GSM stands for Groupe Spécial Mobile. It is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for second generation (2G) digital cellular networks used by mobile phones.

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Location of modulation and multiplexing in a GSM network

My question is regarding the location of GSM channel access methods TDMA/FDMA. Here is an illustration how voice is processed before reaching the base station on a tower: It is not mentioning the ...
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7 views

Quectel m66 bluetooth usage?

I've been working on m66 and got it connected to PC via usb to serial converter, and got it up and running. AT command replies with ...
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1answer
52 views

Why does GSM allocate 200kHz data bandwidth for each mobile phone?

I read that the human range is commonly given as 20Hz to 20,000 Hz. But GSM channels are carrier frequencies of 200 kHz bandwidth. Is that because of SMS part? It seems for voice 20kHz must be ...
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1answer
51 views

How does a base station provide multiple channels without any interference? [closed]

A base station in the middle of a cell communicates with hundreds of users at the same time. How is that implemented? Is that achieved by using different carrier frequencies and different antennas ...
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1answer
32 views

Confusion on GSM, GPRS, EDGE, 3G, 4G

I'm using a smartphone. When I turn off the cellular data or my mobile phone, I can still call and send SMS. Does that mean in this case the mobile using GSM? How can I know if it is GSM or GPRS? And ...
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1answer
43 views

File transfer between two gsm modem

I'm wanting to build a system that will store value on a SD card to form .CSV file , that this is not a problem. There will be about 1000 value recorded daily.I'm wanting to send this values to a pc ...
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24 views

SIM800L basic operation

I got myself SIM800L and have some issue with it. After powering up modem will not register to network. AT OK AT+COPS? +COPS: 0 OK SIM card was tested and ...
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1answer
55 views

SIM800L power interface

I would like to use SIM800L for M2M. I have power of 5V 2A for powering uC board and would like to add gsm module. It seems that SIM800L has rather strange voltage input rating: 3.4V - 4.4V. What ...
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1answer
32 views

connecting a GSM booster directly to a mobile device? [closed]

I live right on the edge of mobile reception. I just get a signal with an external antenna, but it is weak. I am thinking of getting a small indoors GSM booster, like this. I was wondering if it ...
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1answer
69 views

how can we detect overspeeding through sensor or by building up circuit ??

I am working on project to detect overspeeding through sensor. but i am not getting any information regarding sensor. All i want to do, sensor inside vehicle with arduino and gsm which will send out ...
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41 views

Transmitting data over Long range ,using a Low Power Circuit

I Have Been Designing a BOT That Would Travel Along the Pipeline And Detect Leakage Using Ultrasound Efficiently,And Locate The Position of Leakage Using A GPS MODULE using the Arduino,I have make it ...
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1answer
98 views

GSM Modem will not register to network

after getting two modems (dev boards) Siemens TC35 and SIM900A I cannot get them to send sms. From the research it seems that somehow sim cards will not register to network. I bought three sim cards ...
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38 views

GSM SIM900A Board and USBtoSerial

just got my SIM900A board same as Connecting GSM SIM900A module with Ardunio and I am trying to connect it to my USB-rs232 converter. I couldn't find any doc on module itself, has anyone done it? Tnx ...
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1answer
374 views

How would I connect a GSM SIM900A v3.1 with Arduino UNO?

How would I connect a GSM SIM900A module with Ardunio Uno This is an image of it: Here is the datasheet
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1answer
66 views

GSM Battery/Amperage Usage

I have a general question. I have a GSM module (adh8066 link to data sheet below) that I purchased from sparkfun. In the data sheet, it states that in tx mode, the module can draw up to 2 amps @ ...
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2answers
309 views

GSM regulations for 850/900 MHz band and 1800/1900MHz

I understand that GSM regulations establish that transmissions power for two bands must be as follows, -Class 4 (2 W @ 850/900 MHz) -Class 1 (1 W @ 1800/1900MHz) But I also know that lower the ...
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3answers
119 views

least GSM power in dBm required to send an SMS

I deploy an application in the forest using an M2M module (SIM968). I have read through its datasheet but I am not able to find out what is the least GSM power that should be incident inside the ...
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2answers
72 views

Fuel Injection Control through OBD port?

I am trying to implement remote control of a car, by connecting a GSM device to OBD port. If someone is using my car, I need to remotely stop the vehicle by sending command. Upon sending STOP ...
2
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1answer
58 views

Can Cellphones/ be used for Ad Hoc Communication?

Can Cell Phones be (legally) used Adhoc, (ie, Point-to-Point) Communication? For example, let's say I'm in a remote area of the woods, or a valley. Can I configure cell phones to be used as true ...
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2answers
68 views

GSM modules or WiFi?

I'm trying to work on a prototype wearable indoor and I am really confused as to how I am going to transfer data fetched from the GPS device to the server. Is ...
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2answers
126 views

Is it possible to use SIM900 GPIO to control relays without using external MCU?

From the product manual / reference guide it looks like SIM900 / SIM900A is already equipped with 12 GPIOs. But could not find information on how to use these GPIOs to control relays directly, ...
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51 views

Low-powered sms > garage port opener

I have my car in a shared garage, with a standard 433mhz garage-port opener. I've been able to clone the opener, so I now have a tiny board with to cables that I can connect, and the garage opens. My ...
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2answers
78 views

Does a regular signal booster with antenna work for cell phone?

I am not that much familiar with communication and antennas. I want to build a gsm repeater (gsm signal booster), but I am not sure if it works if I do it like the way we do for a radio. What I am ...
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2answers
84 views

why smartphones don't cause noise on the around speakers

Before the smartphones (or maybe before the some new tech) when a cell phone rings, the speakers around it made noises. Hovewer, nowadays they do not. Why? What changed?
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2answers
107 views

Power Efficient GSM modules

I am developing a Kit with GSM module which have to receive and send commands. I have gone through many GSM modules(SIM900). All of them consume around 1.5A at burst time. So I am in trouble to ...
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135 views

Powering GSM Module from 2 x AA NiMH or 3 x AA alkaline batteries

I'm trying to power a gsm modem from 2 AA NiMH batteries in series, and wonder what my options are. Main consideration is that it needs to be USB rechargeable, so I only have 2 batts to work with. The ...
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1answer
65 views

GSM ZTE MG2639 module freezes after checking SIM

I'm communicating with my ZTE MG2639 module through UART. Few seconds after powering it and getting +CPIN and +STKPCI it just turns off (goes to stand by mode) It only happens with SIM card, and ...
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67 views

SIM900 GSM module power LED on but can't get signal

When I connect my module to power the power LED stays on but I can't get signal LED blinking. I am connecting it to my PC via serial port and using Putty software. I am using a SIM900 Flyscale module. ...
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1answer
54 views

How to handle nested final result code in AT-command text?

I am writing a parser (a finite state machine to be more precise) for AT-commands and I don't see how to handle a particular corner case: Here is the specifications of the modem communication: When ...
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2answers
99 views

2.8V UART to 5V MCU - how?

I'm trying to connect ZTE MG2639 to 5V AVR (or USB<->RS232). This module is using 2.8V at IO. How can I do that? Normal voltage divider? And how to check if communication is OK in Putty? Just type ...
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129 views

SIM908c GSM module with Arduino Mega without any shield

I needed to work with GSM so I bought a SIM908c module. Also I bought a breakout board to connect with Arduino Mega. I am using the gsmlib library for this module. My connections are as follows: ...
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36 views

Cell ID Based Location

certain M2M GSM modules provide an alternative method of finding possition when GPS signals are not available or jammed through Cell Tower IDs. These Cell tower IDs around a device are transmitted ...
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101 views

EDGE/GPRS connectivity vs SMS connectivity through 2G GSM

I use a GSM module in my design which will be working in low signal areas such as inside forests. My application is designed to transmit information to a server via an SMS but I would like to use ...
3
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1answer
76 views

pick and place cannot read LCC module

The assembly house has a P&P machine (Yamaha i-pulse M4S) and the export file is from Altium. All components are read from the machine fine except an LCC gsm module MG323-b which has a particular ...
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2answers
4k views

Connecting GSM SIM900A module with Ardunio

I have bought an SIM900A Mini V4 GSM module. Here is the module, I want to configure with arduino to send and receive SMS. Do I have to connect TXD of this module--Tx of Arduino & RXD of this ...
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121 views

Sending message in the GSM module v4

I got a GSM module v4. It has SIM900A IC. I tried to send SMS by using arduino uno. This is my code. void setup() { Serial.begin(9600); Serial.print("AT+CMGF=1\r"); delay(1000); ...
3
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1answer
122 views

simple GSM SIM modem

I'd like to build a prototype of simplest possible GSM device - a simple modem with SIM holder, capable of logging on to the SIM's provider network and nothing else. It's meant to be used as a GSM ...
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89 views

Isolation between GSM and GPS antenna

We are doing a prototype for a gps based tracker. We got a problem in placing the GSM and GPS antenna. Both the GSM and GPS antenna are omni-directional antennas. In forums and application notes, the ...
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2answers
147 views

Does an antenna work inside a plastic box

I need to put two antennas for GSM and GPS communication on my PCB. My final product will be embedded in a user-friendly plastic box with buttons, leds and switches. I have not choosed yet which type ...
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67 views

Easy-to-use Antennas for beginners

I am designing an embedded system with a GPS and a GSM modules both from the u-blox company. I need external antennas for my GSM and GPS modules. From what I see when I looked for antenna integration ...
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1answer
79 views

Relationship of antenna size to gain and directivity

This question is derived from certain answers I received for a previous question I posted. Case : Let's say I have two GSM antennas of the exact same shape, design and material. The only difference ...
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1answer
68 views

Gain vs. Directivity and effect of animal body to Antennas

My design works in a foresty area inside a collar of an elephant. These areas have at least -110dBm GSM strength (accurate ref. map linked) but, usually higher as I live in a small country where GSM ...
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2answers
2k views

SIM900 Error on AT Command AT+SAPBR=1,1

I intend to send some information through GET method to a php page using a SIM900 module. I tried the following sequence of commands with success. My provider doesn't require username and password for ...
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1answer
101 views

Important Parameters to Check while Chosing a GSM/GPRS Antenna [duplicate]

what technical parameters decide the performance of a GSM/GPRS antenna? (excluding power consumption and size) I have found out several antennas that have 3dBi gain. And I want to chose between them. ...
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125 views

Servo shaking when GSM module starts transmitting

I have a project which uses 2 Arduinos which is communicated with my phone by a GSM module, and that one of the Arduinos is driving two servos. The question or problem is that my servo is shaking ...
2
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2answers
160 views

On Computing Power Consumption for a GSM system

I'm a software student trying to learn about embedded systems. I would like to build a low-power system that can send his coordinates by SMS and also receive SMS. Unfortunately I'm at level zero in ...
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2answers
430 views

Wavelengths blocked by a certain metal mesh

Introduction: I've heard about a theory, according to which you can check if there is any leakage in your microwave oven by putting your mobile phone inside and call it. However, I gave it a try and ...
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1answer
168 views

How to provide enough current for my GSM circuit, and still use a LiOn battery?

I am very new to electronics. I am building a simple GPS tracker prototype circuit that uses a 3.7 volt 500mah lithium ion rechargeable battery. The circuit has 2 major components: a simple ...
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2answers
164 views

SIM908 POST Request

I want to send a couple of variables to a webpage in my server over the SIM908. Does anyone know how do send such data over POST protocol? I was able to complete the task using GET but currently ...
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164 views

Sim 908 AT command not working

I am working on Sim 908 GSM+GPS module. I wanted to see if it works perfectly with the PC so I connected the module with the PC and ran Realterm (a terminal software). After a lot of tries of entering ...