MARCONI XG189 GONIOMETER USED FOR RF SIGNAL DIRECTION FINDING

[AA8*B]
£12.00
MARCONI XG189 GONIOMETER
MARCONI XG189 GONIOMETER USED FOR RF SIGNAL DIRECTION FINDING aa8*b

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We've had these years wondering what they were...Now we have found out !

Manufactured by Marconi's Wireless Telegraph Co London in the 1950' we think, they are a Goniometer, used in naval RF direction finders. If you google Marconi XG189 and Goniometer you will see quite a lot of interesting info.

A goniometer consists of 4 small coils arranged in quadrants in a cylinder, very much like the field windings of a car starter motor, but in miniature. The inner ends of the windings are all joined together as a common point, the outer ends are available for the connection via coaxial cable to either an Adcock array or to the ends of a pair of loops mounted at 90 degrees (Bellini-Tosi). The four input terminals will be marked NSEW or For and Aft, Port and Starboard. The output pair go to the receiver. These devices are quite small (1" diameter, 2" long and completely screened), often containing ferrite or manganese/zinc cores, and in the case of the XG189 (Marconi) is used for marine DF.

The ones we offer for sale here were removed from ministry of defence radio test equipment, they are the Marconi XG189, and they are roughly 60mm long plus the shaft and 28mm diameter.

The shaft is I guess 1/8th inch - about 3mm, with a very nice clamp-on shaft extender and adaptor which takes it upto 1/4" - about 6mm, and 40mm in length.

There are 6 terminal marked ABCDEFE, we think a - d are NSEW (as per above) and F and E are the output.

The Goniometer is enclosed in an aluminium screening can, as per the photographs.