Influence factors to GSM signal have?

Influence factors to GSM signal have?
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China mobile base area of the system, the coverage several KM; The regional system and unicom, can cover dozens of KM; Radiation frequency size and energy decided to coverage.
From another Angle, by the point of view of the conservation of energy analysis: cell phone radiation of the large base station radiation small (GSM), and cell phone radiation of the small base station radiation (CDMA)
Generally divided into the following several system: transmission system, including SDH equipment, optical fiber, cable, etc.; The power system, storage battery, the utility, etc.; Move ring monitoring systems; Day feedback system; BTS Lord equipment; And other auxiliary equipment, such as air condition, security doors, and so on
GSM900 and DCS1800 is normally we speak of excited network, they are all GSM standards. Two system function the same, the main frequency is different, GSM900 work in the 900 MHZ, 1800 MHZ in DCS1800 work. China's most

The major difference between CDAM and GSM

The major difference between CDAM and GSM
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CDMA is the abbreviation of CDMA (Code Division Multiple Access), it is in the digital technology branch of spread spectrum communication technology, developed on a new and mature wireless communication technology. CDMA technology is based on the principle of spread spectrum technology, will need to transmit signal bandwidth has certain information data, with a bandwidth far outweigh the signal bandwidth of high-speed pseudo-random code for modulation, the original data signal bandwidth be expanded, then the carrier modulation and send out. The receiving end use exactly the same pseudo-random code, and receive the bandwidth of the signal for relevant processing, the broadband signal into the original information data of narrowband signal that is expanding solution, in order to realize information communication.
GSM is Global System for Mobile Communications of the abbreviations, meaning the Global System for Mobile Communications, one of the world's leading one of the cellular System. GSM ?

What is a GSM

What is a GSM
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GSM (Global System for Mobile Communications universal Mobile telecommunications System), is an open, evolving the improved System. This system is one of the advantages of the strongest in having the function of international roaming, consumers can with a number, in more than 159 countries don't accept all of the same quality blocked telephone service.
GSM standards will continue to improve the evolution, and radio, satellite and mobile system to provide more sharply with the service, including high speed multimedia data service, the service for synchronization using a built-in support, and will the Internet and fixed network perfect union.

And answered the white LED drive circuit diagram

And answered the white LED drive circuit diagram
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As with TPS61040 booster converter to drive the parallel LED. Figure in FB pin through &gnd connection between a 15 Ω external resistance R1, according to the feedback voltage (VFB = 1.233 V), TPS61040 can provide 80 mA LED the constant current. The design allows for use in output physical size smaller external devices (use ceramic capacitors instead of tantalum capacitors), this is due to the high frequency switch TPS61040 provide 1 MHz. PWM control tube feet used to control the brightness of the LED lights. And answered the white LED drive circuit diagram:

NE556 touch of dimmer circuit

NE556 touch of dimmer circuit
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This circuit can realize the brightness of the light by dark brighten (light), by bright dark (the). Use touch components of realize touch control, and so in addition to touch piece outside, still need to plus a touch circuit (can choose sk-ii integrated circuit). Additional, because of bright dark dark brighten is a delayed hige, so need to choose a certain "delays" circuit, therefore, integrated circuit, and the NE556 can use. In addition, the light of the control is generally through the thyristor and the light of the direct connection, realizes to light the hige control circuit. In essence the thyristor and lamp light control of main circuit, touch of + touch circuit + base integrated circuit NE556 subprime circuit of components. NE556 touch of dimmer circuit:

LM3423 consists of the booster LED drive circuit

LM3423 consists of the booster LED drive circuit
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The picture, when EN pin command boost converter failure after, the Lord switch, nDIMFET pin and FLT pin will be closed, from the current will flow into the Vin approach and zero, effectively avoid any leakage current flow into the series of LED together, because right now the boost converter have failed. Leakage current due to no longer there, when stop the battery can be packed, so can effectively extend battery life. LM3423 consists of the booster LED drive circuit:

FANUC system alarm 401 how to solve? Already determined is amplifier fault, and exclude amplifier module, floor should be good

FANUC system alarm 401 how to solve? Already determined is amplifier fault, and exclude amplifier module, floor should be good
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How to swap?
1. A bad for good, good to change bad, good or bad appear alarm?
2. Good in the good, the bad in a bad, two cases the police?
To hear you say so, can eliminate the problem of the parameter is set up.
Check the power supply before changing unit of over 24 V, if 24 V appear problem, change into good may also take the good is burnt out. Has this alarm, lead to the alarm of reason not just servo amplifier or cable.
Eliminate not the words suggest contact Beijing fanuc the on-site service solution. Sure they present it usually within half a day to go to the site.
Cross-examine me is the bad on the amplifier module, a change to the floor on the good results, is normal, and finally ?

Tianjin smoke sensor, smoke alarm manufacturers have?

System integration, network equipment, network smoke alarm, smoke, fire control system, a new fire detection alarm the photoelectric smoke detector is using modern technology... Domestic outfit project, now, facing the whole country procurement related materials, management, service outsourcing group telephone, process production suppliers, shenzhen exhibition fai enterprise Co., LTD. Provide smoke sensor (ZH-02), smoke alarm, smoke detectors, fire alarm system, smoke sensor, electronic alarm safety device products.
Control switch, call center smoke sensor (ZH-03) production suppliers, shenzhen exhibition fai enterprise Co., LTD. Provide smoke sensor (ZH-03), smoke alarm, fire alarm system, smoke detectors, smoke sensor, sensor products.
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Cn. Made-in-China. Com/showroom/zhanhuisales/product-detailIqHQfOcrIaYx/China-smoke sensor + (ZH-03). HTML-20 k-web page snapshot-similar nets ?

Graduation design: 51 single-chip microcomputer based on the computer room environment temperature monitoring system

Graduation design: 51 single-chip microcomputer based on the computer room environment temperature monitoring system, as an undergraduate, do to make the design "optimal"?
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The system mainly aim is to provide room environment temperature, humidity and the surrounding personnel, the electrostatic potential items, with high performance, high reliability, high efficiency, integration, multifunctional traits monitoring alarm device. Environmental conditions, especially the work environment temperature and humidity on electrostatic property has a great influence on the measurement, the measurement of static electricity is static electricity protective work important part. The engine room environment to be automatic monitoring alarm system can real-time monitoring the telecom room temperature, humidity, electrostatic index, abnormal circumstances can report to the police.

Water pollution on the society and economy brings the serious influence
1. The urban and rural residents threatens the safety of drinking water
Because of our country water environment pollution is serious, make urban and rural residents drinking water safety and security has been threatened. According to the investigation and statistics of the health department, our country has 65.4% of the population of substandard drinking water. The 1989 national environmental protection bureau to the national organization the key environmental protection cities protection of drinking water sources investigation and the results found that 48% of the surface water source, 20% of underground water sources can not reach the standard. Because water pollution caused by social problems quite outstanding. Among them is the typical is 1994 years, 1995 years, huai river mainstream continuous happen a water pollution accident, cause huainan and bengbu, millions of people use such as aimprovement no water to drink for a period of

The use of wireless microcontroller serial port on the problem of the module baud rate

I use the SCM and PC serial port of serial use cable communication, no problem
Now want to put the cable to wireless module, I want to ask next if switch to wireless, then wireless module of between sending and receiving baud rate and single chip microcomputer and computer end baud rate must agree or said may not consistent?
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If your module has a cache ability, it can need not consistent. It can only be consistent, wireless module transmission baud rate than single chip microcomputer and computer of between.

Microcomputer application technology curriculum design remote temperature gathering system

Proteus use as a development tool, complete the dual machine communication temperature gathering function:
Use LM20 temperature sensor, AD1674 adc, AT89C51 single-chip microcomputer, four dial of the code switch temperature acquisition module (from the machine), dial the code switch for the address of the set module (15), from the machine in the temperature signal collection (interval 5 S) through a serial port after sending to host;
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Use AT89C51 single-chip microcomputer, four to dial the code switch, the LED display temperature of receiving module (hosts), four to dial the code switch for setting communication baud rate (1200240 0480 0960) when the host baud rate change, from machine baud rate also automatically change, power operation shows baud rate information (stop 3 S), after receiving the address and temperature display information, when receiving time interval more than 6 S not received data, warning systems;
A single chip microcomputer ? only
This kind of paper many people write, suggest you go to know nets download, won't you can go to my baidu search space look, there is how to find the method and process of paper

Single chip microcomputer which several typical application structure and application software structure

SCM is to point to an integrated in a complete computer system on a chip. Although most of his function integration in a small chip, but it has a complete computer need most of the parts: the CPU, memory, and the external and internal bus system, at present most will have CRT. At the same time such as communication interface integrated, timer, real time clock and peripheral equipment. And now the most powerful of the single chip microcomputer system can even sound, image, network, complex input/output system integration on a single chip.
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SCM is also called micro controller (Microcontroler), because it was the first used in the industrial control area. By chip microcontroller within the CPU only dedicated processor. The first design concept is through the huge amounts of peripherals
Single-chip microcomputer and says monolithic micro controller, it is not a complete a logical function chips, but put a computer system integration to a chip. Summary of speak: a chip to become a computer. Its small volume, light quality, price cheap, application and development of learning, provides the convenience. At the same time, learn to use single chip computer is to know the principle and structure of the best choice.
Single chip microcomputer and computer with interior also functions as the modules, such as CPU, memory, parallel bus, and of the same effect and hard disk storage device, different is that it's these parts performance is our home computer weak many, but the price is low, usually less than 10 yuan can...... Use it to do some control electric appliance kind of is not very complicated