Antenna efficiency
The efficiency of an antenna relates the power transited from M2M module to the antenna and the power radiated or dissipated within the antenna. A high efficiency antenna has most of the power present at the antenna’s input radiated away. A low efficiency antenna has most of the power absorbed as losses within the antenna. [...]
PTRCB Over-the-Air Test
For cellular applications such as GSM or CDMA basic RF performance is measured in terms of the product being able to transmit and receive reliably on a network. The scientific way to measure performance is in an anechoic chamber.
PTCRB approval
GSM and 3G M2M applications supporting North American 2G/3G networks require PTCRB approval (PTCRB Type Certification Review Board) in order to be accepted by the network operators in US and Canada. PTCRB approval ensures a M2M device is compliant with the appropriate technological standards, regulatory requirements and certain operator requirements (e.g. Over-the-Air RF performance).
3G module with embedded GPS
3G module with embedded GPS http://ow.ly/1zDix
a2a_config.linkname=”3G module with embedded GPS”;
a2a_config.linkurl=”http://www.gsm-modem.de/M2M/m2m-faq/3g-module-with-embedded-gps-ht/”;
a2a.init(”page”);
Symbian OS in M2M
We all know Symbian as an operating system for Nokia mobile phones. Symbian is driving the 3G modem listed at http://www.gsm-modem.de/umts-modem.html . Symbian is able to drive the pin compatible 2G and CDMA modem as well. All this is possible because Telit´s 864 family is pin compatible.
Video: An Introduction to the Symbian System Model
a2a_config.linkname=”Symbian [...]
Indoor locating without GPS. Summary of technologies
Today we offer a summary of indoor locating technologies.
1. Indoor positioning on Bluetooth
http://www.gsm-modem.de/M2M/tweet/indoor-positioning-on-bluettooth/
2. WIFI 802.11b is use to detect change in position of one meter or even less
http://www.gsm-modem.de/M2M/tweet/m2m-lbs-indoor-locating-w/
3. Indoor Navigation without GPS: The new gold rush?
http://www.gsm-modem.de/M2M/m2m-news/indoor-navigation-without-gps-the-new-gold-rush/
4. Batman´s technology in use to see trough walls. Will Gotham City come true? Is [...]
DTMF decoding by GSM modem
DTMF decoding by GSM modem http://ow.ly/1gZU6
a2a_config.linkname=”DTMF decoding by GSM modem”;
a2a_config.linkurl=”http://www.gsm-modem.de/M2M/m2m-faq/dtmf-decoding-by-gsm-modem/”;
a2a.init(”page”);
GSM Audio Codec & DTMF. Why the Half Rate Codec could force trouble?
The DTMF signal is generated by a separated source, typically a landline (corded) phone, and sent to the input lines of the module (Uplink path). The frequencies couples, sent on the voice channel , are digitised, encoded and sent by the digital transmission system. In the receiving device the signal would be reconstructed, but since [...]
GSM module located by Timing advance
GSM module located by Timing advance TA. Example on TA combined with Angle of Arrival and analysing sector antennas http://ow.ly/14y7U
13.03.2010 Remark of the author after sending the tweet:
I am working on a GSM based locating system that will cover 180 countries. The first GSM based locating I launched 10 years ago at World Trade [...]
Approval RTT&E EN 301489-1, EN 301489-7 & EN 301511
Approval RTT&E EN 301489-1, EN 301489-7 & EN 301511. Why to pay € 11437 if you can get it for € 4400 us well?
Region
Specification
Euro
Euro
Euro
Europe
R&TTE Directive Article 3.1(b)
EMC testing for a dualband GSM terminal device
EN 301 489-1 & EN 301 489 -7
4000
2000
6500
Europe
R&TTE Directive Article 3.2 (Spectrum Usage)
Radio testing, radiated spurious emissions measurement in GSM [...]
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