07-02-1947 дата публикации
Номер: GB0000585473A
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... 585,473. Valve receiving circuits. STANDARD TELEPHONES & CABLES, Ltd., and WILLOUGHBY, E. O. Aug. 1, 1944, No. 14700. [Class 40 (v)] In a radio distance determining arrangement depending on the frequency sweep principle, a leaky grid detector for determining the frequency difference between the outgoing and incoming signal, has its grid effectively earthed at high frequencies and the two signals rare fed onto the cathode circuit ; thereby ensuring a low input impedance at high frequencies, :at which the anode circuit comprises a low impedance byepass circuit, while presenting a high impedance at the detector signal frequency. The detector valve 1, Fig. 1, which is of the grid disc type as disclosed in Specifications 585,448, 585,449, 585,450, 585,452 and 585,454 is mounted in a screening case ; whose parts 8, 9 of different diameters are connected by the apertured disc 10 'whose capacity 11 with the grid disc 5 effectively earths the grid at signal frequencies. The two frequencies whose ...
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