pigtail antenna

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

Analysis of demand and application of microwave trunk access for ISP group usersThe Computer network communication protocol is TCP/IP;Provide at least >64kbps data communication rate;Network isolation is implemented by the local router;Establish a Level two network, select the users with better geographical conditions to establish a secondary center to meet the requirements of user access within the metropolitan area;The omni-direction antenna can be

2.4ghz11mbps technology speed slow compatibility good price low 802.11g 2.4ghz/5ghz54mbps Mainstream technology fast compatibility good price low 802.11N (draft) 2.4ghz/5.8ghz300mbps future technical speed fast compatibility difference price high Misunderstanding, the stronger the signal, the better. First of all, let's take a look at some of the wireless product hardware indicators: transmission power, acceptance sensitivity and antenna gain. At

function in each data call connection let u, implement Fm-wan concurrency.**/public void Setnotchfilter (Boolean value) {fmreceiverjni.setnotchfilternative (sFd, v4l2_cid_private_tavarua_set_ Notch_filter, value); }/*** Enable/disable analog low power mode.* * This method enables/disables analog low power mode.**/Public Boolean Setanalogmode (Boolean value) { int re = Mcontrol.setaudiopath (sFd, value); Re = fmreceiverjni.setanalogmodenative (value); if (re = = 1)

(Boolean value) {fmreceiverjni.setnotchfilternative (sFd, v4l2_cid_private_tavarua_set_ Notch_filter, value); }/*** Enable/disable analog low power mode. * * This method enables/disables analog low power mode. **/Public Boolean Setanalogmode (Boolean value) { int re = Mcontrol.setaudiopath (sFd, value); Re = fmreceiverjni.setanalogmodenative (value); if (re = = 1) return true; return false; }/*** returns TRUE if the internal FM

-40dBm, RXP is set to-110, C2 offset is 50, and MS is reselected to the residential area when it passes through the road section. On-site inspection of the signal source, it was found that the signal was sent by the antenna next to the pole at the junction of Dahe Road and Tianhe Road. Photo of the antenna location: On this antenna, the frequency scanner scans f

Antenna placement Time limit:1000 ms Memory limit:65536 K Total submissions:5486 Accepted:2743 DescriptionThe global aerial research centre has been allotted the task of building the maximum th generation of mobile phone nets in Sweden. the most striking reason why they got the job, is their discovery of a new, highly noise resistant, antenna. It is called 4 dair, and c

elimination for users P maximizes energy for expected users P minimizes interference with other users L The array antenna and the assignment algorithm can provide additional gain of more than 15 dB, thus: P adds coverage to improve the signal receiving quality during buildings and high-speed motion P improves the signal reception quality and reduces the disconnection rate P increases system capacity P reduces the transmit power and prolongs the batte

the short term, it will become a standard feature of almost all 11ac products. MIMO was first introduced in the 802.11n standard. It was introduced to solve a previous problem, but it significantly increased the data transmission rate of Wi-Fi. The previous problem is called the "multi-path" problem, that is, when a wireless signal is transmitted, It will be reflected by the surrounding objects, this allows the signal to arrive at the receiver along multiple paths at different times and angles.

article refers to all standards based on 802.11, including all types of extensions 802.11b/a/g/e/I ). The network we imagine includes an access point (AP) with an antenna, used as a Wireless 802.11 Home Network, and also includes coaxial cable connections. The Network also includes two types of sites (STA): one is to connect to the network through a coaxial cable, and the other is to connect wirelessly. Remote antennas can also be attached to a node

?As we all know, IC chip packaging SMD and double-row in the sub-type. It is generally believed that the difference between SMD and double-row is mainlyIt is different in volume and welding method, which has little effect on system performance. actually otherwiseEvery trace on the PCB has an antenna effect. Each component on the PCB also has an antenna effect, the larger the conductive part of the component

For an RFID system, the concept of Frequency Band refers Frequency Range of tag signals sent, received, and read by the reader through an antenna . In terms of application concept, the operating frequency of the RF tag, that is, the operating frequency of the RFID system, directly determines all aspects of the system application. In an RFID system, the system works just like we usually listen to FM broadcasts. RF tags and Readers must be modulated to

GPS (global positioning system), Global Positioning System:GPS consists of three parts:1. Space:The spatial part of GPS is composed of 24 working satellites. It is located over 20 200km of the earth's surface, evenly distributed on 6 orbital planes (4 in each orbital plane), and the orbital angle is 55 °. In addition, three active backup satellites are running in orbit. The distribution of satellites allows more than four satellites to be observed anywhere and at any time in the world, and the n

. Synchronization Port:The output is a TTL-level pulse signal, the rising edge is the synchronization benchmark, and the falling edge is the end of the data. You can enter the AT command to modify the can port, UART port, and USB port settings. During its long-term cooperation with the partner, huiju communication understands various requirements for device development. In order to allow technicians to develop wireless synchronization application device prototypes as soon as possible, it has re

strength. No linear transmission is required. The maximum outdoor transmission range is 300 meters, and the maximum indoor transmission range is 100 meters if obstacles exist. This is the most widely used transmission protocol. How wide can WLAN cover? Generally, the scope of WLAN coverage depends on whether the environment is open or not. If an external antenna is not added, it is about 250 m in the field of view. If it is a semi-open space with an

used to set up a wireless network. In this way, network resources can be shared in a wireless mode with an existing wired architecture. Q3: Will WLAN interference or affect the operation of other devices? ANS: basically, the frequency band used by wireless networks is within the high frequency range of ISM 2.4GHz. It does not interfere with the electrical appliances used in daily life or office, because the frequency is quite different, in addition, the wireless network itself has 12 channels a