GB616369A - Radio direction finder - Google Patents

Abstract

616,369. Radio direction finding. SPAN DARD TELEPHONES & CABLES, Ltd. May 31, 1946, No. 16623. Convention date, June 27, 1945. [Class 40 (vii)] A radio direction-finder for use in the reception of single pulses comprises a plurality of differently directed aerials 1, 2, 3, 4, the outputs from which are applied respectively through the delay units 14, 15, 16, 17. each of which has a different delay time, to the receiver 13 so that upon the reception of a single pulse a train of pulses of different amplitudes is applied to the receiver. The aerials which are rendered unidirectional by mounting reflecting shields behind them are so arranged that a signal received from any direction energizes at least one, but not more than two of the aerials. An omnidirectional aerial is also provided. the undelayed output from this aerial being used to trigger the circuit 21 which generates the linear time-base of the cathode-ray tube indicator and to apply a brightening pulse to the grid 26 of the tube when a signal is received. The signals received by the directional aerials are consequently displayed in succession on the cathode-ray tube trace, their relative amplitudes being indicative of the direction of reception. The Specification as open to inspection under Sect. 91 describes a system comprising an aerial system as previously described so that a train of pulses is delivered for each pulse received, wherein means are provided at the receiver for directing the pulses of each train into different channels corresponding to the appropriate receiving aerial, these channels being connected to separate plates of a cathoderay tube so that the direction of deflection of the spot corresponds to the direction of reception of the pulse signal. This subjectmatter does not appear in the Specification as accepted.