The setting up and operating a Radio Amateur portable station. This was at Middlefield Trig pillar and was to talk to other amateurs on the Worked all Britain net on 7.160MHz
See [ Ссылка ] for details of the WAB group

A kmz file for Google Earth : [ Ссылка ]

A brief explanation of trigpoints: [ Ссылка ]
Ordnance Survey excellent reading:
[ Ссылка ]
[ Ссылка ]

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