:31060м,  Error_per:0%,  Error_per_total:0%
[18:30:37] IP:12 ANT1, RSSI:-81, RSRP:-112, Tx:24стока, SNR:+7[+6~+11]децибела, разстояние:31060м,  Error_per:0%,  Error_per_total:0%

По това време, the wireless noise floor at the central node is:

ANT1 wireless noise floor = RSRP-SNR = -118-2= -120

ANT2 wireless noise floor = RSRP-SNR = -112-7= -119

The parameters reported by the access node are

[18:30:42] ANT2, RSSI:-81,RSRP:-111, Tx:24стока, SNR:+10[+10~+12]децибела, разстояние:31070м,  Error_per:0%,  Error_per_total:0%
[18:30:42] ANT1, RSSI:-88,RSRP:-119, Tx:24стока, SNR:+4[+3~+6]децибела, разстояние:31070м,  Error_per:0%,  Error_per_total:0%

По това време, the wireless noise floor at the access node is:

ANT1 wireless noise floor = RSRP-SNR = -111-10= -121

ANT2 wireless noise floor = RSRP-SNR = -119-4= -123

When our wireless equipment is shipped, the wireless noise floor of the device itself has been tested. The wireless noise floor of the TX900 device itself can reach between -122 и -126 (regardless of the central node, access node or Mesh node). If you find that the wireless transmission distance is much lower than the distance we told you in the relevant application scenarios/environments when using the TX900 device for distance testing, it is best to test the wireless noise floor at both ends. If the wireless noise floor calculated by a certain antenna of a certain node is not good during the entire test, then the wireless transmission distance will most likely be greatly reduced. Например, the wireless noise floor calculated by ANT2 at one end is only -115, което е около 7 worse than -122. No matter how the antenna angle and orientation are changed, the position of the node antenna is changed, and the distance between the two nodes is changed, the noise floor is the same as that of -122. (-122 да се -126) is obviously different, then the wireless transmission distance will definitely be relatively small.

1.4 Test antenna/antenna connection quality/antenna blocking situation

Find an open, open area with a relatively clean wireless environment (no wireless transmitting equipment, no high-voltage cables, no relatively strong wireless operator signals, и т.н.. nearby) за тестване. Fixedly place the two antennas on one end of the wireless node (note that the two antennas are perpendicular to the ground and kept parallel as much as possible, and the two antennas should be the same antenna), and gradually move away from the other end (the two antennas on the mobile end and the two antennas on the fixed end There should be no obstruction between the antennas as much as possible. The two antennas on the mobile terminal are also perpendicular to the ground and kept parallel. It is best for the two antennas on the mobile terminal to be the same antenna). Connect the computer through the network port at one end, access the web UI of the two nodes at the same time, and observe the wireless parameters of the two antennas of the nodes at both ends during the entire movement to report data. Теоретично, when the mobile terminal is far away from the fixed terminal (например, several hundred meters away), the distance, ъгъл, orientation, и т.н.. between the two antennas at one end and the transmitting antenna at the other end should be similar. Следователно, the distance between the two antennas The wireless parameter reporting data (SNR\RSRP\wireless noise floor) should also be similar. Следователно, after being hundreds of meters away, when the SNR values ​​of ANT1 and ANT2 at one end are both between 0 и 10, the difference between the SNR\RSRP\wireless noise floor values ​​of ANT1 and ANT2 should most of the time be very small (например, в рамките на 3) is normal. If during the whole process of moving away, the SNR\RSRP\wireless noise floor values ​​of ANT1 and ANT2 at a certain end have always been quite different (note that three indicators should be paid attention to: SNR, RSRP, wireless noise floor, sometimes two of the parameters are normal , only one of them is always abnormal, which is also a problem), and the parameters of a certain antenna are always relatively low, then it is likely that there is a problem with that antenna (assuming that the wireless device itself is working normally):

• There is a problem with the antenna connection
• The antenna has been interfered by surrounding electromagnetic signals
• The antenna itself has quality problems
• The antenna has been blocked by obstacles on the side

По това време, when the distance is relatively far (SNR value is between 0 и 10), you can try to adjust the angle and orientation of the antenna with lower wireless parameters to see if there is an improvement, or swap the two antennas to see if there is an improvement. If it cannot be improved:

1) Check the antenna

2) Check antenna connection

3) Except for wireless devices and power supplies, turn off the power of other electronic devices (to exclude the possibility of electromagnetic interference from surrounding electronic devices) and retest.

4) The power supply is also far away from the two antennas (например, a distance of more than 1.5 meters through the power supply cable). In actual testing, we found that when the battery control circuit is close to an antenna, it will cause greater electromagnetic interference to the antenna’s reception performance.

1.5 Test methods and analysis

When testing according to the method described above, if the wireless noise floor of the two antennas of a wireless node at one end can reach -122 да се -126 at a certain moment, it indicates that the wireless performance of the end is very good. If the wireless noise floor of one or two antennas of a certain wireless node never reaches -122 да се -126 during the entire test process, the problems are:

1) If one antenna can reach it but the other one still cannot, then you need to troubleshoot the cause of the problem as described in 1.4;

2) If the two antennas of one node cannot reach it, but the two antennas of another node communicating with it can reach it, maybe the node with poor test results is in a large environment with poor wireless noise floor. . По това време, you can swap the test positions of the two nodes and test again. Теоретично, after the node with good test results is moved to a new location, there should be no problem with its wireless noise floor. If there is still a problem, it means that the environment where the test point is located has poor wireless noise floor. After testing a device with a good wireless noise floor, if the wireless noise floor is always bad when tested in a new test environment, it can be determined that the environment where the test point is located itself has a poor wireless noise floor. This method can also indirectly test the wireless noise floor of the environment.

1.6 Power supply capacity affects wireless transmission distance

If the power supply for wireless devices has insufficient supply voltage or supply current, it will seriously affect the transmit power of the wireless device, causing the transmission distance to fail to meet the requirements. Here are the power requirements for several of our two-way wireless link devices:

• 2W device: Supply voltage range: DC12~18V, the maximum supply current needs to reach 1.6A@12V.
• 5W device: Power supply voltage range: DC24~28V, the maximum power supply current needs to reach 2A@24V.
• 10W device: Power supply voltage range: DC24 ~ 30V, the maximum power supply current needs to reach 2.8A@28V.

For questions about long-range Transceiver Instructions for TX900, please contact us for free technical support.