qam antenna

1. DBM DBM is the absolute value of power. The formula is: 10lgp (power value/1 MW ). [Example 1] If the transmit power P is 1 MW, it is converted to dBm and then 0dbm. [Example 2] for 40 W power, the converted value in dBm unit should be: 10lg (40 W/1 MW) = 10lg (40000) = 10lg4 + 10lg10 + 10lg1000 = 46dbm. 2. DBI and DBD DBI and DBD are the obtained Gain values (power gain). Both are relative values, but the reference standards are different. The reference of DBI is a full-direction

Several employees in unit A usually use laptops. Due to work reasons, they need to set up wireless networks for resource sharing. Also, several employees in Room B need wireless networking; by nature, building A slightly larger Wireless LAN can meet the wireless Internet access needs of all employees in Room A and room B. Considering the security concerns, the company intends to build A wireless LAN for several employees in Room A to prohibit employees in other offices from accessing the privacy

receiving devices located behind the obstacle will receive very weak signals or fail to receive signals. What about penetration? This is what many netizens are most concerned about. We all hope that wireless signals can penetrate the walls of the house at least. To improve the ability of wireless signal to penetrate the wall, an effective way is to improve the antenna gain. We 'd better choose a product with a high

environment, the distance is short. Generally, the home wireless LAN equipment claim that the transmission distance is more than 100 meters, so the signal transmission distance is not a problem. However, the home environment brings about a new problem, that is, the home space is crowded and the space is not open enough. The walls in the room are the main obstacles. The wireless LAN uses wireless microwave frequencies. The biggest characteristic of microwave is that it is almost linearly transmi

transmit signals from the antenna to various directions. Therefore, it is necessary to consider the signal strength based on the transmission radius. If our router is close to the wall of the neighbor apartment, they will get part of our signal. As a result, we can try to place the router in the center of the home without considering the limitations of the desktop computer and the home modem. In this way, the signal strength sent by the router can sp

Wireless Transmission path analysis is an important step in wireless transmission network design, through the analysis of the transmission path to facilitate the network designers to choose the appropriate type of antenna (direction, polarization, gain and other indicators) according to the margin size of the wireless link, install the antenna height, select the appropriate feed cable and length. The follow

in the middle of the sea? That's the bridge! Amazing! The total length of the Highway Bridge in Shenzhen Bay is 5545, and the length of the side bridge in Shenzhen is about 2040. The bridge is constructed according to the standard of the two-way six-lane expressway. The bridge deck is 38.6 in width and has a design life of 120, it is a cable-stayed bridge with single-tower single-cable surface Steel Box Girder. It is currently the widest and highest standard highway bridge in China. the bridge

different wireless access devices. Make sure each one of them is able to surf the internet efficiently and wirelessly. To adjust the antenna position to promote network performance Normally, wireless internet nodes or wireless router devices will be attached to the Internet antenna, and different models of equipment with the antenna is different, then the in

distribution of the AP. In certain cases, each of these three methods works well, but none of the three methods can fundamentally address the problem of radio interference. Today, the majority of the AP is the omni-polar antenna used in the market. These antennas transmit and receive at a comparable rate in all directions. Since these antennas transmit and receive at the same speed in any case, the only option for these devices is to confront the dis

IEEE802.11 and ieee802.11b standards, can easily increase the wireless LAN load capacity and reduce the total cost.The wireless network of 80,000 People stadium project is divided into two parts: wireless network backbone bridge part and wireless network indoor and outdoor coverage part. The backbone bridge part uses the wireless network Bridge and the directional antenna completes the wired network the extension, the covering part includes Shanghai

The RF signal of the radio transmitters output is transmitted to the antenna via a feeder (cable) and radiated out by the antenna in the form of electromagnetic waves. ElectromagneticWhen the wave arrives at the receiving location, it is received by the antenna (only a small fraction of the power is received) and sent to the radio receiver via the feeder.Therefor

of wireless networks is much more difficult than ensuring the security of wired networks. Because the wired network only has a limited number of fixed access points, and the wireless network can be connected from any point in the range permitted by the antenna. Design antenna placement The first step to keep the Wireless Access Point Closed is to place the antenna