GB228616A - Improvements in wireless receiving apparatus - Google Patents

Abstract

228,616. Johnston, F. R. Nov. G, 1923. Receiving sets, construction of; aerials. - A receiving set in the form of a unit adapted to be positioned with the headphones on a person's head comprises an aerial a, detector p, and one or more tuning devices k, k<1>, k<2>. Fig. 1 shows the construction and Fig. 3 the circuit. Housings g, h are provided for the tuning coils k, k<1>, k<2> and detector respectively, and a stud on one of the earpieces contacting with the wearer's body is connected to telephone terminal n<1> as earth connection. Condenser b comprises insulafed plates, alternately connected, opening and closing concertina fashion under the control of a screw j. The coils k<1>, k<2> are provided with operating knobs l moving in longitudinal slots in the casing g, and nuts may be provided to lock them in their adjusted positions. In a modification, the aerial wire is wound in sections on the formers a<1>, a<2>, and a loop may be arranged outside the casing to hang by the side of the wearer. The Provisional Specification states that the detector and tuning devices may be mounted on the earpieces, and that the aerial may be supported from the headband by miniature masts.