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Ambient Wood Workshop
Radio Frequency Survey and Mapping
On this page we describe the results of a brief survey of radio frequency reception in the 'ambient' woods. In particular GPS readings were successfully taken and used to produce a rough mapping grid for the woods (see below). A Garmin eTrex Venture was used to take these readings.
|The extent of 2.4 GHz 802.11 coverage was explored from a single 8dB antenna mounted approximately
three metres above the ground. Signals were monitored by a Symbol CF card in a Jornada 568.
n.b. PCMCIA 802.11 cards usually give a marginally better performance.
|A dGPS signal was also satisfactorily received from St Catherines on the Isle of Wight (307.5kHz).|
GPRS coverage was also established using Jornada 568/Bluetooth/Ericsson T39m/Orange. The service was at best intermittent during the test period - it certainly could not be relied upon.
The pink curve shows Henk's initial walk from the eastern edge of the clearing to the ponds (B07, A07, C07, D07).
The 802.11 data is shown in yellow. The range to the west, south and east is indicated by the light shading (tx:016, range 007-015).
From the above readings an approximate grid can be derived as shown below :-
n.b. figures are minutes from 50deg N. 0deg E.