GB470060A - Improvements in or relating to goniometer navigation aiding and like radio receiving installations - Google Patents

Abstract

470,060. Directive wireless signalling. SOC. FRANCAISE RADIO-ELECTRIQUE. Dec. 30, 1936, No. 35752. Convention date, Dec. 30, 1935. [Class 40 (v)] A direct-reading radiogoniometer comprises a vertical aerial A, Fig. 1, and two fixed frames C, C1, set at right-angles, the signal voltage from the latter being periodically reversed, or suppressed, by a pair of diodes V1, V2, shunted across the tuned circuits CV1, CV2. The diodes are energized in phase-quadrature at U, U1 from a two-phase alternator, and give the same effect as if the frames were rotating. After passing through amplifiers E1, E2, the frame voltages are combined with the pick-up from the aerial A in a common circuit CV3, which is coupled at G to further amplifiers feeding a phase indicator. The effect of the diodes is to damp the circuits CV1, CV2 alternately, and thus cut down or suppress the energy passed to the amplifiers through first one and then the other of the two coupling condensers C2. Fig. 2 shows an alternative method of coupling the aerials to the common combining circuit, and of reversing or suppressing the frame voltages so as to give the effect of constant rotation. A pair of diodes V1, V1 and V2, V2 are inserted in series with each of the two transformer secondaries, the two sections of which are wound in opposite directions. One or other of the diodes is put out of action as its cathode is thrown positive by the low-frequency voltage developed across the windings U1, U2. Both frames are coupled to the same tuned circuit CV3. In another modification, each of the transformers has five windings, one of these forming part of the common tuned circuit.