Marconi Direction
Finding equipment in WW-1
Early
Direction Finding (D/F) equipment using “soft electronic valves” and a
Bellini-Tosi directional system was secretly developed by the Marconi Company
in Chemsford just before WW-1, and stations were set up during the war across
the British Isles and the Western Front. The purpose was to obtain information
regarding the location of Zeppelins and submarines by detecting the radio
frequency transmissions that they made. Direction Finding played a crucial role
in the outcome of WW-1. A tent was used to house the Marconi Direction Finding
Equipment to detect Zeppelins. This photograph was taken in 1916...
The
first wartime direction-finding stations were tested in 1915, and weekly maps
based on D/F information were drawn for Military Intelligence. Initially, these
showed German wireless positions; soon they would also indicate movement of
trench wireless units and therefore troops, of Zeppelin dirigibles and other
enemy aircraft. The equipment picked up both the signals from radio
transmitters and noise generated by the coil and spark plugs of engines to
provide early warning position and direction information, but as the enemy
realised the need to minimise radio transmissions and fit ignition noise suppressors
to the engines their usefulness dwindled.
Initially
the D/F installations were carried on horse-drawn wagons and set up in tents, but
the Marconi Company developed portable sets housed in automobile trucks. By
1916 a large number of secret stations which utilised the equipment were in
use. By 1916 the coastlines of Britain were covered by a network of Direction
Finding stations. As the Stow Maries and Goldhanger flight stations were the
nearest Zeppelin chasing stations to Maconi’s research establishment at Chelmsford
they would have been closely involved with this very secret activity.
A BT phone card produced to commemorate Marconi’s
centenary
L48 was shot down by flying Officer L.P. Watkins after
taking off from Goldhanger
Goldhanger
Flight Station The Great War Home