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Antenna Terms ExplainedCommon antenna terms, gain, decibels, ground plane independent, omni directional explained.Antenna Terms Explained (file size=94kb)andAntenna 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)Cinterion Module and Terminal Specifications: This PDF file compares Cinterion (Siemens) Modules and Terminals in an easy to use table format. Full specifications for the Cinterion (Siemens) modules, EES3, EGS5, EGS3, BGS3, MC75i, TC65i, TC63i, MC55i, BG2, BGS2, HC28, HC28-J, HC25, EU3, PH8, AGS3, AC75i, AC65i, XT65, XT75 and Terminals, TC65T, MC52iT and MC55iT. Cinterion (Siemens) Module and Terminal Specifications:(file size=81kb)Sierra Wireless Airlink Product Comparison: This PDF file compares Sierra Wireless Airlink Routers in an easy to use table format. Full specifications for the Sierra Wireless Airlink Routers, GX400, MP597, MP890, MP895, Pinpoint X, Pinpoint XT, Raven X, Raven XE, Raven XT and Helix RT. Sierra Wireless Airlink Comparison Chart:(file size=442kb)Siemens GPRS Startup Guide, v0400: This PDF file describes how to set up a PPP connection with Microsoft Windows 2000 using any Cinterion (Siemens) GPRS engine. Configurations and settings for other operating systems (Windows XP) may differ slightly, but the general concept is similar.Cinterion (Siemens) GPRS Startup Procedure:(file size=792kb) |
GSM Signal AnalyserA must for engineers and professionals who need to check cellular signal strength in both CSQ and Dbm. The big advantage is that it works without an airtime sim card. Simply program in the Cellular providers Netid numbers. As it is quad band it works worldwide. Readings can be downloaded to a PC for analysis, if required. Supplied with AC adapter, cigar lead, carrying case, rubber antenna and RF adapter FME/SMA.Link to GSM Signal Analyser:Support related questions or comments:By Email to John Andrew:support@gprsmodems.co.uk |
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