K Crystal Detector

K  Crystal Detector.

A simple form of plug-in crystal detector differing in design from the galena type which is now so generally adopted.

The crystal itself is probably an artificial product, for it completely fills the cup into which it is fitted, whilst the surface is rubbed down to be quite flat. ‘The pressure exerted by the wire contact is maintained by a coiled spring, the contact point passing through a small eye in a brass guide piece which holds it in place and prevents it from becoming bent as it travels over the face of the crystal. Both the adjusting knob and the outside of the container are provided with milled edges, the former controlling the rotation of the wire contact on the crystal surface and the latter by means of an eccentric mounting searching the surface of the crystal.

An unusual feature is that no provision is made for adjusting the pressure of contact, thus simplifying the operation of the detector.

On test, the detector was found to be easy to set and quite sensitive, and judging by its effect on the tuned circuit one may conclude that the resistance of the contact is higher than that of most galena detectors.
The manufacturers recommend this detector for use in reflex circuits.

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