Technical Topics and Downloads: A reference section for developers and engineers. Antenna Terms Explained Common antenna terms, gain, decibels, ground plane independent, omni directional explained. Antenna Terms Explained (file size=94kb) and Antenna Gain explained by RFI (file size=144kb) Phasing Yagi Antennas Yagi antennas may be phased in either horizontal or vertical polarisation. When correctly installed gain may be boosted by 3db (for two antennas) and 6db (for four antennas) over the gain of a single antenna. Phasing Yagi Antennas Explained.(file size=177kb) AT+CSQ (Signal Quality Measurement) With data calls signal strength is important, particularly in regard to GPRS connections. AT+CSQ command returns the Signal Quality Measure (SQM). This is a Signal to Noise Ratio measurement that is used to ascertain the relative quality of the received cellular signal. There is no standard in regard to this measurement, other than most manufacturers report CSQ'S between 0 and 31. To have a reliable GPRS connection a minimum CSQ value of 20 is recommended. To convert the CSQ to a Received Strength Signal (RSSI) or dBm value, you must assume a noiseless environment. The dBm figure may be worked out using the formula: dBm = -113 +n x 2, where n is the CSQ. For example a CSQ of 20 would equate to a dBm of -73. The lower the dBM reading the better.Preferred values for GPRS connections would be dBm readings within the 50 range. A table is enclosed which visually shows dBm readings for different values of CSQ. Table representation of CSQ and dBm.(file size=15kb) Siemens Module and Terminal Specifications: This PDF file compares Siemens Modules and Terminals in an easy to use table format. Full specifications for the Siemens MC75 EDGE modem, XT55 Tracking modem, AC75 / AC45 Rugged Modems, TC63 / TC65 / MC55 / MC56 / MC39i / TC39i Modules and TC65T / MC35iT / TC35iT Terminals. Siemens Module and Terminal Specifications:(file size=389kb) Siemens GPRS Startup Guide, v0400: This PDF file describes how to set up a PPP connection with Microsoft Windows 2000 using any Siemens GPRS engine. Configurations and settings for other operating systems (Windows XP) may differ slightly, but the general concept is similar. Siemens GPRS Startup Procedure:(file size=792kb) Siemens Module and Terminal Connection Guide: Development and Connection Guide for Siemens TC35i, MC39i, MC55/56, XT55, XT65, XT75, TC63, TC65, MC75, HC15 Modules and TC35iT, MC35iT and TC65iT Terminals. Siemens Module and Terminal Development Connection Guide:(file size=653kb) Open AT Software:  Five main components make up the Open AT software suite: (1) Open AT IDE's in PDF format ( file size 619Kb.). - PC based development tools for creating embedded ANSI C applications:
- Open AT built on Eclipse for native embedded client design
- Open AT GTI for native display driven HMI design
- M2M Power for rapid scripting
(2) Open AT Applications - Sample code, application notes and reference designs.
(3) Open AT Plug - Ins, in PDF format ( file size 756Kb.). - Value added functionality such as Internet, Companion GPS and Bluetooth, IBM MQTT for Websphere and Orange M2M Connect.
(4) Open AT Operating Systems, in PDF format ( file size 732Kb.). - Real Time OS providing native application execution framework, numerous API's, DOTA and power consumption control.
(5) Open AT Firmware - Open AT enables developers to natively execute standard ANSI C software applications on Wavecom Wireless CPU's.
Open AT Application execution is supported by default on the following Wireless CPU's. - Wavecom Fastrack M1306B and Wavecom Integra Plug and Play Series.
- Q2686 and Q2687 Modules, Existing Q24 GSM Series,New Q24 GSM Series and Q2501 Quik Series.
- WMP100 and WMP150 Wireless Microprocessor's
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