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Questions tagged [gsm]

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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RF power transmission control in U-blox GSM modules

I am using the SARA-U270 GSM module and want to test energy-saving techniques. One technique I would like to try is power transmission control, adjusting the transmission power in dBm based on the ...
Aleat's user avatar
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14 votes
2 answers
5k views

Which signals (Wi-Fi, mobile phone, and GPS) can reliably be blocked by aluminum foil?

There seems to be conflicting information regarding which signals can be effectively blocked by wrapping the device in aluminum foil. With effectively blocked I mean block the signal as such that the ...
CuriousIndeed's user avatar
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GSM and LTE-M connection with SIM7070G for MQTT data transmission

I am working on a tracker project using the SIM7070G modem from SIMCOM. The objective is to maximize the connection by working with both LTE-M and GSM, aiming to send location data via MQTT. I have ...
Santiago Mercante's user avatar
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264 views

Sim800L can't send SMS

I know it is somehow weird problem, but I don't know what to do. I am using SIM800L GSM module with ESP8266 nodemsu v3 and they are connected via UART serial communication. I am using this code to ...
Mohamed Essam's user avatar
1 vote
1 answer
29 views

Why Phase1 GSM is mentioned to be a 3GPP release?

In some references such as Wikipedia (although wiki is not a reliable reference), GSM phase 1 is mentioned one of 3GPP releases while 3GPP itself is founded in 1998/1999 while GSM Phase 1 is ...
VSB's user avatar
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SIM800L GSM module humming noise

I am trying to play audio over the call by using SIM800l I am using this "DFPlayer mp3 module" to play audio and connected its AUDIO OUT to the MIC IN of "SIM800L GSM module" and I ...
Mohamed Essam's user avatar
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0 answers
192 views

Can't get DTMF tones from sim800L gsm module

I am using esp8266 and sim800L gsm module to recieve incoming call and get the DTMF tones from the caller and take an action according to the received number, i am searching for about 3 days and found ...
Mohamed Essam's user avatar
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94 views

SIM800C not working as expected

I've created a custom board with a SIM800C. I'll show the schematic above: My VIN is aproximately 4.8V. MY "4V" line is constant. I'm able to comunicate with the module, but sometime's ...
ANTONIO EMILIO PEREIRA's user avatar
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42 views

Powering 4V, 2A GSM/GPRS module

I am currently working on a project that involves powering a Quectel GPRS/GSM module, which requires a current of 2A at a voltage of 4V. I intend to power the module using a 5V adapter and a lithium ...
rs04's user avatar
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1 answer
352 views

Sending/receiving a continuous stream of data using SIM7600

I have a SIM7600EI connected to an STM32 controller over UART. I am able to send HTTP POST requests for small chunks of data using AT commands. Currently, I want to send a continuous stream of data ...
nottherealfaraday's user avatar
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Different GPS antennas not working properly on my GPS module

I have a SIM808 based board. It is working fine with an antenna similar to this: enter image description here Now I want a smaller one; I bought 3 from Amazon for testing. The same voltage, frequency ...
Cherif Dekari's user avatar
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2 answers
445 views

SIM800L external supply issue

I have built an Arduino project that sends data from sensors to a specific website using the SIM800L GSM module. My problem is when I power whole circuit it from a computer or a charger, it works fine....
electronix0's user avatar
3 votes
2 answers
1k views

How did old mobile phones amplify signals lower than the noise floor?

In the early days of GSM in around 2000 when the network was still not fully deployed, it was common for me to receive very low signal, even sometimes No Signal due to out of network. I used to use a ...
AirCraft Lover's user avatar
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0 answers
41 views

Identify this component: BEF1592 2143

This component is placed in the signal path next to a multi-band GSM antenna. It seems to have 3 terminals - 1x GND and 2x in signal path. I suspect it is some sort of bandpass filter, but can't ...
Kripacharys's user avatar
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76 views

I hear noise after turning SIM7600 on

I have a question about the GSM 7600g-h module which I am currently using to send data by TCP (Transmission Control Protocol) . The problem with using that kind of GSM I bought is the noise after ...
Tumenbayar Munkhjargal's user avatar
1 vote
0 answers
50 views

SD Card Write Problem

In my project I download a ".hex" file from FTP via GSM connection and write it to a SD card. But I have a problem: I download file and all loops work well but when I access the file on ...
Mehmet Günce Akkoyun's user avatar
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1 answer
414 views

GSM Operator Register problem (CREG:3 Error)

I am using Turkcell operator (2G) in my application (28601). GSM Modem: Telit / GE910QUAD. I use the AT sequence listed below: ...
Mehmet Günce Akkoyun's user avatar
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1 answer
163 views

How to connect GSM module and Arduino to the same battery?

I am using SIM800L which requires voltage range between 3.4-4.7 V with 2 Amperes. On the other hand Arduino Uno requires 7-12 V. The question is how to power both of them with the same Lithium battery?...
Ziad Montaser's user avatar
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0 answers
137 views

Why does the SIM800C stop sending data to the server after three days of continuous use?

I created a device that monitors air quality. The measured data is then sent to a web server using an ESP32 (programmed in C++ with Arduino framework) and SIM800C module, which stores them in an ...
BelKed's user avatar
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1 vote
1 answer
75 views

Bad GSM network automated testing

We are using a 2G modem controlled by an MCU in our device and we want to do an automated test routine that tests our firmware for bad mobile network scenario. How can we create a system where a ...
EarthLord's user avatar
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C8051F020 serial communication with GSM module (SIM900)

I am currently trying to interface the GSM900 module with a C8051F020 microcontroller using serial communication in order to send AT commands to the GSM from the 8051. The TX of the microcontroller is ...
Lesego Gareseitse's user avatar
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0 answers
61 views

How to correctly model a receiving antenna?

I want to amplify the signal received by an antenna for GSM signals. I am currently modeling the antenna as a 900 MHz sinewave generator and a 50 Ω resistance in series with it. However, I doubt this ...
td211's user avatar
  • 107
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0 answers
47 views

Difference of Milenage Version 1 and Version 2

I've heard in the telecom industry about Milenage Version 1 algorithm and Milenage Version 2 algorithm. I want to know what are their differences? The version 1 and version 2 have the same length for ...
VSB's user avatar
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1 vote
4 answers
109 views

Can I determine antenna band without very expensive equipment and knowing antenna length?

I have a lot of GSM and WiFi antennas of various lengths and shapes with SMA connector. I know of the antenna length relation with wavelength, but in some cases it is difficult or impossible to ...
Kamil's user avatar
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1 vote
0 answers
40 views

A6 SIM module keeps resetting

I'm using a SIM A6 module (Goouuu Tech A6, I believe it's the same) to send messages. The problem is, once I plug in a SIM card, it keeps resetting (the green led blinks and kind of interrupts after 3-...
Bogdan Bogdan's user avatar
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1 answer
356 views

GSM module SIM800C 4V power supply efficiency of circuit

This is a follow-up question to https://electronics.stackexchange.com/a/436720/208059 I (SE not EE) am designing a circuit for a battery-operated IoT node. Power consumption is critical so the GSM ...
Insa's user avatar
  • 103
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0 answers
66 views

Gsm switch to turn individual lights on

looking for some more help. I now have my led consumption sussed but have run into another obstacle which I require some help with. I have 8 x individual lights which I have decided can be turned on ...
Russell's user avatar
  • 35
1 vote
1 answer
271 views

SIM800L power switching with transistor

I use a TIP32C transistor to switch the power line of a SIM800L module, but unfortunately this method isn't working. The module is powered on, but it only blinks once every second instead of every 3s. ...
DJDB999's user avatar
  • 77
5 votes
1 answer
640 views

Impedence matching required for very short PCB trace?

I have a custom PCB using 50 ohm impedance antennas for GPS (1.575 GHz), GSM (2.4 GHz), and LoRa (868 MHz). Currently using an impedance matched board with matching track widths of 6 mil. One track ...
Scott Porter's user avatar
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1 answer
357 views

Anyone having a GSM module please confirm. Is it normal to have the terminals of SIM800L EVB antenna shorted?

My SIM800L-EVB GSM module wasn't registering to network even after providing good power supplies. On troubleshooting I found that the terminals A and B, to which the antenna attaches(see img attached) ...
Rishab Navaneet's user avatar
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1 answer
81 views

180m to proper 4G reception: which approach to take to ensure good bandwidth?

I have a cabin in a remote location in Norway, and as luck has it, no cell phone reception. There is great reception up on a hill nearby. I could erect an antenna there, and the cable would be about ...
oligofren's user avatar
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0 answers
146 views

SIM808 not supporting SSL related commands

I am using SIM808 module. It's working fine with normal MQTT over TCP. But it's not working while implementing secured MQTT. I am sending this command (AT+SSLSETROOT="C:\USER\HENRY_SSL.CRT")...
mohamed ali's user avatar
2 votes
0 answers
436 views

Would it be possible to use a GSM without a SIM card?

I would like to reduce the footprint of my PCB (a simple IOT GSM impl.). Given a common GSM such as SIM800/868/900l etc. Would it be possible to completely replace the footprint of a SIM card holder (...
Axiom Lemma's user avatar
0 votes
0 answers
356 views

Problem Understanding how to use Li-Ion battery charger IC

I want to drive a Load that consumes 2A current during data transmission for a concise amount of time, and it can tolerate a maximum of 4.4 volts (SIM800 Series GSM). It works fine with a DC adapter ...
Sadat Rafi's user avatar
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1 vote
2 answers
5k views

What does GSM 900/1800 mean?

I was looking at old Nokia 3310 phones, which have GSM 900/1800. I did some research online from a government website, along with some Google searches, to understand what GSM 900/1800 means. I got a ...
questioner's user avatar
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0 answers
61 views

Battery for GPRS module and voltage regulation

I work on a wearable GSM device powered with a LiPo battery. I want to use a switching charger with a power path. My GSM module can consume up to 2 amps during data transmission and its working ...
Denis Jelesniak's user avatar
1 vote
2 answers
553 views

Ground plane for a GSM spring antenna with 4 layer PCB

We are looking to build a 2G GSM based device with a helical spring antenna like this. The work in progress layout is as shown below: We are using a 4 layer PCB with top layer for signal, inner 1 ...
EarthLord's user avatar
  • 597
0 votes
1 answer
73 views

Problem in capacitor selection

The SIM800L datasheet suggesting a low ESR capacitor for providing a 2 ampere burst current during data transmission. According to this site MLCC provides the lowest ESR at high-frequency application, ...
Sadat Rafi's user avatar
  • 2,519
-1 votes
1 answer
192 views

How can I program my mcu stm32f103 to transmit and receive data via a server [closed]

hello I am a beginner and my final project is an alarm system, in fact I use a mcu stm32f103 and I want to transmit the data by a GSM module to a base (to access it by a mobile application) and also ...
ss_yh's user avatar
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0 votes
1 answer
206 views

Are there regional constraints with the SIMCom modules? (Eg. SIM7605CE/SIM7600CE)

I recently received a SIMCom Module (Model no. SIM7605CE), shown below. The item can be (purchased online as well). The device, much like the ones used with Arduinos (like the SIM800L), is supposed ...
C Vith's user avatar
  • 15
0 votes
1 answer
152 views

Capacitor for reducing voltage drops

I use gsm module, which makes current bursts up to 2Amps (maybe slightly more). That causes voltage drops about 0.5V on my power supply (I use lipo battery), and than device hangs up or starts ...
Denis Jelesniak's user avatar
0 votes
1 answer
101 views

An effective way to knock down GSM on demand

I am building a test rig for a device that has a GSM module to communicate and I want to test how the FW behaves when there is a comms loss and recovery. The GSM module of the device has an antenna ...
Tomari's user avatar
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0 votes
1 answer
101 views

Arduino : send data via satellite (or other solutions) without GSM [closed]

I'm a researcher. I'm looking to build a very tiny embedded system with low power consumption. I must send data from the desert and above the ocean. To do that I think that my single option is to use ...
Artex's user avatar
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0 votes
0 answers
261 views

Bluetooth antenna problem with SIM800C on my board

I have designed a board with a SIM800C and I have followed all details with its given datasheet. Everything is working well except the Bluetooth that gives very low antenna strength (less than 10cm.) ...
Saeed Saeedvand's user avatar
0 votes
1 answer
800 views

Is GSM full-duplex?

GSM uses FDD (frequency division duplexing) and provides separate channels for uplink and downlink. I found however, in this link, that the mobile station does not receive and transmit at the same ...
NickG's user avatar
  • 391
1 vote
1 answer
121 views

Are there any special considerations for extending a UHF-carrying coax wire in a small device?

In the process of doing a repair on a mobile phone, I've tracked down a "no service" issue to an antenna lead inside the case. Specifically, it has detached from the U.FL/MMCX (I'm not sure ...
Mikey T.K.'s user avatar
1 vote
2 answers
1k views

PCB antenna track and SMA connector controlled impedance

I designed a pcb for GSM module, using all the specifications given by the manufacturer, to have a controlled impedance. But there is a small detail that escapes me and that is not documented. When ...
ikt's user avatar
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0 votes
0 answers
166 views

Need help with power supply circuit

i'm currently designing a device which uses GSM module. which works on 12V and if the main supply is not there, it will run on battery. right now i'm facing a problem in power supply circuit. i'm ...
Paul Canon's user avatar
0 votes
0 answers
229 views

Tracking location with GSM tower triangulation

I want to track location with GSM tower triangulation. I searched and I found this API for GSM positioning. ...
Sun's user avatar
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1 vote
0 answers
26 views

design considerations of Ethernet-spi controller

Recently I have designed board on which Ethernet and gsm module need to be placed. Already I have exported Ethernet related chip to pcb and arranged in this order s shown in below image This is how I ...
SHIVA KUMAR's user avatar

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