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The Neptun mine detector (fig. 159) is a heterodyne type. It was one of
the earliest detectors of this type to be developed by the Germans. The
set is characterized by a 6-foot 10-inch aluminum extension handle with a
pivoted, circular, ring-shaped search head. The oscillator circuits are
housed in an aluminum case attached to the extension handle. During
operation, the detector is carried by a web strap worn over the shoulder.
As is characteristic of most heterodyne detectors, this detector has good
sensitivity to large metallic objects and poor sensitivity metallic
objects.
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