tnc antenna

radiation transmission mode. Therefore, from the disturbed sensors, the interference coupling can be divided into two kinds: conduction coupling and radiation coupling. The conduction transmission must have a complete circuit connection between the jamming source and the sensor, and the jamming signal is transmitted to the sensor through the connection circuit, and the interference phenomenon occurs. The transmission circuit may include a conductor, a conductive component of the equipment, a p

meters, outdoor farthest not exceeding 50 meters. In addition, the antenna with high gain can be considered to solve this problem. Because of its no directionality, omni-directional antenna is used in the central station of point-to-point communication. Directional antenna has the maximum radiation or receiving direction, so the energy concentration, the gain r

price is hard to accept. However, it should be emphasized that each product has its own market positioning, wireless packages are mainly facing the "impoverished" of the primary users. Those who already have a certain basis to buy wireless package although some inconvenience, but not necessarily spend money. Here is a kind of practice is worth learning: in the market to find a "like-minded" friends, two people need to buy a set of wireless package. Contact each other before you break up so tha

machines use two PRISM chip-based 802.11b wireless NICs. Although many tools (such as Kismet) used in subsequent operations can support a wide range of wireless network adapters, we recommend using a PRISM 2 Chip-based network adapter, this chip can be supported by all the tools we need to use during the cracking process.Wireless NICs generally have two types of antennas: External antennas and built-in antennas. If the purchased wireless NICs do not have built-in antennas, you must purchase ano

, flexible compatibility with desktop and laptop, this is the greatest temptation. We recommend that you do not consider the SD interface or Express card interface products for the time being. SD-interface wireless NICs require devices to have SDIO interfaces, which are only supported by a few PDAs and are expensive. As for the Express card interface, although it does not doubt the long-term trend of replacing the PCMCIA Interface, at least it is too advanced. Option 2 for wireless network adap

is a little troublesome to remove the palm tray. First, remove all the No. 4 screws at the bottom of the fuselage and all the No. 1 and No. 2 screws at the front of the fuselage. You can then open the palm tray with a slight force on the right of the front, you can see the wireless network card expansion slot, load the built-in wireless network card and connect to the antenna, and then install the palm and keyboard in sequence. Other brand models can

into different areas of the class so that everyone can feel warm. Therefore, the size of the micro base station is much smaller than that of the macro base station, and the power consumption is also reduced. You may want to ask, why are the antennas of macro base stations so large and the antennas of micro base stations so small? Or, why do we have to use long antennas for our mobile phones, but now we have no antennas? Relationship between antenna

introduce how to disassemble the keyboard and palm rest-first remove the four No. 3 screws at the bottom of the fuselage, then flip the fuselage and push the keyboard forward, the keyboard will jump out of the body. Unplug the data cable from the interface on the motherboard, and the entire keyboard is completely detached. Be sure to note that there is a data cable under the keyboard connected to the motherboard, must be gently forced, so as not to break. It is a little troublesome to remove th

Protecting our wireless networks to the maximum extent is a matter of great concern to us. From which aspects should we manage and set them? Here we will introduce it to you. The purpose of reasonably protecting wireless access points is to isolate wireless networks from outsiders who are not authorized to use services. It is often easy to do. In terms of security, wireless networks are usually more difficult to protect than fixed wired networks, because the number of fixed physical access point

psmp-dtt1 moment), and then sequentially send the node corresponding to the buffer broadcast frame, here PSMP-DTT time, the inter-frame interval can be used rifs, in order to achieve higher efficiency. For the ACK part, because the author did not do the detailed textual research, so did not describe. When the PSMP-DTT time is over, the node sends a data frame, such as STA1, to send the upstream data in the PSMP-UTT1, in turn, within its corresponding upstream dispatch cycle. When the Psmp-utt t

Because a desktop with a wireless network card is equipped with a black wireless network card antenna, you must connect to the wireless network card antenna before normal wireless Internet access.Solution:1. Check that the wireless Nic Antenna interface behind the host is not connected. The Wireless NIC antenna comes s

is surrounded by peripheral devices such as capacitors, resistors, etc. that are required for the chip to work properly. The yellow serpentine pattern on the left is the PCB antenna. It is a way of using the wires on the printed circuit board as an antenna. The advantage of this antenna is that it is smaller and cheaper than the external

send data to the reader. The data includes not only the ID (globally unique ID), but also the data pre-existing in the eeprom of the label. Because passive tags have the advantages of low price, small size, and no power supply. RFID tags in the market are mostly passive. Semi-active Generally, a passive tag antenna has two tasks: first, to receive the electromagnetic wave sent by the reader, to drive the tag IC; second, to return the signal from the

there are tags nearby. RFID is usually called a near-pairing system for communication at a very close distance. The range of near-pairing systems is usually 0 to 1 cm. This means that the tag is appended to the reader or pressed to the reader. The advantage of this close distance is that the label battery plant can produce a lot of energy. This energy is sufficient to support tag communication without the need for Built-in power. Near-matching is also conducive to highly confidential occasions.

, and the distance from the battery should be far enough. HW also requires that the Id be placed near the antenna without metal accessories. We can imagine that the manufacturing cost of a mobile phone with a built-in antenna is 20-25% more expensive than that of a mobile phone with an external antenna. The main factor is the design of the

Wireless networks have become the preferred network access solution for families and small and medium-sized enterprises, and some problems have emerged. Due to the large area of some houses, the structure of the residential buildings is changeable, and there are many obstacles, the signal attenuation of the wireless network is great, resulting in incomplete wireless coverage, weak wireless signal strength and low wireless speed in some areas, there are even wireless blind spots and other situati

online.SIM300 Module appearance The SIM300 is a three-band Gsm/gprs module that operates on a global scale of egsm 900MHz, DCS 1800MHz, PCS 1900MHz Three frequencies, provides up to 10 GPRS multi-channel types, and supports CS-1, CS-2, CS-3 and CS-4 four kinds of GPRS coding schemes. SIM300 internal function modules are:Keyboard and SPI type LCD interface for users to develop their own application equipment.Two serial ports with debug and data output to help developers develop products more ea

Establish communication links between two points (e.g. headquarters and branch offices, network centers and communities). According to customer needs and the actual survey of the situation, there are the following types of transmission:(1) AB two points between visual, no obstruction, no electromagnetic interference, or small interference, AB two points between the distance between the network bridge equipment communication distance requirements.Can use the point to point Way direct transmission

Wireless network systems can cause serious security problems if they do not take appropriate security measures, whether the wireless system is installed at home or in the office. In fact, some providers of Internet services for residential areas have banned users and other unauthorized people from sharing networking services in their service agreements. An insecure wireless network can cause services to be lost or exploited to launch attacks on other networks. To avoid some of the similar wirele

There are several possible causes for this failure: (1) wireless network card distance from the wireless AP or wireless router is too far, more than the coverage of wireless networks, wireless signal to reach the wireless network card has been very weak, so that wireless clients can not be normal connection. (2) The wireless AP or wireless router does not power up or does not work properly, causing the wireless client to not connect at all. (3) When the wireless client distance from the wir