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Ambient Wood Workshop

Radio Frequency Survey and Mapping

May 2002

 

Soton pages

Aerial photograph from MultiMap.

blubells.jpg (67600 bytes)

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.

 

mast.jpg (36111 bytes)

A dGPS signal was also satisfactorily received from St Catherines on the Isle of Wight (307.5kHz).

dgps.jpg (50931 bytes)

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.


Henk's walks in the woods :-

Lat

Lon

50deg N. 0deg E.
 
Walk

B07

54.808

7.458

A07

54.797

7.380

C07

54.763

7.328

D07

54.745

7.326

   
802.11    
Tx

016

54.802

7.374

Range

007

54.784

7.342

008

54.764

7.355

009

54.764

7.372

010

54.764

7.408

011

54.771

7.442

012

54.788

7.442

013

54.803

7.430

014

54.811

7.432

015

54.830

7.460

henkwlk5.jpg (62524 bytes)

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 :-

aw_grid.jpg (65459 bytes)
n.b. figures are minutes from 50deg N. 0deg E.


This page last updated May 20, 2002
The material displayed is provided 'as is'. Contents may not be reused without prior permission.
For problems or questions regarding this web contact Cliff Randell.